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.
http : //svc.dwe.co.kr |
July. 2003 |
CONTENTS
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 |
1
SPECIFICATIONS
Power |
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230V~, 50/60Hz |
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Consumed electricity |
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26W |
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Weight |
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4.6kg |
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Dimension (W x H x D) |
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435mmx93mmx255mm |
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Operative temperature |
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+5°C~40°C |
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Installation condition |
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Horizontal / Relative humidity under 80% |
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Signal type |
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PAL COLOR |
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Antenna Input/output |
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U/V-mixed: 75Ω unbalanced |
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VIDEO input |
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1.0Vp-p (unbalanced, RCA JACK) |
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AUDIO input |
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-8.8dBm, RCA JACK |
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VIDEO output (common use of DVD and VCR) |
VIDEO output terminal, 1.0 Vp-p unbalanced, RCA JACK, SCART JACK |
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VIDEO output (DVD only) |
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RGB output (75Ω In load R: 0.7Vp-p, G:0.7Vp-p, B:0.7Vp-p) |
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AUDIO output (common use of DVD and VCR) |
Audio output terminal (2 kinds): -5.8dBm(VCR), 2Vrms(DVD), RCA JACK |
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AUDIO output (DVD only) |
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Analogue AUDIO output : 2.0Vrms |
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Digital audio output (OPTICAL, COAXIAL) |
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Playable tape |
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Very high dense tapes with VHS marks |
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Playable disc |
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DVD, VIDEO-CD, CD (12cm), CD (8cm), MP3, CD-R, CD-RW |
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Tape speed |
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SP: 23.39mm/s, LP: 11.70mm/s |
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Playtime |
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SP: 3hrs, LP: 6hrs (use of E180tape) |
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Clock display |
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24 hrs |
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Time Recording |
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8 programs a month |
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Persistence in power failure |
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1min |
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VIDEO S/N (VCR) |
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Over 43dB(Standard recording) |
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Resolution |
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VCR |
Over 240 lines (Standard recording) |
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DVD |
Over 400 lines (Playback DVD) |
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AUDIO (VCR) |
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Over 65dB |
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AUDIO (DVD) |
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90dB |
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AUDIO dynamic range |
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90dB |
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Output |
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Disc type |
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DVD |
VIDEO-CD |
CD |
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Analogue Audio output |
48/96KHz sampling |
44.1KHz sampling |
44.1KHz sampling |
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Digital Audio output |
48KHz sampling |
44.1KHz sampling |
44.1KHz sampling |
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Optical digital audio output |
48KHz sampling |
44.1KHz sampling |
44.1KHz sampling |
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2
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.)
3
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)
4
TROUBLESHOOTING
1.POWER CIRCUIT
CAUTION
You must use insulated transformer during the first part test of POWER circuit.
No power
POWER cord is ok?
YES
Is 400V~200V voltage obtained at C804 +?
YES
Output voltage of 2nd parts is normal?
YES
Check
rectifier diode of 2nd parts ; D821, D822, D823, D826, D827, D828, D830
YES
Switching
pulse of Q801 collector is normal?
NO
Exchange POWER CORD
NO
Check F801.
NO
Check IC501, IC701
NO |
Exchange rectifier diode of 2nd |
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parts ; D821, D822, D823, D826, |
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D827, D828, D830. |
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NO
Check Q801.
YES
OK
5
TROUBLESHOOTING
2. SYSTEM CIRCUIT
A. LED DISPLAY
No LED display.
Is 5V obtained at IC701 pin #9, 25?
YES
Oscillation at IC701pin #1?
YES
Specific GRID/SEG doesn’t function.
YES
GRID output at PORT of IC701?
YES
SEG output at PORT of IC701?
NO
Check R588, D857, L503, L860
NO
Exchange IC701.
NO |
Check IC 701 pin #22~24, 27, |
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28, 30, 31. |
NO
Check IC 701 pin #10~12, 14~21.
Exchange IC701.
6
TROUBLESHOOTING
B-1. Bad playback quality (1)
Noise appears on the playback screen.
