Panasonic Kx Ft21rs User Manual

ORDER NO. KM79911336C3

PARSONAL FACSIMILE

KX-FT21RS

(Russia)

rights reserved. Unauthorized copying and

distribution is a violation of law.

KX-FT21RS

1 INTRODUCTION

1.1. SAFETY PRECAUTIONS

1. Before servicing, unplug the AC power cord to prevent an electric shock.

2. When replacing parts, use only the manufacturer´s recommended components.

3. Check the condition of the power cord. Replace if wear or damage is evident.

4. After servicing, be sure to restore the lead dress, insulation barriers, insulation papers, shields, etc.

5. Before returning the serviced equipment to the customer, be sure to perform the following insulation resistance test to prevent

the customer from being exposed to shock hazards.

1.2. INSULATION RESISTANCE TEST

1. Unplug the power cord and short the two prongs of the plug with a jumper wire.

2. Turn on the power switch.

3. Measure the resistance value with an ohmmeter between the jumpered AC plug and each exposed metal cabinet part (screw

heads, control shafts, bottom frame, etc.).

Note: Some exposed parts may be isolated from the chassis by design. These will read infinity.

4. If the measurement is outside the specified limits, there is a possibility of a shock hazard.

The equipment should be repaired and rechecked before it is returned to the customer.

1.3. FOR SERVICE TECHNICIANS

ICs and LSIs are vulnerable to static electricity.

When repairing, the following precautions will help prevent recurring malfunctions.

1. Cover the plastic part´s boxes with aluminum foil.

2. Ground the soldering irons.

3. Use a conductive mat on the worktable.

4. Do not touch the IC or LSI pins with bare fingers.

1.4. BATTERY CAUTION

CAUTION

Danger of explosion if battery is incorrectly replaced.

Replace only with the same or equivalent type recommended by the manufacture. Dispose of used batteries according to the

manufacturer´s instructions.

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1.5. AC CAUTION

For safety, before closing the lower cabinet, please make sure of the following precautions.

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1.6. PERSONAL SAFETY PRECAUTIONS

1.6.1.

MOVING SECTIONS OF THE UNIT

Be careful not to let your hair, clothes, fingers, accessories, etc., become caught in any moving sections of the unit.

The moving sections of the unit are the rollers and a gear. There is a separation roller and a document feed roller which are rotated

by the document feed motor. A gear rotates the two rollers. Be careful not to touch them with your hands, especially when the unit

is operating.

1.6.2.

LIVE ELECTRICAL SECTIONS

All the electrical sections of the unit supplied with AC power by the AC power cord are live.

Never disassemble the unit for service with the AC power supply plugged in.

(Bottom view)

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1.7. FEATURES

General

· Desktop type

· LCD (Liquid Crystal Display) readout

· Help function

· Copier function

Facsimile

· Space Saving Compact Design

· Resolution: standard/fine/super fine/halftone

· Copier Function

· Automatic Document Feeder (10 Sheets)

· Help Printout

· Easy-to-view LCD (15 Characters)

Integrated telephone system

· Electric Volume Control

· On-hook dialing

· Redialing function

· Temporary tone dialing

· Electric telephone directory

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1.8. SPECIFICATIONS

Applicable Lines:

Document Size:

Public Switched Telephone Network

Max. 216 mm (8 1/2”) in width

Max. 600 mm (23 5/8”) in length

208mm (8 3/16”)

216 mm max. 30 m (8 1/2”×98”) roll

208 mm (8 3/16”)

Effective Scanning Width:

Recording Paper Size:

Effective Printing Width:

Transmission Time*:

Approx. 15 s/page (Original mode)**

Approx. 30 s/page (G3 Normal mode)

Horizontal:

Scanning Density:

8 pels/mm (203 pels/inch)

Vertical:

3.85 lines/mm (98 lines/inch)—STANDARD mode

7.7 lines/mm (196 lines/inch)—FINE/HALF TONE mode

15.4 lines/mm (392 lines/inch)—SUPER FINE mode

64-level

Halftone Level:

Scanner Type:

Contact Image Sensor (CIS)

Printer Type:

Thermal Printing

Data Compression System:

Modem Speed:

Operating Environment:

Dimensions (H×W×D):

Mass (Weight):

Modified Huffman (MH), Modified READ (MR)

9,600 / 7,200 / 4,800 / 2,400 bps; Automatic Fallback

5°C—35°C (41°F—95°F), 45 %—85 % RH (Relative Humidity)

122 mm × 338 mm × 240 mm (4 13/16” × 13 5/16” × 9 7/16”)

Approx. 2.5 kg (5.5 lb.)

Power Consumption:

Standby: Approx. 5.5 W

Transmission: Approx. 17 W

Reception: Approx. 30 W (When receiving the CCITT No. 1 Test Chart)

Copy: Approx. 30 W (When copying the CCITT No. 1 Test Chart)

Maximum: Approx. 120 W (When copying a 100 % black document)

220—240 V AC, 50/60 Hz

Power Supply:

* Transmission speed depends upon the contents of the pages, resolution, telephone line conditions and capability of the other

party´s machine.

** The 15 second speed is based upon the CCITT No. 1 Test Chart.

Note:

· Any details given in these instructions are subject to change without notice.

· The pictures and illustrations in these instructions may vary slightly from the actual product.

1.9. OPTIONAL ACCESSORIES

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1.10. CCITT No. 1 TEST CHART

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1.11. LOCATION OF CONTROLS

1.11.1. OVERVIEW

1.11.2. CONTROL PANEL

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1.12. CONNECTIONS

NOTE

When you operate this products, the power outlet should be near the product and easily accessible.

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1.13. INSTALLATION

1.13.1. INSTALLING THE RECORDING PAPER

Open the cover by pressing the cover open button

and install the recording paper roll.

incorrect

correct

Cover open

button

If the paper is secured with glue or tape, cut

approximately 15 cm (6 inches) from the

beginning.

10 cm

Pull the leading edge of the paper approximately

10 cm (4 inches) out of the unit.

Make sure that there is no slack in the

paper roll.

Close the cover securely by pushing down on

both ends.

Tear off the excess paper by pulling it

towards you.

Note:

Only use the included roll of paper or specified recording paper, or else the print quality may be affected and/or excessive

thermal head wear may occur.

For accessory order information.

When the power cord is connected, every time you close the cover a message will be printed. If the recording paper is set to

the wrong side, the message will not be printed. Install the paper correctly.

1.13.2. Document Stacker

Install the document stacker.

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1.13.3. SETTING YOUR LOGO

The logo can be your company, division or name.

Press MENU .

Display: SYSTEM SET UP

Press # , then 0 2 .

YOUR LOGO

Press START/COPY/SET .

LOGO=

STOP

(Delete)

Enter your logo, up to 30 characters, by using

the dial keypad. See the next page for details.

Example: Bill

START/COPY/SET

1. Press 2 twice.

LOGO=B

Cursor

2. Press 4 six times.

LOGO=Bi

3. Press 5 six times.

LOGO=Bil

to move the cursor to the next

space and press 5 six times.

LOGO=Bill

4. Press

To enter the same number key continuously,

move the cursor to the next space.

Press START/COPY/SET .

SETUP ITEM [ ]

Press MENU .

To correct a mistake

To insert a character

Press

to move the cursor to the incorrect

1. Press

to move the cursor to the

character, then make the correction.

position to the right of where you want to

insert the character.

To delete a character

2. Press

(One-Touch Dial key 2) to insert a

space and enter the character.

Move the cursor to the character you want to delete and

press STOP .

Note: Words in blankets ( ) are Spanish. A translated version for each market is available with this

model series.

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1.13.4. To select characters with the dial keypad

Pressing the dial keys will select a character as shown below.

1.13.5. Documents you can send

Note:

Remove clips, staples or other similar fastening objects.

Check that ink, paste or correction fluid has dried.

Do not send the following types of documents. Use copies for fax transmission.

· Chemically treated paper such as carbon or carbonless duplicating paper

· Electrostatically charged paper

· Heavily curled, creased or torn paper

· Paper with a coated surface

· Paper with a faint image

· Paper with printing on the opposite side that can be seen through the front (e.g. newspaper)

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1.14. MAINTENANCE ITEMS AND COMPONENT LOCATIONS

1.14.1. OUTLINE

MAINTENANCE AND REPAIRS ARE PERFORMED USING THE FOLLOWING STEPS.

1. Periodic maintenance

Inspect the equipment periodically and if necessary, clean any contaminated parts.

2. Check for breakdowns

Look for problems and consider how they arose.

If the equipment can be still used, perform copying, self testing or communication testing.

3. Check equipment

Perform copying, self testing and communication testing to determine if the problem originates from the transmitter, receiver or

the telephone line.

4. Determine causes

Determine the causes of equipment problem by troubleshooting.

5. Equipment repairs

Repair or replace the defective parts and take appropriate measures at this stage to ensure that the problem will not recur.

6. Confirm normal operation of the equipment

After completing the repairs, conduct copying, self testing and communication testing to confirm that the equipment operates

normally.

7. Record keeping

Make a record of the measures taken to rectify the problem for future reference.

1.14.2. MAINTENANCE CHECK ITEMS/COMPONENT LOCATIONS

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1.14.2.1. MAINTENANCE LIST

1.14.2.2. MAINTENANCE CYCLE

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1.14.3. MAINTENANCE

1.14.3.1. CLEANING THE DOCUMENT FEEDER UNIT

If misfeeding occurs frequently or if dirty patterns or black bands appear on a copied or transmitted document, clean the document

feeder.

Disconnect the power cord and the telephone

line cord.

Telephone

line code

Open the cover by pressing the cover open button.

Power cord

Clean the document feeder rollers, sub roller and

rubber flap with a cloth moistened with isopropyl

rubbing alcohol, and let all parts dry thoroughly.

Clean the white plate and glass with a soft dry cloth.

Separation roller

Sub roller

Cover

Document

Close the cover securely by pushing down on both

feeder rollers

ends.

Connect the power cord and the telephone line

cord.

Caution:

Do not use paper products, such as paper towels

or tissues, to clean the inside of the unit.

Cover open button

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1.14.3.2. CLEANING THE THERMAL HEAD

If dirty patterns or black bands appear on a copied or received document, clean the thermal head.

Disconnect the power cord and the telephone

line cord.

Thermal head

Open the cover by pressing the cover open button.

Clean the thermal head with a cloth moistened with

isopropyl rubbing alcohol, and let it dry thoroughly.

Close the cover securely by pushing down on both

ends.

Cover open

button

Connect the power cord and the telephone line

cord.

Caution:

Do not push on

the black cover

Caution:

To prevent a malfunction due to static electricity, do not use

a dry cloth and do not touch the thermal head directly with

your fingers.

1.14.3.3. CLEANING THE PICK UP ROLLER........Refer to 4 DISASSEMBLY INSTRUCTION

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2 TROUBLESHOOTING GUIDE

2.1. TROUBLESHOOTING SUMMARY

2.1.1.

TROUBLESHOOTING

After confirming the problem by asking the user, troubleshoot according to the instructions and observe the following precautions.

2.1.2.

PRECAUTIONS

1. If there is a problem with the print quality or the paper feed, first check if the installation space and the print paper meets the

specifications, the paper selection lever/paper thickness lever is set correctly, and the paper is set correctly without any slack.

2. Before troubleshooting, first check that the connectors and cables are connected correctly (not loose).

If the problem occurs randomly, check it very carefully.

3. When connecting the AC power cord with the unit case and checking the operation, exercise utmost care when handling electric

parts in order to avoid electric shocks and short-circuits.

4. After troubleshooting, double check that you have not forgotten any connectors, left any loose screws, etc.

5. Always test to verify that the unit is working normally.

2.1.3.

WHEN YOU DON´T KNOW HOW TO OPERATE THE UNIT, USE THE HELP

FUNCTION

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2.2. USER RECOVERABLE ERRORS

If the unit detects a problem, the following messages will appear on the display.

Note:

The explanations given in the [ ] are for servicemen only.

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2.2.1.

Document Jam

If the unit does not release the document during feeding, remove the jammed document as follows.

Open the cover by pressing the cover open

button.

Remove the jammed document carefully.

Close the cover securely by pushing down

on both ends.

Note:

• Do not pull out the jammed paper forcibly.

before opening the cover.

Cover open button

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2.3. TROUBLESHOOTING DETAILS

2.3.1.

OUTLINE

Troubleshooting guide provides a logical path of deduction to assist in locating a fault and suggests methods of restoring the unit

to full working condition. Use the reported symptoms of the fault to determine the best troubleshooting method. Even difficult faults

can be tracked to a specific block or area, for example, the "Digital Board" or "Image Sensor".

A variety of fault descriptions from customers often point to the same area and, for this reason, careful analysis of the reported

symptoms is required. After every repair, test all functions to ensure no problems are evident.

2.3.2.

STARTING TROUBLESHOOTING

Select the appropriate troubleshooting method according to the symptoms.

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2.3.3.

Simple Check List

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2.3.4.

TROUBLESHOOTING ITEMS TABLE

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2.3.4.1. ADF (Auto Document Feed) Section

1. No document feed

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2. Paper JAM

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3. Multiple feed

When using thick paper etc., If the document will not feed.

Refer to 3.1. ADJUSTING THE FEED PRESSURE.

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4. Skew

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5. Image is distorted (When printing)

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6. Black or white vertical lines appear

7. Skewed receiving image

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8. Expander print (When printing)

9. When copying or printing, an abnormal sound is heard from the unit

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2.3.4.2. Communication Section

Find the problem in the table shown below, and refer to the corresponding troubleshooting procedure in 2.3.4.2.1. Defective

facsimile section.

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2.3.4.2.1. Defective facsimile section

1. Transmit problem

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2. Sometimes there is a transmit problem

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3. Reception problem

Confirm the following before starting troubleshooting.

Is the recording paper installed properly?

There is the receiving problem when sometimes the below errors may be occurred.

OUT OF PAPER

CHECK COVER

Unit OVERHEATED (If it doesn´t return automatically, COVER OPEN, etc., reset the unit.)

CHECK DOCUMENT

PAPER JAM

Please refer to 2.2. User Recoverable Errors for the above items.

Also, when a hardware deformity occurs, please check each sensor.

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4. The unit can copy, but cannot transmit/receive

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5. Unit can copy, but cannot transmit/receive long distance or international communications

The following 2 causes can be considered for this.

Cause 1:

The other party is executing automatic dialling, the call has been received by this unit, and the CED or DIS signal response

time is too long. (In most cases, this unit detects the CNG signal and can respond to the CED or DIS.) (According to the ITU-

T standard, the communication procedure is stopped when there is no response from the other party within 35 sec, so that

the other party releases the line.)

(Cause and Countermeasure)

As shown in the chart above, the total handshaking time must be reduced. Long distance connection and linking of several

stations means the line connection time cannot be reduced. Accordingly, the following countermeasures should be attempted.

(A) The TEL/FAX DELAYED RING count should be 1. (User parameter: code No. 78)

(B) As the 35 sec. count starts directly after dialing or directly after the START button has been pressed for models with a

START button, the other party should be called manually, if possible.

Another possibility is entering two pauses at the end of the auto dial number on the transmission side. Then the count start time

will be delayed for 2 pauses (about 10 sec.).

Cause 2:

Erroneous detection due to an echo or echo canceler.

(Echo/Echo Canceler)

The signal from FAX1 reaches FAX2 via the stations 1 and 2, but the reflection signal at station 2 also returns via station

1(echo). As the distance between station 1 and station 2 is far, the echo returns to FAX 1 a max. of 600 msec after

transmission. There is a possibility that this signal is detected erroneously as the signal from FAX2. For a normal call, there is

a possibility that the echo of their own voice will make the call difficult to understand. For this reason, each station (station 1,

station 2) attaches echo cancellers (S1, S2) for international lines or long distance lines. For the echo canceller, the level of the

transmission signal from FAX 1 is compared with the level of the reception signal from FAX2. When the S1 is closed and S2

is open, so that the echo does not return to FAX1.

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(Causes and Countermeasures)

(Cause A)

When a training signal is transmitted from FAX1 during the communication procedure at the time of transmission from FAX1

toFAX2, there is a delay until the echo canceler operates. S1 is closed so that a part of the head of the training signal may

dropout. Normal reception by FAX2 may not be possible, and transmission may not be started.

