TOSHIBA ft8859 Service Manual

FILE NO. 2B0-9907

SERVICE MANUAL

CORDLESS TELEPHONE

FT-8859

PUBLISHED IN JAPAN, Oct., 1999

CONTENTS

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

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

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

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

SCHEMATIC DIAGRAMS ......................................................................................................................... 11

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

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

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

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

WIRING DIAGRAMS................................................................................................................................. 33

EXPLODED VIEW AND MECHANICAL PARTS LIST................................................ ...... ....... ................. 36

PARTS LIST.............................................................................................................................................. 40

ASSEMBLY PARTS LIST............................................................ ...... .......................................... ... ....... .... 54

SPECIFICATIONS............ ....... .............................................................................................................. .... 55

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 situat ion for the user.

Any design alterations or additions will void the manufacturer's warranty and will further relieve the manufact urer 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 identified by a in the schematic diagram and the parts list. Before replacing any of these components, read the par ts list in this manual carefully. The use of substitute repl acement parts that do not have the same safety characteristics as specified in t he parts list may create shock, fire or other hazards.

OPERATING CONTROLS

HANDSET CONTROLS AND FUNCTIONS LCD

Liquid Crystal Display

(LCD)

REDIAL Button

TALK Button

(TONE) Button

MEM (Memory) Button

PAUSE Button

INTCOM Button

DELETE , CH Button

Charging contacts

Antenna

VOL/RING Button

SELECT Button CID (Caller ID) Button

Dialpad (0~9, and # buttons)

Dot matrix display

Number of calles

Date Time

Caller's telephone number Caller's name

Battery compartment

BASE UNIT CONTROLS AND FUNCTIONS

DC 9V IN Jack

TEL Line Jack

ALL DIGITAL CALLER ID

CORDLESS TELEPHONE

TONE Button

RDL (Redial) Button

HOLD Button

IN USE LED

FT8859

TONE/PULSE Switch Line Ringer Volume Switch

Speaker

Antenna

MEM (Memory) Button

Speed Dial Index (1 to 10) PAUSE Button

MUTE Button INTCOM LED (Green)

Speaker V olume Control INTCOM Button FLASH Button

CHARGE LED

POWER LED

Speaker LED (Green) SPEAKER Button Microphone

ALIGNMENT PROCEDURE

Test Mode For Base Unit

Press the "  " and "#" keys at the same time about 2 seconds while turning the power 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 chan ge channel: Press the "RDL" key, but if changing the step, the channel return s to the start channel.

3. To cancel Test mode: Bell rings (except for Step 6), ch arge the Hand set (except for Step 9) or Power off.

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

1VO/TX FRQ. ADJ119LLLL 2 TX MODE CHECK 2 19 L H L H 3TX DATA 319LLLL*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 9

CHANNEL DATA CHECK 10 DUPLEX 0 19 L H H H 11 INT COM MEM 19 L H H L

919HLLL*5

*1 : “0000...” (250Hz) will be fed out continuously as transmitting data. *2 : Bell rings and INTCOM LED lights when sensing SQ.

-6#= (YHU\#SXVKLQJ#RI#)/$6+#NH\#PDNHV#WRQH#FKDQJH1#+,Q#WKH#FDVH#RI#'XDO#7R QH /#FKDQJHV#DV

4Ö5Ö6Ö7Ö8Ö9Ö:Ö;Ö<Ö3Ö∗Ö&Ö41,

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

4<#Ö53Ö54Ö73Ö4Ö5Ö6Ö7Ö81111111111116:Ö6;Ö6<Ö73

Test Mode For Handset Unit

7R #SHUIRUP#WKH#7(67#PRGH/#WXUQ#WKH#SRZHU#21#E\#SUHVVLQJ#WKH#³  ´#DQG#³&´#EXWWRQV#DW#WKH#VDPH#WLPH1

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 KEY 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 3TX DATA 3 21 L H L L L *1 4 RX SENS. 4 21 H H L H L 5SQ 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 DUPLEX 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

54#Ö53Ö4<Ö73Ö4Ö5Ö6Ö7Ö81111111111116:Ö6;Ö6<Ö73

Base Unit

Transmitter Section

Connections

Preset

Place the Base unit in VCO/TX FREQ. ADJ mode in accordance with the procedure on page 3.

Alignment Procedure

step Adjutment Remarks

Power

Meter

Frequency

Counter

Deviation

Meter

RF Test Point

BASE Unit

J2 DC IN 9V Jack

TEL Line

Jack

Dummy Load

(600-ohm)

1kHz 77.6mV

Adapter

AC 120V 60Hz

AF GEN.

