ACER AL1706 User Manual

Acer AL1706

Service Guide

Conventions

The following conventions are used in this manual

Screen Messages

NOTE

Denotes actual messages that appear on

screen.

Give bits and pieces of additional

information related to the current topic.

WARNING

CAUTION

Alerts you to any damage that might result

from doing or not doing specific actions.

Gives precautionary measures to avoid

possible hardware or software

problems.

IMPORTANT

Reminds you to do specific actions relevant

to the accomplishments of procedures.

Preface

Before using this information and the product it supports, please read the following

general information.

1. This Service Guide provides you with all technical information relating to the BASIC

CONFIGURATION decided for Acer’s “global” product offering. To better fit local

market requirements and enhance product competitiveness, your regional office MAY

have decided to extend the functionality of a machine (e.g. add-on card, modem, or extra

memory capability). These LOCALIZED FEATURES will NOT be covered in this

generic service guide. In such cased, please contact your regional offices or the

responsible personnel/channel to provide you with further technical details.

2. Please not WHEN ORDER FRU PARTS, that you should check the most up-to-date

information available on your regional web or channel. If, for whatever reason, a part

number change is made, it will not be noted in the printed Service Guide. For

ACER-AUTHORIZED SERVICE PROVIEDERS, your Acer office may have a

DIFFERENT part number code to those given in the FRU list of this printed Service

Guide. You MUST use the list provided by your regional Acer office to order FRU parts

for repair and service of customer machines.

WARNING (FOR FCC CERTIFIED MODELS)

NOTE: This equipment has been tested and found to comply with the limits for a Class B

digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide

reasonable protection against harmful interference in a residential installation. This

equipment generates uses and can radiate radio frequency energy, and if not installed and

used in accordance with the instructions, may cause harmful interference to radio

communications. However, there is no guarantee that interference will not occur in a

particular installation. If this equipment does cause harmful interference to radio or

television reception, which can be determined by turning the equipment off and on, the

user is encouraged to try to correct the interference by one or more of the following

measures:

1. Reorient or relocate the receiving antenna.

2. Increase the separation between the equipment and receiver.

3. Connect the equipment into an outlet on a circuit different from that to which the

receiver is connected.

4. Consult the dealer or an experienced radio/TV technician for help.

Notice:

1. The changes or modifications not expressly approved by the party responsible for

compliance could void the user’s authority to operate the equipment.

2. Shielded interface cables and AC power cord, if any, must be used in order to comply

with the emission limits.

3. The manufacturer is not responsible for any radio or TV interference caused by

unauthorized modification to this equipment. It is the responsibility of the user to correct

such interference. As an ENERGY STAR Partner our company has determined that this

product meets the ENERGY STAR guidelines for energy efficiency.

WARNING:

To prevent fire or shock hazard, do not expose the monitor to rain or moisture. Dangerously

high voltages are present inside the monitor. Do not open the cabinet. Refer servicing to

qualified personnel only

PRECAUTIONS

ꢀ

Do not use the monitor near water, e.g. near a bathtub, washbowl, kitchen sink, laundry tub, swimming pool or in a wet

basement.

ꢀ

Do not place the monitor on an unstable trolley, stand, or table. If the monitor falls, it can injure a person and cause

serious damage to the appliance. User only a trolley or stand recommended by the manufacturer or sold with the

monitor. If you mount the monitor on a wall or shelf, use a mounting kit approved by the manufacturer and following

the kit instructions.

ꢀ

Slots and openings in the back and bottom of the cabinet are provide for ventilation. To ensure reliable operation of the

monitor and to protect it from overheating, be sure these openings are not blocked or covered. Do not place the monitor

on a bed, sofa, rug, or similar surface. Do not place the monitor near or over a radiator or heat register. Do not place the

monitor in a bookcase or cabinet unless proper ventilation is provided.

ꢀ

The monitor should be operated only from the type of power source indicated on the label. If you are not sure of the

type of power supplied to your home, consult your dealer or local power company.

The monitor is equipped with a three-pronged grounded plug, a plug with a third (grounding) pin. This plug will fit

only into a grounded power outlet as a safety feature. If your outlet does not accommodate the three-wire plug, have an

electrician install the correct outlet, or use an adapter to ground the appliance safely. Do not defeat the safety purpose of

the grounded plug.

