Daewoo DC-A84D1D, SD-7500K, A83D1D, A24D1D, SD-7800K Service Manual

S/M No. : VTBA84PET0

Service Manual

MODEL: DC-A84D1D

DC-A84D1P DC-A84D1S DC-A83D1D DC-A83D1P DC-A83D1S DC-A24D1D DC-A24D1S DC-A23D1D DC-A23D1S

✔ Caution :

In this Manual, some parts can be changed for improving, their performance without notice in the parts list. So, if you need the latest parts information,please refer to PPL(Parts Price List) in Service Information Center (http://svc.dwe.co.kr).

DAEWOO ELECTRONICS Corp.

July. 2003

http : //svc.dwe.co.kr

SPECIFICATIONS...............................................................................................................2

ADVANTAGES OF THIS PRODUCT....................................................................................3

TROUBLE SHOOTING....................................................................................................................5

WAVEFORMS................................................................................................................................23

CIRCUIT DIAGRAM.......................................................................................................................26

PCB CIRCUIT BOARD..................................................................................................................36

INSTRUMENT DISASSEMBLY.....................................................................................................39

ELECTRICAL PARTSLIST............................................................................................................45

CONTENTS

SPECIFICATIONS

DVD Audio output standards

Disc type

DVD VIDEO-CD CD

Analogue Audio output 48/96KHz sampling 44.1KHz sampling 44.1KHz sampling Digital Audio output 48KHz sampling 44.1KHz sampling 44.1KHz sampling Optical digital audio output 48KHz sampling 44.1KHz sampling 44.1KHz sampling

Output

Power 230V~, 50/60Hz

Consumed electricity 26W

Weight 4.6kg

Dimension (W x H x D) 435mmx93mmx255mm

Operative temperature +5¡C~40¡C

Installation condition Horizontal / Relative humidity under 80%

Signal type PAL COLOR

Antenna Input/output U/V-mixed: 75Ωunbalanced

VIDEO input 1.0Vp-p (unbalanced, RCA JACK)

AUDIO input -8.8dBm, RCA JACK

VIDEO output (common use of DVD and VCR) VIDEO output terminal, 1.0 Vp-p unbalanced, RCA JACK, SCART JACK

VIDEO output (DVD only) RGB output (75ΩIn load R: 0.7Vp-p, G:0.7Vp-p, B:0.7Vp-p)

AUDIO output (common use of DVD and VCR) Audio output terminal (2 kinds): -5.8dBm(VCR), 2Vrms(DVD), RCA JACK

AUDIO output (DVD only) Analogue AUDIO output : 2.0Vrms

Digital audio output (OPTICAL, COAXIAL)

Playable tape Very high dense tapes with VHS marks

Playable disc DVD, VIDEO-CD, CD (12cm), CD (8cm), MP3, CD-R, CD-RW

Tape speed SP: 23.39mm/s, LP: 11.70mm/s

Playtime SP: 3hrs, LP: 6hrs (use of E180tape)

Clock display 24 hrs

Time Recording 8 programs a month

Persistence in power failure 1min

VIDEO S/N (VCR) Over 43dB(Standard recording)

Resolution VCR Over 240 lines (Standard recording)

DVD Over 400 lines (Playback DVD)

AUDIO (VCR) Over 65dB

AUDIO (DVD) 90dB

AUDIO dynamic range 90dB

ADVANTAGES OF THIS PRODUCT

¥ DVD, VCD, CD, CD-R(MP3), CD-RW, VHS ¥ Watching DVD for recording broadcast ¥ Integrated remote control (VCR, DVD) ¥ VISS function ¥ Multiplex sound playback/record ¥ High Sound Quality of 6 head Hi-Fi ¥ Simple record function ¥ MP3 file playback function (CD-R disc having records of MP3 files) ¥ GUI (Graphical User Interface) through OSD (On Screen Display)