RT301

(TX Power)

CT1

(TX Frequency)

Connect the Power 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 Ba se 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 Base Main PCB. Make sure that the output 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 Locati on on Base Main PCB and Base RF PCB

Base Main PCB

J5 TEL LINE Jack

J2 DC IN 9V Jack

CT1

RT3

BASE RF PCB

RF TEST POINT

RT301

Receiver Section

Connections

RF SG

BASE Unit

RF Test Point

TEL Line

Jack

Dummy Load

(600-ohm)

AC V oltmeter

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 Signa l Ge nerator to t he RF t est p oint o n the Bas e MAI N PCB. Make sure that the frequency is 902.952467 MHz. Connect the DC Voltmeter to the AF test point (RT1). Adjust L1 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 Locati on on Base Main PCB and Base RF PCB

Base Main PCB

RT1

RT2

AF TEST POINT

BASE RF PCB

RT301

J5 TEL LINE Jack

J2 DC IN 9V Jack

RF TEST POINT

Handset Unit

Transmitter Section

Connection

Power

Meter

Frequency

Counter

Deviation

Meter

Test Point

RF Test Point

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.

HANDSET Unit

J603 Battery Connector

MIC+Pin

AF GEN.

1kHz 9mV

DC Power Supply

DC 3.8V

Alignment Procedure

step Adjustment Remarks

RT501

(TX Power)

CT601

(TX Frequency)

Connect the RF power Meter to the RF test point on the handset MAIN PCB. Adjust RT501 for a -7dBm 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 ou tput 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 Dev.

Alignment Point Location on Handset Main PCB and Handset RF PCB

Handset PCB

RT603

J603

RF PCB

RF Test Point

MC601

CT601

RT501

Receiver Section

Connection

RF SG

DC Power Supply

Battery

Connector

DC 3.8V

HANDSET Unit

RF Test Point

J603

Connector

AF T erminal

Dummy Load

(150-ohm)

DC Voltmeter

AC 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 beep.

Alignment Procedure

step Preset to Adjustment Remarks

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

SG: 1mV

No modulation

SG: 1mV

1kHz ±8kHz

deviation

SG: -6.0 dBµV

1kHz ±8kHz

Deviation

L603

(Discriminator

Voltage)

RT602

(RX AF

Voltage)

RT601

(SQ Point)

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. A djust L6 03 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 for a 44.7 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. Adjus t RT601 to turn to the point where the Ringer just beeps.

Alignment Point Location on Handset Main PCB and Handset RF PCB

Handset PCB

J603

Discriminator Test Point

RT602

L603

RF PCBRT601

RF Test Point

Base Unit

BLOCK DIAGRAMS

Handset Unit

Base Unit, Main

SCHEMATIC DIAGRAMS

Base Unit, Key

NOTES:

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

Handset

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 IC4?

Is there pulse wave at pin 18 of IC22?

Check IC22 and its periphe ral circuit.

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

Check IC4 and TEL network circuit.

Check R35, R65 and C49.

Deletion of the Caller ID memor y

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

1) Connect th e battery with pressing and # buttons, and keep pre ssing 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 disconne ct the battery until you hear th e confirmation beep, otherwise the da ta 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 INTCOM key of the base is pressed, does pin 32 of IC22 change from 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 Keyboard Rubber.

Check IC603.

Check R688, R689, R672, R673, R629, Q616, Q617 and D604.

Check IC22 and its peripheral circuit.

3. The base and handset cannot be connected.

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

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. 8 kHz Dev.

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

Check IC22 and its peripheral circuit.

Check base RF unit.

Check whether there is a 250Hz data waveform at C232.

Check base RF unit.

Check whether there is a 250 Hz data waveform at pin 9 of IC1.

Check whether there is a 250 Hz data waveform at the Q6 collector.

Check RT3, C234, R58 and C232.

Check base RF unit.

Check RT2, Q6 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 250Hz data waveform at p in 39 of IC22.

Check IC22 and its peripheral circuit.

Check IC603 and its peripheral circuit.

Check handset RF unit.

Check IC18 and its peripheral circuit.

+ 39 hidden pages

TOSHIBA ft8859 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

OPERATING CONTROLS

ALIGNMENT PROCEDURE

BLOCK DIAGRAMS

SCHEMATIC DIAGRAMS

TROUBLESHOOTING HINTS