ꢀ

Unplug the unit during a lightning storm or when it will not be used for long periods of time. This will protect the

monitor from damage due to power surges.

ꢀ

Do not overload power strips and extension cords. Overloading can result in fire or electric shock.

Never push any object into the slot on the monitor cabinet. It could short circuit parts causing a fire or electric shock.

Never spill liquids on the monitor.

ꢀ

Do not attempt to service the monitor yourself; opening or removing covers can expose you to dangerous voltages and

other hazards. Please refer all servicing to qualified service personnel.

To ensure satisfactory operation, use the monitor only with UL listed computers which have appropriate configured

receptacles marked between 100-240V AC, Min. 3.5A.

The wall socket shall be installed near the equipment and shall be easily accessible.

SPECIAL NOTES ON LCD MONITORS

The following symptoms are normal with LCD monitor and do not indicated a problem.

NOTES

ꢀ

Due to the nature of the fluorescent light, the screen may flicker during initial use. Turn off the Power Switch and then

turn it on again to make sure the flicker disappears.

ꢀ

You may find slightly uneven brightness on the screen depending on the desktop pattern you use.

The LCD screen has effective pixels of 99.99% or more. It may include blemishes of 0.01% or less such as a missing

pixel or a pixel lit all of the time.

ꢀ

Due to the nature of the LCD screen, an afterimage of the previous screen may remain after switching the image, when

the same image is displayed for hours. In this case, the screen is recovered slowly by changing the image or turning off

the Power Switch for hours.

Table of Contents

Chapter 1 Monitor Features

Monitor Features……………………………………………………………………

Factory Preset Timing Table……………………………………………………..

Monitor Block Diagram……………………………………………………………

Interface Board Diagram………………………………………………………….

Software Flow Chart……………………………………………………………….

Interface Board PCB Layout……………………………………………………..

Front Bezel………………………………………………………………………….

Rear Cover………………………………………………………………………….

Chapter 2 Operating Instruction

Front Bezel Control………………………………………………………………..

Adjusting the Monitor……………………………………………………………..

How to Optimize the DOS-Mode…………………………………………………

Chapter 3 Machine Assembly

Chapter 4 Troubleshooting

Common Acknowledge……………………………………………………………

Interface Board Troubleshooting………………………………………………..

QPI PCBA Troubleshooting……………………………………………………….

Chapter 5 Connector Information

VGA Connector Pin Assignment…………………………………………………

Chapter 6 FRU (Field Replaceable Unit)

Exploded Diagram…………………………………………………………………..

Part List……………………………………………………………………………….

Chapter 7 Schematic Diagram

MONITOR FEATURES

Driving System

TFT Color LCD

LCD Panel

Size

17”

Pixel pitch

0.264mm (H) x 0.264mm (V)

140ﾟ(H), 140 ﾟ(V)

270cd/m²(typ.)

Viewable angle

Brightness

Contrast Ratio

Response Time

Video

500:1 (typ.)

12ms (typ.)

Signal

RGB Analog Interface (Analog only model)

H/V TTL

Separate Sync.

H-Frequency

V-Frequency

31.5KHz to 60.241KHz

56Hz to 75Hz

Display Color

6bits+FRC

Dot Clock

80MHz

Max. Resolution

Plug & Play

1024 x 768 @75Hz

VESA DDC 1/2B

< 35W

EPA ENGERGY STAR

ON MODE

OFF MODE

<1W

Input Connector

D-Sub 15pin

Three-Pronged Pin

Analog: 0.7Vp-p (Standard), 75 OHM,

Positive (Analog-Only Model)

338 mm

Input Video Signal

Maximum Screen Size

Horizontal

Vertical

270 mm

Power Source

100~240VAC, 50~60Hz

Operating Temp: 5℃ to 40℃

Storage Temp: -20℃ to 60℃

Operating Humidity: 5% to 95%

3.7Kg

Environmental Considerations

Weight (Net)

Dimension

343.4 (W) x 351.4 (H) x 159.8 (D) mm

External Controls

Switch

Power Switch Menu

Auto

Function

Contrast/Brightness Phase/Clock H. Position/ V. Position

Color (Warm, Cool, User) Language OSD (H. Position, V.