Is noise diminished by tracking adjustment.
YES
Noise band is trembled up and down?
YES
Is there CTL pulse at IC501 pin#97?
YES
Check IC501.
NO
NO
NO
Re-adjust PATH.
Noise appears on the screen even though changing tape.
Is the height of CTL HEAD normal? No dust?
Is there problem in CTL Input circuit and amplifier.
YES
Re-adjust PATH.
NO |
Re-adjust the height of AC HEAD. |
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Remove the dust. |
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YES |
Check C510,R545~R547 |
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IC 501 pin #91, 92, 98. |
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B-2. Bad playback quality (2)
Noise appears on the Full playback screen.
YES
Recheck step B-1 (Bad playback quallty (1)).
Are SW pulse and HA SW normal? |
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NO |
Are there SW, HA SW pulse at |
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NO |
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IC501 pin #16, 18? |
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Check IC501. |
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YES |
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YES |
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Check PCB Pattern. |
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NO |
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ENVE Wave at P502 pin #4? |
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Check HEAD AMP connector |
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and HEAD. |
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YES |
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Check VIDEO circuit. |
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7
TROUBLESHOOTING
C. No broadcasting signal received
No broadcasting signal received
YES
Is the output at IC501 pin# 61(CLK), 62 (DATA) normal?
YES
Is SIF,Video output at TMI(RF101) pin#22,24 normal?
YES
Is Video Signal input at IC501 pin#50?
YES 
Is there Video output at IC501 pin#52?
NO
Check IC 501.
NO
Check TMI (RF101) Block.
NO
Check IC301.
NO
Check IC501.
YES
Check Video Buffer Q670, Q671
8
TROUBLESHOOTING
D. No CASSETTE Loading
Cassette tape isn’t inserted.
Is 5V voltage obtained at Loading |
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NO |
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parts IC501 pin#2? |
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YES |
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NO |
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Is 14V voltage obtained at |
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Capstan Motor P501 pin#2? |
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YES |
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Is 13V voltage obtained at Each |
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NO |
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parts of Loading Motor? |
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Replace Loading Motor. |
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Check at EVER 14V
Check Q850.
Check D851 and POWER circuit.
Connect Capstan and Loading Motor.
Check connector and Capstan Motor.
E. AUTO STOP in Playback mode
VCR stops automatically in playback mode.
Is there REEL Pulse at IC501 |
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NO |
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pin#79, 80? |
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YES
Check S603, S604 REEL Sensor.
Is D.PG/FG pulse at IC501 pin#90 normal ?
YES
Is C. FG pulse at IC501 pin#87 normal ?
YES 
Check and replace IC501.
NO |
Check R544,C516 and P510 |
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pin#11. |
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NO |
Check C.FG(R543,C517) and |
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P510 pin#1. |
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9
TROUBLESHOOTING
F. DRUM Motor stops
DRUM Motor stops.
Is 14V voltage obtained at P501 pin#8?
YES
Is DRUM PWM fit to IC 501 pin#76?
YES
Is 2.6V voltage obtained at P501 pin#12?
YES 
Check Capstan Motor and
DRUM Motor.
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Check EVER 14V |
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(Q850). |
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NO |
Check DRUM PG/FG |
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(IC 501 pin# 90). |
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NO |
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Check R534,R535,C519,C520. |
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G. CAPSTAN doesn’t rotate
CAPSTAN doesn’t rotate.
Is EVER 14V voltage obtained at P501 pin#2?
YES
Is Capstan PWM fit to
IC501 pin#77?
YES
Is 3.2V voltage obtained at P501 pin#5?
YES 
Is 2.7V voltage obtained at P501 pin#9?
Check P501 Connector and
Capstan Motor.
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NO |
Check EVER 14V. |
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(Q850) |
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NO |
Check Capstan FG |
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(IC 501 pin# 87). |
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NO |
Check |
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R541,R540,R539,R538,C518 |
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NO |
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Check R537,R536,C521 |
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10
TROUBLESHOOTING
3.VIDEO circuit
A.EE screen doesn’t appear
EE MODE Picture NG
YES
Is Video signal input at IC301 pin#48,50,52,54?