By using the [DISPLAY] button on the remote control, information on the DVD/VCD/CD player and disc,

can be displayed on the TV screen. ¥ Screensaver function (DVD) ¥ 3D sound (3D sound effect using 2 speakers) ¥ High bit / High sampling with 27MHz / 10bit video encoder ¥ High bit / High sampling with 96MHz / 24bit Audio D/A Converter ¥ Coaxial, Optical digital Audio output (PCM, Dolby Digital, dts)

You can enjoy high-level digital audio by connecting with amp embedded with Dolby Digital / dts decoder. ¥ Built-in Dolby Digital decoder (DVD) ¥ Analog audio 2-channels output for DOWNMIX (x1) ¥ Composite video output (x1) ¥ Slow Forward / Reverse playback (DVD) ¥ Fast Forward / Reverse playback ¥ Search of title, chapter, and time in DVD disc, and search of time and track time in VCD and CD ¥ Various TV aspect (DVD)

4:3 for Pan and Scan, 4:3 for Letter Box, and 16:9 for Wide ¥ Repeat playback (title, chapter, and part for DVD/ track, disc, and part for VCD/CD) ¥ Selective Play (DVD/VCD/CD)

You can select and play the desired title / chapter of DVD and track of Video CD/CD in STOP mode. ¥ 10 languages OSD (On Screen Display) function (DVD)

You can select and display OSD in 10 languages. (E/ F/ S/ G/ I/ D/ R/ C/ H/ P) ¥ Parental Lock function (DVD)

This function can prevent playback of software that may be unsuitable for children. ¥ Multi Audio function (DVD)

The audio soundtrack can be heard in up to 8 languages. In the case of SVCD or VCD, it depends on the

disc. (The number of audio languages depends on the software.)

ADVANTAGES OF THIS PRODUCT

¥ Multi Subtitle function (DVD)

The subtitle can be seem in up to 32 languages. In the case of SVCD or VCD, it depends on the disc. (The number of subtitle languages depends on the software.)

¥ Multi Angle function (DVD)

This function allows you to choose the viewing angle of scenes which were shot from a number of different angles. (The number of angles depends on the software.)

¥ Screen zoom function (DVD/VCD)

TROUBLESHOOTING

1. POWER CIRCUIT

✓ CAUTION

You must use insulated transformer during the first part test of POWER circuit.

Check IC501, IC701

No power

POWER cord is ok?

Is 400V~200V voltage

obtained at C804 +?

Output voltage of 2

parts is normal?

Check

rectifier diode of 2

parts ;

D821, D822, D823, D826,

D827, D828, D830

Switching

pulse of Q801 collector is

normal?

Exchange POWER CORD

Check F801.

Exchange rectifier diode of 2

parts ; D821, D822, D823, D826,

D827, D828, D830.

Check Q801.

YES

2. SYSTEM CIRCUIT

TROUBLESHOOTING

No LED display.

Is 5V obtained at IC701

pin #9, 25?

Oscillation at IC701pin #1?

Specific GRID/SEG doesnÕt function.

Check R588, D857, L503, L860

Exchange IC701.

Check IC 701 pin #22~24, 27,

28, 30, 31.

Check IC 701 pin #10~12, 14~21.

YES

GRID output at PORT of IC701?

YES

SEGoutput at PORT of IC701?

Exchange IC701.

YES

A. LED DISPLAY

TROUBLESHOOTING

Noise appears on the

playback screen.

Is noise diminished by tracking

adjustment.

Noise band is trembled up and

down?

Re-adjust PATH.

Is the height of CTL HEAD normal?

No dust?

Is there problem in CTL Input

circuit and amplifier.

YES

Is there CTL pulse at IC501

pin#97?

Check IC501.

Noise appears on the screen even

though changing tape.

Re-adjust the height of AC HEAD.

Remove the dust.

Check C510,R545~R547

IC 501 pin #91, 92, 98.

Re-adjust PATH.

B-1. Bad playback quality (1)

YES

Noise appears on the Full

playback screen.

Are SW pulse and HA SW normal?

Recheck step B-1

(Bad playback quallty (1)).

Check HEAD AMP connector

and HEAD.

YES

ENVE Wave at P502 pin #4?

Check VIDEO circuit.

