TOSHIBA ft8809 Service Manual

FILE NO. 2B0-9902

SERVICE MANUAL

CORDLESS TELEPHONE

FT-8809

PUBLISHED IN JAPAN, Aug., 1999

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........................................................................... 25

ELECTRICAL PARTS LOCATION............................................................................................. 27

WIRING DIAGRAMS .................................................................................................................29

EXPLODED VIEW AND MECHANICAL PARTS LIST............................................................... 31

PARTS LIST............................................................................................................................... 35

ASSEMBLY PARTS LIST .......................................................................................................... 45

SPECIFICATIONS ..................................................................................................................... 46

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.

OPERATING CONTROLS

HANDSET CONTROLS AND FUNCTIONS

Liquid Crystal Display (LCD)

Antenna

VOL/RING Button

REDIAL Button

TALK Button

(TONE) Button

MEM (Memory) Button

PAUSE Button

FUNC (Function) Button

DELETE , CH Button

Charging contacts

SELECT Button CID (Caller ID) Button

Dialpad

BASE UNIT CONTROLS AND FUNCTIONS LCD

TONE/PULSE Switch

DC in 9V Jack

LINE Modular Jack

Battery compartment

Dot matrix display

Base Antenna

Cradle

IN USE/CHARGE LED

PAGE Button

Charging Contacts

Caller ID indication example

Number of calls

Date

Caller’s telephone number Caller’s name

Time

ALIGNMENT PROCEDURE

Base Unit

Transmitter Section

Connections

Power

Meter

Frequency

Counter

Deviation

Mater

RF Test Point

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.

BASE Unit

J2 DC IN 9V Jack

TEL Line

Jack

1kHz -20dBm

AF GEN.

Adapter

AC 120V 60Hz

Alignment Procedure

step

Adjustment

RT301

(TX P ower)

CT1

(TX Frequency)

RT3

(TX Modulation)

Remarks

Connect the Po w er Meter to the RF test point on the Base MAIN PCB. Adjust RT301 for a -5.5dBm 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” k e y to enter the TEST Mode 2. Connect the AF Generator to the TEL Line J a ck on the Base Main PCB. Make sure that the output is 1 kHz -20dBm from the AF Generator . Connect the Deviation Meter to the RF test point on the Base MAIN PCB. Adjust RT3 to indicate ±8 kHz De v.

Alignment Point Location on Base Main PCB and Base RF PCB

Base Main PCB

Base RF PCB

RT3

CT1

RT301

J1 TEL LINE Jack

J2 DC IN 9V Jack

S2 T/P Switch

RF Test Point

Receiver Section

Connections

RF SG

RF Test Point

TEL Line

Jack

Dummy Load

(600-ohm)

AC V oltmeterBASE Unit

AC 120V

60Hz

Adapter

DC IN 9V Jack

AF Terminal

DC V oltmeter

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

SG: 1mV

No modulation

SG: 1mV

1 kHz ±8kHz

deviation

SG: -6.0 dB

1kHz ±8kHz

Deviation

Adjustment

(Discriminator

Voltage)

(RX AF

Voltage)

µµ

µV

µµ

(SQ Point)

RT2

RT1

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 L3 to indicate DC 0.95 V.

Connect the AC Voltmeter across a 600-ohm dummy to the Telephone Line Jack. Adjust RT2 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 RT1 to turn to the point where the CHG LED just turns on.

Alignment Point Location on Base Main PCB and Base RF PCB

Base Main PCB

RT2

RT1

Discriminator Test Point

J1 TEL LINE Jack

J2 DC IN 9V Jack

S2 T/P Switch

RF Test Point

Handset Unit

Transmitter Section

Connection

Power

Meter

Frequency

Counter

Deviation

Mater

RF Test Point

HANDSET Unit

J603 Battery Connector

MIC+Pin

DC 3.8V

AF GEN.

1kHz 9mV

DC Power Supply

Preset

a) Connect the handseet 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 beep.

Alignment Procedure

step

Adjustment

RT501

(TX P ower)

CT601

(TX Frequency)

Remarks

Connect the RF power Meter to the RF test point on the handset MAIN PCB. Adjust RT501 for a -5dBm reading on the Power Meter.

Connect the Frequency Counter to the RF test point on the handset MAIN PCB. Adjust CT601 to make sure that the frequency is 903.052467 MHz.

Press the “2” key to enter the TEST Mode 2. Connect the AF Generator to

RT603

(TX Modulation)

the MIC Connector make sure that the output is 1kHz 9mV from the AF Generator. Connect the Deviation Meter to the RF test point on the handset MAIN PCB. Adjust RT603 to indicate ±8 kHz De v.

Alignment Point Location on Handset Main PCB and Handset RF PCB

Handset PCB

RT603

MC601

J603

CT601

RF Test Point

RF PCB

RT501

Receiver Section

Connections

RF SG

RF Test Point

Connector

Dummy Load

(150-ohm)

AC V oltmeterHANDSET Unit

DC Power Supply

Battery

Connector

DC 3.8V

J603

AF Terminal

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 beep.