(Countermeasure A)

When the international line mode is ON in the service mode (code No. 521), a dummy signal is attached to the head of the

training signal to prevent this problem. As this normally is ON, it is necessary to reconfirm that this has not become OFF. When

the international mode is switched OFF, the transmission side will try the training signal three times at each speed (9600BPS,

7200BPS, 4800BPS and 2400BPS). If NG, it will drop the speed by one rank (fall-back). When the international mode is

switched ON, each speed will be tried only twice. In other words, the slower speed with fewer errors can be accessed more

easily. This is done because the line conditions may deteriorate and the picture may be affected more easily during

communication for international lines or long distance communication, even when the training is OK. The default value is ON

as preference is given to clearer pictures rather than speed.

(Cause B)

The echo canceller operation is stopped with a 2100Hz signal (i.e. S1 and S2 become ON).

Accordingly, when FAX1 has executed automatic reception, a CED signal is output. If this signal is 2100Hz, S1 and S2 will

become ON. Then the echo of the DIS signal output afterwards may be received and FAX1 may execute an erroneous

operation, preventing communication from starting.

(Countermeasure B)

In the service mode, the time setting between the CED signal and the DIS signal is set from 75 msec to 500 msec in the service

mode (code No.593). This is because the echo canceller operation stop mode is cancelled by an interval of 250 msec or more.

Reduce receiving sensitivity to reduce the effect of RCV echo signal. (service mode: code No. 598)

(Cause C)

This model is FAX1 and the other party is FAX2.

For transmission from FAX1 to FAX2, FAX2 executes automatic reception and transmits a CED signal (2100 Hz) followed by

a DIS signal. As the echo cancellers stops as described in cause B, the echo of the DIS signal returns to FAX2. On the other

hand, FAX1 detects the DIS signal and transmits a DCS signal. In other words, it is possible that the echo of the DIS signal and

the DCS signal transmitted from FAX1 reach FAX2 one after the other. FAX2 detects an error and communication is not started.

(Countermeasure C)

When the international DIS detection setting is set in the service mode (code No.594), FAX1 does not respond to the first DIS

signal and returns a DCS signal only for the second DIS signal.

In other words, there is an interval of 250 msec between transmission of first and second DIS signal so that the echo cancellers

operation recovers. An echo is not generated for the second DIS signal.

Note:

When the other FAX does not respond with a DCS signal after DIS signal transmission, the DIS signal is transmitted three

times for trial.

Summary:

Long distance and international communication operation

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6. The unit can copy, but the transmission and reception image is incorrect

(Long distance or international communication operation)

This depends widely on the transmission and reception capability of the other FAX unit and the line conditions.

The countermeasures for this unit are shown below.

Transmission Operation:

Set the transmitting speed to 4800BPS (service mode: code No. 717) or select the overseas mode.

Reception Operation:

If 80% or more of the reception is incorrect, set the receiving speed to 4800BPS. (Service mode: code No. 718)

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7. How to output the Journal Report:

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TX=TRANSMISSION RX=RECEPTION

Most fax communication problems can be resolved by the following steps.

a. Change the transmit level. (Service code: 596, refer to 2.4.4. Service Function Table.)

b. Change the TX speed/RX speed. (Service code: 717/718, refer to 2.4.4. Service Function Table.)

If the problem remains, see the next page.

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Countermeasure

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2.3.4.2.2. Remote programming

If, after the call is connected, the customer describes the situation and it is determined that the problem can be corrected by making

parameter changes, this function makes it possible to change parameters such as the user code and service code from another

fax (using DTMF tones). Therefore, travel to the customer´s location is not required. However, it is not possible to change all the

parameters remotely (2. Program mode table). The function used to accomplish this is remote programming.

First, in order to check the current status of the service code parameter, out put the setup list (code: 991) and service list (code:

999) from the customer´s fax machine. Based on this, the parameters for the desired codes can be changed. The procedure for

changing and listing parameters is described on 1. Entering the remote programming mode and Changing service codes.

Also, before exiting the remote programming mode, it is advisable to obtain a new list to confirm that only the desired parameters

were changed.

Hint:

Since the connected telephone is in use during the remote programming mode, it may be helpful to ask the customer to switch

to the speakerphone (except for a digital speakerphone). This frees the customer from the need to remain right next to the fax

while you are making parameter settings. When finished, inform the customer. Also note that in very noisy locations where the

DTMF tones are not audible, the remote programming function will not work.

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1. Entering the remote programming mode and changing service codes

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2. Program Mode Table

Code

001

002

003

004

007

013

022

023

025

030

031

041

046

049

058

070

076

077

078

080

501

502

503

520

521

522

523

524

544

550

551

553

554

555

556

557

558

559

561

563

570

571

572

573

590

591

592

593

594

595

596

598

717

718

719

721

722

763

771

774

815

844

991

992

Function

Set Value

mm/dd/yy hh:mm

---------

1:ERROR 2:ON 3:OFF

1 to 4 rings

1:PULSE/2:TONE

1:ON 2:OFF

ON/OFF

3 to 9 rings

1:A 2:B 3:C 4:D 5:OFF

ON/OFF

1:ON 2:OFF

1:NORMAL/2:LIGHT/3:DARKER

ON/OFF

1:ON 2:OFF

1:FAX ONLY/2:TEL/FAX

1 to 4 rings

Default

---------

Remote setting

---------

Set the date and time

Your logo

Your telephone number

Print transmission report

FAX ring count

ERROR

2 ring

TONE

OFF

3 rings

OFF

ON/ID=*9

ON/ID=*0

NORMAL

OFF

Dialing mode

Journal auto print

Overseas mode

Delayed send

Silent FAX recognition ring

Ring detection

FAX activation code

Friendly reception

Auto disconnect

Original setting

FAX pager

Connecting tone

Auto answer mode

TEL/FAX delay ring

Set the default

Pause time set

Recall time set

FAX ONLY

YES/NO

050

001~600 X 100 msec

01~99 X 10 msec

1:10pps 2:20 pps

1:2100Hz 2:1100Hz

1:ON 2:OFF

01~99 step

Press "START".

1:OFF 2:P-B 3:ALL

Press "START".

1:ON 2:OFF

Press any key.

00~30 mm

1:61% 2:67%

00~99

001~999 set

Dial speed set

CED frequency select

International mode select

Auto standby select

Receive equalizer select

SND EQL.

2100

OFF

Document feed position adjustment value set

Memory clear

---------

OFF

---------

ROM check

Monitor on FAX communication select

Modem test

Scanner test

Motor test

LED test

LCD test

Document jam detection select

Key test

CCD position adjustment value set

Break % select

---------

61%

ITS auto redial time set

ITS auto redial line disconnection time set

Remote turn-on ring number set

FAX auto redial time set

FAX auto redial line disconnection time set

CNG transmit select

Time between CED and 300 bps

Overseas DIS detection select

Receive error limit value set

Transmit level set

014

030

045

ALL

01~99

00~99

001~999

1:OFF/2:ALL/3:AUTO

1:75/2:500/3:1s

1:1st/2:2nd

001~999

15~00dBm

75 ms

1st

100

-10

Modem sesitivity

20~48

Transmit speed select

Receive speed select

Ringer off in TEL/FAX mode

Pause tone detect

1:9600/2:7200/3:4800/4:2400bps

1:ON/2:OFF

1:10S/2:20S/3:30S

1:35 sec/2:60 sec

00~99 (X100ms)

Press "START".

1:NORMAL/2:LIGHT/3:DARKER

1: START

9600bps

20S

Redial tone detect

Friendly reception CNG detection select

T1 timer

35 sec

---------

NORMAL

---------

T4 Timer

Sensor check

Original setting

Transmit basic list

Transmit advanced list

1: START

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Code

994

996

Function

Set Value

Default

---------

Remote setting

Transmit journal report

Journal 3

Transmit service list

1: START

999

OK : Can set the value by the remote programming feature or print a list.

NG : Cannot set the value.

Note:

Note: Refer to 2.4.4. SERVICE FUNCTION TABLE for descriptions of the individual codes.

For example, the "004 Transmission report mode" set value "1:ERROR/2:ON/3:OFF" number corresponds to the number

dialled.

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2.3.4.3. Digital Board Section

One of most difficult problems to deal with is when the system will not boot up.

The symptom: No response when the power is turned on. (No LCD display, keys are not accepted.)

Then first thing to do is check the power source, If there is no problem with the power supply unit, then there is a problem with the

digital unit (main board).

As there are many potential causes in this case (ASIC, etc.), it may be difficult to specify what you should check first. If a mistake

is made in the order of checks, a normal part may be determined faulty, wasting both time and money.

Although the tendency is to regard the problem as a serious one (IC malfunction, etc.), usually most cases are caused by solder

faults (poor contact due to a tunnel in the solder, signal short circuit due to solder waste).

Note:

1. Electrical continuity may have existed at the factory check, but a faulty contact occurred as a result of vibration, etc., during

transport.

2. Solder waste remaining on the board may get caught under the IC during transport, causing a short circuit.

Before we begin mass production, several hundred trial units are produced at the plant, various tests are applied and any

malfunctions are analyzed. (In past experiences, digital IC (especially SRAM and ROM) malfunctions are extremely rare after

installation in the product.)

This may be repaired by replacing the IC, (ASIC etc.). However, the real cause may not have been an IC malfunction but a

soldering fault instead.

Soldering faults which are difficult to detect with the naked eye are common, particularly for an ASIC and RA (Resistor Array). But

if you have an oscilloscope, you can easily determine the problem site or IC malfunction by checking the main signal lines.

Even if you don´t have such a measuring instrument, by checking each main signal line and resoldering it, in many cases the

problem will be resolved.

An explanation of the main signals (for booting up the unit) is below.

What are the main signals for booting up the unit?

Please refer to the 2.3.4.3.1. Digital Block Diagram.

The ASIC (including the CPU) (IC1) controls all the other digital ICs. When the power is turned on, the ASIC (CPU) retrieves the

operation code stored in the ROM (IC2), then follows the instructions for controlling each IC. All ICs have some inner registers that

are assigned to a certain address.

It is the address bus by which the ASIC (CPU) designates the location inside each IC. And the data bus reads or writes the data

in order to transmit the instructions from the ASIC (CPU) to the ICs.

These signal lines are all controlled by voltages of 5V (H) or 0V (L).

ANALOG PORT CONTROL

I/O

ROM (IC2)

SRAM (IC3)

A0-17

ANALOG FRONT END (IC5)

ANALOG SW

(IC6)

TO ANALOG

A0-17

D0-7

TXOUT

RXIN

20.736MHz

+24V

IC7

LED ON

H/S RX

H/S TX

+5V

TO ANALOG

CIS

ASIC

IC1

CIS-CTL

VOL

CLK, SIG

24V

TH ON

HEAD-CTL

OPE PANEL

Q13

KSTART,KLATCH,KSCLK,KTXD,KRXD,KIN0,KIN1,KIN2,KIN3

RS,E

XWDERR

STBI-2,THLAT

THCLK,THDAT

THERMAL HEAD

MOTOR

32.768KHz 24MHz

(IC7)

T0,T2~T5

MOTOR

DRIVER

(IC4)

RESET

BACK UP

TO SRAM (IC3)

KX-FT21RS

The signal lines that must be normal for the system to boot up are listed here [List 1].

For signal lines other than these, even if they malfunction they do not directly affect booting up the system.

KX-FT21RS

Normal Wave Patterns

KX-FT21RS

For these reasons and the software sequence to boot up the unit, if you use an oscilloscope to judge whether a signal is OK or NG,

you must check in the same order as in [List 1]. (If the ASIC (CPU) failed to access the ROM, the ASIC cannot access the SRAM

or DRAM normally.)

The digital circuit actually operates according to the timing combinations of these signals. So, if the timing of these signals is even

slightly off, the circuit will not operate normally. Even of the IC did malfunction, the output voltage level may become abnormal but

the timing is accurate according to the specifications. (If oscillation is provided accurately.)

Accordingly, the problem presented here is whether each IC outputs the correct signal. (See the I/O and Pin No. diagram.) In other

words, is it constantly switching between 5V or 3.3V (H) and 0V (L) as described earlier.

I/O and Pin No. Diagram

KX-FT21RS

After the power is turned on, the ASIC (CPU) initializes and checks each IC.

The ROM, SRAM, and Modem are checked.

If initialization fails for the ICs, the system will not boot up.

KX-FT21RS

NG Example

KX-FT21RS

2.3.4.3.2. Check the Status of the Digital Board

Put the unit in the test mode and check the voltage at lands A, B, C and D.

KX-FT21RS

2.3.4.4. Analog Board Section

The analog parts check is actually different than the digital parts check. The signal route is determined by the purpose of the check.

For example, the handset TX route begins from the handset microphone and is output in the telephone line. In this route, it is mainly

an analog signal. Tracing the signal can be done easily using an oscilloscope. Each route is shown on the Check Sheet here. If

there is a problem with the unit (for example, you cannot communicate with the H/S, etc.), trace the signal in the area and determine

the cause.

Note:

{ }: Inside the digital board

KX-FT21RS

1. Defective ITS (Integrated Telephone System) Section

KX-FT21RS

2.3.4.5. Power Supply Board Section

1. Key components for troubleshooting

Check the following parts first: F101, D101-D104, C106, Q101, PC101 and IC101.

This comes from our experience with experimental tests.

For example: power supply and lightning surge voltage test, with standing voltage test, intentional short circuit test, etc.

Caution:

If you find a melted fuse in the unit, do not turn on the power until you locate and repair the faulty parts (except for the fuse);

otherwise the fuse will melt again and you cannot pinpoint the faulty point.

In most cases, the symptom is that nothing is output. It is more likely that the fault is in the primary side rather than the

secondary side. Check the primary side first.

KX-FT21RS

2. Troubleshooting Flow Chart

KX-FT21RS

3. Broken parts repair details

(D101, D102, D103, D104)

Check for a short-circuit in terminal 4. If D101, D102, D103 and D104 are short-circuited, F101 will melt (open).

In this case, replace all of the parts (D101, D102, D103, D104, F101).

(Q101)

The worst case of Q101 is a short-circuit between the Drain and Gate because damage expands to the peripheral circuit of

Q101.

This is due to a very high voltage through the Gate circuit which is composed of R107, R109, D106 and IC101.

You should change all of the parts listed as follows.

F101, Q101, R107, R109, D106, IC101

(D201)

If D201 is broken, the oscillation circuit in the power supply cannot operate. Check it with an electric tester.

KX-FT21RS

2.3.4.6. Operation Board Section

1. No key operation

2. No LCD indication

KX-FT21RS

2.3.4.7. Sensor Section

Refer to 6.5. SENSORS AND SWITCHES for the circuit descriptions.

1. Check the document sensor (PS1)................."REMOVE DOCUMENT"

2. Check the read position (PS2)................."CHECK DOCUMENT"

KX-FT21RS

2.3.4.8. Read Section

Refer to 6.4.4. SCANNING BLOCK.

KX-FT21RS

2.3.4.9. Thermal Head Section

Refer to 6.4.3. THERMAL HEAD.

KX-FT21RS

2.4. PROGRAMMING AND LISTS

The programming functions are used to program the various features and functions of the machine, and to test the machine.

Programming can be done in both the on-hook and off-hook conditions. This facilitates communication between the user and the

service while programming the machine.

2.4.1.

OPERATION

There are 2 basic categories of programming functions, the User Mode and the Service Mode. The Service Mode is further broken

down into the normal and special programs. The normal programs are those listed in the Operating Instructions and are available

to the user. The special programs are only those listed here and not displayed to the user. In both the User and Service Modes,

there are Set Functions and Test Functions. The Set Functions are used to program various features and functions, and the Test

Functions are used to test the various functions.

The Set Functions are accessed by entering their code, changing the appropriate value, then pressing the SET key.

The Test Functions are accessed by entering their code and pressing the key listed on the menu. While programming, to cancel

any entry, press the STOP key.

2.4.2.

OPERATION FLOW

KX-FT21RS

2.4.3.

USER MODE (The list below is an example of the SYSTEM SETUP LIST the unit

prints out.)

Note:

The above values are the default values.

KX-FT21RS

2.4.4.

SERVICE FUNCTION TABLE

Code

Function

Set Value

001~600 × 100 msec

Effective Range

001~600

Default

Remarks

501 Setting the pause time

05000 msec Selects the pause time in 100 msec steps.

502 Setting the flash recall time 01~99 × 10 msec

01~99

700 msec

10 pps

2100 Hz

Selects the line break time during flashing in

10 msec steps.

