TOSHIBA ft8509 Service Manual

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CONTENTS

SAFETY PRECAUTIONS ...........................................................................................................1

OPERATING C O NTROLS ..........................................................................................................2

ALIGNMENT PROCEDURE .......................................................................................................3

BLOCK DIAGRAMS....................................................................................................................9

SCHEMATIC DIAGRAM .........................................................................................................11

TROUBLESHOOTING HINTS ..................................................................................................16

IC AND TRANSISTOR VOLTAGE CHART................................................................................ 23

SEMICONDUCTOR LEAD IDENTIFICATION ...........................................................................28

ELECTRICAL PARTS LOCATION.............................................................................................30

WIRING DIAGRAM .................................................................................................................33

EXPLODED VIEW AND MECHANICAL PARTS LIST...............................................................35

PARTS LIST..............................................................................................................................39

ASSEMBLY PARTS LIST..........................................................................................................49

SPECIFICAT IONS ....................................................................................................................50

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 ar identified by a parts list. Before replacing any of these components, read the parts list in this manual carefully. Th 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.

in the schematic diagram and th

OPERATING CONTROLS

HANDSET CONTROLS AND FUNCTIONS

TALK/BATT.LO W LED

Antenna

REDIAL Button

TALK Button

TONE Button

MEM Button

PAUSE Button

One-touch dialing Button

( MEM1 - MEM3 )

Rechargeable Battery Pac (back)

BASE UNIT CONTROLS AND FUNCTIONS

DC 9V IN Jack

TEL Line Jac

FLASH Button

Dialpad VOL/RING Button

CH Button MUTE Button

Charging Contact

TONE/PULSE Switch Line Ringer Volume Switch

Speaker

Antenna

TONE Button

RDL (Redial) Button

HOLD Button

IN USE LED

CHARGE LED

POWER LED

MEM (Memory) Button

Speed Dial Index (1 to 10) PAUSE Button

MUTE Button INTCOM LED (Green)

Speaker Volume Control INTCOM Button

FLASH Button Speaker LED (Green)

SPEAKER Button

Microphone

ALIGNMENT PROCEDURE

Test Mode For Base Unit

Press the “＊” and “#” keys at the same tim e about 1.5 seconds while turning the powe r on, the confirmation beep will sound to indicate that the unit is in the test mode.

1. To change the TEST mode: Press the number key for the corresponding TEST mode. (Refer to the following table)

2. To change channel: Press the “RDL” key, but if ch anging the step, the channel returns to the start channel.

3. To cancel Test mode: Bell rings, charge the Handset or Power off.

STEP FUNCTION KE START CH TX CONT TX MUTE RX MUTE RL CONT REMARKS

1 VO/TX FRQ. ADJ 1 19 L L L L 2 TX MODE CHECK 2 19 L H L H 3TX DATA 3 19 L L L L *1 4 RX SENS. 4 19 H L H H 5 SQ SENS. 5 19 L L H/L H *2 6 RING CHECK 6 19 H L L L 7 DUAL TONE CHECK 7 19 H L L H *3 8 DATA IN CHECK 8 19 L L L H *4

CHANNEL DATA CHECK

9 10 DUPLE 0 19 L H H H 1 1 INT COM MEM 19 L H H L

919H L L L*5

*1 : “0000...” (250Hz) will be fed out continuously as transmitting data. *2 : Bell rings when sensing SQ. *3 : Every pushing of FLASH key makes tone change. (In the case of Dual Tone, changes as

1Ö2Ö3Ö4Ö5Ö6Ö7Ö8Ö9Ö0Ö∗Ö#Ö1.)

DTMF Frequency

ROW1 : 697 ROW2 : 770 ROW3 : 852 ROW4 : 941 COL1 : 1209 COL2 : 1336

COL3 : 1477 *4 : Bell rings when the received data are “0000...” (250Hz). *5 : Charge LED lights when detecting Charge ON.

Channel rotation

19 Ö20Ö21Ö40Ö1Ö2Ö3Ö4Ö5............37Ö38Ö39Ö40

Test Mode For Handset Unit

To perform the TEST mode, turn the power ON by pressing the “＊” and “#” buttons at the same time. When entered the TEST mode, the bell rings and the unit enters TEST mode 1. (Refer to the following table.)