Alignment Procedure

step

Preset to

SG: 1mV

No modulation

SG: 1mV

1 kHz ±8kHz

deviation

SG: -6.0 dB

1kHz ±8kHz

Deviation

Adjustment

L603

(Discriminator

Voltage)

RT602

(RX AF

Voltage)

µµ

µV

µµ

RT601

(SQ Point)

Press the “4” key to enter the TEST Mode 4. Connect the RF Singal Generator to the RF test point on the handset MAIN PCB. Make sure that the frequency is 926.997467 MHz. Connect the DC Voltmeter to the Discriminator test point. Adjust L603 to indicate DC 0.85 V.

Connect the RF Signal Generator to the RF test point on the handset MAIN PCB. Make sure that the frequency is 926.997467 MHz. Connect the AC Voltmeter across a 150-ohm dummy to the MIC Connector. Adjust RT602 f or a 35 mV reading on the AC Voltmeter.

Press the “5” k e y to enter the TEST Mode 5. Mak e sure that the frequency of RF SG output is 926.997467 MHz. Adjust RT601 to turn to the point where the Ringer just beeps.

DC V oltmeter

Remarks

Alignment Point Location on Handset Main PCB and Handset RF PCB

Handset PCB

J603

Discriminator Test Point

RT602

RT601

L603

RF PCB

RF Test Point

Base Unit

BLOCK DIAGRAMS

Handset

Base Unit

SCHEMATIC DIAGRAMS

Handset

TROUBLESHOOTING HINTS

1. The bell does not ring.

When the PAGE SW of the base is pressed, does the ringer on the handset ring?

When the TEL SG is joined with the base to make bell signal, is there pulse wave at pin 4 of IC4?

Is there pulse wave at pin 25 of IC5?

Check IC5 and its peripheral circuit.

See 2. The bell does not ring & page does not ring.

Check IC4 and TEL network circuit.

Check R58 and R59.

Deletion of the Caller ID memory

To delete the Caller ID memory in the EEPROM, proceed with the following process:

1) Connect the battery with pressing and # buttons, and keep pressing the buttons continuously for approximate 2 seconds.

2) Release buttons when entering TEST mode with beep.

3) Press CID button.

4) A confirmation beep will sound after about 8 seconds, then the data for caller ID is deleted. (Note: Do not disconnect the battery until you hear the confirmation beep, otherwise the data may not be completely deleted.)

2. The bell does not ring & page does not ring.

Can the base and handset be connected?

Press handset DIAL key while in TALK MODE. Can key touch sound be heard from the ringer?

When the PAGE SW of the base is pressed, does pin60 of IC5 change from high to low?

See 3. The base and handset cannot be connected.

When the key of the handset is pressed, can the pulse output at pin 58 of IC603 be seen?

At the Q616 collector, can the pulse wave be seen?

Check RINGER Y601.

Check R55, R77 and S1.

Check IC603.

Check R688, R673, R689, R672, R629, Q616 and Q617.

Check IC4 and its peripheral circuit.

3. The base and handset cannot be connected.

Check whether the base is able to set in the test mode 1.

Check the TX POWER and the TX FREQUENCY on the base unit.

Press “PAGE” key twice, check whether deviation of the TX data is app. 8 kHz Dev.

Press “PAGE” key 7 times, 902.952467 MHz (250 Hz ±8 kHz Dev.) 1mV output signal from RF jack is applied. Can the IN USE LED be lighted?

NGACheck IC4 and its

peripheral circuit.

Check base RF unit.

Check whether there is a

250 Hz data wav eform at C80.

Check base RF unit.

NG Check whether there is a

250 Hz data wav eform at pin 9 of IC3.

Check whether there is a 250 Hz data wav eform at the Q2 collector.

Check RT3, R53, R70,

R68, R69, R28, C35, C80 and C40.

Check base RF unit and

the peripheral circuit of IC3.

Check RT2, Q2 and their

peripheral circuit.

Check whether the handset is able to set in the test mode 1.

Check the TX POWER and the TX FREQUENCY on the handset unit.

Check whether there is a 250 Hz data wav eform at pin 37 of IC5.

Check IC5 and its peripheral circuit.

NG Check IC603 and its

peripheral circuit.

Check handset RF unit.

Check IC1 and their

peripheral circuit.

Press “3” key, chec k whether deviation of the TX data is app. 8 kHz Dev.

Press “6” key,

926.997467 MHz (250 Hz ±8 kHz Dev.) 1mV output signal from RF jack is applied. Check whether the bell ring.

Place the handset on the base to charge about 5 seconds, then connect again.

NG Check whether there is a

250 Hz data wavef orm at C669.

Check handset RF unit.

Check whether the 250

Hz data waveform from pin 9 of IC606 is fed.

Check whether there is a 250 Hz data wavef orm at the Q601 collector.

Check whether there is a 250 Hz data wavef orm at pin 55 of IC603.

Check R635, R636,

R634, R632, R619, C610, C669 and RT603.

Check handset RF unit

and the peripheral circuit of IC606.

Check RT602, Q601 and

their peripheral circuit.

Check IC601 and their

peripheral circuit.

Check IC603 and its peripheral circuit.

+ 33 hidden pages

TOSHIBA ft8809 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

OPERATING CONTROLS

ALIGNMENT PROCEDURE

BLOCK DIAGRAMS

SCHEMATIC DIAGRAMS

TROUBLESHOOTING HINTS