Sets the pulse dial speed.

503 Setting the pulse dial

speed

1:10pps 2:20pps

1, 2

520 Setting the CED frequency 1:2100Hz 2:1100Hz

When international communications cannot be

performed smoothly, select 1100 Hz.

Selects the international line mode during FAX

communication.

Sets the resolution and contrast conditions for

FAX or copy to the default settings.

When the telephone station is far from the

unit or sending cannot be performed correctly,

set to "ON".

521 Setting the international

line mode

1:ON 2:OFF

522 Setting the return to default 1:ON 2:OFF

mode

523 Setting the reception

equalizer

1:ON 2:OFF

01~99 step

OFF

524 Setting the sending

equalizer

1, 2

OFF

-----

When the telephone station is far from the

unit or sending cannot be performed correctly,

set to "ON".

When the ADF function is incorrect, adjust the

feed position. (8 step = 1mm)

544 Selecting the document

feed position

00~99

550 Memory clear

551 ROM version and sum check

Press "START/COPY/SET".

553 Setting the FAX monitor

function

1:OFF

2:PHASE B

3:ALL

1, 2, 3

OFF

Sets whether to monitor the line signal with

the unit´s speaker during FAX communication

or not.

554 Modem test

555 Scanner test

556 Motor test

557 LED test

Press "START".

558 LCD test

Press "START".

559 Setting the document jam 1:ON 2:OFF

detection

1, 2

See 2.2. USER RECOVERABLE ERRORS.

561 KEY test

Press any key.

563 CCD position adjustment

value set

01~30 × 1 mm

00~30

-----

Lets you select the correction value for the

scanner to align the image.

570 Setting the % break

571 Setting the number of

times that ITS is redialed

1:61% 2:67%

00~99

1, 2

00~99

61%

14 times

Sets the % break of pulse dialing.

Selects the number of times that ITS is

redialed (not including the first dial).

572 Setting the ITS redial

interval

573 Setting of number of time 01~99

that REMOTE TURN ON

BELL sound

001~999 sec

001~999

01~99

030 sec

15 times

Sets the interval of ITS redialing.

Sets the number of times that the unit starts

to receive a document in the TEL mode.

590 Setting the number of FAX 00~99

redial times

00~99

001~999

1, 2, 3

5 times

045 sec

ALL

Selects the number of redial times during FAX

communication (not including the first dial).

Sets the FAX redial interval during FAX

communication.

Lets you select the CNG output during FAX

transmission.

591 Setting the FAX redial

interval

001~999 sec

592 Designation of CNG

sending

1:OFF

2:ALL

3:AUTO

ALL: CNG is output at phase A.

AUTO: CNG is output only when

automatic dialing is

performed.

OFF: CNG is not output at phase A.

593 Setting the interval

1:75 msec

1, 2, 3

1, 2

75 msec

Sets the interval between the CED signal and

subsequent 300 bps signal.

between CED and the 300 2:500 msec

bps signal

3:1000 msec

594 Setting the overseas DIS

detection

1: Detects on the 1st

time.

2: Detects on the 2nd

Detects on

Sets the recognition format of the DIS signal.

the1st time. 1:Detects the first DIS signal sent from the

receiver during FAX transmission.

time.

2:Ignores the first DIS signal sent from the

receiver during FAX transmission.

595 Setting an acceptable

reception error value

596 Setting the transmit level

001~999 × number of

times

- 15~00

001~999

- 15~00

100

Sets the number of acceptable error lines

when the FAX reconstructs the received data.

Selects the FAX transmission level. (Increase

the level when the telephone line condition is

poor.)

- 10 dBm

598 Modem sensitivity

717 Transmit speed select

20~48

1~4

See 2.3.4.2.1. Defective facsimile section.

Adjusts the speed to start training during FAX

transmission.

1:9600BPS

2:7200BPS

3:4800BPS

4:2400BPS

9600 BPS

KX-FT21RS

Code

Function

Set Value

1:9600BPS

2:7200BPS

3:4800BPS

4:2400BPS

Effective Range

1~4

Default

9600 BPS

Remarks

718 Receive speed select

Adjusts the speed to start training during FAX

reception.

719 Ringer off in TEL/FAX

mode

1:ON 2:OFF

1, 2

Sets the ringer switch off when a call is

received in the TEL/FAX mode.

Selects the tone detection for pauses in

dialing.

Selects the tone detection mode after

redialing.

Selects the CNG detection time of friendly

reception.

721 Pause tone detect

722 Redial tone detect

763 CNG detect time

771 T1 timer

1, 2

1:10 sec 2:20 sec

3:30 sec

1:35 sec 2:60 sec

1, 2, 3

1, 2

20 sec

35 sec

Sets a higher value when the response from

the other party needs more time during FAX

transmission.

774 T4 timer

00~99 (×100ms)

00~99

1, 2, 3

815 Sensor check

882 Journal 3 list

844 Original setting

Press "START".

See 2.6.1. PRINTOUT EXAMPLE.

1:NORMAL

2:LIGHT

NORMAL

Use this feature when you need to transmit

and copy a document with very faint writing or

very dark writing.

3:DARKER

2.4.5.

SERVICE MODE SETTINGS (Example of a printed out list)

Note:

The above values are the default values.

KX-FT21RS

2.4.6.

OTHER

KX-FT21RS

2.5. TEST FUNCTIONS

KX-FT21RS

2.5.1.

DTMF SIGNAL TONE TRANSMIT SELECTION

Note:

After performing this check, do not forget to turn the setting off.

Otherwise, dialing using DTMF will not be possible.

2.5.2.

BUTTON CODE TABLE

Note:

These codes (00, 01) are only for the data in the History Report.

2.5.3.

PRINT TEST PATTERN

KX-FT21RS

2.6. JOURNAL 3

Descriptions:

1. ENCODE

Compression Code: MH/MR

2. MSLT

MSLT means Minimum Scan Line Time. Used only at the factory.

3. RESOLUTION

Indicates the resolution of the communication. If multiple pages are transmitted or received, it indicates the last page´s

resolution. If there is a communication error, “?” is displayed.

4. RCV-TRIG. (CNT.)

Indicates the trigger that causes the unit to switch to the fax receive mode. The available options are listed in JOURNAL 2 in

2.6.1. PRINTOUT EXAMPLE. The values in parentheses indicate how many times the trigger has been used. (For example,

“0003” means three times.)

No.

Display

FAX MODE

MAN RCV

FRN RCV

RMT DTMF

PAL DTMF

TURN-ON

TIME OUT

IDENT

Function

Means the unit received a fax message in the FAX mode.

Means the unit received a fax message by manual operation.

Means the unit received a fax message by friendly signal detection.

Means the unit detected DTMF (Remote Fax activation code) entered remotely.

Means the unit detected DTMF (Remote Fax activation code) entered by a parallel connected telephone.

Means the unit started to receive after 15 rings. (Remote Turn On: Service Code #573)

Means the unit started to receive after Ring Time Out in the EXT-TAM or TEL/FAX mode.

Means the unit detected Ring Detection.

TEL/FAX

Means the unit detected the CNN while it was sending the Dummy Ring Back Tone in the TEL/FAX mode.

5. ERROR→MEMORY

Indicates the reason why the unit received a fax message in memory.

If you look at No.11 in the JOURNAL 2 in 2.6.1. PRINTOUT EXAMPLE, it shows the fax message was received in memory due

to “PAPER OUT” error.

NO RESPONSE DISAPPEARED ON JOURNAL

The “NO RESPONSE DISAPPEARED ON JOURNAL” displays the information about the last 10 communications terminated

by “No Response”. (Some of the communications terminated by “No Response” were not displayed in the JOURNAL.)When a

fax transmission cannot be performed because the other party´s unit is set to the TEL mode, “No response” will be printed.

6. EQM

EQM means Eye Quality Monitor. Used only at the factory.

7. ERROR LINE(RX)

When an error occurs while receiving a fax, this shows the number of error lines.

8. MAKER CODE

This shows a 2 digit code of the other partyís fax machine brand.

0E: “KX” model

00: Unknown

79: “UF” model

19: “Zerox” model

KX-FT21RS

2.6.1.

PRINTOUT EXAMPLE

KX-FT21RS

3 ADJUSTMENTS

3.1. ADJUSTING THE FEED PRESSURE

If no feeding or multiple feeding occurs frequently, adjust the feeder pressure.

1. Open the front lid by pressing the front lid open.

2. Shift the position of the lever using an instrument with a pointed end, such as paper clip.

Right: When documents do not feed.

Center: Standard position (pre-selected)

Left: When documents multiple feed.

3. Close the front lid by gently pressing down on both ends.

Note:

Touch the lever using an instrument with a pointed end such as ball-point pen because the lever is located in a small place.

KX-FT21RS

4 DISASSEMBLY INSTRUCTIONS

KX-FT21RS

5 HOW TO REPLACE THE FLAT PACKAGE IC

If you do not have the special tools (for example: SPOT HEATER) to remove the SPOT HEATER´S Flat IC, if you have solder

(large amount), a soldering iron, and a cutter knife, you can easily remove the ICs even if there are more than 100 pins.

5.1. PREPARATION

· SOLDER

Sparkle Solder 115A-1, 115B-1 OR Almit Solder KR-19, KR-19RMA

· Soldering iron

Recommended power consumption is between 30 W to 40 W.

Temperature of Copper Rod 662 ± 50°F (350 ± 10°C)

(An expert may handle a 60~80 W iron, but a beginner might damage the foil by overheating.)

· Flux

HI115 Specific gravity 0.863

(Original flux should be replaced daily.)

5.2. FLAT PACKAGE IC REMOVAL PROCEDURE

1. When all of the IC lead cannot been seen at the standard degree, fill with large quantities of solder.

Note:

If you do not fill with solder and directly cut the IC lead with the cutter, stress may build up directly in the P.C. board´s

pattern. If you do not fill with large quantities of solder as in step 1, the P.C. board pattern may be removed.

2. Using a cutter, cut the lead at the source. (Cut the contents with a cutter lightly, 5 or 6 times.)

3. Remove when the solder melts. (Remove the lead at the same time.)

After removing the Flat IC and when attaching a new IC, remove any of the excess solder on the land using the soldering wire, etc.

If the excess solder is not removed from the land, the IC will slip and not be attached properly

KX-FT21RS

5.3. FLAT PACKAGE IC INSTALLATION PROCEDURE

5.4. BRIDGE MODIFICATION PROCEDURE

KX-FT21RS

6 CIRCUIT OPERATIONS

6.1. CONNECTION DIAGRAM

CN1

CN9

CN102

CN1

CN2

+24V

GND

+5V

JACK

TO TEL LINE

TO EX TEL

+24V

D-GND

+5VD

+5VA

A-GND

BELL

EX-HOOK

RELAY

PAPER

ANALOG

BOARD

HANDSET

CN4

COM

LATCH

STB1

GND

CN10

CN202

CN201

HOOK-IN

SP-MUTE

BREAK

VDD

CLOCK

GND

STR2

DTMF-IMP

P-SHORT

HS-ALC

HS-TX

SP-OUT

HS-RX

SPEAKER

SP+

DIGITAL

BOARD

CN101

SP-

COM

CN3

CN7

CN1

MOTOR

VSS

+5V

VDD

R/W

DB0

DB1

DB2

DB3

DB4

DB5

DB6

DB7

OPESE

CN5

SENSOR

KIN0

KIN1

KIN2

KIN3

KSTAR

LCD

CN8

V.LED

G.LED

CLK

GND

SEL

+5V

CN2

CN6

KSCLK

KLATC

KTXD

KRXD

CIS

GND

SIG

KX-FT21RS

6.2. GENERAL BLOCK DIAGRAM

The control section will be explained as shown in the block diagram.

1. ASIC (IC1)

Composed mainly of an address decoder, modem control section, CPU and RTC.

Controls the general FAX operations.

Controls the operation panel I/F.

Controls the thermal head I/F and CIS I/F.

Executes image processing.

Monitors the H/S volume.

I/O ports

2. ROM (IC2)

Contains all of the program instructions for unit operations.

3. Static RAM (IC3)

This memory is used mainly for the parameter working storage area.

4. MODEM (Incruded in IC1)

Modem for the FAX.

5. Read Section

Contact Image Sensor (CIS) to read transmitting documents.

6. Thermal Head

Contains heating elements for dot matrix image printing.

7. Motor driver (IC7)

Drives the motor and CIS LED.

8. Reset circuit (IC4)

Provides a reset pulse to each of the major ICs.

9. Analog board

Composed of an ITS circuit and NCU circuit.

10. Sensor Section

Composed of a document sensor, recording paper sensor, motor position sensors, read position sensor.

11. Power supply switching board section

Supplies +5V and +24V to the unit.

12. CODEC (IC5)

A/D and D/A converter.

OPERATION PANEL

LCD

POWER SUPPLY

REG

AC220V

SELE

CTOR

+24V

+5V

SENSOR

KEY MATRIX

DIGITAL BOARD

ANALOG BOARD

+24V

+5V

RLY

+24V

+5V

ANA

LOG

LINE

3.3V

SRAM

256k

ROM

REG

MOS SW

EXT.

TEL

CODEC

RESET

ANA

LOG

BELL

PRINTER

CONTROL

OP PANEL

I/F

CPU

I/F

OSC

ASIC

VOL

I/O

HOOK SW

PAPER

HOOK

PAPER

ROM

MODEM

RTC

IMAGE

PROCESSING MOTOR I/F

A/D

SP MUTE

AMP

MOTOR

SENSOR

SPEAKER

HANDSET

ANALOG PORT CONTROL

I/O

ROM (IC2)

SRAM (IC3)

A0-17

ANALOG FRONT END (IC5)

TO ANALOG

ANALOG SW

(IC6)

A0-17

D0-7

TXOUT

RXIN

20.736MHz

+24V

IC7

LED ON

H/S RX

H/S TX

+5V

TO ANALOG

CIS

ASIC

IC1

CIS-CTL

VOL

CLK, SIG

24V

TH ON

HEAD-CTL

OPE PANEL

Q13

KSTART,KLATCH,KSCLK,KTXD,KRXD,KIN0,KIN1,KIN2,KIN3

RS,E

XWDERR

STBI-2,THLAT

THCLK,THDAT

THERMAL HEAD

MOTOR

32.768KHz 24MHz

(IC7)

T0,T2~T5

MOTOR

DRIVER

(IC4)

RESET

BACK UP

TO SRAM (IC3)

KX-FT21RS

6.3.2.

ASIC (IC1)

This custom IC is used for general FAX operations.

1. CPU

This model uses a Z80 equivalent CPU operating at 6MHz.

Many of the peripheral functions are handled by custom designed LSIS. As a result, the CPU only needs to process the result.

2. RTC

Real time clock.

3. DECODER

Decodes the address.

4. MODEM

Execute modulation and demodulation for the FAX.

5. ROM/RAM I/F

Controls the SELECT signal of ROM or RAM and bank switching.

6. CIS I/F

Controls document reading.

7. IMAGE DATA RAM

This is inside the ASIC and has 8KB which is used for image processing.

8. THERMAL HEAD I/F

Transmits the recorded data to the thermal head.

9. MOTOR I/F

Controls the motor which feeds the document and feeds the reading document.

10. OPERATION PANEL I/F

Serial interface with Operation Panel.

11. I/O PORT

I/O Port Interface (for analog board port control).

12. ANALOG UNIT

Electronic volume for the handset and monitor.

Sends beep tones, etc.

