DAEWOO DV-F562, DV-F362, DV-F542, DV-F342, DV-F442 Service Manual

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DAEWOO ELECTRONICS CO., LTD.

Service Manual

MODEL : DV-F562/F362 Series

DV-F542/F342 Series

DV-F442/F242 Series

DV-F462/F262 Series

DV-F482/F282 Series

DV-F402/F202 Series

APR. NO : S003GBA PRINTED DATE NOV. 1996

SERVICE MANUAL FM Series

• Safety Check after Servicing

Examine the area surrounding the repaired location for damage or deterioration. Observe that screws, parts and wires

have been returned to original positions. Afterwards, perform the following tests and confirm the specified values in order

to verify compliance with safety standards.

1. Insulation resistance test

Confirm the specified insulation resistance between power cord plug prongs and externally exposed parts of the set

(RF terminals, antenna terminals, video and audio input and output terminals, microphone jacks, earphone jacks, etc.) is

greater than values given in table 1 below.

2. Dielectric strength test

Confirm specified dielectric strength between power cord plug prongs and exposed accessible parts of the set (RF

terminals, antenna terminals, video and audio input and output terminals, microphone jacks, earphone jacks, etc.) is

greater than values given in table 1 below.

3. Clearance distance

When replacing primary circuit components, confirm

specified clearance distance (d), (d') between soldered

terminals, and between terminals and surrounding

metallic parts. See table below.

Table 1: Rating for selected areas

* Class

II model only.

Note: This table is unofficial and for reference only. Be sure to confirm the precise values for your particular country and

locality.

4. Leakage current test

Confirm specified or lower leakage current between B (earth ground, power cord plug prongs) and externally exposed

accessible parts (RF terminals, antenna terminals, video and audio input and output terminals, microphone jacks,

earphone jacks, etc.)

Measuring Method: (Power ON)

Insert load Z between B (earth ground, power cord plug

prongs) and exposed accesible parts. Use an AC

voltmeter to measure across both terminals of load Z.

See figure2 and following table.

Table 2: Leakage current ratings for selected areas

Note: This table is unofficial and for reference only. Be sure to confirm the precise values for your particular country and

locality.

Fig. 2

AC Line Voltage Region

Insulation Dielectric Clearance

Resistance Strength Distance (d), (d')

100V Japan ≥ 1 MΩ/500 V DC 1kV AC 1 minute ≥ 3 mm

110 to 130V

USA &

– – –

900V AC 1 minute ≥ 3.2mm

Canada

* 110 to 130 V Europe ≥ 4 MΩ/500 V DC 3 kV AC 1 minute ≥ 3 mm (d)

200 to 240 V Australia ≥ 6 mm (d')

(a: Power cord)

AC Line Voltage Region

Earth Ground

Load Z Leakage Current (

)

(B) to:

100V Japan

i≤ 1 m A rms Exposed accessible

parts

110 to 130 V USA & i≤0.5 m A rms Exposed accessible

parts

i≤ 0.7 m A peak Antenna earth

110 to 130 V Europe i≤ 2 m A dc terminals

200 to 240 V Australia i≤ 0.7 m A peak

Other terminals

i≤2 m A dc

Fig. 1

1.5k

1.5kµF

50k

Primary circuit termimals

Chassis

Exposed

accessible

part

AC Voltmter

(high impedance)

Earth Ground

power cord plug prongsB

SPECIFICA TIONS

SYSTEM

Video signal PAL standard colour

PAL/SECAM

channel memory 40 positions

UHF output signal 30-39 CH (adjustable)

73±3dBuV

VIDEO

Input: Video Line in 1.0Vp-p

75 ohms unbalanced, sync.

negative

Output: Video line out 75 ohms unbalanced, sync.

negative

Signal to noise ratio More than 43dB (SP)

