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Cat. No.
43-971
OWNER’S MANUAL
Please read before using this equipment.
System 420
Call Waiting
Caller ID
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FEATURES
Your RadioShack System 420 Call Waiting Caller ID offers the
latest in telephone technology. The system displays the cur-
rent date and time, and call information as provided by your lo-
cal phone company.
The system has these features:
Caller ID Memory
— stores and displays up to 99 incoming
phone numbers, or up to about 51 incoming names and phone
numbers (actual capacity depends on information sent).
Call Waiting
— the NEW CALL indicator flashes and the dis-
play shows incoming caller information when you are on the
phone.
Message Waiting
— the NEW CALL indicator flashes and
the display shows that you have a message when someone
records a message on your voice mail service.
Caller ID Memory Dial
— lets you select a stored phone
number from Caller ID memory, then dial it with the touch of a
button.
VIP Call List with Distinctive Ring
— lets you store the
phone numbers and names of up to 20 important callers and
set the system to ring with a distinctive tone when they call.
Review Scrolling
— lets you easily scroll through all call
records in Caller ID memory.
Large Liquid Crystal Display
— displays three full lines of
information, including the time the call came in.
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Note: Your system requires two AAA batteries (not supplied)
to protect its memory during a power outage.
This system has been tested and found to comply with all ap-
plicable UL and FCC standards.
Important Information:
• To use the System’s Caller ID, message waiting, and call
waiting features, you must be in an area where Caller ID,
message waiting, and call waiting services are available,
and you must subscribe to those services.
• Where Caller ID is offered, one or more of the following
options are generally available:
–
–
–
Caller’s number only
Caller’s name only
Caller’s name and number
For your System 420’s Caller ID memory dial feature to
operate, you must receive the caller’s number.
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READ THIS BEFORE INSTALLATION
Your Caller ID system conforms to federal regulations, and
you can connect it to most telephone lines. However, each de-
vice that you connect to the phone line draws power from the
phone line. We refer to this power draw as the device’s ringer
equivalence number, or REN. The REN is shown on the bot-
tom of your system.
If you are using more than one phone or other device on the
line, add up all the RENs. If the total is more than five, your
phone might not ring. In rural areas, a total REN of three
might impair ringer operation. If ringer operation is impaired,
remove a device from the line.
FCC STATEMENT
Your system complies with Part 68 of FCC Rules. You must,
upon request, provide the FCC Registration Number and the
REN to your phone company. These numbers are on the label
on the bottom of the system.
Note:
You must not connect your system to:
• Coin-operated systems
• Party-line systems
• Most electronic key telephone systems
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CONTENTS
Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Installing Batteries . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Connecting the AC Adapter . . . . . . . . . . . . . . . . . . . . 10
Resetting the System . . . . . . . . . . . . . . . . . . . . . . . . . 11
Connecting to the Phone Line . . . . . . . . . . . . . . . . . . 12
Connecting to a Single Phone Line . . . . . . . . . . 12
Connecting to a Two-line Phone . . . . . . . . . . . . . 13
Connecting to an Answering Machine . . . . . . . . 14
Setting the Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Adjusting the Display Contrast . . . . . . . . . . . . . . . . . . 16
Storing Your Local Area Code . . . . . . . . . . . . . . . . . . 17
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Receiving and Storing Calls . . . . . . . . . . . . . . . . . . . . 18
New Calls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Call Waiting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Message Waiting . . . . . . . . . . . . . . . . . . . . . . . . 19
Repeat Messages . . . . . . . . . . . . . . . . . . . . . . . . 20
Long Distance Calls . . . . . . . . . . . . . . . . . . . . . . 20
Forwarded Calls . . . . . . . . . . . . . . . . . . . . . . . . . 20
Out of Area Calls . . . . . . . . . . . . . . . . . . . . . . . . 21
Private Calls . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Line Error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Name- or Number-Only Calls . . . . . . . . . . . . . . . 23
Call Records . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Reviewing Call Records . . . . . . . . . . . . . . . . . . . 23
Dialing Numbers in Call Records . . . . . . . . . . . . 24
Deleting Call Records . . . . . . . . . . . . . . . . . . . . . 25
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VIP Call List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Storing Call Records in the VIP Call List . . . . . . 27
Turning On/Off the VIP Call Special Ring . . . . . 28
Reviewing and Deleting VIP Call Records . . . . . 28
Dialing from the VIP Call List . . . . . . . . . . . . . . . 29
Care and Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . 30
The FCC Wants You to Know . . . . . . . . . . . . . . . . . . 31
Lightning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
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PREPARATION
INSTALLING BATTERIES
Your system uses two AAA batteries to maintain information
in memory during power failures. For the longest operation
and best performance, we recommend you use alkaline bat-
teries such as RadioShack Cat. No. 23-555.