1. To change the TEST mode: Press the number key for the corresponding TEST mode.

(Refer to the following table)

2. To change channel: Press “CH” key.

(Note: If the step is changed, the channel returns to the start channel.)

3. To cancel the Test mode: Turn the power OFF, charge the Handset, or press the “TALK” key.

STEP FUNCTION KE START CH TX CONT SC TX MUTE RX MUTE CONV REMARKS

1 VO/TX FRQ. ADJ 1 21 L H L L H 2 TX MOD. CHECK 2 21 L H H L L 3 TX DATA 3 21 L H L L L *1 4 RX SENS. 4 21 H H L H L 5 SQ SENS. 5 21 L H L *A L 6 RECEIVE DATA CHECK 6 21 L H L L H *2 7 BELL 7 21 H L L L H *3 8 BATTERY LOW CHECK 8 21 H L L L H *4 9 CHARGE CHECK 9 21 H L L L H *5

10 DUPLE 0 21 L H H H L

*A : Squelch ON is H, or Squelch OFF is L. *1 : In the TEST mode 3, “0000...” will be fed out continuously as transmitting data. *2 : In the TEST mode 6, bell (1kHz) rings when the data received is “0000...”. *3 : In the TEST mode 7, bell rings with initial 2 tone (2kHz, 2.2kHz). *4 : In the TEST mode 8, bell (1kHz) rings when P_BATLOW is “L”. *5 : In the TEST mode 9, bell rings when P_CHRGIN is “L”.

Channel rotation

21 Ö20Ö19Ö40Ö1Ö2Ö3Ö4Ö5............37Ö38Ö39Ö40

Base Unit

Transmitter Section

Connections

Preset

Place the Base unit in VCO/TX FREQ. ADJ mo de in ac co rdance with the procedure on page 3.

Alignment Procedure

step Adjustment Remarks

RT301

(TX Power)

Power

Meter

Frequency

Counter

Deviation

Meter

Connect the Power Meter to the RF test point on the Base MAIN PCB. Adjust RT301 for a -5.0dBm reading on the Power Meter.

RF Test Point

BASE Unit

J1 DC IN 9V Jack

TEL Line

Jack

1kHz 77.6mV

AF GEN.

Adapter

AC 120V 60Hz

CT1

(TX Frequency)

Connect the Freq uency Counter to th e RF test point on the Base MAIN PCB. Adjust CT1 to make sure that the frequency is 926.897468 MHz.

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

RT3

(TX Modulation)

to the TEL Line Jack on the B ase M ain PCB. Make sure that the o utput is 1 kHz 77.6 mV from the AF Generator. Connect the Deviation Meter to the RF test point on the Base MAIN PCB. Adjust RT3 to indicate ±8 kHz Dev.

Alignment Point Location on Base Main PCB and Base RF PCB

Base Main PCB

J3 TEL LINE Jack

J1 DC IN 9V Jack

CT1

RT3

BASE RF PCB

RT301

RF TEST POINT

Receiver Section

Connections

RF SG

BASE Unit

RF Test Point

TEL Line

Jack

Dummy Load

(600-ohm)

AC Voltmeter

AF Terminal

DC Voltmeter

AC 120V

60Hz

DC IN 9V Jack

Adapter

Preset

Place the Base unit in RX SENS mode (step 4) in accordance with the procedure on page 3.

Alignment Procedure

step Preset to Adjustment Remarks

Connect the RF Signal Generator to the RF t est point on the Base MAIN PCB. Make sure that the frequency is 902.952467 MHz. Connect the DC Voltmeter to the AF test p oint (JV21). Adjust L3 to indicate DC 1.9V.

Connect the AC Voltmeter across a 600-ohm dummy to the Telephone Line Jack. Adjust RT2 for a 218 mV reading on the AC voltmeter.

Press the “5” 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 bell rings.