Position, Timeout) Auto Config Information

Reset

Exit

Regulatory Compliance

UL, CSA, TUS+GS, CG, PSB, B-MARK, PSE, Ergo, FCC, BSMI,

VCCI, C-Tick, TCO99, CCC, WHQL

FACTORY PRESET TIMING TABLE

Standard

Resolution

640 x 480

800 x 600

1024 x 768

1280 x 1024

640 x 350

720 x 400

832 x 624

1024 x 768

Horizontal Frequency (KHz)

Vertical Frequency (Hz)

60.000

VGA

31.469

37.861

37.500

35.156

37.879

48.077

46.875

48.363

56.476

60.023

63.981

79.976

31.469

31.470

49.725

48.780

60.241

72.809

75.000

SVGA

XGA

56.250

60.317

72.188

75.000

60.004

70.069

75.029

SXGA

IBM

60.020

75.025

70.087

70.080

MAC

74.551

60.001

74.927

Monitor Block Diagram

The LCD monitor contains 4 parts:

1. interface board: Deal with VGA input signal and output the signal to panel.

2. Power/inverter board: Provide power to interface board and panel

3. Keypad board: For user to control the LCD monitor.

4. Flat panel:

Flat panel (LVDS interface) and CCFL

Inverter/Power BD

Interface Board (VGA input)

(Including AC/DC

Power Supply and

Inverter)

Keypad BD

AC input

Host computer

Range 90V~264V

(VGA signal input and DDC)

MAIN BOARD DIAGRAM

Interface Board

Red

A/D

Green

Blue

LCD

module

Scaling

Vsync

Hsync

OSD

SCL

SDA

MCU

DDC

Software Flow Chart

ACER 17” flow chart item description:

(1)

1. MCU initialize.

(2)

(3)

2. Is the EEProm blank?

3. Program the EEProm by default values.

4. Get the user value and mode setting from EEProm.

5. Are the factory key pressed?

(4)

6. Enter factory mode.

(5)

(6)

(8)

7. Check the analog port, are there any signal coming?

8. Display “No Signal” message.

9. Enter sleep mode.

(7)

10. Wake up the scalar.

11. Program the scalar to be able to show the coming mode.

12. Turn on the LED and set it to green color.

13. Process the OSD display

(10)

(9)

(11)

(12)

(13)

14. Read the keyboard. Is any key pressed?

(14)

MONITOR INTERFACE BOARD PCB LAYOUT

Symbol:

Component:

CN103

CN101

U102

LVDS connector

Connector to power BD

5V to 1.8V regulator

Crystal to scaler

Scaler “TSU16AK”

MCU “Winbond”

D-sub connector

DDC

X102

U104

U105

CN102

U103

U106

EEPROM

X101

Crystal to MCU

Connector to control BD

5V to 3.3V regulator

CN105

U101

FRONT BEZEL

5 4 3 2

DESCRIPTION

ITEM

Power Tack Switch

Menu/Enter

> (Up)

< (Down)

Auto/Exit

REAR BEZEL

ITEM

DESCRIPTION

Three-pronged power cord

VGA Cable with blue connector compliance with PC99

Chapter 2

OPERATION INSTRUCTIONS

Press the power button to turn the monitor on or off. The other control buttons are located on the front of the monitor. By

changing these settings, the picture can be adjusted to your personal preferences.

ꢀ

The power cord should be connected.

Connect the video cable from the monitor to the VGA Card.

Press the power button to turn on the monitor, the power indicator will light up.

Front Panel Control

5 4 3 2

Symbol

Function

Press this button to turn the monitor on or off

LED Green – Power On mode

Power key/LED

LED Orange – Off mode

Activate OSD menu when OSD is off or activate/de-activate adjustment function when

OSD is ON or Exit OSD menu when in Volume Adjust OSD status.

1. Activates the volume control when the OSD is OFF.

2. Navigate through adjustments icons when OSD is ON.

3. Adjust a function when function is activated.

Menu/Enter

1. Activates the volume control when the OSD is OFF.

2. Navigate through adjustments icons when OSD is ON.

3. Adjust a function when function is activated.

1. When OSD menu is in active status, this button will act as EXIT (exit OSD menu)

2. When OSD menu is in off status, press this button for 2seconds to activate the “Auto

Adjustment” which is used to set the H.Pos., V Pos., Clock and Phase.