Horizontal resolution 230 lines

AUDIO

Input: Audio Line in Impedance: more than

50Kohm

–8 dBm, unbalanced

Output: Audio line out Impedance: less than 1Kohm

–6 dBm, unbalanced

Frequency response 100 Hz-8KHz

Signal to noise ratio More than 38 dB

Audio Distortion Less than 3% (SP)

TAPE TRANSPOR T

Tape width 12.65mm (1/2")

Tape speed 23.39mm/sec

Maximum recording time 180 min, with E-180 tape (EP)

FF. REW time Approx 4 min (E-180)

GENERAL

Power requirements AC 230V 50Hz

Power consumption 17W

DIMENSIONS

Set size (WxHxD) 360x90x312 mm

Carton size (WxHxD) 445x180x412 mm

Weight (gross) 5.4Kg

Channel coverage

SYSTEM

PAL,SECAM-B/G

PAL-I/I PAL,SECAM-B/G

PAL,SECAM-B/G,D/K WIDE BAND

PAL-I PAL-B/H

HYPER BAND

VHF Ch 2~12 VHF Ch 2~12 VHF LOW

UHF Ch 21~69 UHF Ch 21~69 Ch 1A~5

Channel CATV Ch X,Y,Z CATV Ch X,Y,Z UHF Ch 21~69 VHF High

SI~S41 SI~S20 Ch 5A~N11

UHF Ch 21~69

IN/OUTPUT JACK TYPE

Model EUROPE

Asia

South Africa

Australia

JACK

SCART Type

RCA JACK

TYPE (PHONE JACK)

SECTION 1. CONTROLS AND FUNCTIONS

TABLE OF CONTENTS

SECTION 1. CONTROLS AND FUNCTIONS..........................................................................................................2

SECTION 2. ELECTRICAL ADJUSTMENTS

2-1. SERVO CIRCUIT ADJUSTMENT METHOD.....................................................................................................................5

2-2. VIDEO CIRCUIT ADJUSTMENT METHOD.......................................................................................................................6

2-3. AUDIO CIRCUIT ADJUSTMENT METHOD.................................................................................................................... 12

2-4. IF MODULE CIRCUIT ADJUSTMENT METHOD ...........................................................................................................13

SECTION 3. TROUBLE SHOOTING FLOW CHART

3-1. POWER CIRCUIT.............................................................................................................................................................17

3-2. LOGIC CIRCUIT...............................................................................................................................................................19

3-3. SERVO-SYSCON CIRCUIT............................................................................................................................................. 21

3-4. AUDIO CIRCUIRT............................................................................................................................................................26

3-5. VIDEO CIRCUIT ...............................................................................................................................................................28

SECTION 4. BLOCK DIAGRAM..................................................................................................................................32

SECTION 5. CIRCUIT DIAGRAM

5-1. CONNECTION DIAGRAM CIRCUIT ...............................................................................................................................33

5-2. POWER CIRCUIT (230V ONLY)......................................................................................................................................34

5-3. POWER CIRCUIT (WIDE RANGE)...................................................................................................................................36

5-4. SERVO-LOGIC CIRCUIT.................................................................................................................................................37

5-5. LOGIC CIRCUIT (F542/F342 Series)...............................................................................................................................38

5-6. LOGIC CIRCUIT (F442/F242, F462/F262, F402(1)/F202(1) Series)...............................................................................39

5-7. LOGIC CIRCUIT (F562/F362 Series)...............................................................................................................................40

5-8. LOGIC CIRCUIT (F402(2)/F202(2) Series)....................................................................................................................... 41

5-9. A/V SW CIRCUIT I............................................................................................................................................................42

5-10. A/V SW CIRCUIT II.........................................................................................................................................................43

5-11. PIF CIRCUIT................................................................................................................................................................... 44

5-12. HEAD-AMP CIRCUIT.....................................................................................................................................................45

5-13. VIDEO CIRCUIT .............................................................................................................................................................47

5-14. OSP CIRCUIT.................................................................................................................................................................48

