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CORDLESS TELEPHONE
SERVICE MANUAL
FILE NO. 2B0-9905
FT-8989
PUBLISHED IN JAPAN, Sep., 1999


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1
CONTENTS
SAFETY PRECAUTIONS ............................................................................................................ 1
OPERATING CONTROLS ........................................................................................................... 2
ALIGNMENT PROCEDURE ........................................................................................................ 3
BLOCK DIAGRAMS ..................................................................................................................... 9
SCHEMATIC DIAGRAMS .......................................................................................................... 12
TROUBLESHOOTING HINTS ................................................................................................... 18
IC AND TRANSISTOR VOLTAGE CHART ............................................................................... 25
SEMICONDUCTOR LEAD IDENTIFICATION ........................................................................... 32
ELECTRICAL PARTS LOCATION ............................................................................................. 35
WIRING DIAGRAMS .................................................................................................................38
EXPLODED VIEW AND MECHANICAL PARTS LIST ............................................................... 41
PARTS LIST ............................................................................................................................... 45
ASSEMBLY PARTS LIST .......................................................................................................... 64
SPECIFICATIONS ..................................................................................................................... 65
SAFETY PRECAUTIONS
Before returning any models to the customer, a safety check of the entire instrument should be made.
The service technician must be sure that no protective device built into the instrument by the manufacture
has become defective or inadvertently degraded during servicing.
1.WARNING:
Alterations of the design or circuitry of these models should not be made.
Any design changes or additions such as, but not limited to, circuit modifications, auxiliary speaker
jacks, switches, grounding, active or passive circuitry, etc. may alter the safety characteristics of these
models and potentially create a hazardous situation for the user.
Any design alterations or additions will void the manufacturer's warranty and will further relieve the
manufacturer of responsibility for personal injury or property damage resulting therefrom.
2.PRODUCT SAFETY NOTICE
Many electrical and mechanical parts in this chassis have special characteristics. These characteristics
often pass unnoticed and the protection afforded by them cannot necessarily be obtained by using
replacement components rated for higher voltage, wattage, etc. Replacement parts that have these
special safety characteristics are identified in this manual and its supplements; electrical components
having such features are indentified by a
in the schematic diagram and the parts list. Before
replacing any of these components, read the parts list in this manual carefully. The use of substitute
replacement parts that do not have the same safety characteristics as specified in the parts list may
create shock, fire or other hazards.


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2
OPERATING CONTROLS
HANDSET CONTROLS AND FUNCTIONS
LCD
BASE UNIT CONTROLS AND FUNCTIONS
DC in 9V Jack
TEL LINE Jack
OGM button
ANSWER button
REPEAT button
PIN button
IN USE LED
CHARGE LED
POWERR LED
Liquid Crystal Display
(LCD)
REDIAL (
) button
(Left arrow button)
TALK button
PAUSE button
1 button
(TONE) button
MEM (Memory) button
FUNC (Function) button
DELETE
CH button
Charging contacts
VOL/RING (
) button
(up arrow button)
VOL/RING (
) button
(down arrow button)
FLASH (
) button
(Right arrow button)
SELECT button
T-P (TONE-PULSE) switch
Ringer ON/OFF switch
Speaker
Antenna
LED Display
VOLUME button
DELETE button
MEMO/2WAY REC button
PLAY/STOP button
PAGE button
SKIP button
Rec Time Switch (ANN/4/1)
CLOCK button
Ring Time Switch (2/4/TS)
SPEAKER button
Speaker LED
Microphone
CID (Caller ID) button
dialpad
Battery compartment
Dot matrix display
Number of calles
Date
Time
Caller's telephone number
Caller's name


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3
ALIGNMENT PROCEDURE
Test Mode For Base Unit
Press the "PAGE" key about 3.0 seconds while turning the power on.
1. To change the TEST mode: Press the "PAGE" key with T/P switch to PULSE position.
2. To change channel:
Press the "PAGE" key with T/P switch to TONE position. If changing the step, the
channel returns to the start channel.
3. To cancel Test mode:
Bell rings, charge the Handset or Power off.
*A : CHARGE LED is ON when SQ ON, CHARGE LED is OFF when SQ OFF.
*1 : "0000..." (250Hz) will be fed out continuously as transmitting data.
*2 : CHARGE LED lights when the received data are "0000...".
Channel rotation
19
ð20ð21ð40ð1ð25ð2ð3........24ð26........38ð39ð40
STEP
1
2
3
4
5
6
7
8
9
10
FUNCTION
VCO/TX FREQ. ADJ
TX MODE CHECK
TX DATA
RX SENS.
SQ SENS.
SINGLE TONE CHECK
DUAL TONE CHECK
DATA IN CHECK
CHANNEL DATA CHECK
DUPLEX
START CH
19
19
19
19
19
19
19
19
19
19
TX CONT
L
L
L
H
H
H
H
H
H
L
TX MUTE
L
H
L
L
L
L
L
L
L
H
RX MUTE
L
L
L
H
*A
L
L
L
L
H
RL CONT
L
H
L
H
H
H
H
L
L
H
REMARKS
*1
*2


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4
Test Mode For Handset Unit
To Perform the TEST mode, turn the power ON by pressing the "
" and "#" buttons at the same time.
When entered the TEST mode, the bell rings and the unit enters TEST mode 1. (Refer to the follwing table.)
1. To change the TEST mode: Press the number key for the corresponding TEST mode.
(Refer to the following table)
2. To change channel:
Press "CH" key.
(Note: If the step is changed, the channel return to the start channel.)
3. To cancel Test mode:
Turn the power OFF, charge the Handset , or press the "TALK" key.
*A : Squelch ON is H, or Squelch OFF is L.
*1 : In the TEST mode 3, "0000..." will be fed out continuously as transmitting data.
*2 : In the TEST mode 6, bell (2kHz, 2.2kHz) rings when the data received is "0000...".
*3 : In the TEST mode 7, bell rings with initial 2 tone (2kHz, 2.2kHz).
*4 : In the TEST mode 8, bell (2kHz, 2.2kHz) rings when P_BATLOW is "L".
*5 : In the TEST mode 9, bell (2kHz, 2.2kHz) rings when P_CHRGIN is "L"
Channel rotation
21
ð20ð19ð40ð1ð25ð2ð3........24ð26........38ð39ð40
STEP
1
2
3
4
5
6
7
8
9
10
FUNCTION
VCO/TX FREQ. ADJ
TX MOD. CHECK
TX DATA
RX SENS
SQ SENS
RECEIVE DATA CHECK
BELL
BATTERY LOW CHECK
CHARGE CHECK
DUPLEX
START CH
21
21
21
21
21
21
21
21
21
21
TX CONT
L
L
L
H
L
L
H
H
H
L
TX MUTE
L
H
L
L
L
L
L
L
L
H
RX MUTE
L
L
L
H
*A
L
L
L
L
H
CONV
H
L
L
L
L
H
H
H
H
L
REMARKS
*1
*2
*3
*4
*5
KEY
1
2
3
4
5
6
7
8
9
0
SC
H
H
H
H
H
H
L
L
L
H