Explanation of the Pin Distribution (IC1)

Pin Name

X32OUT

Buffer Power supply 5V Tolerant

Signal Name I/O

X32OUT

Description

VDDRTC

32.768kHz oscillator for RTC (built-in feed back

resistor)

X32IN

VDDRTC

X32IN

32.768kHz oscillator for RTC (built-in feed back

resistor)

VDDRTC

XBACKEN

VDDSRAM

XRAMCS

+3.3V/BATT

XRESET

+3.3V/BATT

VDDSRAM

OPEN

FTG

+5V

OPEN

XRESET

XORESET

XRESETI

XWDERR

OPEN

+3.3V

32.768kHz backup power supply for RTC

Backup enable

RAMCS buffer/backup power supply for reset

SRAM chip select ("H": 3.3V or BATT)

Not used

FTG

F1 (50%/75% selector)

Power supply

Ground

VDDRTC

YES

VDDSRAM

MULT3/5

XRAMCE2/ALARM

FTG

MULT3/5

VSS

F2/OP50

FR/OP51

XRESET

VSS

XORESET

XRESETI

MULT3/5

3.3V

YES

LCD control

Not used

Reset input for internal digital circuit

Ground

Reset output

Voltage detector IC output for reset

Watch dog timer error

Not used

3.3V

YES

XWDERR

XRSTSWO/OP82

VIDRST/IOP20

SPHCLK/IOP21

DARKON/IOP22

ADSEL2/IOP23

BELL/OP

Not used

Power supply

3.3V

101

KX-FT21RS

Pin Name

IRDATXD/IOP81

IRDARXD/IOP80

TXD/IOP30

RXD/IOP31

XRTS/IOP32

XCTS/IOP33

XDSR/IOP34

DCD/IOP35

XDTR/IOP36

RI/CLK/IOP37

IOP90

Buffer Power supply 5V Tolerant

Signal Name I/O

Description

3.3V

YES

OPEN

BREAK

H/S ALC

DTMF IMP

P-SHORT

OPEN

Not used

TEL Line Break Control

Not used (Hardware Control)

DTMF-IMP Control

P-SHORT Control

Not used

Ground

Not used

Power supply

Not used

IOP91

VSS

IOP92

IOP93

IOP94

IOP95

3.3V

YES

OPEN

+3.3V

FMEMCS/IOP27

FMEMDO/IOP26

FMEMDI/IOP25

FMEMCLK/IOP24

CBUSY2

CSO/OP70

CBUSY1

CCLK

3.3V

YES

OPEN

Not used

TELRXENB I/O Telephone RX root control

OPEN

Not used

3.3V

MULT3/5

3.3V

YES

CSI

OPEN

Not used

MIDAT/IOP45

MICLK/IOP46

MILAT/IOP47

RVN

CPC

TONE1

TONE2

VSS

3.3V

EVOLIN

EVOLOUT

EVOLREF

VSS

MTXENB

MOMRXENB

H/SRXENB

BELL

Modem TX route control

Modem RX route control

Handset RX route control

Bell signal detection

Recording paper detection

Not used

PAPER

TONE1

TONE2

3.3V

Tone2 (bell alarm key tone)

Ground

+3.3V

Power supply

(3.3V)

EVOL IN

EVOL OUT

EVOL REF

Electronic volume (handset monitor)

Ground

IOP57

3.3V

YES

EX-HOOK

XINTMDM

XMDMINT

XNMI

Not used

Modem interrupt

XMDMINT

XINTMDM

XNMI/XINT

EYECKO

APDMDT

Modem INT output/general output

NMI

3.3V

MULT3/5

3.3V

MULT3/5

YES

EYECKO

APDMDT

+5V

DPDMDT

DPDMCK

MUTE

XEYESYC

EYEDAT

XRESETD

CPUCK

OPEN

Modem AFE connection (APDMCK)

Modem AFE connection

Power supply

Modem AFE connection

Modem eye pattern EYESYNC

Modem eye pattern EYEDAT

Modem AFE connection

CPU clock (6MHz) output

Not used

MULT3/5

DPDMDT

DPDMCK

MUTE

XEYESYC

EYEDAT

XRESETD

CPUCK

MULT3/5

3.3V

XHOLDAK

XWAIT/IP60

XHOLD/IP61

XHSTRD/IOP40

VSS

XINMDM

XOUTMDM

TEST1

3.3V

YES

HOOK

Hook detection

Not used

Handset TX mute

Ground

PULL DOWN

H/S MUTE

3.3V

20.736MHz crystal oscillator buffer

Test pin. fixed High

24MHz clock output

+3.3V

XTEST

TEST2

XTEST

102

KX-FT21RS

Pin Name

TEST3

XOUT

XIN

VSS

Buffer Power supply 5V Tolerant

Signal Name I/O

Description

3.3V

+3.3V

XOUT

XIN

+3.3V

Test pin. fixed High

24MHz oscillator

Ground

Power supply

Test pin. fixed High

Tel line relay control

Speaker mute control

Not used

Data bus

ROM chip select

Read signal output

Power supply

Write signal output

Address bus

Ground

Address bus

Ground

Power supply

Address bus

Bank address

Not used

3.3V

TEST4

XHSTWR/IOP41

3.3V

YES

RLY

100 XOPRBE/MUX/OP53

SP-MUTE

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

144

145

146

147

148

149

150

151

152

153

154

155

156

157

158

159

XRAS/IOP42

XCAS1/IOP43

XCAS2/IOP44

DB3

DB2

DB4

DB1

DB5

DB0

DB6

DB7

XROMCS

XRD

YES

OPEN

XROMCS

/RD

+3.3V

/WR

3.3V

XWR

ADR0

ADR1

ADR2

VSS

ADR3

ADR4

ADR5

ADR6

ADR7

ADR8

ADR9

ADR10

VSS

3.3V

ADR11

ADR12

RBA0

RBA1

RBA2

RBA3

RBA4

3.3V

+3.3V

A13

3.3V

RBA5/OP

RBA6/IOP

XRESCS1/OP72

XRESCS2/OP71

XMDMCS/OP

VSS

XRESCS3/OP52

20KOSC/IOP56

ADR13

Not used

Ground

Not used

Power supply

Not used

Motor control

CIS LED control

Not used

OPEN

+3.3V

OPEN

3.3V

YES

ADR14

3.3V

ADR15

3.3V

RM0/IOP00

RM1/IOP01

RM2/IOP02

RM3/IOP03

RXE/IP04

TM0/IOP10

TM1/IOP11

TM2/IOP12

TM3/IOP13

TXE/IP14

STB1

YES

LEDON

OPEN

PULL DOWN

STB1

Not used

Pull down

3.3V

MULT3/5

Thermal head strobe 1

103

KX-FT21RS

160

161

162

163

164

165

166

167

168

169

170

171

172

173

174

175

176

177

178

179

180

181

182

183

184

185

186

187

188

189

190

191

192

193

194

195

196

197

198

199

200

201

202

203

204

205

206

207

208

Pin Name

STB2

STB3

STB4

THDAT

VSS

MULT3/5

THCLK

THLAT

STBNP

3.3V

TXD2/IOP

RXD2/IOP

RTS2/IOP

CTS2/IOP

DSR2/IOP

DCD2/IOP

DTR2/IOP

RI2/IOP

XRSTSWI/IP83

KEYIN0

KEYIN1

KEYIN2

KEYIN3

KEYIN4

KEYIN5

OPLED

VSS

Buffer Power supply 5V Tolerant

Signal Name I/O

Description

Thermal head strobe 2

Not used

Thermal data

MULT3/5

STB2

OPEN

TH DATA

Ground

+5V

Power supply for THCLK DAT LAT STB

Thermal head clock

Thermal head latch

MULT3/5

3.3V

YES

TH CLK

TH LAT

CIS SEL

+3.3V

TH ON

Power supply

Thermal head 24V ON

3.3V

YES

I/O LCD control

OPEN

CIS ON

MOTOR PO.

OPEN

PULL DOWN

KIN0

Not used

Motor position detection

Not used

Pull down

I/O Key read

KIN1

I/O Key read

KIN2

KIN3

I/O Key read document sensor control

I/O Key read read start position sensor control

OPEN

OPESEL

Not used

OD Operation panel control

GND

3.3V

OD Power supply

KSTART

KLATCH

KSCLK

KTXD

KRXD

ADSEL1

VSSC

VREFB

VREFT

BIAS

VREFH

VDDC

VSSA

VDDA

VDDB

VCL

AIN3

AIN1

AMON

AIN2

3.3V

YES

KSTART

KLATCH

KSCLK

KTXD

KRXD

ADSEL1

OD LCD control

OD Key scan LCD control

Key scan LCD control

Document read start position sensor

Thermal head temperature detection trigger

Ground for analog image process

A/D reference-

Analog

VREFB

VREFT

BIAS

VREFH

+3.3V

VCL

AIN3

AIN1

OPEN

AIN2

A/D reference+

A/D reference center

Power supply for analog image process

Ground for analog image process

Power supply for analog image process

Clamp level

Analog

Analog image signal (CIS output signal input)

Not used

Thermistor voltage detection

Ground for analog image process

VSSB

104

KX-FT21RS

6.3.3.

ROM (IC2)

This 128 KB ROM (OTPROM or MASKROM) has 32 KB of common area and bank area (BK4~BK15).

The capacity of each bank is 8 KB.

The addresses of the common area are from 0000H to 7FFFH, and addresses 8000H to 9FFFH are for the bank area.

6.3.4.

RAM (IC3)

This 32 KB RAM has 8 KB of common area and bank area (BK0, BK1).

The capacity of each bank is 12 KB.

The addresses of the common area are from D000H to EFFFH, and addresses A000H to CFFFH are for the bank area.

6.3.5.

Reset Circuit

The output from pin 1 of the Reset IC (IC4) resets the gate array (IC1).

1. During a power surge, a positive reset pulse of 175 msec or more is generated and the system is reset completely.

This is done to prevent partial resetting and system runaway during a power fluctuation.

2. When pin 1 of IC4 becomes low, it will prohibit the RAM (IC3) from changing data.

The RAM (IC3) will go into the backup mode, when it is backed up by a lithium battery.

3. The watch dog timer, built-in the gate array (IC1), is initialized about every 1.5 ms.

When a watch dog error occurs, pin 18 of the gate array (IC1) becomes low.

The terminal of the WDERR signal is connected to the reset line so the WDERR signal works as the reset signal.

105

KX-FT21RS

6.3.6.

SRAM and RTC BACK UP CIRCUIT

1. Function

This unit has a lithium battery (BAT1) which works for the RAM (IC3) and Real Time Clock (RTC, Integrated into ASIC:IC1).

The user parameter for auto dial numbers, the transmission ID, the system setup date and so on are stored in the RAM (IC3).

The RTC continues functioning, even when the power switch is OFF, backed up by a lithium battery.

2. Circuit Operation

When the power is turned ON, power is supplied RAM (IC3) and RTC (IC1).

At this time, the voltage at pin 28 of RAM is +5V and pin 3 of RTC (IC1) is +3.3V. When the power is turned OFF, the battery

supplies the power to RAM and RTC through J1, R14,D1 or D7. At that time, the voltage at pin 28 of RAM and pin 3 of IC1 are

about +2.5V. When the power is OFF and the +5V and +3.3V voltages decrease, IC4 detects them and LOW is input to pin 17

of IC1. Pin 16 of IC1 outputs the reset signals. Pin 28 of RAM (IC3) and pin 3 of RTC (IC1) become low, then RAM and RTC

(IC1) go into the back up mode, when the power consumption is lower.

106

KX-FT21RS

6.3.7.

SUPERVISION CIRCUIT FOR THE THERMAL HEAD TEMPERATURE

1. Function

The thermistor changes the resistor according to the temperature and uses the thermistor´s characteristics.

The output of pin 193 of IC1 becomes a low level.

Then when it becomes a high level, it triggers point (A).

In point (C), according to the voltage output time, the thermal head´s temperature is detected.

After the thermal head temperature is converted to voltage in (B), it is then changed to digital data in the A/D converter inside

IC1. The CPU decides the strobe width of the thermal head according to this value. Therefore, this circuit can keep the thermal

head at an even temperature in order to stabilize the printing density and prevent the head from being overheated.

107

KX-FT21RS

6.3.8.

LED ARRAY(CIS)

The LED ARRAY will light during transmission and copying as a light source to recognize document characters, patterns, or

graphics on a document.

It is also possible to light the LED ARRAY in the test mode.

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KX-FT21RS

6.4. FACSIMILE SECTION

6.4.1.

IMAGE DATA FLOW DURING FACSIMILE OPERATION

COPY (Fine, Super-Fine, Half Tone)

1. Line information is read by CIS, via route (1), and is input to IC1.

2. In IC1, the data is adjusted to a suitable level for A/D conversion in the Analog Signal Processing Section, and via route (2)

it is input to A/D conversion (8 bit). After finishing A/D conversion, the data is input to the Image Processing Section via route

(3). Then via routes (4) and (5), it is stored in RAM as shading data.

3. The draft´s information that is read by CIS is input to IC1 via route (1). After it is adjusted to a suitable level for A/D

conversion via route (2), the draft´s information is converted to A/D (8 bit), and it is input to the Image Processing Section.

The other side, the shading data which flows from RAM via routes (6) and (7), is input to the Image Processing Section.

After finishing the draft´s information image processing, white is regarded as "0" and black is regarded as "1".

Then via routes (4) and (5), they are stored in RAM.

4. The white/black data stored as above is input to the P/S converter via routes (6) and (8).

The white/black data converted to serial data in the P/S converter is input to the Thermal Head via route (9) and is printed

out on recording paper.

Note:

Standard: Reads 3.58 times/mm

Fine: Reads 7.7 times/mm

Super-Fine: Reads 15.4 times/mm

Transmission

1. Same processing as COPY items 1) - 3).

2. The data stored in RAM of IC1 is output from IC1 via routes (6) and (10), and is stored in the system bus.

Via route (11), it is stored in the communication buffer inside RAM (IC3).

3. While fetching data stored in the communication buffer synchronous with the modem, the CPU inputs data to the modem

along route (12) and (14).

In the analog front end IC (IC5) it is converted to serial analog data and forwarded over telephone lines via the NCU Section.

Reception

1. The serial analog image data is received over telephone lines and input to the analog front end IC (IC5) via the NCU section,

where it is demodulated to parallel digital data. The balance data is sent to the modem. Then the CPU stores the data in

the communication buffer of RAM (IC3) along route (11) and (15).

2. The data stored in RAM (IC3) is decoded by the CPU via route (12), and is stored in RAM by routes (13) and (5).

3. Same processing as COPY item 4).

109

KX-FT21RS

6.4.2.

Block Diagram

SYSTEM

IC1

BUS

CONTACT

IMAGE

SENSOR

(2)

(1)

IC3

(3)

ANALOG

SIGNAL

PROCESSING

SECTION

(12)

(11)

RAM

IMAGE

PROCESSING

SECTION

IC2

(4)

(7)

CPU

RAM

ROM

(5)

(6)

(13)

(10)

(14)

(15)

(8)

MODEM

THERMAL

HEAD

(9)

Analog

Front/End

IC5

(AFE)

P/S

CONVERTER

NCU

TEL.LINE

110

KX-FT21RS

6.4.3.

THERMAL HEAD

1. Function

This unit utilizes state of the art thermal printer technology.

The recording paper (roll paper) is chemically processed. When the thermal head contacts this paper it emits heat momentarily,

and black dots (appearing like points) are printed on the paper. If this continues, letters and/or diagrams appear, and the original

document is reproduced.

2. Circuit Operation

There are 9 driver ICs aligned horizontally on the thermal head and each one of these ICs can drive 192 heat emitting registers.

This means that one line is at a density of 192×9=1728 dots=(8 dots/mm).

White/Black (white=0, black=1) data in one line increments is synchronized at IC1 pin 166 (THCLK), and sent from IC1 pin 163

(THDAT) to the shift register of the ICs. The shift registers of the 9 ICs are connected in series, and upon the shift of dot

increment 1728, all the shift registers become filled with data, and a latch pulse is emitted to each IC from IC1 pin 167 (THLAT).

With this latch pulse, all the contents of the shift registers are latched to the latch registers. Thereafter, through the addition of

strobes from the IC1 pins (159, 160) only black dot locations (=1) among latched data activates the driver, and the current

passes to heat the emitting body causing heat emission.

Here, the three line strobes, STB1 to STB2, impress at intervals of 9.216 msec, as required for one-line printout.

The sequence is shown on the next page. [Moreover, for the strobe width, the thermistor value inside the thermal head is

detected according to IC1 pin 207. (See 6.3.1. Block Diagram.) Depending on that value, the strobe width is recorded in ROM

(IC2).

Accordingly, the strobe width is determined.

When the thermal head is not used, the IC1 (170, THON) becomes low, Q8 turns OFF, Q13 turns OFF, and the +24 V power

supply for the thermal head driver is not impressed to protect the IC.

111

KX-FT21RS

112

KX-FT21RS

6.4.4.

SCANNING BLOCK

The scanning block of this device consists of a control circuit and a contact image sensor made up of a celfoc lens array, an LED

array, and photoelectric conversion elements.

When an original is inserted and the start button pressed, pin 154 of IC1 goes to a high level and the transistor inside IC7 turns on.