5-15. COLOR CONVERTER ...................................................................................................................................................49

5-16. LINEAR AUDIO CIRCUIT...............................................................................................................................................50

5-17. IF MODULE CIRCUIT ...................................................................................................................................................51

5-18. VPS CIRCUIT................................................................................................................................................................52

5-19. VPS/PDC CIRCUIT (AUTO-SET)..................................................................................................................................53

5-20. REMOCON CIRCUIT (VR-F3BC).................................................................................................................................54

5-21. REMOCON CIRCUIT (VR-F2BC).................................................................................................................................55

5-22. REMOCON CIRCUIT (VR-F2BT)..................................................................................................................................56

SECTION 6. VOLTAGE CHAR T....................................................................................................................................57

SECTION 7. COMPONENTS LOCA TION GUIDE ON PCB BOTTOM VIEW........................................65

SECTION 8. DISASSEMBLY.......................................................................................................................................... 71

SECTION 9. ELECTRICAL P AR TS LIST..................................................................................................................75

SECTION 10. OPTION T ABLE............................................................................................................................... .......92

POWER

EJECT

REC /OTR

CH/TRACK

REW FF

PLAY

STOP

PAUSE

/ STILL

STOP

PLAY

POWER

CH CH

EJECT

REC/OTR

POWER

EJECT REC/OTR

REW FF

PLAY

STOP

CH./TRACKING

FRONT

DV-F542/F342 Series

DV-F462/F262 Series

DV-F442/F242 Series

RF OUT

ANT. IN

EURO-AV

OFF

CH.H CH.L

TEST

RF OUT

ANT. IN

EURO A/V

OFF

CH.H CH.L

TEST

RF OUT

ANT. IN

EURO-AV

CH.H CH.L

TEST

RF OUT

ANT. IN

OFF

CH.H CH.L

TEST

CANAL

OFF

OUT

VIDEO AUDIO

REAR

EUROPEAN MODEL (NORMAL)

EUROPEAN MODEL (Canal+)

EASTERN EUROPEAN MODEL

AUSTRALIA/ASIA./SOUTH AFRICA/MIDDLE EAST

POWER EJECT

REC/OTR CH./TRK.

STOP PLAY

REW FF

FFREW

PLAYSTOP

RECCH

EJECT

POWER

CHANNEL

STOP

PLAY

REW

REC/OTR

EJECT

FRONT

DV-F482/F282 Series

DV-F562/F362 Series

DV-F402/F202 Series

2-2. VIDEO CIRCUIT ADJUSTMENT MENT METHOD

1. EE LEVEL

• Connection Method

• Adjustment Procedure

1) Set the TV/LINE to LINE mode.

2) Supply the Color bar signal with 100% white to the VIDEO IN TERMINAL.

3) Set the VCR to the STOP mode.

4) Connect the oscilloscope to TJ395 and trigger the scope externally with the composite synchronous signal from TJ313

5) Adjust R395 to obtain 0.5 ± 0.02Vp-p between the SYNC TIP and 100% white level.

Adj. Location Checking Point Measuring Equipment Mode Test Tape

R395

TJ313

Signal Gen, Oscilloscope –

Color Bar With 100%

TJ395 White

TJ395

R395

TJ313

TOP VIEW

IC301

0.5

_ 0.02Vpp

CH-1

OSCILLOSCOPE

CH-2

SIGNAL

GENERATOR

0.5±0.02Vp-p

TJ 395

Horizontal: 10µs/div

vertical : 0.1v/div

2-1. SERVO CIRCUIT ADJUSTMENT METHOD

1. PLAYBACK PHASE

• Connection Method

• Adjustment Procedure

1) Play back the test tape.(DP-2)

2) Set the oscilloscope to the CHOP mode. Connect CH1 to the SW PULSE (PT01 PIN

3), and CH2 to the VIDEO OUT

(TJ396) and trigger the scope with signal form CH1

3) Adjust R591 to the positive rising edge of SW PULSE at 6.5H ± 0.5H from the V-SYNC