Cautions:
• Use only fresh batteries of the recommended size and
type.
• Do not mix old and new batteries, different types of bat-
teries (standard, alkaline, or rechargeable), or recharge-
able batteries of different capacities.
• When you replace the batteries, have fresh batteries on
hand before you begin. You must install fresh batteries
immediately after removing the old batteries; otherwise,
you might lose the information stored in the system.
• When you replace the batteries, do not press any but-
tons on the system after you remove the old batteries.
Doing so might erase all stored information from the sys-
tem.
• Never leave dead or weak batteries in the system. Bat-
teries can leak chemicals that can destroy electronic cir-
cuits.
• Dispose of old batteries promptly; do not bury or burn
them.
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1. Make sure the system is unplugged from the telephone
line and AC power.
2. Use a Phillips screwdriver to remove the screw in the
battery compartment cover on the bottom of the system,
then remove the cover.
3. Insert fresh batteries into the compartment as indicated
by the polarity symbols (+ and –) marked inside the com-
partment.
4. Replace the cover and secure it with the screw.
Note: When
appears on the display or the display dims,
replace the batteries.
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CONNECTING THE AC ADAPTER
The AC adapter must be connected for the System 420 to op-
erate.
Note:
You must also keep batteries in the system to protect
the information stored in memory during power failures.
Cautions:
• You must use an AC adapter that supplies 9 volts DC
and at least 50 milliamps. Its center tip must be set to
negative, and its plug must correctly fit the system’s DC
9V jack. The supplied adapter meets these specifica-
tions. Using an adapter that does not meet these specifi-
cations could damage the system or the adapter.
• Always connect the AC adapter to the system before you
plug it into the AC outlet, and unplug the adapter from
the AC outlet before you unplug it from the system.
Follow these steps to connect the supplied AC adapter.
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1. Insert the AC adapter’s barrel plug into the DC 9V jack on
the back of the system.
2. Plug the other end of the AC adapter into a standard AC
outlet.
RESETTING THE SYSTEM
Before you use the system the first time or to reset the sys-
tem’s clock any time, use a pointed object, such as a straight-
ened paper clip, to press RESET on the back of the system.
12-00-00A appears. This resets the clock and the area
code; it does not clear any stored call information.
Note: If the system does not work after you reset it, remove
the batteries (this clears all stored call information), disconnect
the system from the phone line and the AC outlet, replace the
batteries with fresh ones (if necessary), then reconnect it and
try resetting it again.
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CONNECTING TO THE PHONE LINE
The System 420 Call Waiting Caller ID connects to a modular
wall jack and your telephone. If your telephone wiring does
not have a modular wall jack, you can update the wiring your-
self. RadioShack stores sell jacks and adapters necessary to
convert older wiring methods to modular wiring. Or, you can
have the telephone company update your telephone wiring
for you. The USOC number of the jack to be installed is
RJ11C (for a single-line phone) or RJ14C (for a two-line
phone).
Note:
For proper Call Waiting operation, connect only one
System 420 to a phone line. (If two or more systems with Call
Waiting are on a single phone line, the Call Waiting signal
can be garbled or not received.) Other Caller ID systems that
do not have the Call Waiting function can be connected to the
same phone line.
Connecting to a Single Phone Line
Follow these steps to connect the system to a single phone
line.
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1. Unplug the existing telephone’s modular cord from the
modular phone jack and plug this cord into the system’s
PHONE jack.
2. Plug one end of the supplied modular cord into the sys-
tem’s TEL. LINE jack.