This applies voltage to the LED array to light it. The contact image sensor is driven by each of the FTG-F1 signals output from IC1,

and the original image illuminated by the LED array undergoes photoelectric conversion to output an analog image signal (AIN).

The analog image signal is input to the system LSI (IC1) on ANA1 (pin 205 of IC1) and converted into 8-bit data by the A/D

converter inside IC1. Then this signal undergoes digital processing in order to obtain a high-quality image.

113

KX-FT21RS

6.4.5.

STEPPING MOTOR DRIVE CIRCUIT

1. Function

One individual stepping motor is used for transmission and reception. It feeds the document or recording paper synchronized

for reading or printing.

2. Circuit Operation

During motor drive, gate array IC1 pin 153 becomes a high level, and Q14 and Q7 go ON as a result. +24 V is supplied to the

motor coil.

Stepping pulses are output from gate array IC1, causing driver IC7 to go ON. The motor coil is energized sequentially in 2 phase

increments or 1-2 phase increments, which causes a 1-step rotation. A 1-step rotation is 0.13mm of recording paper or

document paper. The timing chart is below.

Stepping Motor Phase Pattern

Function

Copy

Mode

Fine/Half Tone

Phase Pattern

Speed

217 pps

1-2

2-2

Super Fine

STD

108.5 pps

217 pps

108.5 pps

434 pps

FAX

Fine/Half Tone

Super Fine

Paper Feed

———

When the motor is OFF, gate array IC1 pin 153 becomes a low level and Q14 and Q7 also turns OFF. Instead of +24V, +5V is

supplied through D2 so that the motor is held in place.

114

KX-FT21RS

6.4.6.

GEAR SECTION

This section shows how the motor-driven gear mechanism works in the main operations: FAX transmission, FAX reception the

motor and copying.

6.4.6.1. Mode Selection

When the motor attached to the Drive Motor Gear rotates counterclockwise (CCW), Swing Gear A-2 engages the CAM and the

CAM turns counterclockwise to select a mode. (See Fig. A.) There are three mode options controlled by the Switch: A:

Transmitmode, B: Receive mode and C: Copy mode. In Fig. B, you can see which mode is selected by the position of the rib in

the CAM.

115

KX-FT21RS

6.4.6.2. Mode Operation

Once a mode is selected, the Drive Motor Gear rotates clockwise (CW) and then the Swing Gear A-1 controls the mode operation.

A: Transmit mode

Swing Gear A-1 engages G6 and conveys its drive power to the Separation Roller Gear for pre-feeding documents.

B: Receive mode

Swing Gear B engages G8 and conveys its drive power to the Platen Roller Gear for printing the received data.

C: Copy mode

Swing Gear A-1 and B engage Gears 6 and 8 respectively and drive both the Separation Roller Gear and the Platen Roller Gear

for feeding documents and recording paper in the copying operation.

6.4.6.3. Mechanical Movements in the Main Operations

6.4.6.3.1. Idle status

116

KX-FT21RS

6.4.6.3.2. Scanning

6.4.6.3.3. Printing

Note:

See 6.5. SENSERS AND SWITCHES.

117

KX-FT21RS

6.4.6.3.4. Copying

118

KX-FT21RS

6.5. SENSORS AND SWITCHES

All of the sensor and switches are shown below.

Sensor Circuit

Location

Sensor

Sensor or Switch Name

Message Error

Digital

Analog

SW3

SW1

SW2

PS2

Motor Position

Cover Open and Paper set

Hook SW

Document Read Position

Document

————

[CHECK COVER] and [OUT OF PAPER]

————

Operation Panel

[REMOVE DOCUMENT]

[CHECK DOCUMENT]

PS1

119

KX-FT21RS

6.5.1.

Motor Position Sensor

This sensor is a detection switch for recording the position of the CAM.

Digital Board

Signal (IC1-174 Pin)

Home position

Other

Low level

High level

6.5.2.

Recording Paper Sensor (SW201)

When there is no recording paper, the plate is separated from the switch lever and the switch turns off.

Pin 9 of CN102 (Analog board) becomes a high level.

When there is recording paper, the plate pushes the switch lever and the switch turns ON.

Pin 9 of CN102 (Analog board) becomes a low level.

Analog Board

Signal (CN102-9 Pin)

Paper

No paper

Low level

High level

120

KX-FT21RS

6.5.3.

Read Position Sensor (PS2)

When a document is brought to the read position, the shelter plate passes the sensor light, the photo transistor becomes ON, and

the input signal of the CN2-3 pin (Operation) becomes a low level. When there is no document at the read position, the shelter plate

closes the sensor light, the photo transistor becomes OFF, and the input signal of the CN2-3 pin (Operation) becomes a high level.

(When checking this sensor, CN1-8 pin, 2pin becomes low level).

Operation Board

Photo transistor

Signal (CN2-3 Pin)

High level

Out of the Read Position

At the Read Position

OFF

Low level

6.5.4.

Document Sensor (PS1)

When a document is set, the shelter plate closes the sensor light, the photo transistor becomes OFF, and the input signal of the

CN2-3 pin (Operation) becomes a high level. When there is no document, the shelter plate passes the sensor light, the photo

transistor becomes ON, and the input signal of the CN2-3 pin (Operation) becomes a low level.

(When checking this sensor, the CN1-8 pin, 3pin becomes a low level.)

Operation Board

Photo transistor

Signal (CN2-3 Pin)

Low level

No document

Set document

OFF

High level

121

KX-FT21RS

6.6. MODEM SECTION

6.6.1.

FUNCTION

The unit uses a 1 chip modem (IC1), enabling it to act as an interface between the control section for FAX sending and receiving,

and the telephone line. During a sending operation, the digital image signals are modulated and sent to the telephone line. During

a receiving operation, the analog image signals which are received via the telephone line are demodulated and converted into

digital image signals. The communication format and procedures for FAX communication are standardized by ITU-T. This 1 chip

modem (IC1) has hardware which sends and detects all of the necessary signals for FAX communication and DTMF.

It can be controlled by writing commands from the ASIC (IC1) to the register in the modem (IC1).

This modem (IC1) also sends DTMF signals, generates a call tone (from the speaker), and detects busy tones, dial tones and

DTMF.

Overview of Facsimile Communication Procedures (ITU-T Recommendation):

1. ON ITU-T (International Telecommunications´ Union.)

The No. XIV Group of ITU-T, one of the four permanent organizations of the International Telecommunications Uniib (ITU),

investigates and make recommendations on international standards for facsimiles.

2. Definition of Each Group

· Group I (G1)

A-4 size documents without using formats which reduce the band width of a signal sent over telephone lines.

Determined in 1968.

Transmission for about 6 minutes at scanning line density of 3.85 lines/mm.

· Group II (G2)

Using reduction technology in the modulation/demodulation format, an A-4 size document is sent at an official scanning line

density of 3.85 lines/mm for about 3 minutes.

Methods to suppress redundancy are not used.

Determined in 1976.

· Group III (G3)

A method of suppressing redundancy in the image signal prior to modulation is used. An A-4 size document is sent with

about one minute.

Determined in 1980.

· Group IV (G4)

Transmission is via the data network. A method is provided for suppressing redundancy in signals prior to transmission, and

error-free reception of transmission is possible.

The scope of these facsimile applications is not limited simply to transmission of written statements. Through symbiotic

linkages with other communication methods, it can be expected to expand to include integrated services.

3. Facsimile Call Time Series

As shown in the following diagram, the facsimile call time series is divided into five phases.

Phase A : Call setting

Call setting can be manual/automatic.

Phase B : Pre-message procedure

Phase B is a pre-processing procedure and sequence for confirming the status of the terminal, transmission route, etc. and for

terminal control. It implements the terminal preparation status, determines and displays terminal constants, confirms

synchronization status, etc. and prepares for transmission of facsimile messages.

Phase C : Message transmission

Phase C is the procedure for transmitting facsimile messages.

Phase D : Post message procedure

122

KX-FT21RS

Phase D is the procedure for confirming that the message is completed and received. For continuous transmission, phase B

or phase C are repeated for transmission.

Phase E : Call retrieval

Phase E is the procedure for call retrieval, that is for circuit disconnection.

4. Concerning Transmission Time

Transmission Time = Control Time + Image Transmission Time + Hold Time

Transmission time consists of the following.

Control time:

This is time at the start of transmission when the functions at the sending and receiving sides are confirmed, the

transmission mode is established, and transmission and reception are synchronized.

Image transmission time:

This is the time required for the transmission of document contents (image data). In general, this time is recorded in the

catalog, etc.

Hold time:

This is the time required after the document contents have been sent to confirm that the document was in fact sent, and to

check for telephone reservations and/or the existence of continuous transmission.

5. Facsimile Standards

Telephone Network Facsimile

Item

G3 Machine

Telephone Network Signal Mode

T. 30 Binary

Connection Control Mode

Terminal Control Mode

Facsimile Signal Format

Modulation Mode

Digital

PSK (V. 27 ter) or QAM (V. 29)

Transmission Speed

300 bps (Control Signal)

2400, 4800, 7200, 9600 bps (FAX Signal)

Redundancy Compression

Process

1 dimension: MH Mode

2 dimension: MR Mode (K=2.4)

(Coding Mode)

Resolution

Main Scan: 8 pel/mm

Sub Scan: 3.85, 7.7l/mm

Line Synchronization Signal

EOL Signal

1 Line Transmission Time

[ms/line]

Depends on the degree of data reduction.

Minimum Value: 10, 20

Can be recognized in 40ms.

6. Explanation of Technology

a. G3 Communication Signals (T. 30 Binary Process)

For G3 facsimile communication, this is the procedure for exchanging control signals between the sending and receiving

machines both before and after transmission of image signals.

Control signals at 300 bps FSK are: 1850 Hz...0, 1650Hz...1.

An example of the binary process in G3 communication is shown below.

123

KX-FT21RS

Explanation of Signals

Control signals are comprised mainly of 8-bit identification signals and of the data signals added to them. Data signals are

added to DIS and DCS signals.

Signal.....DIS (Digital Identification Signal)

Identification Signal Format.....00000001

Function:

Notifies the capacity of the receiving unit. The added data signals are as follows.

(Example)

Bit No.

DIS/DTC

Transmitter - T.2 operation

Receiver - T.2 operation

DCS

Receiver - T.2 operation

T.2 IOC = 176

Transmitter - T.3 operation

Receiver - T.3 operation

Reserved for future T.3 operation features.

Transmitter - T.4 operation

Receiver - T.4 operation

11, 12

(0, 0)

(0, 1)

(1, 0)

(1, 1)

Data signaling rate

V.27 ter fall back mode

V.27 ter

V.29

V.27 ter and V.29

Data signaling rate

2400 bit/s, V.27 ter

4800 bit/s, V.27 ter

9600 bit/s, V.29

7200 bit/s, V.29

Reserved for the new modulation system.

Vertical resolution = 7.7 line/mm

Two-dimensional coding

Two-dimensional coding capability

124

KX-FT21RS

Bit No.

17, 18

(0, 0)

DIS/DTC

Recording width capabilities

1728 picture elements along scan line length of

DCS

Recording width

1728 picture elements along scan line length of

215 mm ± 1%

(0, 1)

1728 picture elements along scan line length of

215 mm ± 1% and

2432 picture elements along scan line length of

303 mm ± 1%

2048 picture elements along scan line length of

255 mm ± 1% and

2432 picture elements along scan line length of

303 mm ± 1%

(1, 0)

(1, 1)

1728 picture elements along scan line length of

215 mm ± 1% and

2048 picture elements along scan line length of

255 mm ± 1%

Invalid

2048 picture elements along scan line length of

255 mm ± 1%

Invalid

19, 20

(0, 0)

(0, 1)

(1, 0)

(1, 1)

Maximum recording length capability

A4 (297 mm)

Unlimited

A4 (297 mm) and B4 (364 mm)

Invalid

Maximum recording length

A4 (297 mm)

Unlimited

B4 (364 mm)

Invalid

Signal.....DCS (Digital Command Signal)

Identification Signal Format.....X1000001

Function:

Notifies the capacity of the receiving machine obtained at DIS and announces the transmission mode of the sender. The

added data signals are as follows.

(Example)

Bit No.

DIS/DTC

Standard setting

DCS

Minimum scan line time

21, 22, 23 Minimum scan line time capability of the receiver

(0, 0, 0)

(0, 0, 1)

(0, 1, 0)

(1, 0, 0)

(0, 1, 1)

(1, 1, 0)

(1, 0, 1)

(1, 1, 1)

20 ms at 3.85 l/mm: T7.7 = T3.85

40 ms at 3.85 l/mm: T7.7 = T3.85

10 ms at 3.85 l/mm: T7.7 = T3.85

5 ms at 3.85 l/mm: T7.7 = T3.85

10 ms at 3.85 l/mm: T7.7 = 1/2 T3.85

20 ms at 3.85 l/mm: T7.7 = 1/2 T3.85

40 ms at 3.85 l/mm: T7.7 = 1/2 T3.85

0 ms at 3.85 l/mm: T7.7 = T3.85

20 ms

40 ms

10 ms

5 ms

0 ms

Extend field

2400 bit/s handshaking

Uncompressed mode

Error correction mode

Set to "0".

Error limiting mode

Reserved for G4 capability on PSTN

Unassigned

2400 bit/s handshaking

Uncompressed mode

Error correction mode

Frame size 0 = 256 octets 1 = 64 octets

Error limiting mode

Reserved for G4 capability on PSTN

Extend field

Recording width

Recording width indicated by bits 17, 18

Recording width indicated by this field bit

information

(0)

(1)

Validity of bits 17, 18

Bits 17, 18 are valid

Bits 17, 18 are invalid

Recording width capability 1216 picture elements along

scan line length of 151 ± mm 1%

Recording width capability 864 picture elements along

scan line length of 107 ± mm 1%

Recording width capability 1728 picture elements along

scan line length of 151 ± mm 1%

Recording width capability 1728 picture elements along

scan line length of 107 ± mm 1%

Middle 1216 elements of 1728 picture elements

Middle 864 elements of 1728 picture elements

Invalid

Reserved for future recording width capabilities.

Extend field

Semi super time / mm

Super time

Inch

MSC/SF

Select Polling

EXT

Extend field

Note 1 - Standard facsimile units conforming to T.2 must have the following capability: Index of cooperation (IOC)=264.

125

KX-FT21RS

Note 2 - Standard facsimile units conforming to T.3 must have the following capability: Index of cooperation (IOC)=264.

Note 3 - Standard facsimile units conforming to T.4 must have the following capability: Paper length=297 mm.

Signal

Identification Signal Format

———————

Function

Training 1

TCF

A fixed pattern is transmitted to the receiving side at a speed

(2400 to 9600 bps) designated by DCS, and the receiving side

optimizes the automatic equalizer, etc., according to this signal.

———————

Sends 0 continuously for 1.5 seconds at the same speed as the

training signal.

(Training Check)

CFR

X0100001

Notifies the sending side that TCF has been properly received. If

TCF is not properly received, FTT (Failure To Train) X0100010 is

relayed to the sender. The sender then reduces the transmission

speed by one stage and initiates training once again.

(Confirmation to Receive)

Training 2

Image Signal

RTC

———————

Refer to the next page.

———————

Used for reconfirming the receiving side like training 1.

———————

Sends 12 bits (0...01 × 6 times) to the receiver at the same speed

as the image signal and notifies completion of transmission of the

first sheet.

(Return to Control)

EOP

X1110100

X0110001

X1011111

X1110010

End of one communication

End of 1 page reception

Phase E starts.

(End of Procedure)

MCF

(Message Confirmation)

DCN

(Disconnect)

MPS

(Multi-Page Signal)

Completion of transmission of 1 page. If there are still more

documents to be sent, they are output instead of EOP. After MCF

reception, the sender transmits an image signal of the second

sheet.

PRI-EOP

(Procedural Interrupt-EOP)

PIP

X1111100

X0110101

If there is an operator call from the sender, it is output after RTC.

This is output when an operator call is received.

(Procedural Interrupt Positive)

126

KX-FT21RS

b. Redundancy Compression Process Coding Mode

This unit uses one-dimensional MH format.

127

KX-FT21RS

6.6.2.

MODEM CIRCUIT OPERATION

The ASIC (IC1) has all the hardware satisfying the ITU-T standards mentioned previously.

The modem is included in IC1. The signal communicates with the TEL line through the analog front end IC (IC5) of digital/analog,

analog/digital convertor. The modem in IC1 is operated using the 20.736 MHz (x2) clock.