SECTION 2. ELECTRICAL ADJUSTMENT

Adj. Location Checking Point Measuring Equipment Mode Test Tape

TJ396

DP-2

R591

PT01 PIN

Oscilloscope Play

Modulator

TJ396

CH-1

OSCILLOSCOPE

CH-2

R591

PT01

TOP VIEW

6.5H 0.5H

Horizontal: 50µs/div

Vertical: 0.5V/div

6.5±0.5H

3. PLAYBACK OUTPUT LEVEL

• Connection Method

• Adjustment Procedure

1) Playback the test tape, DP-1 Color Bar

2) Connect the oscilloscope to TJ396 and trigger the scope externally with C.SYNC signal form TJ313

3) Adjust R396 to obtain 2.0V ± 0.1Vp-p between the SYNC TIP and 100% white.

TJ396

R396

TJ313

TOP VIEW

IC301

CH-1

OSCILLOSCOPE

CH-2

PB-Y

Adjustment Parts Checking Point Measuring Equipment Test Tape Input Signal

R396 TJ396, TJ313 Oscilloscope DP-1 – –

2.0Vp-p±0.1Vp-p

TJ 396

Horizontal: 10µs/div

vertical : 0.5v/div

2. SYNC TIP FREQUENCY

• Connection Method

• Adjustment Procedure

1) Set the TV/LINE to LINE mode.

2) Supply the input signal in the OPEN state.

3) Set the VCR to STOP mode.

4) Connect the Frequency counter to TJ391

5) Adjust R391 to obtain 3.73±0.1MHz

TJ391

R391

TOP VIEW

IC301

3.73±0.1MHz

–

Frequency

Adj. Location Checking Point Measuring Equipment Test Tape Input Signal

R391 TJ391 Frequency Counter – –

5. FM DEVIATION

• Connection Method

• Adjustment Procedure

1) Set the TV/LINE to LINE mode.

2) Supply the Color bar signal with 100% white to the VIDEO IN TERMINAL

3) Record the color bar signal for a few minnutes and play it back

Then confirm that the playback Y-Signal out level is 2.0 ± 0.2Vp-p.

4) If the playback level is not 2.0V ± 0.2Vp-p, adjust the following.

5) Turn the R392 a little. Record the color bar signal for a minute, and confirm the Y-signal output level.

6) Repeat preceding steps until the playback Y-signal level becomes 2.0V±0.2Vp-p between the SYNC TIP and 100%

white level

TJ396

TJ313

TOP VIEW

IC301

CH-1

OSCILLOSCOPE

CH-2

SIGNAL

GENERATOR

R392

Adjustment Parts Checking Point Measuring Equipment Test Tape Input Signal

R392 TJ396 Signal Gen, Oscilloscope Blank Tape Color Bar

4. LUMINANCE RECORD CURRENT

• Connection Method

• Adjustment Procedure

1) Set the TV/LINE to LINE mode.

2) Supply the Color bar signal to the VIDEO IN TERMINAL.

3) Set the VCR to the REC mode.

4) Connect CH-1 of oscilloscope to TJ399 and GND, and trigger the oscilloscope with SYNC signal at TJ313

5) Adjust R399 until record current becomes 280 ± 5mVp-p at SYNC TIP of luminance

R399

TJ313

TOP VIEW

IC301

CH-1

OSCILLOSCOPE

CH-2

REC-Y

SIGNAL

GENERATOR

TJ399

Adjustment Parts Checking Point Measuring Equipment Test Tape Input Signal

R399 TJ399, TJ313 Signal Gen, Oscilloscope Blank Tape Color Bar

280±5mmVp-p

TJ 399

Horizontal: 10µs/div

vertical : 50mv/div

2-3. AUDIO CIRCUIT ADJUSTMENT METHOD

1. AUDIO RECORD BIAS

• Connection Method

• Adjustment Procedure

1) Set the TV/LINE to LINE mode.

