Toshiba FT-8006A BK Bedienungsanleitung

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

Test Point

BASE RF PCB

Test Point J3

TEL Line

Jack 1kHz 77.5mV

Adapter AC 120V

60Hz

DC IN

9V Jack

BASE MAIN PCB AF GEN.

RF TEST POINT

Base RF PCB

Base Main PCB

RT2

CT201

VR202

J201

TEL LINE Jack

DC IN 9V Jack

T/P Switch

— 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

−

Test Point

BASE RF PCB

TEL Line

Jack

BASE MAIN PCB

AC Adapter

AC 120V

60Hz

−

Dummy Load

(600-ohm)

AC Voltmeter

AF Terminal DC Voltmeter

DC IN

9V Jack

Base RF PCB

Base Main PCB

RF TEST POINT

AF TEST POINT RT1

J202

VR201

J201

TEL LINE Jack

DC IN 9V Jack

T/P Switch

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

Test Point

HANDSET RF PCB

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

−

Test Point

HANDSET RF PCB

J602

Connector

HANDSET MAIN PCB

−

Dummy Load

(150-ohm)

AC Voltmeter

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

Connector J501

— 6 —

— 7 —

SCHEMATIC DIAGRAMS

Base, RF

— 8 — — 9 —

Handset, RF

— 10 — — 11 —

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