Auto/Exit

NOTES

ꢀ

Do not install the monitor in a location near heat sources such as radiators or air ducts, or in a place subject to direct

sunlight, or excessive dust or mechanical vibration or shock.

ꢀ

Save the original shipping carton and packing materials, as they will come in handy if you ever have to ship your

monitor.

ꢀ

For maximum protection, repackage your monitor as it was originally packed in the factory.

To keep the monitor looking new, periodically clean it with a soft cloth. Stubborn stains may be removed with a cloth

lightly dampened with a mild detergent solution. Never use strong solvents such as thinner, benzene, or abrasive

cleaners, since these will damage the cabinet. As a safety precaution, always unplug the monitor before cleaning it.

ADJUSTING THE MONITOR

1.) Main OSD Menu

a. Outline

b. Description for OSD

Main

Sub Menu

Item

Sub Menu

Icon

Adjustment

Range

Description

Reset Value

Menu Icon

Contrast

Brightness

Phase

Contrast from digital register

0-100

Backlight Adjustment

100

Adjust picture phase to reduce

horizontal line noise

Adjust picture clock to reduce

vertical line noise

Do auto config

Do Auto Config

Clock

H. Position

Adjust picture horizontal

position

V. Position

Warm

Adjust picture vertical position

0-100

N/A

Do Auto Config

N/A

Recall warm color temp. from

EEPROM

N/A

Cool

Recall cool color temp. from

EEPROM

N/A

User/Red

User/Green

User/Blue

Red gain from digital register

0-100

The value which we get after

executing Auto color balance

Green gain from digital register

Blue gain from digital register

English

N/A

Set OSD language to English

Set OSD language to Traditional

Chinese

N/A

English

繁體中文

N/A

Deutsch

Francais

Espanol

Italiano

N/A

Set OSD language to German

Set OSD language to French

Set OSD language to Spain

Set OSD language to Italian

Set OSD Language to Simplified

Chinese

N/A

簡體中文

日本語

N/A

Set OSD language to Japanese

Adjust OSD horizontal position

N/A

H. Position

0-100

V. Position

Adjust OSD vertical position

Adjust the OSD timeout

0-100

N/A

OSD

Timeout

Auto Config N/A

Auto adjust the picture’s H/V

position, clock and phase

N/A

Information

Reset

N/A

Show the current input timing

mode’s resolution, H/V

frequency

N/A

Memory Recall

Exit

N/A

Exit OSD

N/A

2) OSD MESSAGE

a. Outline

b. OSD Message Description

Item

Description

No Signal

When LCD Monitor power on, but video cable is not connected, will show this

message, then enter power saving.

3) FACTORY MENU

a. How to call out “Factory Menu”

At VGA in, Push “AUTO” & “MENU”, and plug AC Power cord in sync..

b. Outline

HOW TO OPTIMIZE THE DOS-MODE

PLUG AND PLAY

Plug & Play DDC1/2B Feature

This monitor is equipped with VESA DDC1/2B capabilities according to the VESA DDC STANDARD. It allows the monitor

to inform the host system its identity and, depending on the level of DDC used, communicate additional information about its

display capabilities. The communication channel is defined in two levels, DDC1 and DDC2B.

The DDC1 is a unidirectional data channel from the display to the host that continuously transmits EDID information. The

DDC2B is a bidirectional data channel based on the I²C protocol. The host can request EDID information over the DDC2B

channel.

THIS MONITO WILLAPPEAR TO BE NON-FUNCTIONAL IF THERE IS NO VIDEO INPUT SIGNAL. IN

ORDER FOR THIS MONITOR OT OPERATE PROPERLY, THERE MUST BE A VIDEO INPUT SIGNAL.

This monitor meets the Green monitor standards as set by the Video Electronics Standards Association (VESA) and/or the

United States Environmental Protection Agency (EPA) and the Swedish Confederation Employees (NUTEK). This feature is

designed to conserve electrical energy by reducing power consumption when there is no video-input signal present. When

there is no video input signal this monitor, following a time-out period, will automatically switch to an OFF mode. This

reduces the monitor’s internal power supply consumption. After the video input signal is restored, full power is restored and

the display is automatically redrawn. The appearance is similar to a “Screen Saver” feature except the display is completely

off. The display is restored by pressing a key on the keyboard, or clicking the mouse.