2) Set the input to open mode (Without Audio input)

3) Connect the Audio level meter to both TP1 and TP2

4) After inserting a blank tape, record in SP mode.

5) Adjust R292 to obtain 3.0 mVrms.

TOP VIEW

R292

3.0mVrms

–

A/CHEAD

TP2

(–)

TP1

(+)

Audio LEVEL METER

Adjustment Parts Checking Point Measuring Equipment Test Tape Input Signal

R292

A/C Head PCB

Audio level meter Blank Tape No signal

TP1(+), TP2(-)

6. NTSC COLOR PHASE ADJUSTMENT METHOD

• Connection Method

• Adjustment Procedure

1) Playback the test tape, DN-1 NTSC COLOR BAR.

2) Connect the vector scope to video output.

3) Adjust CN15 to obtain same color burst phase and level both video out signal and burst marker in vector scope.

4) Confirm same color burst phase and level both video output signal and burst marker in vector scope.

ICN01

CN15

NTSC COLOR

PHASE

PN01

Vector

Scope

To SCART JACK

VIDEO OUT

Adjustment Parts Checking Point Measuring Equipment Test Tape Input Signal

CN15 Video Out PAL Vector Scope

DN-1

–

NTSC Color

20%

10%

120

100

0°

10°

2-4. IF MODULE CIRCUIT ADJUSTMENT METHOD

1. 32.4 MHZ TRAP (PAL, SECAM-B/G SYSTEM ONLY)

• Connection Method

• Adjustment Procedure

1) Supply +12V to PIN

6 , and GND to PIN 7 of H101

2) Connect the signal generator output to pin

8 and GND to PIN7

3) Connect the oscilloscope to check point

4) Adjust L101 to obtain minimum level at the check point.

•INPUT SIGAL TABLE

Adj. Location Checking Point Measuring Equipment Input signal

Q101 Signal gen Refer to

L101 Collector Oscilloscope the

Power supply table on page13.

32.4MHz

S/N : 97P650031A

C111

L110

IC101

R191

L103

C105

Z103

C122

Z102

Q102

C112

L108

L107

H101

1 8

L101

Q101

1 5

CH-1

OSCILLOSCOPE

CH-2

OUT

SIGNAL GEN

GND

+12V

POWER

SUPPLY

Q101

collector

#6 #7

Refer to input

signal table on

page 13.

NO Adj item

PAL,SECAM PAL,SECAM

PAL-I PAL-B/H PAL-I/I

-B/G -B/G,D/K

1 32.4MHz 32.4MHz

31.5MHz

32.4MHz

TRAP 80dBµV 80dBµV 80dBµV

TANK fm : X fm : X fm : X fm : X fm : X fm : X

2 RESONA fc : 38.9MHz fc : 38.9MHz fc : 39.5MHz fc : 36.875MHz fc :38.9MHz fc : 38.9MHz

-NT 80dBµV 80dBµV 80dBµV 80dBµV 80dBµV 80dBµV

AFT

fm : 15.625KHz fm : 15.625KHz fm : 15.625KHz fm : 15.625KHz fm : 15.625KHz fm : 15.625KHz

Coil

30% AM 30% AM 30% AM 30% AM 30% AM 30% AM

80dBµV 80dBµV 80dBµV 80dBµV 80dBµV 80dBµV

fm : 15.625KHz fm : 15.625KHz fm : 15.625KHz fm : 15.625KHz fm : 15.625KHz fm : 15.625KHz

RF 30% AM 30% AM 30% AM 30% AM 30% AM 30% AM

AGC 98dBµV

(HYPER BAND)

98dBµV 92dBµV 95dBµV 92dBµV 98dBµV

92dBµV

(WIDE BAND)

• HYPER BAND

TUNER : TEKE4-005B(120A)