1. Facsimile Transmission/DTMF Line Send

The digital image data on the data bus is modulated in the modem (IC1), and sent to analog front end (IC5) as the digital data,

then it is converted to the analog signal there. Passing through IC9 and IC6, the signal is sent to NCU section.

[IC1 → IC5 → IC5(3) → C48 → R37 → R38 → IC9 (2) → IC9 (1) → C53 → IC6 (2) → IC6 (1) → C58 → R49 → IC9 (6) → IC9

(7) → CN10 (1)] → CN202 (1) → C106 → R103 → R102 → T101 → C8 → Q4 (C) → Q4 (E) → D1 → TEL LINE

[ ]: Digital section

2. Facsimile Reception

The analog image data which is received from the telephone line passes through the NCU section and enters pin 15 of the

analog front end (IC5). The signals that enter pin 15 of the analog front end (IC5) convert the analog signals to the digital

signals, then the data is sent to the modem (IC1).

TEL LINE → D1 → Q4 (E) → Q4 (C) → C8 → T101 → R104 → C107 → R112 → IC101 (6) → IC101 (7) → C127 → IC103

(11) → IC103 (10) → CN102 (10) → [CN9 (10) → IC6 (10) → IC6 (11) → R33 → C43 → IC5 (15) → IC5 → IC1]

[ ]: Digital section

3. DTMF Transmission

The DTMF signal generated in the ASIC (IC1) is sent to the analog front end (IC5) to perform the digital/analog conversion, then

output from pin 3 of IC5, and is then sent to the circuit on the same route as used for facsimile transmission.

(DTMF Monitor Tone)

[IC1 → IC5 → IC5(3) → C48 → R37 → R38 → IC9 (2) → IC9 (1) → C54 → R44 → IC8 (2) → IC8 (1) → C27 → R13 → IC1

(62) → IC1 (63) →C62 → IC8 (5) → IC8 (7) → C67 → CN10 (9)] → CN202 (9) → R122 → IC102 (4) → IC102 (5) → SPEAKER

[ ]: Digital section

4. Call Tone Transmission

This is the call signal which is generated in the ASIC (IC1) and sent to the speaker.

[IC1 (59) → R28 → C45 → R35 → IC8 (2) → IC8 (1) → C27 → R13 → IC1 (62) → IC1 (63) → C62 → IC8 (5) → IC8 (7) →

C67 → CN10 (9)] → CN202 (9) → R122 → IC102 (4) → IC102 (5) → SPEAKER

[ ]: Digital section

5. Busy/Dial Tone Detection

The path is the same as FAX receiving.

128

R113

R15

C109

RLY1

C107

CN1

R112

R110

R104

R102

R12

LF1

IC101

SA1

R107

C111

R111

R103

R105

+5VD

C113

R13

T101

C106

C127

C105

R106

R109 R108

POS1

SA2

+24VD

PC1

IC103

LINETX

RELAY

C112

RLY1

BREAK

RELAY

C117

R117

Analog Board

LINERX

CN102

10 CN9

CN2

T102

C116

R116

C14

C126

To A

IC103

R16

R18

Digital Board

IC6

C13

Analog Front End

(IC5)

C12

MTX ENB

BELL

R19

PC5

MOM RX ENB

TEL RX ENB

HANDSET

CN201

R205 C207

L201

L204

R217

R212 C212

H/STX

C220

C214

_C206L202

L203

R204

C205

H/STX

MUTE

R206

R208

Q201

R209

10 H/SRX

C234

C209

H/SRX ENB

R207

SPEAKER

VOL

IC102

SP AMP

ASIC (IC1)

CN101

SPOUT

R232

R233

R234

R235

HOOK-IN

PAPER

C228

MODEM

CN202

SW202

SW201

C229

SP-MUTE

KX-FT21RS

6.8. NCU SECTION

6.8.1.

GENERAL

This section is the interface between the telephone line and external telephone. It is composed of an EXT. TEL Line relay (RLY1),

bell detection circuit, EXT TEL selection circuit, pulse dialing circuit, line amplifier, sidetone circuits and multiplexer.

6.8.2.

Line Relay (RLY1)

1. Circuit Operation

Normally, this relay switches to the external telephone side (Break) and switches to the open side (make) when the unit starts

facsimile communication.

[IC1 (99) High Level → CN9 (8)] → CN102 (8) → Q2 ON → RLY1 (make)

6.8.3.

BELL DETECTION CIRCUIT

1. Circuit Operation

The signal waveform for each section is indicated below. The signal (low level section) input to pin 56 of ASIC IC1 on the digital

board is read.

TEL LINE → PC5 (1, 2 - 4) → PC102(6) → [CN9(6) → R19 → IC1(56)]

6.8.4.

PULSE DIALIG

[IC1 (28) High Level → CN10 (4)] → CN202 (4) → Q3 ON → PC1 ON (make)

130

KX-FT21RS

6.8.5.

LINE AMPLIFIER AND SIDE TONE CIRCUITS

1. Circuit Operation

The reception signal received as output from line transformer T101 is given as input to R104, C107, R112, and IC101 (8).

Then it is input to the reception system at an amplifier gain of 5.9 dB from pin (7).

The transmission signal is input from CN202 pin (1), and output to the TEL line through C106, R103, R102 and T101. Without

a side tone circuit, the transmission signal would return to the reception amplifier via C106. Here, the signal output from CN202

pin (1) passes through R105, R106, R107, C111 and R110, and enters the amplifier IC101 pin (5). This is used to cancel the

return portion of the transmission signal. This is the side tone circuit.

131

KX-FT21RS

6.9. ITS (Integrated telephone System) and MONITOR SECTION

6.9.1.

GENERAL

During the monitor operation, the speaker output passes through the power amplifier (IC102) [Analog board].

The DTMF signal is output from the modem (IC1: digital board). The alarm tone, the key tone, bell tone, and beep are output from

gate array IC1 (digital board). During a pulse dial operation, the monitor tone is output from gate array IC1.

6.9.2.

MONITOR CIRCUIT

1. Function

This is the function when you are not holding the handset and can hear the caller´s voice from the line.

2. Circuit Operation

(Monitor Signal Path)

6.9.3.

HANDSET CIRCUIT

1. Transmission signal

2. Reception Signal

TEL LINE → D1 → Q4 (E) → Q4 (C) → C8 → T101 → R104 → C107 → R112 → IC101 (6) → IC101 (7) → C127 →

IC103 (11) → IC103 (10) → CN102 (10) → [CN9 (10) → IC6 (3) → IC6 (4) → C52 → R42 → IC8 (2) → IC8 (1) → C27 →

R13 → IC1 (62) → IC1 (63) → C62 → IC8 (5) → IC8 (7) → R60 → C63 → IC6 (8) → IC6 (9) → C65 → CN10 (10)] →

CN202 (10) → J402 → C234 → R209 → Q201 (B) → Q201 (E) → C205 → L202 → HANDSET SPEAKER

6.9.4.

MONITOR CIRCUIT

1. DTMF Monitor

(Monitor)

(Handset)

[IC1 → IC5 → IC5 (3) → C48 → R37 → R38 → IC9 (2) → IC9 (1) → C54 → R44 → IC8 (2) → IC8 (1) → C27 →

R13 → IC1 (62) → IC1 (63) → C62 → IC8 (5) → IC8 (7) → R60 → C63 → IC6 (8) → IC6 (9) → C65 → CN10 (10)] →

CN202 (10) → J402 → C234 → R209 → Q201 (B) → Q201 (E) → C205 → L202 → HANDSET SPEAKER

2. Alarm/Beep/Key tone/Bell

[IC1 (59) → R28 → C45 → R35 → IC8 (2) → IC8 (1) → C27 → R13 → IC1 (62) → IC1 (63) → C62 → IC8 (5) → IC8 (7) →

C67 → CN10 (9)] → CN202 (9) → R122 → IC102 (4) → IC102 (5) → SPEAKER

3. Dummy Ring Back Tone

Same with the modem signal transmission.

132

KX-FT21RS

6.10. EXT. TEL

EXT. TEL JACK is provided for the external TEL connection.

Connect the telephone to the EXT. TEL JACK. Because the unit (FT21) has the priority, EXT. TEL is disconnected when the unit

is OFF-HOOK.

1. EXT. TEL DC LOOP

(Signal Path)

b → POS1 → LF1 → RLY1 (3) → RLY1 (2) → L5 → EXT.TEL → L6 → RLY1 (7) → RLY1 (6) → LF1 → F1 → a

2. REMOTE RECEIVING

This is the parallel connection DTMF signal for the TEL or EXT. TEL mode between T and R. When the other party is a FAX,

the unit changes to FAX receiving.

133

R113

R15

C109

RLY1

C107

CN1

R112

R110

R104

R102

R12

LF1

IC101

SA1

R107

C111

R111

R103

R105

+5VD

C113

R13

T101

C106

C127

C105

R106

R109 R108

POS1

SA2

+24VD

PC1

IC103

LINETX

RELAY

C112

RLY1

BREAK

RELAY

C117

R117

Analog Board

LINERX

CN102

10 CN9

CN2

T102

C116

R116

C14

C126

To A

IC103

R16

R18

Digital Board

IC6

C43

C13

Analog Front End

(IC5)

R33

C12

MTX ENB

BELL

R19

PC5

MOM RX ENB

TEL RX ENB

HANDSET

CN201

R205 C207

L201

R217

R212 C212

H/STX

L204

L202

L203

C220

C214

R204

C206

C205

H/STX

MUTE

R206

R208

Q201

R209

10 H/SRX

C234

C209

H/SRX ENB

R207

SPEAKER

VOL

IC102

SP AMP

ASIC (IC1)

CN101

SPOUT

R232

R233

R234

R235

HOOK-IN

PAPER

C228

MODEM

CN202

SW202

SW201

C229

SP-MUTE

KX-FT21RS

6.11. OPERATION PANEL

The unit consists of an LCD (Liquid crystal display), KEYs, photo interrupters (sensor), and analog switches (for key scan).

The key scan (analog switch control, reading), sensor detection (sensor control, reading) and LCD control are all controlled by I/O

of ASIC (IC1) on the digital board.

Fig. a

6.11.1. KEY SCAN

When CN1(8) (OPSEL) is "H", the analog switch (IC1) is available. The "KLATCH", "KSCLK" and "KTXD" control the analog switch

(IC1) to read at KIN0~3.

Analog Switch (IC1) Control

KLATCH (A)

KSCLK (B)

ktxd (C)

Key Matrix

135

KX-FT21RS

6.11.2. SENSOR DETECTION

When CN1(8) (OPSEL) is "L", the detection of the document sensor and read start position sensor are available.

6.11.3. LCD CONTROL

"KTXD", "KSCLK", "KLATCH" and "KSTART" are sent as D4~D7 to control the LCD.

136

KX-FT21RS

6.12. POWER SUPPLY BOARD SECTION

This power supply board uses the switching regulator method.

[Input Circuit]

The input current goes into the input rectifier circuit through the filter circuit. The filter circuit decreases the noise voltage and the

noise electric field strength.

[Rectifier Circuit]

The input current is rectified by D101,D102,D103 and D104 and charges C106 to make DC voltage. Then it supplies power to the

converter circuit.

[Kick-on voltage circuit]

Bias is applied to the Q101 gate via this circuit when the AC power is turned on and Q101 begins operating.

137

KX-FT21RS

The following is an overview of how the power supply unit is controlled.

The control method of this power supply unit is pulse width modulation.

When Q₁is ON, the energy is charged in the transformer primary coil according to E₁. When Q₁is OFF, the energy is output from

the secondary transformer as follows.

L → D₁→ Load → L

Then the power is supplied to the Load. When Q₁is ON, power is not output from the secondary side. The output voltage is fed

back in the control IC according to the error amp rectifier. Then depending on how T_ONis controlled, stabilization occurs. Also, when

the current load becomes too large, in order to decrease the voltage output, the increase in

is stabilized.

is controlled and the output voltage

Therefore, basically the timing: Ton/Toff of Q1 controls the output voltage.

138

KX-FT21RS

[Surge Absorber Circuit]

This circuit is for absorbing surge voltage generated by the transformer.

[Control Circuit and Detecting Circuit]

The control circuit amplifies the output with increased voltage detected in the error detecting circuit. Then it drives the main

transistor.

In this power supply, the duty ratio is defined by changing the ON period of the main transistor.

This is shown as follows.

When the output voltage of the 24V circuit increases, the current of the photo coupler PC101 increases, the pulse width of the

output control IC becomes narrower and the ON period of Q101 becomes shorter.

[Over Current Limiter (O.C.L)]

The highest drain current (Q101) is limited by a limiter circuit (IC101) of 24V. The 24V output is limited by this circuit.

[Over Voltage Circuit]

If the 24V output increases because the error detecting circuit or control circuit is broken, IC101 will recognize this signal and output

becomes 0V.

Dummy load method (to quickly check the power supply output)

Refer to 2.3.4.5. Power Supply Board Section.

139

KX-FT21RS

7 FOR THE SCHEMATIC DIAGRAMS

Note:

1. DC voltage measurements are taken with an oscilloscope or a tester with a ground.

2. The schematic diagrams and circuit board may be modified at any time with the development of new technology.

140

KX-FT21RS

8 PRINTED CIRCUIT BOARD

8.1. PRINTED CIRCUIT BOARD (DIGITAL BOARD): COMPONENT VIEW

R101

IC2

R75

R70

C69 R67

R69

R68

R71

R72

R10

RA2

RA3

RA4

RA1

TP2

R66

C75

TP4

TP5

156

157

105

TP3

104

C28

L22

Q14

R34

R30

R63

R26

C44

R102

R103

IC1

L12

L10

L11

IC8

R29

R104

R13

L13

L14

R56

L15

208

R40

C62

C23

R99

C42

L20

IC4

CN8

R94

Q12

L19

IC6

C84

PIN1

PFUP1183ZA

141

KX-FT21RS

8.2. PRINTED CIRCUIT BOARD (DIGITAL BOARD): BOTTOM VIEW

C37

Q13

R19

C76

R74

C68

C30

C35

C71

C73

C74

C72

C70

C29

R73

C89

R113

R112

C21

C77

TP6

R12

C10

C88

C31

TP9

C80

R85

C26

R36

R87

R32

R24

TP7

TP8

R31

R33

R86

R65

R88

C86

R25

R59

C64

C25

R78

C87

C48

R77

R82

R37

L18

R98

C90

R43

R52

C92

C100

C78

R122

C46

C17

R51

R50

C14

C38

C41

R81

R27

C43

R111

R42

C52

R49

C59

C58

C13

R80

R79

L25

R130

R54

PFUP1183ZA

142

KX-FT21RS

8.3. PRINTED CIRCUIT BOARD (ANALOG BOARD): COMPONENT VIEW

PFUP1182ZA

CN102

CN202

R23

D203

T102

C120

C122

C123

R20

JP3

LF1

C13

JP7

C201

C12

JP20

PC3

PC2

D101

D102

JP30

R16

ZNR2

C213

JP5

C16

R15

CN201

CN1

CN2

C205

143

KX-FT21RS

8.4. PRINTED CIRCUIT BOARD (ANALOG BOARD): BOTTOM VIEW

PFUP1182ZA

C209

R209

L202

C202

R14

C233

Q201

C210

C216

R220

R207

R208

R11

R12

R13

R216

R219

C232

L201

L204

R221

C217

R101

C101

C241

C234

R223

R201

C240

R206

R123

C124

R10

R202

R214

R113

R203

R217

R213

C214

C203

C109

R114

C127

C119

C118

Q202

R112

C204

C207

R205

C108

R212

C14

R117

R210

C208

R118

C107

R104

C117

R103

R102

C102

C212

R120

R121

C121

R116

C116

C206

R110

C110

R204

R211

C211

R119

C103

C114

R227

C111

R107

R108

R109

R230

R111

C113

R105

R106

R107

C229

R231

C227

R218

C215

R115

C115

R17

R224

R225

C235

R250

R235

R234

C220

R226

C219

C112

C104

C218

C10

R251

R229

R252

C125

R124

C126

C224

J402

C223

C226

R233

R232

R22

J403

C222

R228

144

KX-FT21RS

8.5. PRINTED CIRCUIT BOARD (SWITCHING POWER SUPPLY)

(COMPONENT VIEW)

(BOTTOM VIEW)

SRF913EK

MITSUMI ELEC. CO., LTD.

