Toshiba FT-8006A BK User manual

CORDLESS TELEPHONE
SERVICE MANUAL
PUBLISHED IN JAPAN, Jun., 1998
FT-8006A
FILE NO. 2B3-9801
— SUMMARY —
The changes specified in this SUPPLEMENT are applied for the units with a dot mark shown
just after the Serial No. (ex. 836000001). Please check the dot mark shown after the Serial
No. on the bottom of the Base unit and Handset for repair. Use this manual together with
service data FT-8006A File No. 2B0-9702.
SUPPLEMENT

— 1 —
CONTENTS
ALIGNMENT PROCEDURE.................................................................................................................2
BLOCK DIAGRAMS..............................................................................................................................6
SCHEMATIC DIAGRAMS.....................................................................................................................8
TROUBLESHOOTING HINTS ...........................................................................................................12
IC AND TRANSISTOR VOLTAGE CHART .......................................................................................14
SEMICONDUCTOR LEAD IDENTIFICATION...................................................................................15
ELECTRICAL PARTS LOCATION .....................................................................................................16
EXPLODED VIEW AND MECHANICAL PARTS LIST ......................................................................18
PARTS LIST ........................................................................................................................................19
ASSEMBLY PARTS LIST ...................................................................................................................24
SPECIFICATIONS ..............................................................................................................................25

— 2 —
ALIGNMENT PROCEDURE
Base Unit
Transmitter Section
Connection
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 Adjustment Remarks
1VR202
(TX Power) Connect the Power Meter to the RF test point on the Base RF PCB. Adjust
VR202 for a −6.5 dBm reading on the Power Meter.
2CT201
(TX Frequency) Connect the Frequency Counter to the RF test point on the Base RF PCB.
Adjust CT201 to make sure that the frequency is 926.893873 MHz.
3RT2
(TX Modulation)
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 RF PCB.
Adjust RT2 to indicate ±8 kHz Dev.
Alignment Point Location on Base Main PCB and Base RF PCB
Power
Meter
Frequency
Counter
Deviation
Meter
RF
Test Point
RF
Test Point
BASE RF PCB
RF
Test Point J3
TEL Line
Jack 1kHz 77.5mV
AC
Adapter AC 120V
60Hz
J2
DC IN
9V Jack
BASE MAIN PCB AF GEN.
RF TEST POINT
Base RF PCB
Base Main PCB
RT2
CT201
VR202
J201
J3
TEL LINE Jack
J2
DC IN 9V Jack
S2
T/P Switch
T
P

— 3 —
Receiver Section
Connection
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 Preset to Adjustment Remarks
1SG: 1mV
No modulation
L212
(Discriminator
Voltage)
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 RF PCB. Make sure
that the frequency is 902.984676 MHz.
Connect the DC Voltmeter to the J1 AF test point. Adjust L212 to indicate
DC 0.85 V.
2SG: 1 mV
1 kHz ±8kHz
deviation
RT1
(RX AF
Voltage)
Connect the RF Signal Generator to the RF test point on the Base RF
PCB. Make sure that the frequency is 902.984676 MHz.
Connect the AC Voltmeter across a 600-ohm dummy to the Telephone
Line Jack. Adjust RT1 for a 195 mV reading on the AC voltmeter.
3SG: −6.5 dBµV
No modulation VR201
(SQ Point)
Press the “PAGE” key to enter the TEST Mode 5. Make sure that the
frequency of RF SG output is 902.984676 MHz. Adjust VR201 to turn to
the point where the CHG LED just turns on.
RF SG
−
+
RF
Test Point
BASE RF PCB
J3
TEL Line
Jack
BASE MAIN PCB
AC Adapter
AC 120V
60Hz
−
+
Dummy Load
(600-ohm)
AC Voltmeter
J1
AF Terminal DC Voltmeter
J2
DC IN
9V Jack
Base RF PCB
Base Main PCB
RF TEST POINT
AF TEST POINT RT1
J202
VR201
J201
J3
TEL LINE Jack
J2
DC IN 9V Jack
S2
T/P Switch
T
P
L212