USING RIGHT POWER CORD

The accessory power cord for the Northern American region is the wallet plug with NEMA 5*15 style and is UL listed and

CSA labeled. The voltage rating for the power cord shall be 125 volts AC.

Chapter 3

MACHINE ASSEMBLY

This chapter contains step-by-step procedures on how to assemble the monitor for maintenance

and troubleshooting.

NOTE:

1. The screws for the different components vary in size. During the disassembly process, collect the screws with the

corresponding components to avoid mismatch when putting back the components.

2. The monitor surface is susceptible to scratching! Therefore, lay the monitor on a soft surface when mounting or

removing the base.

3. Wear gloves

Chassis*1

INL Panel*1

Back cover*1

Stand plate*1

Rubber*4

SCREW (PW3x4,M,ZN)*4

FFC(30pin)*1

PCBA Power Board *1

INSULATOR PC,MYLAR

SCREW (PW 3*6,M,ZN) *3

TAPE,ACE#LP1701(40x20mm)*1

INSULATOR PC#LE1710

Hinge cover*1

Arm Stand*1

(M4x10,ZN)*4

PCBA I/F BOARD *1

CABLE 30P FFC

HRN ASS’Y 8P

SCREW (PW 3*6,M,ZN) *3

Insert B/L jack*4

EMI shield Tape*2

Front bezel*1

Button*1

Bracket Finger

Indicator*1

PCBA Control Board *1

SCREW (PW 3*4,M,ZN)

Chassis*1

PCBA Control Board *1

SCREW (PW 3*4,M,ZN) *2

Insert B/L jack*4

PCBA Power Board *1

INSULATOR PC,MYLAR

SCREW (PW 3*6,M,ZN) *3

INL Panel*1

EMI shield Tape*2

SCREW (PW3x4,M,ZN)*4

FFC(30pin)*1

PCBA I/F BOARD *1

CABLE 30P FFC

HRN ASS’Y 8P

TAPE,ACE#LP1701(40x20mm)*1

INSULATOR PC#LE1710

SCREW (PW 3*6,M,ZN) *3

Panel Module *1

Back cover*1

Arm Stand*1

(M4x10,ZN)*4

Bracket Finger*1

(M4x18,ZN)*3

Stand plate*1

Rubber*4

Hinge Cover

Front Bezel *1

Button *1

Indicator *1

TROUBLESHOOTING

Chapter 4

1. Common Acknowledge

If you change the M/B, Please re-do “DDC” programmed &”Auto Color balance”

If Replace “Power & Inverter board” only, please re-do “Auto color balance”.

If you adjust clock and phase, please do it at condition of Windows shut down pattern.

If you confirm the R.G.B. color is normal or not, please do it under 16-grey scalar pattern.

This LCM is analog interface. So if the entire screen is an abnormal color that means the problem

happen in the analog circuit part, if only some scale appears abnormal color that stand the problem

happen in the digital circuit part.

If you check the H/V position, please use the crosshatch pattern.

This LCM support 20 timing modes, if the input timing mode is out of specification, the picture

appears abnormally.

“Auto Color Balance”- Press “>” and “<” together and plug in AC power cord at the same time at

VGA cable in.

2. QPI PCBA Troubleshooting

2.1 No Power & Power LED Off

No power

&LED off

YES

Check primary

rectifier voltage

Check IC802,

C805, T801

Check circuit if short

YES

Check

F801, F802,

P801, D801

YES

Check R801,

R805, R822,

R823, R817

Check pin3 of IC802

voltage about 1V

YES

Check R803,

R807, R824,

R825

Check pin2 of IC802

voltage about 2V

YES

Check pin1 of IC802

voltage is 5.8V

Check R812,

R816, C818

YES

END

2.2 DC output voltage is unstable

Output Voltage

Unstable

Check ZD801,

ZD802, ZD803,

D803, D805

Check Vbe of 801

below 0.3V

Check circuit if short

YES

Check Q801,

Q802

YES

Check R809,

R814, IC801,

R818

Check reference

voltage

Check pinR of IC801

YES

Check R810,

R811

YES

Check C815,

D806, R812

Check feedback

circuit

Check Vpin3-4 of

IC801 about 6V

YES

Check Vpin1-2 of IC801

about 1V

YES

Check

R809, R814

END

2.3 Output power is unstable

Unstable power

Check

Change R810,

R811, R818

Check R810,

R811,R818

sampling

Circuit

YES

Check the R pin

Check the C pin

voltage of IC803

Change IC803

about 2.5V

YES

Check

R809, R808,

R814, D809

YES

Check pin1 of

Check D806,

C815 if short

IC802 voltage is

5.8V

Change

D806,

C815

YES

Change R801,

R805, R822,

R823, R817

Check pin3 of

IC802 voltage

about 1V

YES

END

2.4 Backlight can’t be turned on

No raster

YES

LED Green?