TUNER : CSR1A749 TUNER : VTSS7SZ3

DT2-BV08P

5 REMARKS IF : 97PB204000 IF : 97PB209100 IF : 97PB207200

• WIDE BAND

TUNER : VTSS7SZ3

IF : 97PB207200

2. TANK RESONANT

• Connection Method

• Adjustment Procedure

1) Supply +12V to PIN

6 , and GND to PIN 7 of H101

2) Connect the signal generator output to pin

8 and GND to PIN7

3) Connect the oscilloscope to check point

4) Adjust L109 to obtain minimum DC voltage at the check point.

S/N : 97P650031A

C111

L110

IC101

R191

L103

C105

Z103

C122

Q102

C112

H101

1 8

L101

Q101

1 5

CH-1

OSCILLOSCOPE

CH-2

OUT

SIGNAL GEN

GND

+12V

POWER

SUPPLY

#6 #7

minimum

Carrier : Refer to input

signal table

on page 13.

Adj. Location Checking Point Measuring Equipment Input signal

H101 Signal gen Refer to

L109 PIN

5 Oscilloscope the

Power supply table on page13.

1615

3. AFT COIL

• Connection Method

• Adjustment Procedure

1) Connect the TEST circuit to PIN

2 of H101

2) Supply +12V to pin

6 and GND to PIN 7 of H101

3) Connect the signal Generator output to PIN

8, and GND to PIN 7

4) Connect the oscilloscope to check point

5) Adjust L110 to obtain 2.3V ± 0.15V DC at “A” point DC Voltage change rapidly.

S/N : 97P650031A

C111

L110

IC101

R191

L103

C105

Z103

C122

Q102

C112

H101

1 8

L101

Q101

1 5

CH-1

OSCILLOSCOPE

CH-2

±12V

POWER SUPLLY

GND

2.3V±0.15V

OUT

SIGNAL GEN

GND

VCC+12V

43K

33K

18K

"A"

0.01µF

0.47µF

/50V

TEST CIRCUIT

"A"POINT

#6#2

l102

Carrier : Refer to input

signal table

on page 13.

Adj. Location Checking Point Measuring Equipment Input signal

Signal gen Refer to

L110 “A” Point Oscilloscope the

Power supply table on page13.

4. RF AGC

• Connection Method

• Adjustment Procedure

1) Supply +12V to PIN

6 , and GND to PIN 7 of H101

2) Connect the signal generator output to pin

8 and GND to PIN7

3) Connect the oscilloscope to check point

4) Adjust R191 to obtain 6.0 ± 0.2V DC at check point.

S/N : 97P650031A

C111

L110

IC101

R191

L103

C105

Z103

C122

Q102

C112

H101

1 8

L101

Q101

1 5

CH-1

OSCILLOSCOPE

CH-2

OUT

SIGNAL GEN

GND

+12V

POWER

SUPPLY

#6 #7

Z102

L108

L107

Carrier : Refer to input

signal table

on page 13.

Adj. Location Checking Point Measuring Equipment Input signal

H101 Signal gen Refer to

R191 PIN

1 Oscilloscope the

Power supply table on page13.

Check each voltage on

M801(SMPS Modute)

Check voltage

C851, C856,

C853, C855

Change of the M801

Check D851, D854, Q851, Q852

Check the main

PCB circuit (+6V) &

Logic PCB circuit (-24V)

YES

B. CHECKING THE SECONDARY CIRCUIT. (Before secondary circuit open).

SECTION 3. TROUBLE SHOOTING FLOW CHART

3-1. POWER CIRCUIT

• When changing the parts which are out of order, first, remove the power plug from the socket and then discharge the

voltage across between both terminals of C807. (Use an external approximately 20KΩ resistance)

• When check the primary circuit by using the oscilloscopes insulate the oscilloscope properly (Use the isulating

transformer) and GND must be connected GND into the primary GND (But there is no connection when checking the

secondary circuit).