SG: 1mV

No modulation

SG: 1mV

1kHz ±8kHz

deviation

SG: -7dBµV

No modulation

(Discriminator

Voltage)

RT2

(RX AF

Voltage)

RT1

(SQ Point)

Alignment Point Location on Base Main PCB and Base RF PCB

Base Main PCB

RT1

RT2

AF TEST POINT

JV21

BASE RF PCB

RT301

J3 TEL LINE Jack

J1 DC IN 9V Jack

RF TEST POINT

Handset Unit

Transmitter Section

Connection

Preset

Place the Handset in VCO/TX FREQ. ADJ mode in accordance with the procedure on page 4.

Alignment Procedure

step Adjustment Remarks

RT501

(TX Power)

Power

Meter

Frequency

Counter

Deviation

Meter

Connect the RF Power Met er to the RF test point on the Handset MAI PCB. Adjust RT501 for a -7.5dBm reading on the Power Meter.

RF Test Point

HANDSET Unit

J401 Batter Terminals

MIC+Pin

DC 3.8V

AF GEN.

1kHz 9mV

DC Power Supply

CT401

(TX Frequency)

Connect the Fre quenc y Counter to th e RF t est p oint on the handset M AIN PCB. Adjust CT401 to make sure that the frequency is 903.052467 MHz.

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

RT403

(TX Modulation)

to the MIC Connector make sure that the output is 1kHz 9mV from the AF Generator. Connect the De viation Meter to the RF test poi nt on the handset MAIN PCB. Adjust RT403 to indicate ±8 kHz Dev.

Alignment Point Location on Handset Main PCB and Handset RF PCB

Handset PCB

RF TEST POINT

Receiver Section

Connections

RF SG

RF Test Point

HANDSET Unit

Connector

Dummy Load

(150-ohm)

AC Voltmeter

DC Power Supply

J401

Batter

Terminal

DC 3.8V

AF Terminal

DC Voltmeter

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 O N while pressing “ ＊” and “#” k eys, and keep pressin g the key cont inuously 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

Press the “4” key to enter the TEST Mode 4. Connect the RF Signal

SG: 1mV

No modulation

SG: 1mV

1kHz ±8kHz

Deviation

L402

(Discriminator

Voltage)

RT402

(RX AF

Voltage)

Generator to the RF test point on the handset MAIN PCB. Make sure that the frequency is 926. 997 467 MHz. Connect the DC Vo ltmeter to the AF test point. Adjust L402 t o indicate DC 1.00 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 RT402 for a 128 mV reading on the AC Voltmeter.

Press the “5” key to enter the TEST Mode 5. Make sure that the frequency of RF SG output is 926.997467 MHz. Adjust RT401 to turn to the point where the bell rings.

SG: -7dBµV 1kHz ±8kHz

Deviation

RT401

(SQ Point)

Alignment Point Location on Handset Main PCB and Handset RF PCB

Handset PCB

J401

RT402

RT401

AF TEST POINT

L402

RF PCB

RF TEST POINT

Base Unit

BLOCK DIAGRAMS

Handset Unit

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4544

Base Unit, ke

NOTES:

1. RESISTANCE VALUES ARE SHOWN IN OHMS UNLESS OTHERWISE NOTED. (K=KILO OHM, M=MEG OHM)

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4847

TROUBLESHOOTING HINTS

1. The bell does not ring.

When the INTCOM key 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 IC5?

Is there pulse wave at pin 37 of IC10?

Check IC10 and its periphe ral circuit.

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

Check IC5 and TEL network circuit.

Check R50, R113 and C47.

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 INTCOM key of the base is pressed, does pin 14 of IC10 change from to low?

See 3. The base and handset cannot be connected.

When the ke y of the handset is pressed, can the pulse output at pin 38 of IC404 be seen?

At the Q408 collector, can the pulse wave be seen?

Check RINGER Y401.

Check Keyboard Rub ber.

Check IC404.

Check R454, R457, R456, Q408, Q409 and D402.

Check IC10 and its periphe ral circuit.

+ 36 hidden pages

TOSHIBA ft8509 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

OPERATING CONTROLS

ALIGNMENT PROCEDURE

BLOCK DIAGRAMS

TROUBLESHOOTING HINTS