CAUTION

FOR CONTINUED PROTECTION AGAINST RISK OF

FIRE. REPLACE ONLY WITH

SAME TYPE

68-4494A

CN31

T3.15AH 250V

AND

T3.15AH 250V

7694VÐ0

RATINGS

OF FUSE

( F101 )

F101

R101

F101

C101

L101

D104

D103

C103

D102

D101

C104

C106

C105

R123

C122

C121

R126

D109

R106

R121

Q101

C108

R104

C107

C109

D108

R108

C124

D105

R110

R128

R129

R130

R132

R131

PC101

PRIMARY

C202

D202

C221

R224

IC202

C201

D201

IC201

C224

R225

C205

C203

J10

CN301

C204

R205

24 G G G 5

CN301

145

KX-FT21RS

8.6. PRINTED CIRCUIT BOARD (OPERATION BOARD)

(COMPONENT VIEW)

(BOTTOM VIEW)

1 1

1 0

C N 1

J 1

J 4 7

J 4 6

J 3 8

J 3 4

J 3 5

J 3 0

J 9

J 2 8

J 8

R12

J 1 9

J 1 4

J 4 5

J 4 4

R19

R17

J 2 5

J 2 9

J 2

J 2 6

J 2 7

J 3 6

J 2 2

J 2 1

J 2 0

J 4 0

R30

D 1

R29 R27

R28

R31

R32

R33

R34

C 2

R10

R11

C 9

J 1 6

J 3 1

J 1 0

J 2 3

J 3 9

J 1 5

R13

J 3 7

J18

J 3 2

R15

R16

R20

R18

R14

146

KX-FT21RS

9 SCHEMATIC DIAGRAM

9.1. SCHEMATIC DIAGRAM (DIGITAL CIRCUIT)

CIS LED ARRAY

ON: 3.3V

OFF: 0V

3.3V

FAX TX signal

FAX RX signal

MOTOR ON: 3.3V

OFF: 0V

PRINTING

23~24V

PRINTING 3.3V

LATCH

DATA

CLOCK_5V

STB1

STB2

THERMAL

HEAD TEMP

WATCH DOG ERROR

5V (NORMAL)

0V (WATCH DOG ERROR OCCUR)

147

KX-FT21RS

9.2. SCHEMATIC DIAGRAM (ANALOG CIRCUIT)

FAX TX

FAX RX

LINE ON/OFF, DIALPULSE

3.3V

FAX RX, TEL TALK

BELL DETECT

2.1V

FAX RX, HANDSET TX

12V

NO PAPER: 5V

PAPER: 0V

148

KX-FT21RS

9.3. SCHEMATIC DIAGRAM (SWITCHING POWER SUPPLY)

540V

Cycle=13 s

12V

Cycle=13 s

T101

TRANS

TH101

CN301

24V

D105

D201

24V

GND

D102

D103

D101

D104

C202

1000p/(1KV)

D109

R105

R223

100

C205

Q101

1/(50V)

0.22/(2W)

R102 82K

IC201

C102

0.1

R103 82K

R122 390

R123 220

R133

150K

GND

C103

2200p

C104

R125

2200p

C121

IC202

D202

D108 R108

D107 10K

4700p

IC101

L101

ZNR101

750V

R101

R127 C124

1.8K 0.1

25V

1M 1/(2W)

Cycle=13 s

C101

0.22

GND

20V

11V

Cycle=13 s

PC101

CN31

48V

19V

36V

149

KX-FT21RS

9.4. SCHEMATIC DIAGRAM (OPERATION CIRCUIT)

KEY SCAN 0V

SENSOR SCAN 5V

OV/3.3V/5V

NO PAPER 0V

PAPER 5V

Read

position

sensor

Document

sensor

150

KX-FT21RS

10 TERMINAL GUIDE OF THE IC´S TRANSISTORS AND

DIODES

151

KX-FT21RS

11 FIXTURES AND TOOLS

152

KX-FT21RS

12 CABINET, MECHANICAL AND ELECTRICAL PARTS

LOCATION

12.1. OPERATION PANEL SECTION

153

KX-FT21RS

12.2. UPPER CABINET SECTION

154

KX-FT21RS

12.3. LOWER CABINET/P.C.B. SECTION

155

KX-FT21RS

12.4. MOTOR SECTION

Note:

Make sure that Gears 1, 2 and 3 are installed face up. (The product number is put on the face.)

156

KX-FT21RS

12.5. ACTUAL SIZE OF SCREWS AND WASHER

157

KX-FT21RS

13 ACCESSORIES AND PACKING MATERIALS

158

KX-FT21RS

14 REPLACEMENT PARTS LIST

Ref.

No.

Part No.

Part Name & Description

Remarks

This replacement parts list is for KX-FT21RS only.

Refer to the simplified manual (cover) for other areas.

PFJE1006Z

PFDE1096Z

PFDE1100Z

PFUV1024Z

PQDR9685Y

PFUS1171Z

PFDF1017Z

PFDJ1020Z

PFDN1033Z

LEAD, OPERATION

LEVER, DOCUMENT DETECTION

LEVER, READ DETECTION

COVER, OPERATION

ROLLER, SUPPORT

SPRING, ROLLER

Notes:

1. The marking (RTL) indicates that the Retention Time is

limited for this item.

After the discontinuation of this assembly in production, the

item will continue to be available for a specific period of

time. The retention period of availability is dependent on the

type of assembly, and in accordance with the laws

governing parts and product retention.

SHAFT

PLATEN SPACER, L

ROLLER, PLATEN

PFDG1123Z

PFHG1064Z

PFDE1101Z

PFUS1173Z

PFHX1251Z

PFDJ1021Z

PFBX1080Z1

PFBX1079Z1

PFBC1041Z1

PFUS1222Z

GEAR, PLATEN

SEPARATION RUBBER

LEVER, ADJUSTMENT

SPRING DOCUMENT FEED

READING SHEET

PLATEN SPACER, R

KEY, FUNCTION

KEY, 10

After the end of this period, the assembly will no longer be

available.

2. Important safety notice

Components identified by

characteristics important for safety. When replacing any of

these components, use only manufacture´s specified parts.

mark have special

KEY, START

SPRING, SLIDER

3. The S mark indicates service standard parts and may differ

from production parts.

(14.1.2.UPPER CABINET/

THERMAL HEAD SECTION)

4. RESISTORS & CAPACITORS

Unless otherwise specified;

All resistors are in ohms (Ω) K=1000Ω, M=1000kΩ

All capacitors are in MICRO FARADS (µF) P=µµF

*Type & Wattage of Resistor

PFKM1049Z1

PFHR1132Z

PFDE1098Z

PFJHS017Z

PFDE1099Z

PFBH1011Z1

PFJS11Q45Z

PFDJ1018Z

PFDN1032Z

PFDG1122Z

HANDSET CRADLE

COVER, HEAD

HEAD GUIDE, L

THERMAL HEAD

HEAD GUIDE, R

BUTTON, HOOK

CONNECTOR, 11PIN

ROLLER HOLDER

ROLLER DOCUMENT FEED

GEAR EXIT ROLLER

PFQT1503Z

PFUS1172Y

PFDE1102Z1

PFJS02Q64Z

PFAS50P003Z

PFUS1179Z

PFHE1019Z

PFUS1176Z

PFKM1048V1

PFHX1268Y

CAUTION LABEL

SPRING THERMAL HEAD

LEVER, LOCK

CONNECTOR, 2PIN

SPEAKER

SPRING, LOCK LEVER

IMASEN FORM

SPRING OPERATION COVER OPEN

MAIN CABINET

SHEET, IMASEN

PFUS1181Z

PFDJ1013Y

PFDN1034Z

PQUS10055Z

PFDE1059Z

PFDG1124Z

XUC2FY

SPRING, EARTH

SPACER, ROLLER

ROLLER, SEPARATION

SPRING, ONE WAY

SPACER

14.1. CABINET AND ELECTRICAL

PARTS

GEAR SEPARATION ROLLER

RETAINING RING

IMAGE SENSOR

PF0U1021Z

PFJE1005Z

PFGT1556Z-C

Ref.

No.

Part No.

Part Name & Description

Remarks

LEAD, IMAGE SENSOR

NAME PLATE

(14.1.1.OPERATION PANEL

SECTION)

PFQT1186Y

CAUTION LABEL

PFGP1140Z

PFGV1009Z

PFGD1043Z

PFBX1078Z1

PFKR1014Z1

PFUS1170

PANEL, LCD

COVER, TEL CARD

TEL CARD

(14.1.3. LOWER SECTION)

KEY, DIAL

100

101

102

103

104

105

106

107

PFMD1039Z

PFHA1001Z

PFJP03S04Z

PQLB1E1

FRAME, BOTTOM

LEG RUBBER

DOCUMENT GUIDE, L

SPRING, DOCUMENT LEVER

OPERATION PANEL

DOCUMENT GUIDE, R

GEAR, DOCUMENT GUIDE

AC INLET

PFGG1039X1

PFKR1015Z1

PFDG1015Y

FERRITE CORE

CONNECTOR, 2PIN

WASHER

PFJS02R19Y

XWC4B

PFUS1177Z

PFJS08R44Z

SPRING, EARTH

CONNECTOR, 8PIN

PFJE1007Z

LEAD, OPERATION

159

KX-FT21RS

Ref.

No.

Part No.

Part Name & Description

Remarks

Ref.

No.

Part No.

2SA933

Part Name & Description

Remarks

108

PFDE1097Z

PFUS1214Z

LEVER PAPER SENSOR

SPRING, EARTH

TRANSISTOR(SI)

109

2SC4155R

110

111

112

113

114

KR06TT251508 FFERRITE CORE

PQLB1E1 FFERRITE CORE

KR06TT251508 FFERRITE CORE

PQVTDTC114EU TRANSISTOR(SI)

2SB1322 TRANSISTOR(SI)

PQVTDTC114EU TRANSISTOR(SI)

PQHR136Z

CLAMPER

PFHX1340Z

BOTTOM PLATE SHEET

Q10

Q11

Q13

Q14

2SC4155R

TRANSISTOR(SI)

PFVTSI4431DY TRANSISTOR(SI)

PQVTDTC114EU TRANSISTOR(SI)

(14.1.4. GEAR CHASSIS

SECTION)

130

131

132

133

134

135

136

137

138

139

PFJQ1015Z

PFMH1069Z

PFDG1119Z

PFDE1095Z

PFUS1062Z

PFDG1021Z

PFDG1022Z

PFDE1094Z

PFDG1121Z

PQST2A04Z

MOTOR

MOTOR PLATE

GEAR, IDLER A

ARM, RX

(DIODES)

RLS71

DIODE(SI)

SPRING, GEAR C

GEAR C

PFVDRMRLS245 DIODE(SI)

MA7200

1SS131

DIODE(SI)

GEAR D

ARM, TX

GEAR, CAM

SENSOR, CAM

(BATTERY)

140

141

142

143

PFJS03Q43Z

PFUA1022Z

PFUS1169Z

PFDG1120Z

CONNECTOR, 3PIN

CHASSIS, GEAR

SPRING, ARM

BAT1

PQPCR2032H09 BATTERY

GEAR, IDLER B

(CONNECTORS)

14.1.5. ACCESSORIES AND

PACKING MATERIALS

CN3

CN4

CN5

CN6

CN7

CN8

CN9

CN10

PQJP5G30Y

PQJP11G100Z

PQJP2G30Y

PFJS06A13Z

PFJS11A13Z

PFJS10A13Z

PQJP10A19Z

CONNECTOR, 5P

CONNECTOR, 11P

CONNECTOR, 2P

CONNECTOR, 6P

CONNECTOR, 11P

CONNECTOR, 10P

PFJXE0801Z

PFJA1029Y

PQJA10075Z

PFUS1167Z

PQJA10038Y

PFQX1378Z

PFHP1063Z

PFQW1318Z

HANDSET

CURL CORD

TEL CORD

STACKER

POWER CORD

INSTRUCTION BOOK

RECORDING PAPER

LEAFLET

(FUSES)

FUSE

PFPE1060Z

PFPD1089Z

PFPN1187Z

PFPN1186Z

PQPP10005Z

PQPH97Z

PACKAGE ASS´Y

CUSHION

XBAPF001312

PFRB001251KC FUSE

PFRB002122KZ FUSE

CUSHION

BAG, POLYETHYLENE

SOFT SHEET

(COILS)

COIL

PQLQR1ET

14.2. DIGITAL BOARD PARTS

Ref.

No.

PQLQR1ET

COIL

L18

L19

L21

L22

R80

PQLQR1RM601

PQLQZK3R3K

Part No.

Part Name & Description

Remarks

PCB1

PFWP1FT21RS

DIGITAL BOARD ASS´Y (RTL)

(ICS)

PQLQR2KB113T COIL

IC1

IC2

IC3

IC4

IC5

IC6

IC7

IC8

IC9

PFVIT7E05

PFWIFT21RS

(COMPONENTS PARTS)

PFVIGM6256FF IC

PFVIS80842AN IC

PFVITC35133F IC

PFVIBU4066BF IC

RA1

RA2

RA3

RA4

PFXBV8V151JV COMPONENTS PARTS

PQVIBA12003

PQVINJM4558M IC

(CRYSTAL OSCILLATORS)

(TRANSISTORS)

TRANSISTOR(SI)

PFVC3276AZA

CRYSTAL OSCILLATOR

PFVC2073FZAT CRYSTAL OSCILLATOR

PFVBKB240ZAT CRYSTAL OSCILLATOR

2SB1197K

160

KX-FT21RS

Ref.

No.

Part No.

Part Name & Description

Remarks

Ref.

No.

Part No.

Part Name & Description

Remarks

R46

ERJ3GEYJ123

ERJ3GEYJ683

12k

68k

R49

(RESISTORS)

R51

R52

R53

R54

R56

R57

R58

R59

ERJ3GEYJ153

ERJ3GEYJ224

ERJ3GEYJ154

ERJ3GEYJ105

ERJ3GEYJ123

ERJ3GEYJ224

ERJ3GEYJ472

ERJ3GEYJ334

15k

ERJ3GEY0R00

ERJ6GEY0R00

ERJ8GEY0R00

220k

150k

12k

220k

4.7k

330k

ERJ3GEY0R00

ERJ3GEYJ471

R60

R62

R63

R64

R66

R67

R68

R69

ERJ3GEYJ562

ERJ3GEYJ393

ERJ3GEYJ821

ERDS1TJ222

ERJ3GEYJ563

ERJ3GEY0R00

ERJ3GEYJ101

5.6k

39k

820

2.2k

56k

470

100

L10

L11

L12

L13

L14

L15

L17

ERJ3GEYJ471

ERJ3GEY0R00

470

R70

R71

R72

R73

R74

R75

R77

R78

R79

ERJ3GEYJ101

ERJ3GEYJ153

ERJ3GEYJ203

ERJ3GEYJ562

ERJ3GEYJ472

ERJ3GEYJ102

ERJ3GEY0R00

100

15k

20k

5.6k

4.7k

L20

L25

ERJ3GEY0R00

ERJ8GEY0R00

R81

R82

R87

R88

R89

ERJ3GEYJ470

ERJ3GEYJ6R8

ERJ3GEYJ224

ERJ3GEYJ103

6.8

220k

10k

ERJ3GEYJ473

ERJ3GEY0R00

ERJ3GEYJ103

ERJ3GEYJ472

47k

10k

4.7k

R90

R91

R92

R93

R98

ERJ3GEYJ224

ERJ3GEYJ222

ERJ3GEYJ473

ERJ3GEYJ102

220k

2.2k

47k

R10

R11

R12

R13

R14

R17

R18

R19

ERJ3GEYJ151

ERJ3GEYJ102

ERJ3GEYJ222

ERJ3GEYJ123

ERJ3GEYJ222

ERJ3GEYJ122

150

R102

R103

R104

R105

R106

R107

R108

R109

ERJ3GEYJ821

ERJ3GEYJ102

820

2.2k

12k

2.2k

1.2k

R20

R21

R22

R24

R25

R26

R27

R28

R29

ERJ3GEYJ821

ERJ3GEYJ472

ERJ3GEYJ912

ERJ3GEYJ103

ERJ3GEYJ331

ERJ3GEYJ104

ERJ3GEYJ124

ERJ3GEYJ105

820

4.7k

9.1k

10k

R110

R111

R112

R113

R114

R115

R116

R117

R118

R119

ERJ3GEYJ102

ERJ3GEY0R00

ERJ3GEYJ471

ERJ3GEY0R00

10k

330

100k

120k

470

R30

R32

R33

R34

R35

R36

R37

R38

R39

ERJ3GEY0R00

ERJ3GEYJ103

ERJ3GEYJ102

ERJ3GEYJ105

ERJ3GEYJ563

ERJ3GEYJ103

ERJ3GEYJ243

ERJ3GEYJ753

10k

56k

10k

24k

75k

R120

R121

R122

ERJ3GEY0R00

R130

ERJ3GEYJ102

R40

R42

R43

R44

ERJ3GEYJ473

ERJ3GEYJ433

ERJ3GEYJ224

ERJ3GEYJ395

47k

43k

220k

3.9M

(CAPACITORS)

161

KX-FT21RS

Ref.

