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48
CORDLESS TELEPHONE
PUBLISHED IN JAPAN, Aug., 1999
SERVICE MANUAL
FILE NO. 2B0-9901
FT-8009


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1
CONTENTS
SAFETY PRECAUTIONS ............................................................................................................ 1
OPERATING CONTROLS ........................................................................................................... 2
ALIGNMENT PROCEDURE ........................................................................................................ 3
BLOCK DIAGRAMS ..................................................................................................................... 7
SCHEMATIC DIAGRAMS ............................................................................................................ 9
TROUBLESHOOTING HINTS ................................................................................................... 13
IC AND TRANSISTOR VOLTAGE CHART ............................................................................... 20
SEMICONDUCTOR LEAD IDENTIFICATION ........................................................................... 24
ELECTRICAL PARTS LOCATION ............................................................................................. 26
WIRING DIAGRAMS .................................................................................................................28
EXPLODED VIEW AND MECHANICAL PARTS LIST ............................................................... 30
PARTS LIST ............................................................................................................................... 34
ASSEMBLY PARTS LIST .......................................................................................................... 42
SPECIFICATIONS ..................................................................................................................... 43
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
BASE UNIT CONTROLS AND FUNCTIONS
Antenna
TALK/BATT.LOW LED
TALK Button
REDIAL Button
PAUSE Buttons
MEM Button
One-touch dialing Button
(MEM1 - MEM3)
Dialpad
Rechargeable Battery Pack
(back)
Charging Contacts
LINE Modular Jack
DC in 9V Jack
T-P(TONE-PULSE) Switch
Antenna
IN USE/CHARGE LED
PAGE Button
Charging Contacts
FLASH Button
VOL/RING Button
CH Button
MUTE Button
TONE Button


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3
ALIGNMENT PROCEDURE
Base Unit
Transmitter Section
Connections
Preset
a) Connect the base RF unit to the base main unit.
b) Set the "TONE / PULSE" switch to PULSE.
c) Connect the AC adapter to the base unit while pressing the "PAGE" key, and keep pressing it continuously for
approximate 2 sectonds.
d) Release the "PAGE" key when entering TEST mode 1 with IN USE LED lighting.
Alignment Procedure
Alignment Point Location on Base Main PCB and Base RF PCB
S2
T/P Switch
RT3
RT301
P
T
RF Test Point
step
1
2
3
Adjustment
RT301
(TX Power)
CT1
(TX Frequency)
RT3
(TX Modulation)
Remarks
Connect the Power Meter to the RF test point on the Base MAIN PCB.
Adjust RT301 for a -5.0dBm reading on the Power Meter.
Connect the Frequency Counter to the RF test point on the Base MAIN
PCB. Adjust CT1 to make sure that the frequency is 926.897468 MHz.
Press the "PAGE" key to enter the TEST Mode 2. Connect the AF Generator
to the TEL Line Jack on the Base Main PCB. Make sure that the output is 1
kHz 77.5 mV from the AF Generator.
Connect the Deviation Meter to the RF test point on the Base MAIN PCB.
Adjust RT3 to indicate ±8 kHz Dev.
CT1
Base RF PCB
J2
DC IN 9V Jack
J1
TEL LINE Jack
Base Main PCB
Power
Meter
RF
Test Point
BASE Unit
J2
DC IN
9V Jack
1kHz 77.5mV
AF GEN.
AC 120V
60Hz
Frequency
Counter
Deviation
Mater
RF
Test Point
J1
TEL Line
Jack
AC
Adapter


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4
Receiver Section
Connections
Alignment Point Location on Base Main PCB and Base RF PCB
Preset
a) Connect the base RF unit to the base main unit.
b) Set the "TONE/PULSE" switch to PULSE.
c) Connect the AC adapter to the base unit while pressing the "PAGE" key, and keep pressing it continuously for
approximate 2 seconds.
d) Release the "PAGE" key when entering TEST mode 1 with IN USE LED lighting.
Alignment Procedure
step
1
2
3
Preset to
SG: 1mV
No modulation
SG: 1mV
1 kHz ±8kHz
deviation
SG: -6.0 dB
µµµµµV
1kHz ±8kHz
Deviation
Remarks
Press the "PAGE" key for 3 times to enter the TEST Mode 4. Connect the
RF Signal Generator to the RF test point on the Base MAIN PCB. Make
sure that the frequency is 902.952467 MHz.
Connect the DC Voltmeter to the AF test point. Adjust L3 to indicate DC
1.00 V.
Connect the AC Voltmeter across a 600-ohm dummy to the Telephone Line
Jack. Adjust RT2 for a 220 mV reading on the AC voltmeter.
Press the "PAGE" key to enter the TEST Mode 5. Make sure that the
frequency of RF SG output is 902.952467 MHz. Adjust RT1 to turn to the
point where the CHG LED just turns on.
Adjustment
L3
(Discriminator
Voltage)
RT2
(RX AF
Voltage)
RT1
(SQ Point)
S2
T/P Switch
RT2
P
T
RF Test Point
RT1
J2
DC IN 9V Jack
J1
TEL LINE Jack
L3
Base Main PCB
AC Voltmeter
BASE Unit
AF
Terminal
Dummy Load
(600-ohm)
RF SG
AC 120V
60Hz
J2
DC IN 9V Jack
+
RF
Test Point
J1
TEL Line
Jack
AC
Adapter
DC Voltmeter
-
+
-
AF Test Point