SERVICE MANUAL
PUBLISHED IN JAPAN, Sep., 2001
FILE NO. 2BO-200112
FT-8801A
CORDLESS TELEPHONE
-- 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 ...................................................................................................... 27
WIRING DIAGRAMS ............................................................................................................................ 29
EXPLODED VIEW AND MECHANICAL PARTS LIST ........................................................................ 31
PARTS LIST ......................................................................................................................................... 33
ASSEMBLY PARTS LIST .................................................................................................................... 47
SPECIFICATIONS ............................................................................................................................... 48
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
manufacturer 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 identified 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.
-- 2 --
OPERATING CONTROLS
BASE UNIT CONTROLS
TALK Button
(TONE) Button
MEM (Memory) Button
PAUSE Button
Charging contact
DELETE
CH Button
FUNC Button
Antenna
CID Button
SELECT Button
Dialpad
Rechargeable
Battery Pack (back)
LCD Display
VOL/RING Button
L.D. Button
(PULSE) Button
FLASH Button
LOCAL Button
TALK
ABC
2
JKL
5
TUV
8
OPER
TONE
MEM
PAUSE
FUNC
CH
DELETE
LOCAL
L.D.
SELECT
REDIAL
FLASH
VOL/
RING
CID
0
DEF
3
MNO
6
WX
YZ
PQ
RS
9
#
#
GHI
4
7
1
COMPANDOR NOISE REDUCTION
REDIAL Button
LCD
Number of calls
Dot matrix display
Date
Time
Caller's telephone number
Caller's name
DC IN 9V Jack
LINE modular Jack
Antenna
IN USE/CHARGE LED
PAGE Button
Charging Contact
Cradle
IN USE
PAGE
CHARGE
DIGITAL
CALLER-ID
CORDLESS
TELEPHONE
COMPANDOR NOISE REDUCTION
FT-8801
HANDSET CONTROLS
SETTING THE DIAL MODE
1 Press and hold FLASH until you hear a
confirmation tone.
2 To set the dial mode for pulse dialing,
press # . Or to set the dial mode for
tone dialing press
. A confirmation
tone sounds to indicate the setting is
complete.
-- 3 --
Base Main PCB
RF Test Point
RT2
RT1
CT1
J1
TEL LINE Jack
J2
DC IN 9V Jack
Alignment Point Location on Base Main PCB
Power
Meter
RF
Test Point
BASE Unit
J2
DC IN
9V Jack
1kHz -11dBm
AF GEN.
AC 120V
60Hz
Frequency
Counter
Deviation
Meter
RF
Test Point
J1
TEL Line
Jack
AC
Adapter
ALIGNMENT PROCEDURE
Base Unit
Transmitter Section
Connections
Preset
a) Connect the AC adapter to the base unit while pressing the "PAGE" key, and keep pressing it continuously for
approximate 2 seconds.
b) Release the "PAGE" key when entering TEST mode 1 with IN USE LED lighting.
Alignment Procedure
Step
1
2
3
Adjustment
RT1
(TX Power)
CT1
(TX Frequency)
RT2
(TX Modulation)
Remarks
Connect the Power Meter to the RF test point on the Base MAIN PCB.
Adjust RT1 for a -6dBm 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 -11dBm from the AF Generator.
Connect the Deviation Meter to the RF test point on the Base MAIN PCB.
Adjust RT2 to indicate
±8 kHz Dev.
-- 4 --
Alignment Point Location on Base Main PCB
AC Voltmeter
BASE Unit
AF
Terminal
Dummy Load
(600-ohms)
RF SG
AC 120V
60Hz
J2
DC IN 9V Jack
+
RF
Test Point
J1
TEL Line
Jack
AC
Adapter
DC Voltmeter
-
+
-
Receiver Section
Connections
Alignment Procedure
Step
1
2
3
Preset to
SG: 1mV
(
-47dBm)
No modulation
SG: 1mV
(
-47dBm)
1 kHz
±8kHz
Deviation
No modulation
SG:
-6.0 dBµV
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 Discriminator test point. Adjust L15
to indicate DC 2.10V.
Connect the AC Voltmeter across a 600-ohms dummy to theTelephone
Line Jack. Adjust RT4 for a -11dBm 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 RT3 to turn to the
point where the CHG LED just turns on.
Adjustment
L15
(Discriminator
Voltage)
RT4
(RX AF
Voltage)
RT3
(SQ Point)
(
-113dBm)
Preset
a) Connect the AC adapter to the base unit while pressing the "PAGE" key, and keep pressing it continuously for
approximate 2 seconds.
b) Release the "PAGE" key when entering TEST mode 1 with IN USE LED lighting.
Base Main PCB
RF Test Point
RT3
RT4
L15
J1
TEL LINE Jack
J2
DC IN 9V Jack
Discriminator Test Point