Are there SW, HA SW pulse at

IC501 pin #16, 18?

Check PCB Pattern.

Check IC501.

B-2. Bad playback quality (2)

YES

TROUBLESHOOTING

No broadcasting signal

received

Is the output at IC501 pin# 61(CLK),

62 (DATA) normal?

Is SIF,Video output at TMI(RF101)

pin#22,24 normal?

Check IC 501.

Check IC301.

Check IC501.

YES

Is Video Signal input at IC501

pin#50?

Is there Video output at IC501

pin#52?

Check TMI (RF101) Block.

Check Video Buffer Q670, Q671

C. No broadcasting signal received

YES

TROUBLESHOOTING

Cassette tape isnÕt inserted.

Is 5V voltage obtained at Loading

parts IC501 pin#2?

Is 14V voltage obtained at

Capstan Motor P501 pin#2?

Check at EVER 14V

Check Q850.

Connect Capstan and Loading Motor.

Check connector and Capstan Motor.

YES

Is 13V voltage obtained at Each

parts of Loading Motor?

Replace Loading Motor.

Check D851 and POWER circuit.

D. No CASSETTE Loading

YES

E. AUTO STOP in Playback mode

VCR stops automatically in

playback mode.

Check R544,C516 and P510

pin#11.

Check S603, S604 REEL Sensor.

Is D.PG/FG pulse at IC501

pin#90 normal ?

Is C. FG pulse at IC501 pin#87

normal ?

Is there REEL Pulse at IC501

pin#79, 80?

Check and replace IC501.

YES

Check C.FG(R543,C517) and

P510 pin#1.

TROUBLESHOOTING

F. DRUM Motor stops

G. CAPSTAN doesnÕt rotate

CAPSTAN doesnÕt rotate.

Is EVER 14V voltage obtained

at P501 pin#2?

YES

Is Capstan PWM fit to

IC501 pin#77?

Is 3.2V voltage obtained

at P501 pin#5?

Is 2.7V voltage obtained

at P501 pin#9?

Check P501 Connector and

Capstan Motor.

Check EVER 14V.

(Q850)

Check Capstan FG

(IC 501 pin# 87).

Check

R541,R540,R539,R538,C518

Check R537,R536,C521

DRUM Motor stops.

Is 14V voltage obtained at P501

pin#8?

YES

Is DRUM PWM fit to IC 501

pin#76?

Is 2.6V voltage obtained at

P501 pin#12?

Check Capstan Motor and

DRUM Motor.

Check EVER 14V

(Q850).

Check DRUM PG/FG

(IC 501 pin# 90).

Check R534,R535,C519,C520.

TROUBLESHOOTING

3. VIDEO circuit

A. EE screen doesnÕt appear

EE MODE Picture NG

Is Video signal input at

IC301 pin#48,50,52,54?

Is 5V supplied at

pin#42,55,72,91of IC301?

Is C.S, DATA, CLOCK signal input pin#67,68,69 of IC301?

Check IF and LINE IN JACK.

Check POWER circuit.

Check IC501

pin #58,71,72.

YES

Is signal output from pin#65 of

IC301?

YES

Check IC301

pin#62 Q-V Sync.

Is signal input into pin#50

of IC501?

YES

Check PCB Pattern.

Is signal output from

pin#52 of IC501?

YES

Is 5V supplied to pin#53, 98,

99 of IC501?

Is signal output at IC301

pin#61?

YES

Check PCB Pattern

Q309, Q310.

Check IC 501

YES

Check POWER circuit.

Is signal input at IC301

pin#56?

Check RF Output.

Check PCB Pattern & LINE

out.

YES

Check IC301.

TROUBLESHOOTING

B. Playback picture doesnÕt appear

YES

Is Y SIGNAL output at IC301

pin#46?

Is VIDEO SIGNAL output at IC301

pin#65?

Check and Replace IC301.

PB video signal missing.

Is Envelope output from IC301

pin#79?

Same as EE MODE check.

Is 5V supplied at IC301 pin#91?

Is SW Pulse input at IC301

pin#70?