— 4 —
Handset Unit
Transmitter Section
Connection
Preset
a) Connect the handset RF unit to the handset main unit.
b) Connect DC power supply to battery connector on the handset unit.
c) Turn the DC power supply ON while pressing “ ” and “#” keys, and keep pressing the keys continuously for
approximate 2 seconds.
d) Release keys when entering TEST mode 1 with TALK LED lighting and beep.
Alignment Procedure
Step Adjustment Remarks
1VR502
(TX Power) Connect the RF power Meter to the RF test point on the handset RF PCB.
Adjust VR502 for a −7 dBm reading on the Power Meter.
2CT501
(TX Frequency) Connect the Frequency Counter to the RF test point on the handset RF
PCB. Adjust CT 501 to make sure that the frequency is 903.085147 MHz.
3VR601
(TX Modulation)
Press the “2” key to enter the TEST Mode 2. Connect the AF Generator to
the MIC Connector make sure that the output is 1 kHz 10.5 mV from the AF
Generator.
Connect the Deviation Meter to the RF test point on the handset RF PCB.
Adjust VR601 to indicate ±8kHz Dev.
Alignment Point Location on Handset Main PCB and Handset RF PCB
Power
Meter
Frequency
Counter
Deviation
Meter
RF
Test Point
RF
Test Point
HANDSET RF PCB
RF
Test Point MIC + Pin 1kHz 10.5mV
J603
Battery
Connector
HANDSET MAIN PCB
DC Power Supply
DC 3.8V
AF GEN.
Handset Main PCB RF PCB RF TEST POINT
MIC + Pin
MC601
J603
Battery
Connector VR601 CT501
J501
VR502

— 5 —
Receiver Section
Connection
Preset
a) Connect the handset RF unit to the handset main unit.
b) Connect DC power supply to battery connector on the handset unit.
c) Turn the DC power supply ON while pressing “ ” and “#” keys, and keep pressing the keys continuously for
approximate 2 seconds.
d) Release keys when entering TEST mode 1 with TALK LED lighting and beep.
Alignment Procedure
Step Preset to Adjustment Remarks
1SG: 1 mV
No modulation
L512
(Discriminator
Voltage)
Press the “4” key to enter the TEST Mode 4. Connect the RF Signal
Generator to the RF test point on the handset RF PCB. Make sure that
the frequency is 926.994344 MHz.
Connect the DC Voltmeter to the J601 AF test point. Adjust L512 to
indicate DC 0.85 V.
2SG: 1 mV
1 kHz ±8 kHz
deviation
VR602
(RX AF
Output)
Connect the RF Signal Generator to the RF test point on the handset RF
PCB. Make sure that the frequency is 926.994344 MHz.
Connect the AC Voltmeter across a 150-ohm dummy to the MIC
Connector. Adjust VR602 for a 155 mV reading on the AC Voltmeter.
3SG: −6.5 dBµV
1 kHz ±8 kHz
deviation
VR501
(SQ Point)
Press the “5” key to enter the TEST Mode 5. Make sure that the
frequency of RF SG output is 926.994344 MHz. Adjust VR501 to turn to
the point where the indication is just vibrated.
Alignment Point Location on Handset Main PCB and Handset RF PCB
RF SG
−
+
RF
Test Point
HANDSET RF PCB
J602
SP
Connector
HANDSET MAIN PCB
−
+
Dummy Load
(150-ohm)
AC Voltmeter
J1
AF Terminal DC Voltmeter
J603
Battery
Connector
DC Power Supply
DC 3.8V
Handset Main PCB RF PCB
AF TEST POINT RF TEST POINT
J603
Battery
Connector
VR602
J502
VR501
L512
J602
SP
Connector J501

— 6 —

— 7 —

SCHEMATIC DIAGRAMS
Base, RF
— 8 — — 9 —

Handset, RF
— 10 — — 11 —