Toshiba FT-8930 User Manual

FILE NO. 2B0-200008

SERVICE MANUAL

CORDLESS TELEPHONE

FT-8930

PUBLISHED IN JAPAN, Sep., 2000

CONTENTS

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

OPERATING CONTROLS........................................................................................................... 2

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

BLOCK DIAGRAMS..................................................................................................................... 7

SCHEMATIC DIAGRAMS..........................................................................................................10

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

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

SEMICONDUCTOR LEAD IDENTIFICATION........................................................................... 30

ELECTRICAL PARTS LOCATION............................................................................................. 33

WIRING DIAGRAMS .................................................................................................................36

EXPLODED VIEW AND MECHANICAL PARTS LIST............................................................... 39

PARTS LIST............................................................................................................................... 43

ASSEMBLY PARTS LIST .......................................................................................................... 60

SPECIFICATIONS ..................................................................................................................... 61

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 b uilt into the instrument by the manuf acture 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 circuitr y, 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 b y a in the schematic diag ram and the parts list. Bef ore 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

Antenna

TALK/BATT LOW LED

TALK Button

(TONE) Button

MEM (Memory) Button

MUTE Button

TALK

BATT LOW

900

MHz

COMPANDOR NOISE REDUCTION

RLD/P

TALK

ABC

GHI

JKL

PQ RS

TUV

TONE

OPER

MEM

MUTE

RDL/P (Redial/Pause)Button

FLASH

DEF

MNO

VOL/RING

FLASH Button

Dialpad

VOL/RING Button CH (channel)Button

Charging contact

BASE UNIT CONTROLS AND FUNCTIONS

RINGER OFF-ON Switch

PULSE/TONE Switch

DC IN 9V Jack

TEL LINE Jack

Rechargeable Battery Pack(back)

POWER LED

IN USE LED

CHARGE LED

PIN Button

CLOCK Button

REPEAT Button

OGM Button

Charging Contact

MIC

ALL DIGITAL ANSWERING SYSTEM

POWER

IN USE

CHARGE

CLOCK

OGM

900

CORDLESS TELEPHONE

FT-8930

PAGE

MHz

SPEAKER

Antenna

PAGE Button SPEAKER Button

ANSWER Button VOLUME Button

VOLUME Button REC TIME Switch

(ANN / 4 / 1)

VOLUME

SKIP Button

MEMO

2WAY REC

PLAY/STOP Button RING TIME Switch

(2 / 4 / TS) MEMO/2WAY REC Button DELETE Button

Base Unit

ALIGNMENT PROCEDURE

Transmitter Section

Connections

Power

Meter

Frequency

Counter

Deviation

Mater

RF Test Point

BASE Unit

J4 DC IN 9V Jack

TEL Line

Preset

Press the “PAGE” key about 3.0 seconds while truning the power on.

Alignment Procedure

step

Adjustment

RT301

(TX Po wer)

CT1

(TX Frequency)

RT3

(TX Modulation)

Connect the Po w er Meter to the RF test point on the Base MAIN PCB. Adjust RT301 for a -8.5dBm 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 ey. Connect the AF Generator to the TEL Line Jack on the Base Main PCB. Mak e sure that the output is 1 kHz -15dBm 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.

1kHz -15dBm

Jack

Remarks

AF GEN.

Adapter

AC 120V 60Hz

Alignment Point Location on Base Main PCB and Base RF PCB

Base Main PCB

RT3

Base RF PCB

RT301

RF Test Point

CT1

J1 TEL LINE Jack

J4 DC IN 9V Jack

TONE

S1 PULSE/TONE Switch

PULSE ON

S2 RINGER OFF-ON Switch

OFF

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 Test Point

DC V oltmeter

Preset

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

Alignment Procedure

step

Preset to

SG: 1mV

No modulation

SG: 1mV

1 kHz ±8kHz

deviation

SG: -113dB

No modulation

Adjustment

(Discriminator

Voltage)

(RX AF

Voltage)

µµ

µV

µµ

(SQ Point)

RT2

RT1

Remarks

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 AF test point. Adjust L4 to indicate DC

1.00 V. Connect the AC Voltmeter across a 600-ohm dummy to the Telephone Line

Jack. Adjust R T2 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 LED indication is just vibrated.

Alignment Point Location on Base Main PCB and Base RF PCB

Base Main PCB

RT1

RT2

J1 TEL LINE Jack

J4 DC IN 9V Jack

TONE

S1 PULSE/TONE Switch

PULSE ON

S2 RINGER OFF-ON Switch

OFF

AF Test Point

RF Test Point

Handset Unit

Transmitter Section

Connection

Power

Meter

Frequency

Counter

Deviation

Mater

RF Test Point

HANDSET Unit

J601 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 TALK LED lighting and beep.

Alignment Procedure

step

Adjustment

RT501

(TX Po wer)

CT601

(TX Frequency)

Remarks

Connect the RF power Meter to the RF test point on the handset MAIN PCB. Adjust RT501 for a -7.0dBm 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

MC601

J601

RT603

CT601

RF PCB

RT501

RF Test Point

Receiver Section

Connections

RF SG

DC Power Supply

Test PointSPTerminal

J601

Battery

Connector

DC 3.8V

Dummy Load

WHT BLK

AF Test Point

(150-ohm)

DC V oltmeter

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

SG: 1mV

No modulation

SG: 1mV

1 kHz ±8kHz

deviation

SG: -6.0 dBµV

1kHz ±8kHz

Deviation

Adjustment

L602

(Discriminator

Voltage)

RT602

(RX AF

Voltage)

RT601

(SQ Point)

Remarks

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 AF test point. Adjust L602 to 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 SP Terminal. Adjust RT602 for a 130 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 indication is just vibrated.

