TOSHIBA fd-4809 Service Manual

FILE NO. 2B0-9909

SERVICE MANUAL

CORDLESS TELEPHONE

FD-4809

PUBLISHED IN JAPAN, Nov., 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........................................................................... 24

ELECTRICAL PARTS LOCATION............................................................................................. 26

WIRING DIAGRAMS .................................................................................................................28

EXPLODED VIEW AND MECHANICAL PARTS LIST............................................................... 30

PARTS LIST............................................................................................................................... 34

ASSEMBLY PARTS LIST .......................................................................................................... 44

SPECIFICATIONS ..................................................................................................................... 45

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 contact

SELECT Button CID (Caller ID) Button

Dialpad

BASE UNIT CONTROLS AND FUNCTIONS LCD

TONE/PULSE Switch

DC in 9V Jack

LINE Modular Jack

900MHz CALLER ID FD-4809

Battery compartment

Dot matrix display

Base Antenna

Cradle

IN USE/CHARGE LED

PAGE Button

Charging Contact

Caller ID indication example

Number of calls

Date

Caller's telephone number Caller's name

Time

Base Unit

ALIGNMENT PROCEDURE

Transmitter Section

Connections

Power

Meter

RF Test Point

BASE Unit

J3 DC IN 9V Jack

Adapter

AC 120V 60Hz

Preset

a) Remove the solder on the pattern (refer to the illust. below). 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/CHARGE LED lighting.

Alignment Procedure

step

Adjustment

VR202

(TX P ower)

Remarks

Connect the Po w er Meter to the RF test point on the Base MAIN PCB. Adjust VR202 for a -4.0dBm reading on the Pow er Meter.

Alignment Point Location on Base Main PCB and Base RF PCB

Base Main PCB

Base RF PCB

VR202

RF Test Point

J1 TEL LINE Jack

J3 DC IN 9V Jack

S2 T/P Switch

Remove solder

Receiver Section

Connections

RF Test Point

DC IN

BASE Unit

AF Terminal

DC Voltmeter

AC 120V

60Hz

RF SG

9V Jack

Adapter

Preset

a) Remove the solder on the pattern (refer to the illust. below). 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/CHARGE LED lighting.

Alignment Procedure

step1Preset to

SG: 1mV

No modulation

Adjustment

(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 MAIN PCB. Make sure that the frequency is 903.417756 MHz. Connect the DC Voltmeter to the Discriminator test point. Adjust L1 to indicate DC 0.90 V.

Remarks

Alignment Point Location on Base Main PCB and Base RF PCB

Base Main PCB

Discriminator Test Point

RF Test Point

J1 TEL LINE Jack

J3 DC IN 9V Jack

S2 T/P Switch

Remove solder

Handset Unit

Transmitter Section

Connection

Power

Meter

RF Test Point

HANDSET Unit

J603 Battery Connector

DC Power Supply

DC 3.8V

Preset

a) Remove the solder on the pattern (refer to the illust. below). 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

VR502

(TX Po wer)

Remarks

Connect the RF power Meter to the RF test point on the handset MAIN PCB. Adjust VR502 for a -4.0dBm reading on the Pow er Meter.

Alignment Point Location on Handset Main PCB and Handset RF PCB

Handset PCB

RF PCB

VR502

RF Test Point

Remove solder

Receiver Section

Connections

RF SG

RF Test Point

HANDSET Unit

DC Power Supply

J603

Battery

Connector

DC 3.8V

Discriminator Test Point

Preset

a) Remove the solder on the pattern (refer to the illust. below). 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

step1Preset to

SG: 1mV

No modulation

Adjustment

L603

(Discriminator

Voltage)

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 926.495220 MHz. Connect the DC Voltmeter to the Discriminator test point. Adjust L603 to indicate DC 0.90 V.

DC Voltmeter

Remarks

Alignment Point Location on Handset Main PCB and Handset RF PCB

Handset PCB

Discriminator Test Point

RF PCB

L603

RF Test Point

Remove solder

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 IC3?

Is there pulse wave at pin 47 of IC4?

Check IC4 and its peripheral circuit.

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

Check IC3 and TEL network circuit.

Check R40, R125 and R39.

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 pin63 of IC4 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 2 of IC606 be seen?

At the Q609 collector, can the pulse wave be seen?

Check RINGER Y601.

Check R105 and S1.

Check IC606.

Check R667 and Q609.

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. ±23kHz~±45kHz Dev.

Press “PAGE” key 2 times, 903.417756 MHz (30kHz ±30kHz Dev.) 1mV output signal from RF jack is applied. Can the IN USE/CHARGE LED be lighted?

Check IC4 and its

peripheral circuit.

Check base RF unit.

NG Check whether there is a

pulse data waveform at C47.

Check base RF unit.

Check whether there is a

30kHz waveform at C3.

Check whether there is a 30kHz pulse wavef orm at pin 34 of IC2.

Check whether there is a

pulse data waveform at pin 40 of IC2.

Check R77, C50, R75, C48 and C47.

Check base RF unit and

the peripheral circuit of IC1, Q1, FT1and FT2.

Check R4, R5, R6, R8,C3,

C4, C5, D1, IC2 and their peripheral circuit.

Check IC2 and its

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 the voltage at pin 10 of IC1 is more than 1V.

Check C22, IC4 and its peripheral circuit.

NG Check IC606 and its

peripheral circuit.

Check handset RF unit.

Check IC1 and its

peripheral circuit.

Press “3” key, check whether deviation of the TX data is app. ±23kHz ~ ±45kHz Dev.

Press “5” key, 926.49522 MHz (30kHz ±30kHz Dev.) 1mV output signal from RF jack is applied. Check whether the bell ring.

Place the handset on the base to charge about 10 seconds, then connect again.

Check whether there is a

pulse data waveform at C630.

Check handset RF unit.

NG Check whether there is

the 30kHz waveform at C605.

Check whether there is a 30kHz pulse wavef orm at pin 34 of IC602.

Check whether the voltage at pin 10 of IC601 is more than 1V.

Check whether there is

a pulse data waveform at pin 40 of IC602.

Check R656, C633, R654, C631 and C630.

Check handset RF unit

and the peripheral circuit of IC601, Q605, FT601, FT602.

Check R620, R621,

R623, R625, C605, C607, C608, D611, IC602 and their peripheral circuit.

Check IC601 and its

peripheral circuit.

Check IC602 and its

peripheral circuit.

Check C606, IC606 and its peripheral circuit.

+ 32 hidden pages