3. Plug the other end of the cord into the modular wall jack.
Connecting to a Two-line Phone
To record information about calls received on a two-line
phone, you can connect two systems using a triplex adapter
(Cat. No. 279-402). Each system only records information
about calls received on the line to which it is connected.
Follow these steps to connect two systems to a two-line
phone.
1. Unplug the existing telephone’s modular cord from the
modular phone jack and plug it into L1 + L2 on the triplex
adapter.
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2. Plug the triplex adapter into the modular phone jack.
3. Plug one end of the supplied modular cord into the TEL.
LINE jack on one of the systems.
4. Plug the other end of the modular cord into either L1 or
L2 on the triplex adapter.
5. Repeat Steps 3 and 4 to connect another system to the
remaining open jack (L1 or L2) on the triplex adapter.
Connecting to an Answering Machine
1. Unplug the answering machine’s modular cord from its
line jack and plug this cord into the system’s TEL. LINE
jack.
2. Plug one end of the supplied modular cord into the sys-
tem’s PHONE jack, then plug the other end of the cord
into the answering machine’s line jack.
3. Set the answering machine to answer calls after at least
two rings.
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SETTING THE TIME
When no call records are displayed, the system displays the
time. The telephone company sets the time with each incom-
ing call; however, you can also set the time yourself. Follow
these steps to manually set the time.
1. When the system displays the time, press and hold
READ until the time flashes on display.
2. Press REVIEW
to set the hour.
3. Press REVIEW
to set the minute.
4. Press READ to store the setting.
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ADJUSTING THE DISPLAY CONTRAST
1. Repeatedly press MODE until the system displays
CALLER ID MODE.
2. Press either REVIEW button. The system displays the
total number of stored calls.
3. Press and hold READ for about 6 seconds. The system
shows CONTRAST:XX.
4. Press REVIEW
to increase the contrast (up to 15) or
to decrease it (down to 00).
REVIEW
5. Press READ to store the setting.
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STORING YOUR LOCAL AREA CODE
You must store your local area code in the system so it does
not dial the area code when it dials/redials a local call. Follow
these steps to store your area code.
1. Repeatedly press MODE until the system displays
(AREA CODE):___.
2. Press REVIEW
or REVIEW
to set the first digit.
3. Press READ to store the selected digit, the next digit
flashes.
4. Repeat Steps 2–3 to set the next two digits.
5. Press MODE to store the area code.
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OPERATION
RECEIVING AND STORING CALLS
The system displays the current time and date as sent by the
telephone company each time it receives a Caller ID record.
The system also automatically displays all received Caller ID
information for every incoming call, including the call’s time
and date. As it receives calls, it stores the information in the
system’s memory for later recall. The most recent call is #01.
When the system’s memory becomes full, the oldest messag-
es are deleted to make room for new messages.
New Calls
If the system has received a call since the last time call infor-
mation was reviewed (see “Reviewing Call Records” on
Page 23),
and the latest call information appear on the
display and the NEW CALL indicator flashes. After about 20
seconds, the call information is replaced by the time display.
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Call Waiting
If you are using the telephone when a new call comes in, the
system displays the new call information, and the NEW CALL
indicator flashes.
Message Waiting
If you have a voice-mail message waiting (if you subscribe to
the telephone company’s message waiting service), the NEW
CALL indicator flashes and -MESSAGE-appears on the dis-
play. -MESSAGE-remains on the display until you retrieve
the message.
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Repeat Messages
If you have received a call from the same phone number more
than once, Xappears showing the number of repeat calls
(up to 7).
Long Distance Calls
The system displays L-D-Cwith each long distance call.
Forwarded Calls
The system displays CALL-Fdinstead of the phone number
if the call was forwarded to you from a number set to forward
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all calls (using the phone company’s call forwarding service).
It displays CALL-FdBUSYif the call was forwarded from a
number set to forward calls if the line is busy.
To see the telephone number of the original caller, press
READ.
Out of Area Calls
The system displays –OUTOFAREA–when:
• The call originates from an area or long-distance carrier
that does not support Caller ID.
• The call is an operator-assisted call.
• The call was made using a calling card.
Note: This list might not include all instances that cause -OUT
OFAREA–to appear.