YES

Backlight can

not be turned on

F501 open

YES

Is there 12Vdc

voltage on pin13 of

IC501?

Check power

supply

Is Ok fuse F501?

YES

Is there high-level

voltage on pin8 of

IC501

Is R526 Ok?

Check I/F board

R526 open

YES

Connecting the

output connector

again

Check CN501, CN502,

CN503 and CN504?

YES

Is there pulse waveform on pin1,

pin3, pin15 and pin16 of IC501 at the

moment of restart?

Is Ok IC501?

U501, U502 fail

YES

IC501 fail

T501, T502 fail

Is ok T501, T502?

YES

Check protected

circuit Q501, Q502,

Q503, Q504

END

3.Interface Board Troubleshooting

3.1 Black Screen and backlight turn on

Black screen

Check power

supply:pin 1,2 of

CN101

Power fail

YES

Check

FB108,R131,R132,

R133

Check pin30,31,35,44

of U105(MCU)

YES

Check reset (pin 10)

of U105

Check

C150,D102,R137

YES

Check crystal(pin20,21)

waveform of U105

Check

X101,C154,C155

YES

Check CCFL-

Enable(pin3)

of U105

Check pin5 of

CN101

Inverter Fail

Check

R105,R106,R157,

C114,Q103

MCU Fail

3.2 White Screen

White screen

LVDS Cable

Reinsert

Workmanship

Change

LVDSCable

LVDS cable NG

Check VLCD

is 5V

Check LVDS

signal

Panel Fail

Check the

HWRESET of

U104 exists

Check Panel-Enable of

U105(pin2) is low

Check RP101

Check

Q101,Q102,Q107,

R103

Check the pins of

U105

END

3.3 Bad Screen

Bad Screen

LVDS Cable

Reinsert

Workmanship

Change LVDS

Cable

LVDS Cable NG

(1).CheckX101,C154,

C155

(2).CheckX102,C126,

C168

Check Crystal:

pin20,21 of U105 and

pin33,34 of U104

Check ALE/RDZ/

WRZ/AD0/AD1/

AD2/AD3/

Check the

communication of

U104 andU105

HWRESET

Check the pins of

U104 and U105

3.4 If brightness uniform, change Inverter or Panel.

3.5 If you find the vertical line on the screen, please change panel.

Exploded Diagram

Process To Access Factory Mode

Power Off

Press “AUTO＂& ＂MENU＂buttons at

the same time

Power On

Release the “AUTO＂& ＂MENU＂

buttons

Press “MENU＂ Button

Press “<＂ Button

Press “Menu＂ Button

Enter the factory Mode

Chapter 5

ONNECTOR INFORMATION

VGA Connector (D-Sub 15pin) Pin Assignments

Symbol

Red

Symbol

Red_GND

Green_GND

Blue_GND

PC+5V

N.C.

Green

Blue

DDC_SDA

HSYNC

VSYNC

DDC_SCL

N.C.

GND

N.C.

Chapter 6

FRU (Field Replaceable Unit) LIST

This chapter gives you the FRU (Field Replaceable Unit) listing in global configuration of AL1513. Refer to this chapter

whenever ordering for parts to repair or for RMA (Return Merchandise Authorization).

NOTE: Please not WHEN ORDER FRU PARTS, that you should check the most up-to-date information available on your

regional web or channel (http://aicsl.acer.com.tw/spl/). For whatever reasons a part number change is made, it will not be

noted in the printed Service Guide. You MUST use the local FRU list provided by your regional Acer office ot order FRU

parts for repair and service of customer machines.

Note: To scrap or to return the defective parts. You should follow the local government ordinance or regulations on how best

to dispose it, or follow the rules set by your regional Acer office on how to return it.

PART LIST