• When changing M801, check FUSE and Cement resistance properly.

Prepare the instrument

connecting the insulating trans.

Check F801 FUSE.

Is voltage applied to D801?

Is voltage applied to the

both terminals of C807?

Check D801, L801 & L802.

Check R802 &

M801(SMPS Module)

Check the Secondary circuit.

YES

NO output Voltage.

A. CHECKING THE PRIMARY CIRCUIT.

Digitron is lit but keys do

not operate.

Is each key pulse

applied to pin ,

and of IC701?

2 3

12 13

Check key matrix

circuit.

Check the pin serial of

pin , , , of IC701.

Power compensation

does not operated.

When mains is

unplugged is 3.6V at

pin and of IC601?

26 81

Is signal applied to

pin and of IC601?

42 43

Check IC601.

Check C623.

Check x602.

YES

23 22 21

3-2. LOGIC CIRCUIT

Digitron does

not operate.

Is+5V supplied to

pin of IC701?

Is-24 V supplied to

pin of IC701?

Are -20 and -16.5V

supplied to pin and

of G701?

Are CLK signals

supplied to pin ,

and of IC701?

1 2

Is 5V at pin of

IC701?

Check X701

Change IC701

Check M801

Is+6V supplied

from D713 cathod

Change IC701

Change X701

YES

Check M801

Check IC601

Playback picture

is not good.

Noise appears

on the screen

on the whole.

Is Enve.wavefrom

supplied to pin of

PT01

Are SW pulse and

HA SW applied to

PreAmp circuit?

Check video circuit.

Auto stop during

playback.

Is Reel pulse

applied to pin and

of IC601?

Check flow A

Is SW pulse obtained

from pin of IC601?

Check D.PG input

and connector

between deck and

main PCB.

Check pattern

Check connector, Head

Amp and Head dust.

Change head

Check reel sensor.

Is D.FG applied to

pin of IC601

Check connector and

D.FG circuits.

Check IC601.

YES

NO NO

YES

The voltage of pin

of IC601 is not

changed.

Is CTL pulse input

to pin and of

IC601

71 72

Check and

re-adjust the

Path of Deck.

Check circuit

adjacent to IC601.

Check R668, R669

C508, C509.

Check R518

and C511.

Check IC601

YES

YESNO

NO NO

Playback picture

is not good.

Noise appears

although adjusting

tracking.

Is CTL pulse applied

to pin of IC601.

Noise shakes up

and down on the

screen.

CTL HEAD height is

normal and there is

not dust.

Adjust the HEAD

height and remove

dust.

Noise appears

although change

cassette tape.

YES

3-3. SERVO SYSCON CIRCUIT

Drum M/T and Capstan M/T rotate

at regular speed. (In REC mode)

Is C. Sync applied to

pin of IC601?

Check Motors.

Check C. Sync of

VIDEO IC and Pattern

Emergency mode appears when plugging in.

(Power cord)

Is EVER 5V supplied?

Are CAM SW DATA Correct?

Check IC602.

Check IC 601.

Check power circuit.

Recheck connector

and CAM SW contact.

YES

Drum M/T loading stops.

Is Drum Motor 12V at

pin of P601 supplied?

Is pin D.FG of

IC601 supplied.

Is D.PWM (pin )

of IC601 supplied?

Check connector (P601)

and drum Motor.

Is pin of P501

input to 2V-3.5V?

Is pin of P601 2.5V?

Is pin (C.PWM)

of IC601 Supplied?

Check connector (P501)

and capstan Motor.

Check Q851 of

power circuit.

Check C505, R506, R507

and C516

Check IC601

Check D854 of power circuit.

Check circuit of R510,

R511, R512.

Check R508, R509

Check IC601

YES

Capstan M/T loading stops.

Is capstan Motor 12V

at pin of P501 supplied?

