Toshiba FT 3809 Service Manual

SAFETY PRECAUTIONS-------------------------------------------------------------------------- 1 OPERATING CONTROLS ------------------------------------------------------------------------ 2 ALIGNMENT PROCEDURE --------------------------------------------------------------------- 4 BLOCK DIAGRAM -------------------------------------------------------------------------------- 12 SCHEMATIC DIAGRAMS ----------------------------------------------------------------------- 14 TROUBLESHOOTING HINTS ------------------------------------------------------------------ 16 FREQUENCY CHART ---------------------------------------------------------------------------- 22 IC AND TRANSISTOR VOLTAGE CHART -------------------------------------------------- 23 SEMICONDUCTOR LEAD IDENTIFICATION ---------------------------------------------- 28 ELECTRICAL PARTS LOCATION ------------------------------------------------------------- 30 WIRING DIAGRAMS ------------------------------------------------------------------------------ 32 EXPLODED VIEW AND MECHANICAL PARTS LIST ------------------------------------ 34 COMPONENT LIST -------------------------------------------------------------------------------- 38 INDIRECT MATERIALS LIST ------------------------------------------------------------------- 53 PACKING PARTS LIST---------------------------------------------------------------------------- 54 SPECIFICATIONS ---------------------------------------------------------------------------------- 55

SAFETY PRECAUTIONS

Before returning any TOSHIBA FT3809BK 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 manufacturer 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 component 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 identified 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.

OPERA TING CONTR OLS

MAIN FEA TURES ON HANDSET

1. Helical Antenna - Durable high -gain helical antenna.

2. T ALK / FLASH K e y & Indicator - Places the handset into talk mode when used aw ay from the base unit/Access Services such as Call Waiting and Call Forwarding . The indicator lights when the handset is in talk mode.

3. BATT LOW & Indicator - Blinks on and of f when the handset battery needs to be charged.

4. OFF Key - Places the handset into standby mode.

5. CHANNEL CHANGE - Switch to a new channel during conversation.

6. Volume H/L Control - Control the loudness of the receiver.

7. Dialing Keys - Used for dialing numbers, storing numbers in memory.

8. TONE - Temporary set the telephone into TONE mode.

9. PROGRAM - Used when storing numbers in the memory.

10. REDIAL - Redial the last number dialed.

11. MEMOR Y - To dial a number from memory .

12. Charging Contacts - Provides power to char ge the handset when it is placed on the base unit.

13. BATTERY PACK (B A CK)

TEL.LINE

DC 9V

REAR SIDE OF BASE UNIT

SPEED DIAL INDEX

1 2 3 4 5

BACK SIDE OF BASE UNIT

6 7 8 9 0

4 5

MAIN FEATURES ON BASE UNIT

1. Phone Cord Jack -Plugs one end of the telephone line cord into standard RJ11C telephone line jack and the other end into this jack for connecting the base unit to the telephone line.

2. Antenna - Durable high-fain rod antenna.

3. IN-USE Indicator - Illuminates when handset is off hook (line engaged).

4. CHARGE Indicator - Goes on when the handset is in the cradle and the battery is charging.

5. POWER Indicator - Illuminates when power is applied to base unit.

6. Memory Dialing cord - Memeory location recording.

7. PAGE - To page the handset, press page key once. Pressing the PAGE a second time will cancel the page.

8. Charging Contacts - Provides power to charge the handset when it is placed onthe base unit.

9. TONE/PULSE Switch - Set the dialing mode between DTMF and PULSE.

10. POWER ADAPTOR JACK - Insert one of the plugs into the jack.

ALIGNMENT PROCEDURE

Perform the alignment of the Handset & Base using the test mode described below:

1. Test mode for Handset unit:

1.1 Connecting the 3.6VDC power supply to the battery contact.

1.2 Pressing the “#” and “3” keys at the same time for twice, “TALK/BATT LOW” LED will be on.

1.3 To change channel, press the CHANNEL key.

1.4 To toggle TX power , press the PROG key.

1.5 To toggle RX power, press the key.

1.6 To toggle TX attenuater, press the REDIAL key.

1.7 To change PLL gain mode, lowest (4 steps) ! highest, Press the PHONE key.

1.8 Pressing OFF key to exit from test mode.

1.9 LED indication.

TALK/BATT LOW “ON”

TX power on

2. Test mode for Base unit:

2.1 Apply AC power by connecting the AC adaptor to Base unit, Pressing and hold the PAGE button at same time, then, slide the TONE/PULSE switch from PULSE to TONE to enter test mode, The IN_USE LED and the CHARGE LED will illuminate.

2.2 Change Mode:

Press and hold the PAGE button for 1-2 seconds. You will change to the next mode. once the charge LED change state (ON!OFF or OFF ! ON).

MODE Charge LED Function Press PAGE button

1 ON Change RF channel 1-30 (default 6) 2 OFF Toggle RF transmitter power Default on 3 ON Unused 4 OFF Generate single tone from

DTMF table for 3 seconds, There are 8 tones in the table.

697, 770, 852, 941, 1209, 1336, 1477, 1633 Hz default is 697Hz.

3. Handset unit :

3.1 Test equipment required and connection.

RX -Loop-V TX-Loop-V RX-Audio

Digital Voltmeter

Audio

Generator

MIC IN / Handset unit RX Audio (RF & Audio Board) TX Audio / REC + Batt. ANT

3.6V

Frequency

Counter

3.2 Preparation from alignment

Place the H/S Board into test mode, disconnect microphone wire at H/S Board and set the volume to “L” position.