No.

Part No.

Part Name & Description

Remarks

Ref.

No.

Part No.

Part Name & Description

Remarks

ECUV1H104ZFV 0.1

ECUV1C104KBV 0.1

ECUV1H104ZFV 0.1

C83

ECUV1H104ZFV 0.1

C85

ECEA1HKS100

C90

C91

C92

ECUV1C104KBV 0.1

ECUV1H104ZFV 0.1

C10

C11

C12

C13

C14

C15

C17

C18

ECUV1H104ZFV 0.1

ECUV1H100DCV 10P

ECUV1H150JCV 15P

14.3. ANALOG BOARD PARTS

Ref.

No.

Part No.

Part Name & Description

Remarks

PCB2

PFLP1258RSZ

ANALOG BOARD ASS´Y (RTL)

ECUV1H102KBV 0.001

ECUV1H104ZFV 0.1

ECUV1H103KBV 0.01

(ICS)

C20

C21

C24

C26

C27

C28

C29

ECUV1H104ZFV 0.1

IC101

IC102

IC103

IC201

PFVINJM2904M IC

PQVINJM2113M IC

PQVITC4066BF IC

PFVINJM2904M IC

ECEA1CK101

100

ECUV1H104ZFV 0.1

PQCUV1C224KB 0.22

ECUV1H104ZFV 0.1

ECUV1H100DCV 10P

(TRANSISTORS)

PQVTDTC143E

2SA1627

TRANSISTOR(SI)

C30

C31

C32

C33

C34

C35

C36

C37

C38

C39

ECUV1H104ZFV 0.1

PQCUV1C224ZF 0.22

2SC2235

Q201

2SC4155R

ECEA1CK101

PQCUV1E104MD 0.1

ECEA1CK101 100

100

(DIODES)

PQCUV1E104MD 0.1

ECUV1H221JCV 220P

ECUV1H220JCV 22P

PFVDDGS1ZB60 DIODE(SI)

1SS131

DIODE(SI)

C40

C41

C42

C43

C44

C45

C46

C47

C48

C49

ECEA1HKS100

D101

D102

D103

D104

MA4056

1SS131

DIODE(SI)

ECUV1H104ZFV 0.1

ECUV1H102KBV 0.001

ECUV1C104KBV 0.1

ECUV1H150JCV 15P

ECUV1C104KBV 0.1

ECUV1H104ZFV 0.1

ECUV1H220JCV 22P

ECUV1C104KBV 0.1

ECUV1H220JCV 22P

D201

D202

1SS131

DIODE(SI)

(CONNECTORS)

C50

C51

C52

C53

C54

C55

C56

C58

ECUV1H222KBV 0.0022

ECUV1H221JCV 220P

ECUV1C104KBV 0.1

ECUV1H222KBV 0.0022

ECUV1H104ZFV 0.1

ECUV1H182KBV 0.0018

ECUV1C104KBV 0.1

CN101

CN102

CN202

PQJP02G100Z

PQJS10A10Z

CONNECTOR, 2P

CONNECTOR, 10P

(JACKS)

C60

C61

C62

C63

C64

C65

C66

C67

ECUV1C104KBV 0.1

ECUV1H151JCV 150P

PQCUV1C474KB 0.47

PQCUV1H151JC 150P

PQCUV1C474KB 0.47

ECUV1C104KBV 0.1

ECUV1C473KBV 0.047

CN1

PFJJ1T01Z

PQJJ1TB18Z

JACK

CN2

CN201

(COILS)

PQLQR2BT

COIL

PQLQR2BT

C74

C75

C76

C77

C78

C79

ECUV1H222KBV 0.0022

ECUV1H561JCV 560P

ECUV1E473KBV 0.047

ECUV1C104KBV 0.1

ECUV1H102KBV 0.001

PQLQZK330K

L201

L202

L203

L204

PQLQR2BT

COIL

ECEA1CK101

100

C80

C82

ECUV1H104ZFV 0.1

PQCUV1E224MD 0.22

LF1

PFLE003

COIL

162

KX-FT21RS

Ref.

No.

Part No.

Part Name & Description

Remarks

Ref.

No.

Part No.

Part Name & Description

Remarks

R107

ERJ3GEYJ623

ERJ3GEYJ121

ERJ3GEYJ122

62k

120

R108

R109

1.2k

(PHOTO ELECTRIC TRANSDUCERS)

R110

R111

R112

R113

R114

R115

R116

R117

R118

R119

ERJ3GEY0R00

ERJ3GEYJ823

ERJ3GEY0R00

ERJ3GEYJ823

ERJ3GEYJ222

ERJ3GEYJ223

ERJ3GEYJ333

ERJ3GEYJ114

ERJ3GEYJ154

PC1

PQVIPS2532-1 PHOTO ELECTRIC TRANSDUCER

82k

PC5

PQVIPC814K

PHOTO ELECTRIC TRANSDUCER

82k

2.2k

22k

33k

110k

150k

(THERMISTOR)

THERMISTOR

POS1

RLY1

PFRT002

(RELAY)

RELAY

R120

R121

R122

R124

ERJ3GEY0R00

ERJ3GEYJ103

ERJ3GEYJ153

ERJ3GEYJ473

ATXD20328

10k

15k

47k

(VARISTORS)

R201

R202

R203

R204

R205

R206

R207

R208

R209

ERJ3GEYJ331

ERJ3GEYJ152

ERJ3GEYJ153

ERJ3GEY0R00

ERJ3GEYJ331

ERJ3GEYJ473

ERJ3GEYJ822

330

1.5k

15k

SA1

SA2

PQVDRA311PT3 VARISTOR

PFRZ001Z

VARISTOR

(SWITCHES)

330

47k

8.2k

SW201

SW202

PFSH1A03Z

ESE14A211

SWITCH

R210

R211

R212

R217

R218

ERJ3GEYJ154

ERJ3GEYJ562

ERJ3GEYJ153

ERJ3GEYJ823

150k

5.6k

15k

(TRANSFORMERS)

T101

T102

PFLT8E003

PFLT8E004

TRANSFORMER

82k

R225

ERJ3GEY0R00

(VARISTORS)

R230

R231

R232

R233

R234

R235

ERJ3GEYJ103

ERJ3GEYJ622

ERJ3GEYJ472

ERJ3GEYJ101

ERJ3GEYJ472

ERJ3GEYJ101

10k

ZNR1

ZNR2

ERZVA7D121

VARISTOR

6.2k

4.7k

100

4.7k

100

(RESISTORS)

C214

C219

C234

ERJ3GEY0R00

R250

R251

R252

ERJ3GEYJ222

2.2k

J402

J403

J404

ERJ3GEY0R00

ERJ8GEY0R00

(CAPACIT0RS)

ERJ3GEYJ222

ERDS1TJ561

ERJ3GEYJ821

ERDS2TJ104

ERDS2TJ222

2.2k

560

ECKD2H681KB

680P

820

ECUV1H102KBV 0.001

PQCUV1H472KB 0.0047

100k

2.2k

ECEA1HKS4R7

ECEA1CKS100

4.7

R12

R13

R15

R17

R18

R19

PQ4R10XJ123

PQ4R10XJ562

ERDS1TJ330

ERJ3GEYJ333

ERDS1TJ473

12k

5.6k

C12

C13

C14

ECQE2E224JZ

ECQE2E104KZ

PQCUV1H105JC

0.22

0.1

33k

47k

C101

C105

C106

C107

C109

ECUV1H102KBV 0.001

PQCUV1C224KB 0.22

R22

ERJ3GEYJ104

100k

ECEA1HKS4R7

4.7

ECUV1C104KBV 0.1

ECUV1H330JCV 33P

R102

R103

R104

R105

R106

ERJ3GEYJ102

ERJ3GEY0R00

ERJ3GEYJ623

ERJ3GEYJ471

ERJ3GEYJ122

62k

470

1.2k

C111

C112

C113

ECUV1C104KBV 0.1

PQCUV1C224KB 0.22

ECUV1H330JCV 33P

163

KX-FT21RS

Ref.

No.

Part No.

Part Name & Description

Remarks

Ref.

No.

Part No.

PFAVM190

Part Name & Description

LIQUID CRYSTAL DISPLAY

Remarks

C114

ECUV1C104KBV 0.1

CN3

C115

C116

C117

ECUV1H332KBV 0.0033

ECUV1H103KBV 0.01

ECUV1H102KBV 0.001

(PHOTO ELECTRIC TRANSDUCERS)

C120

C121

C122

C125

C126

C127

ECEA1CK101

ECUV1H102KBV 0.001

ECEA1HKS4R7 4.7

100

PS1

PS2

CNA1006N

PHOTO ELECTRIC TRANSDUCER

ECUV1C104KBV 0.1

PQCUV1C474KB 0.47

(RESISTORS)

C201

C202

C203

C204

C205

C206

C207

C208

C209

ECEA1EK470

J18

J30

ERJ3GEY0R00

ERDS1TJ470

ECUV1H103KBV 0.01

ERJ3GEYJ103

10k

ECEA1CKS100

ECUV1C104KBV 0.1

ECUV1H471JCV 470P

ECUV1H472KBV 0.0047

R10

R11

R12

R13

R14

R15

R16

R17

R18

R19

ERJ3GEYJ103

ERJ3GEYJ271

ERJ3GEYJ563

ERJ3GEYJ103

ERJ3GEYJ471

ERJ3GEYJ103

ERJ3GEYJ471

ERJ3GEYJ103

ERJ3GEYJ471

ERJ3GEYJ103

10k

270

56k

10k

470

10k

470

10k

470

10k

C211

C212

C213

C215

ECUV1H471JCV 470P

ECUV1H223KBV 0.022

ECEA1CK101

100

ECUV1H560JCV 56P

C220

C226

C227

C228

C229

ECUV1C104KBV 0.1

ECUV1H103KBV 0.01

R20

R21

R28

R30

ERJ3GEYJ471

ERJ3GEY0R00

ERJ3GEYJ103

ERJ3GEYJ681

470

C231

C232

C233

C235

ECEA1EK470

ECUV1H103KBV 0.01

ECUV1C104KBV 0.1

10k

680

C240

PQCUV1H102J

0.001

(CAPACITORS)

ECUV1H104ZFV 0.1

ECEA1AKS221 220

ECUV1C224ZFV 0.22

14.4. OPERATION BOARD PARTS

Ref.

No.

Part No.

Part Name & Description

Remarks

PCB3

PFLP1196BXZ

OPERATION BOARD ASS´Y (RTL)

(SWITCHES)

(IC)

SW1

SW2

SW3

SW5

SW6

SW7

SW8

EVQ11Y05B

SPECIAL SWITCH

IC1

PQVIMC4051BF IC

(TRANSISTORS)

PQVTDTA143EU TRANSISTOR(SI)

SW10

SW11

SW12

SW13

SW14

SW15

SW16

SW17

SW18

SW19

EVQ11Y05B

SPECIAL SWITCH

(DIODES)

1SS131

DIODE(SI)

(CONNECTORS)

SW20

SW21

SW22

SW23

SW24

SW25

EVQ11Y05B

SPECIAL SWITCH

CN1

PFJS11A13Z

CONNECTOR, 11PIN

(LIQUID CRYSTAL DISPLAY )

164

KX-FT21RS

Ref.

No.

Part No.

Part Name & Description

Remarks

Ref.

No.

Part No.

Part Name & Description

Remarks

SW26

EVQ11Y05B

SPECIAL SWITCH

R123

PQ4R10XJ221

PQ4R10XJ103

PQ4R10XJ562

PQ4R10XJ182

PQ4R10XJ124

220

10k

SW27

SW28

SW29

R125

R126

R127

R128

R129

5.6k

1.8k

120k

SW30

EVQ11Y05B

SPECIAL SWITCH

R130

R131

R132

R133

PQ4R10XJ154

150k

14.5. POWER SUPPLY BOARD

PARTS

Ref.

No.

Part No.

Part Name & Description

Remarks

R205

ERG2SJ681

680

PCB5

PFLP1227EZL

POWER SUPPLY BOARD ASS´Y

(RTL)

R221

R222

R223

R224

R225

PQ4R10XJ222

PQ4R10XJ101

PQ4R10XJ273

PQ4R10XJ332

2.2k

100

(ICS)

27k

3.3k

IC101

IC201

IC202

PFVIFA5317P

AN1431T

(PHOTO ELECTRIC TRANSDUCERS)

PHOTO ELECTRIC TRANSDUCER

PFVITA7805F

PC101

0N3171

(TRANSISTORS)

TRANSISTOR(SI)

(CAPASITORS)

Q101

2SK2651

C101

C102

C103

C104

C105

C106

C107

C108

C109

ECQU2A224MG

ECQU2A104MV

ECKNTS222ME

0.22

0.1

0.0022

(DIODES)

D101

D102

D103

D104

D105

D106

D107

D108

D109

PFVD1N4005

PFVDEG01C

MA165

DIODE(SI)

PFCEA400SX56 56

ECKD3A470KBP 47P

ECKD3A102KBP 0.001

ECA1VHG470

47P

C121

C122

C123

C124

ECUV1H472KBN 0.0047

ECUV1C224KBX 0.22

PQCUV1H681JC 680P

ECUV1H104KBW 0.1

MA4220

PQVDERA1802

PQVDERA1506

D201

D202

PFVDSF5LC20U DIODE(SI)

C201

C202

C203

C204

C205

EEUFA1V471

470

PFVDD1NL20U

DIODE(SI)

ECKD3A102KBP 0.001

PFCEA16A1000 1000

PFCEA35A47M

PFCEA50A1M

(CONNECTORS)

CN31

PQJP2D98Z

PQJP8G30Z

CONNECTOR, 2PIN

CONNECTOR, 8PIN

CN301

(FUSE)

(COIL)

F101

L103

VR201

PFBAHU215315 FUSE

L101

PFLES11V0523 COIL

(COMPONENTS PARTS)

(RESISTORS)

EXCELDR35

COMPONENTS PARTS

PQ4R10XJ000

R101

R102

R103

R104

R105

R106

R107

R108

R109

R110

ERDS1J1105

PQ4R10XJ823

ERG2DJ204

82k

200k

0.22

(VARIABLE RESISTOR)

EVNDJAA03B53 VARIABLE RESISTOR

(VARISTOR)

ERX2SJR22

ERG1SJ470

PQ4R10XJ680

ERDS2FJ150

ERDS2FJ100

ERG2DJ204

ZNR101 ERZV10DK751U VARISTOR

200k

R121

R122

PQ4R10XJ103

PQ4R10XJ391

10k

390

165

KX-FT21RS

Ref.

No.

Part No.

Part Name & Description

(OTHERS)

Remarks

T101

TH101

ETS29AK428AC TRANSFORMER

PFRRT09L8R2F THERMISTOR

14.6. FIXTURES AND TOOLS

Ref.

No.

Part No.

Part Name & Description

Remarks

EC1

PQZZ8K18Z

PFZZ13K1Z

PFZZ5K13Z

PFZZ11K13Z

PQZZ2K1Z

PFZZ6K1Z

PFZZ11K14Z

PFZZ2K2Z

PQZZ2K1Z

PFZZ2K2Z

CONNECTOR, 8P

CONNECTOR, 13P

CONNECTOR, 5P

CONNECTOR, 11P

CONNECTOR, 2P

CONNECTOR, 6P

CONNECTOR, 11P

CONNECTOR, 2P

EC2

EC3

EC4

EC5

EC6

EC7

EC8

EC9

EC10

KM79811245C0 BASIC FACSIMILE TECHNIQUE

(for training service

technicians)

Notes:

Tools and Extension Cords are useful for servicing.

(They make servicing easy.)

Y(Q) KXFT21RS

Printed in Japan

166

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