AC V oltmeterHANDSET Unit

Alignment Point Location on Handset Main PCB and Handset RF PCB

Handset PCB

J601

RT602

AF Test Point

L602

RF PCB

RT601

RF Test Point

WHT

BLK

SP Terminal

Base Unit, Main

BLOCK DIAGRAMS

B451

B301

Base Unit, DSP

Handset

2SC1623

XC612N3328MR TK1130SCL

2SC1623

MC3361CDR2

2SC2714-Y

IC603 LA8634VU

UC 2536

MB89177PF-G-295-BND-U

2SA812

2SC1623

B501

SCHEMATIC DIAGRAMS

Base Unit, Main

B301

RF MODULE

Base Unit, Key

Handset

TROUBLESHOOTING HINTS

1. The bell does not ring.

Check RINGER ON/OFF SW on Base to ON position.

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 IC2?

Is there pulse wave at pin 21 of IC11?

Check IC11 and its peripheral circuit.

Set RINGER ON/OFF SW on Base ON Position.

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

Check IC2 and TEL network circuit.

Check R78,R82 and R94.

If you want to reset the unit to the factroy settings

You can cancel the OGM, PIN, and the clock settings by the following process. 1 Disconnect the AC adaptor and telephone line cord from the base. Keep the AC adaptor connected to the wall

outlet. Make sure that the telephone line cord remains disconnected during this procedure.

2 Set the TONE/PULSE switch to TONE mode. While pressing the DELETE button, plug the AC po wer adaptor

into the base. Keep pressing the DELETE button for more than 4 seconds. A beep sounds and “ P” blinks in the LED display.

To resume using the unit, connect the telephone line cord and place the handset on the base.

Note: If you turn on the unit again, “ P” may flash.

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 pin24 of IC11 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 38 of IC604 be seen?

At the Q608 collector, can the pulse wave be seen?

Check RINGER SP601.

Check DSP unit.

Check IC604.

Check R654, R656, R657, Q609, Q608 and D602.

Check IC11 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.

Set the base in the test mode 3, check whether deviation of the TX data is app. 9.0 kHz Dev.

Set the base in the test mode 8, 902.952467 MHz (250 Hz ±8 kHz Dev.) 1mV output signal from RF test point is applied. Does the CHARGE LED light?

NGACheck IC11 and its

peripheral circuit.

Check base RF unit.

NG Check whether there is a

250 Hz data wav eform at “MOD” of RF unit.

Check base RF unit.

NG Check whether there is a

250 Hz data wav eform at RT2 AF test point.

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

Check RT3, R30, R76,

R77, R91, R49, C122, C33 and C52.

Check IC3, Q1 and their

peripheral circuit.

Check RT2, Q2 and their

peripheral circuit.

Check base RF unit.

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 38 of IC11.

Check IC11 and its peripheral circuit.

Check IC604 and its

peripheral circuit.

Check handset RF unit.

Check IC1 and its

peripheral circuit.

Set the handset in the test mode 3, check whether deviation of the TX data is app. 9.0 kHz Dev.

Set the handset in the test mode 6, 926.997467 MHz (250 Hz ±8 kHz Dev.) 1mV output signal from RF test point 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 “MOD” of RF unit.

Check handset RF unit.

Check whether the 250

Hz data waveform from pin 9 of IC601 is fed.

Check whether there is a 250 Hz data wav eform at the Q602 collector.

Check whether there is a 250 Hz data wav eform at pin 40 of IC604.

Check RT603, R641,

R642, R643, R644, R645 and C653.

Check IC601, Q601 and

their peripheral circuit.

Check RT602, Q602 and

their peripheral circuit.

Check R628, R629,

IC603 and their peripheral circuit.

Check handset RF unit.

Check IC604 and its peripheral circuit.

4. Cannot make a phone call (pulse).

Can the base and handset be connected?

While in TALK MODE, press dial key of the handset. Check whether square waveform from pin 13 of IC11 is fed.

Check Q17, RL1 and their peripheral circuits.

See 3. The base and handset cannot be connected.

Check IC11.

5. Cannot make a phone call (tone).

Can the base and handset be connected?

See 3. The base and handset be cannot be connected.

While in TALK MODE, press dial key of the handset. Can tone waveform from Pin 1 of IC11 is fed?

Can tone signal be heard from the handset speaker?

Check the base TEL-line circuit and RELAY control circuit.

Check IC11.

Check IC4, Q3 and their peripheral circuits.

6. Voice cannot be transmitted to other party (outgoing call).

Can the base and handset be connected?

The 1 kHz, 9.0mV sine waveform is applied to

MC601 sine waveform from pin 24 of IC603 be fed?

Check whether there is the 1 kHz sine waveform at pin 20 of IC603.

Check whether there is the 1 kHz sine waveform at “MOD” RF unit.

TX output signal from the handset is detected by the liner detector, can the 1 kHz sine waveform be fed?

side, can the 1 kHz

See 3. The base and handset cannot be connected.

Check Q604 and its peripheral circuit.

Check IC603 and its peripheral circuit.

Check RT603 and its peripheral circuit.

Check handset RF unit.

Check whether there is the 1 kHz sine wave f o rm at pin 9 of IC3 on the base unit.

Check whether there is the 1 kHz sine wave f o rm at pin 3 of IC1.

Check whether there is the 1 kHz sine waveform at pin 6 of IC1.

Check whether there is the 1 kHz sine waveform at the Q3 collector.

Check whether the 1 kHz sine waveform from TEL-line output is fed.

Check MC601 of handset.

Check IC3, Q1 and their peripheral circuit.

Check RT2, Q2 and their peripheral circuits.

Check IC1 and its peripheral circuit.

Check IC4, Q3 and its peripheral circuit.

Check T1, RL1 and their peripheral circuits.

Check base RF unit.

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