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Private Calls
In some areas, callers have the option of blocking their Caller
ID information. When a caller has blocked Caller ID, the sys-
tem displays –PRIVATECALL–instead of the call informa-
tion.
Line Error
If there is an error in the Caller ID information transmission,
-LINEERROR- appears on the display.
Note: Minor electrical disturbances can affect the caller ID in-
formation. Occasional errors are normal. If the system fre-
quently displays -LINE ERROR-, contact your local
telephone company for assistance with the phone line or your
local RadioShack store for assistance with the Caller ID sys-
tem.
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Name- or Number-Only Calls
If the Caller ID information provided includes only the name or
only the number, the system displays dashes for the missing
information.
CALL RECORDS
Reviewing Call Records
To see how many calls are stored, press REVIEW
or
when the system displays the time. The system displays the
number of stored call records.
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Note: If the display does not show the time, repeatedly press
MODE until the system displays CALLERIDMODE before
you press REVIEW
or
.
To view individual call records, press REVIEW
to step
back through the calls or REVIEW
to step forward through
them.
Notes:
• If no call information is stored, the system displays NO
CALLwhen you press REVIEW or
.
• If you do not press a button within 30 seconds, the sys-
tem automatically returns to the time display.
• If a stored phone number is more than 12 characters,
press READ to see the rest of the phone number.
Dialing Numbers in Call Records
Follow these steps to dial a number stored in a call record.
1. Lift your telephone’s handset.
2. Display the Caller ID record that has the phone number
you want to dial (see “Reviewing Call Records” on
Page 23).
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3. Press DIAL/REDIAL. The system dials the number.
Notes:
•
The system cannot dial a number if the Caller ID
record is name only.
•
If the call’s area code matches the area code you
stored in the system, the system does not dial the
area code.
Deleting Call Records
You can select and delete individual call records, or all call
records stored in the system.
Note: When the system’s memory is full, it automatically de-
letes the oldest call record as a new call comes in.
Follow these steps to select and delete a single call record.
1. Display the Caller ID record you want to delete (“Review-
ing Call Records” on Page 23).
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2. Press DELETE twice. The system deletes that record and
automatically renumbers the remaining call records.
After 30 seconds, the time reappears.
Note: If you do not press DELETE twice within 30 sec-
onds, the system automatically returns to the current
time display.
Follow these steps to delete all call records.
1. Press either REVIEW
or
when the system dis-
plays the time. The system displays the number of stored
call records.
2. Press and hold DELETE until the system displays NO
CALL(about 6 seconds). All records are deleted.
VIP CALL LIST
Your system lets you save up to 20 phone numbers in its VIP
call list area. Whenever your system detects a call from one of
those 20 numbers, it sounds a special ring to alert you, once
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you turn this feature on (see “Turning On/Off the VIP Call Spe-
cial Ring” on Page 28).
Storing Call Records in the VIP Call List
Note: The number you store in the VIP call list must be in a
Caller ID record. If necessary, call the person you want to add
and ask them to call you back so you can store the record.
1. Display the Caller ID record that has the phone number
you want to store (see “Reviewing Call Records” on
Page 23).
2. Press VIP INDEX twice to move the displayed call record
to the VIP call list. The VIP record number appears on
the display. After 30 seconds, the current time appears.
Notes:
• If you try to place more than 20 call records in the VIP
call list, the system displays MEMORYFULL.
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• If you do not press a button within 30 seconds, the sys-
tem automatically returns to the current time display.
Turning On/Off the VIP Call Special Ring
1. Repeatedly press MODE until the system displays either
VIPCALLONor VIPCALLOFF.
2. Press READ to switch between the two options.
Reviewing and Deleting VIP Call Records
1. Repeatedly press MODE until the system displays VIP
CALLMODE.
Note: If there are no call records stored in the VIP call
list, the system displays NOVIPCALL.
2. Press REVIEW
or
. The system displays the
number of stored VIP call records.
To delete all entries from the VIP call list, while the sys-
tem displays the number of VIP records, press and hold
DELETE until the system displays NOVIPCALL.
3. Repeatedly press REVIEW
or
. The system dis-
plays the VIP call records stored in the VIP call list.