3.3. Alignment procedure :

Step Preset Adjustment Remark

1 H/S Board into test

mode ---

Connect the digital voltmeter to the PCB test point RX-Loop-V. The reading should > 0.25V DC and < 2.45V DC.

2 H/S Board into test

mode ---

Connect the digital voltmeter to test point TXLoop -V. The reading should > 0.25V DC and <

2.45V DC.

3 H/S Board into test

mode

4 H/S Board into test

mode

5 Audio Gen : 1KHz,

-20dB (NO Load)

6 Audio Gen : 1KHz,

-40dB (NO Load)

HRC25 Connect the digital voltmeter to test point RX-

Audio. Adjust for 1.45VDC to 1.75VDC at CH6.

HVC1 Connect the Frequency counter to test point ANT.

Adjust for 926.55MHz at CH6.

HR113 Connect the VTVM to test point REC + Adjust for

-35dB

HR119 Connect the VTVM to test point TX Audio. Adjust

for -16dB.

VTVM

4. Base unit :

4.1 Test Equipment required and connection.

AC Power supply : 120V 50Hz

RX -Loop-V TX-Loop-V RX-Audio

Digital Voltmeter

Audio

Generator

Quad-Tune / Base unit Pin4 &5 of BT1/ Pin3 of BT1 (RF & Audio Board) Tx Audio

9V DC IN ANT

Adapter Frequency

Counter

4.2. Preparation from alignment

Place the Base Board into test mode.

4.3. Alignment procedure :

Step Preset Adjustment Remark

1 Base Board into test

mode ---

Connect the digital voltmeter to the point RXLoop -V. The reading should >0.25V DC and <4.3V DC.

2 Base Board into test

mode ---

Connect the digital voltmeter to test point TXLoop -V. The reading should > 0.25V DC and <4.3 DC.

3 Base Board into test

mode

BRC99 Connect the digital voltmeter to test point RX

AUDIO. Adjust for1.625VDC to 1.925VDC at CH6.

4 Base Board into test

mode

5 Audio Gen : 1KHz,

-10dB (NO Load)

6 Audio Gen : 1KHz,

-30dB (NO Load)

BC56 Connect the Frequency counter to test point ANT.

Adjust for 903.8MHz at CH6.

BR40 Connect the VTVM to test point PIN 4 &5 of BT1

Adjust for -10dB

BR39 Connect the VTVM to test point TX Audio. Adjust

for -26dB.

VTVM

Base Unit Audio Block Diag ram

BLOCK DIAGRAM

Tx-Audio

Rx-Audio

TA31103F

RSSI

RF Control

Audio Power(s)

Handset Audio Block Diag ram

Tx Filter

RF Powers

Summing Amp

Pre-amp

Tx Data

Rx Data

Tx Mute

Rx Mute

MCU

Power

Control

Compressor

Expandor

EFPROM

ATE

interface

DTMF

D/A Circuit

Speech

Network

Speech

Network

Telephone Line

Isoiation Boundary

Cradie Contacts Battery

Tx-Audio

Rx-Audio

RF Control

RSSI

Tx Filter

Data Filter

Audio Power (s)

RF Power (s)

Summing Amp

Pre-amp

Tx Data

Rx Data

Tx Mute

Rx Mute

MCU

Power

Control

Compressor

Expandor

Keypad

EFPROM

ATE

interface

TA31103F

Pre-amp

Ringer

Cradie Contacts Battery

Microphone

Receiver

RF module Block Diagram

2 POLE CERAMIC

Ist Rx AMP

1 GHz LOW PASS

SAW FILTER

TX O.P AMP

TX L.O.

TX Audio

2nd Rx AMP

V-Tune

MIXER

Fin

3 LINE DAT A

10,7 MHz CERAMIC

Fin

DUAL PRESCALER SYNTHESIZER

4.0 MHz REFERENCE

IF AMP

V-Tune

Rx L.O.

10.7MHz CERAMIC

V-Tune

Rx-AUDIO

RX DAT A

RSSI

45200001.sch-1 - Thu Jan 20 16:42:22 2000

3809bs.sch-1 - Thu Jan 20 16:33:20 2000

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 made bell signal, does PIN 4 of BU4 change from high to low.

By using voltmeter check BU2 of base.

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

By using voltmeter check BU4.

Check TEL network primary

circuit.

BU2 is defective.

BU4 is defective.

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

Can the base and handset be connected.

NG NG

Check whether the base & handset RX and TX-Loop-V are OK.

Check the base TX Power

OK OK NG

Check the base TX data deviation

Check the handset RX Sensitivity

Check RX data pulse wave on RX-DATA

Press handset Dial Key

NG NG

while in Talk Mode, Can key touch sound be heard from the ringer.

When the key of the handset is pressed, can the pulse output at PIN20 of HU3.

NG OK

At the HD6 anoe, Can the pulse wave be seen.

By using voltmeter, check the base & handset PLL circuit (BU10/HU3 and surrounding circuit of BU10/HU3)

By using voltmeter, check the base TX circuit.

By using voltmeter, check BU5 and BU6

Check the handset RX RF circuit (HU1) as well as well as HQ2.

Check HU6D and surrounding circuit of HU6

Check HU3 circuit.

Check HQ14, HQ17 and

HR139.

When the PAGE SW of the base is pressed, does PIN21 of BU3 change from high to low.

Check the BU3 and the surrounding circuit of BU3.

Ringer is defective.

Check the BS3, BR69 and BR77.

+ 42 hidden pages

Toshiba FT 3809 Service Manual

CONTENTS

OPERA TING CONTR OLS

ALIGNMENT PROCEDURE

BLOCK DIAGRAM

TROUBLESHOOTING HINTS