3-4. AUDIO CIRCUIT

No sound in the playback mode.

Is the output at pin

of IC201?

Is 9V applied to pin

of IC201?

Check Q204 and

power circuit.

Is 5V applied to pin

of IC201?

Is applied to pin

9V of IC201

Is there Audio output

at pin of IC201?

Is pin of IC201 GND?

Check Pattern

and AC Head.

Check IC601.

Check IC201

YES

Cassette is not

inserted.

Is drum Motor 12V supplied?

Check Q851 of power

circuit

CAM DATA are changed

when CST IN?

Is 5V applied to

pin of IC602 when CST IN?

Chek IC602

Check connector. Check DECK part.

Is 5V supplied at

pin of IC601?

Check PATTERN

Check IC601

YES

NO NO

YES

3-5. VIDEO CIRCUIT

Is video signal input

into pin and of IC151?

12 13

Is E12V supplied to

pin of IC151

Is signal output from

pin of IC151?

Is signal input into

pin of IC301?

Is signal output from

pin of IC301?

Check PIF circuit

and A/V jack.

Check ever 12V

Check IC151 and

adjacent circuit.

Check connector and

PCB pattern

Is 5V supplied to pin

and of IC301?

Check

power circuit

Check IC301

pin EE(L)/PB(H)

Check

IC601 pin

Change IC301

Is signal input from

ICS01 pin?

Is signal output from

ICS01 pin?

Check pattern,

connector and Q312.

Check osd circuit

RF out Line out

YES

NO NO

A.EE MODE PIcture N.G

YES

No sound in the playback

mode after in the record mode.

Is the signal applied to

pin of IC201?

Is 5V applied to

pin of IC201?

Is there output at

pin of IC201?

Does T201 oscillate?

Check circuit adjacent

to IC151.

Check IC601.

Check IC201.

Is the voltage above 10V

at pin of T201

Check Q201

collector:above 10V

Base:0V

Check T201

Is record current

3.0mVms?

Is 0V applied to

pin of IC201?

Clean HEAD.

Adjust Record current.

Check IC201.

Check Q202 and T201.

Check Q201.

YES

Is envelope output

ICA 01 pin?

Is signal input to

IC301 pin?

Is signal output

from IC301 pin

Is signal input

to IC301 pin?

Is color signal input

to IC301 pin?

Is composite video signal

output from IC301 ?

Check OSD circuit

Is on/off 5V supplied to

ICA 01 , pin?

Is sw pulse input to

ICA 01 , pin?

Check QA01,

QA02, QA03

Check IC301

vcc , pin

Check power

circuit

Check IC601

Change IC301

Check IC301

pin EE(L)/PB(H)

Check Q302, 303

Check QA04, QA05

Is C.signal input

to IC301 pin?

Is color signal input

to IC301 pin?

Check X402 and

adjacent circuit.

Change IC301

1 2

4 5

Check power

circuit

Check IC601

, pin

Claen head or

change head

17 18

29 24

YES

NO NO

YES

C. PB VIDEO SIGNAL N.G

Is 5V supplied to ICS01 and pins?

Check oscillation of ICS01 and pins.

Check serial data (ICS01 pins)

Change ICS01 and check OSD circuit.

Check ON/OFF +5V

Check XS01 (17.7MHz)

Check IC601.

4 5

YES

B . OSD Character N.G

20 7

YES

Check EE mode

Is luminance and color

signal output

from IC301 , pin?

Is signal input to

IC301 pin?

Is rec signal input

to ICA01 , , pin?

Check video head and

connector

Check A/V SW CIRCUIT

Is +5V supplied to

ICA01 , pin

Is rec signal input

to ICA01 pin?

Check Q308, Q310

Check power circuit

13 14 15

1 2

YES

NO NO

D. REC SIGNAL N.G

SECTION 5. CIRCUIT DIAGRAM

5-1. CONNECTION DIAGRAM CIRCUIT

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