To delete an individual record from the list, while the sys-
tem displays the record, press DELETE twice within 1
second.
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Notes:
• If you do not press a button within 30 seconds, the sys-
tem automatically returns to the current time display.
• If a phone number has more than 12 characters, press
READ to see the rest of the phone number.
Dialing from the VIP Call List
1. Lift your telephone’s handset.
2. Select a VIP call record in the VIP call list, then press
DIAL/REDIAL. The system dials the number.
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CARE AND MAINTENANCE
Your RadioShack System 420 Call Waiting Caller ID is an ex-
ample of superior design and craftsmanship. The following
suggestions will help you care for your system so your can en-
joy it for years.
• Keep the system dry. If it gets wet, wipe it dry immedi-
ately. Liquids can contain minerals that corrode the elec-
tronic circuits.
• Use and store the system only in normal temperature
environments. Temperature extremes can shorten the
life of electronic devices, damage batteries, and distort or
melt plastic parts.
• Handle the system gently and carefully. Dropping it can
damage circuit boards and cases and cause the system
to work improperly.
• Keep the system away from dust and dirt, which can
cause premature wear of parts.
• Wipe the system with a damp cloth occasionally to keep
it looking new. Do not use harsh chemicals, cleaning sol-
vents, or strong detergents to clean your system.
Modifying or tampering with the system’s internal components
can cause a malfunction and might invalidate its warranty and
void your FCC authorization to operate it. If your system is not
performing as it should, take it to your local RadioShack store
for assistance. If the trouble is affecting the phone lines, the
phone company might ask you to disconnect your system until
you have resolved the problem.
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THE FCC WANTS YOU TO KNOW
In the unlikely event that your system causes problems on the
phone line, the phone company can temporarily disconnect
your service. If this happens, the phone company attempts to
notify you as soon as possible and advises you of your right
file a complaint with the FCC.
Also, the phone company can make changes to its lines,
equipment, operations, or procedures that could affect the op-
eration of the system. The phone company notifies you of
these changes in advance, so you can take the necessary
steps to prevent interruption of you phone service.
LIGHTNING
Your system has built-in protection circuits to reduce the risk
of damage from surges in phone line or power line current.
These protection circuits meet or exceed FCC requirements.
However, lightning striking the phone line can damage your
system.
Lightning damage is not common. However, if you live in an
area that has severe electrical storms, we suggest that you
unplug your system during storms to reduce the possibility of
damage.
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RadioShack Limited Warranty
This telephone product is warranted against manufacturing defects in
material and workmanship for one (1) year from the date of purchase
from RadioShack company owned stores and authorized RadioShack
franchisees and dealers. Within this period bring your RadioShack
sales slip as proof-of-purchase date to any RadioShack store.
This warranty does not cover damage or failure caused by or attribut-
able to Acts of God, abuse, misuse, improper or abnormal usage,
faulty installation, improper maintenance, lightning or other incidence
of excess voltage, or any repairs other than those provided by a
RadioShack Authorized Service Facility, or transportation costs.
RadioShack is not responsible or liable for indirect, special, or
consequential damages arising out of or in connection with the
use or performance of the product or other damages with respect
to loss of property, loss of revenue or profit, or costs of removal,
installation or reinstallation.
EXCEPT AS PROVIDED HEREIN, RadioShack MAKES NO
EXPRESS WARRANTIES AND ANY IMPLIED WARRANTIES ARE
LIMITED IN DURATION TO THE DURATION OF THE WRITTEN LIM-
ITED WARRANTIES CONTAINED HEREIN. Some states do not allow
the limitation or exclusion of incidental or consequential damages and
some states do not allow limitation or exclusion of implied warranties;
therefore, the aforesaid limitation(s) or exclusion(s) may not apply to
the purchaser. There will be charges rendered for repairs to the prod-
uct made after the expiration of the aforesaid one (1) year warranty
period.
This warranty gives you specific legal rights and you may also have other rights
which vary from state to state.
We Service What We Sell
10/95
RadioShack
A Division of Tandy Corporation
Fort Worth, Texas 76102
2A7
Printed in Hong Kong
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