Is 5V obtained at IC301 pin#24,

42,55,72,91?

Check POWER 5V.

Check IC601 pin#18.

Clean head or Replace head.

Check POWER 5V.

Check PATTERN

YES

Does X301(4.43MHz)

oscillate?

Is Y SIGNAL input at IC301

pin#43?

Check PATTERN

YES

Replace X301.

Check and replace IC301.

TROUBLESHOOTING

Is +5V supplied at IC301 pin#91?

YES

Is VIDEO SW Pulse input at IC301

pin#70?

Is REC signal output from IC301

pin#94,95,89,90? LP MODE: 89,90 Pin SP MODE: 94,95Pin

Check video HEAD and Connector.

Is signal input into IC301

pin# 48,50,52,54,56?

Check POWER circuit.

Check IC501 pin#18.

Record video signal poor.

Check EE MODE.

YES

Is luminance and color signal

output from IC301 pin#78?

Replace IC301.

YES

C. No recording

YES

Is IC301 pin#80 REC(H) HIGH?

Check IC501 pin#45.

TROUBLESHOOTING

Is Video signal input at IC501

pin#50?

Check POWER circuit.

No OSD appears.

Is 5V obtained at IC501 pin# 53,

98, 99?

Is Video signal output at IC501

pin#52?

Replace IC501.

D. No OSD(On Screen Display) appears

YES

Check IC 501.

Check PCB Pattern

Check FFC CABLE & DVD

Module

DVD Composite signal doesnÕt

appear

Is signal output at PD01

pin# 7?

Is signal at IC301 pin#56?

E. No DVD Video

YES

Remark previous 3-A

Is signal at IC301 pin#61?

Check IC301

Check RF output.

YES

Check Line output

TROUBLESHOOTING

4. AUDIO (Hi-Fi MODEL)

No sound in RF E-E mode

Is Audio signal output at IC601 pin

#3, 13?

A. No sound in E-E mode

a. RF E-E

Check IC501.

Is Audio signal output at IC251

pin#16,17?

Are CLK and DATA obtained at

IC251 pin#42,43?

Is 5V obtained at IC251 pin#40?

Replace IC251.

YES

Is 12V obtained at IC251 pin#34?

YES

Check POWER circuit.

YES

Replace IC601.

Is 5V obtained at IC051 pin#1?

Check Power circuit.

Is there SIF signal at IC051 pin#2

in RF mode?

Check RF101.

YES

Is there SIF signal out at IC051

pin#30, 31?

Check IC051.

YES

Comparing with switching table, are SWA, B CTL SIGNAL

right at IC601 pin #9,10?

Check Output JACK.

YES

TROUBLESHOOTING

b. AV1 E-E

No sound in AV1 E-E mode.

Check Input AV1 JACK

Is Audio signal at IC251 pin#6, 7?

Is Audio signal output at IC601 pin

#3, 13?

Check IC501.

Is Audio signal output at IC251

pin#16,17?

Are CLK and DATA obtained at

IC251 pin#42,43?

Is 5V obtained at IC251 pin#40?

Replace IC251.

YES

Is 12V obtained at IC251 pin#34?

YES

Check POWER circuit.

YES

Replace IC601.

YES

Comparing with switching table, are SWA, B CTL SIGNAL

right at IC601 pin #9,10?

Check Output JACK.

YES

TROUBLESHOOTING

c. AV2 E-E

No sound in AV2 E-E mode.

Check Input AV2 JACK

Is Audio signal at IC251 pin#8, 9?

Is Audio signal output at IC601 pin

#3, 13?

Check IC501.

Is Audio signal output at IC251

pin#19, 20?

Are CLK and DATA obtained at

IC251 pin#42,43?

Is 5V obtained at IC251 pin#40?

Replace IC251.

YES

Is 12V obtained at IC251 pin#34?

YES

Check POWER circuit.

YES

Replace IC601.

YES

Comparing with switching table, are SWA, B CTL SIGNAL

right at IC601 pin #9,10?

Check Output JACK.

YES

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