YES
Is 5V supplied at pin#42,55,72,91of IC301?
YES
Is C.S, DATA, CLOCK signal input pin#67,68,69 of IC301?
YES
Is signal output from pin#65 of IC301?
YES
Is signal input into pin#50 of IC501?
YES
Is signal output from pin#52 of IC501?
YES
Is signal input at IC301 pin#56?
YES
Is signal output at IC301 pin#61?
YES
NO
Check IF and LINE IN JACK.
NO
Check POWER circuit.
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NO |
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Check IC501 |
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pin #58,71,72. |
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Check IC301 |
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pin#62 Q-V Sync. |
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Check PCB Pattern. |
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Is 5V supplied to pin#53, 98, |
Check POWER circuit. |
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99 of IC501? |
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Check IC 501 |
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NO |
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Check PCB Pattern |
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Q309, Q310. |
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NO |
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Check IC301. |
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Check |
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Check PCB Pattern & LINE |
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out. |
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11
TROUBLESHOOTING
B. Playback picture doesn’t appear
PB video signal missing.
YES |
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Is Envelope output from IC301 |
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Is 5V supplied at IC301 pin#91? |
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pin#79? |
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Is SW Pulse input at IC301 |
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pin#70? |
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YES |
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Is Y SIGNAL output at IC301 pin#46?
YES
Is Y SIGNAL input at IC301 pin#43?
YES 
Is VIDEO SIGNAL output at IC301 pin#65?
YES
Same as EE MODE check.
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NO |
Is 5V obtained at IC301 pin#24, |
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NO |
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42,55,72,91? |
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YES |
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Check and Replace IC301. |
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YES |
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Does X301(4.43MHz) |
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oscillate? |
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Check PATTERN |
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NO |
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Check and replace IC301. |
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Check POWER 5V.
Check IC601 pin#18.
Clean head or Replace head.
Check POWER 5V.
Check PATTERN
Replace X301.
12
TROUBLESHOOTING
C. No recording
Record video signal poor.
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Check EE MODE. |
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Is luminance and color signal |
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NO |
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output from IC301 pin#78? |
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NO |
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Is +5V supplied at IC301 pin#91? |
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NO |
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Is IC301 pin#80 REC(H) HIGH? |
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YES |
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Is VIDEO SW Pulse input at IC301 |
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NO |
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pin#70? |
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Is REC signal output from IC301 |
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NO |
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pin#94,95,89,90? |
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LP MODE: 89,90 Pin |
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SP MODE: 94,95Pin |
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Check video HEAD and Connector. |
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Is signal input into IC301 pin# 48,50,52,54,56?
Check POWER circuit.
Check IC501 pin#45.
Check IC501 pin#18.
Replace IC301.
13
TROUBLESHOOTING
D. No OSD(On Screen Display) appears
No OSD appears.
YES
Is 5V obtained at IC501 pin# 53, 98, 99?
YES
Is Video signal output at IC501 pin#52?
NO
Check POWER circuit.
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NO |
Is Video signal input at IC501 |
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NO |
Replace IC501. |
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pin#50? |
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Check IC 501. |
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Check IC 501. |
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E. No DVD Video
DVD Composite signal doesn’t appear
YES
Is signal output at PD01 pin# 7?
YES
Is signal at IC301 pin#56?
YES
Is signal at IC301 pin#61?
YES
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NO |
Check FFC CABLE & DVD |
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Module |
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NO |
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Check PCB Pattern |
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NO |
Check IC301 |
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Check RF output. |
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Check Line output |
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Remark previous 3-A
14
TROUBLESHOOTING
4.AUDIO (Hi-Fi MODEL)
A.No sound in E-E mode a. RF E-E
No sound in RF E-E mode
Is 5V obtained at IC051 pin#1?
YES
NO
Check Power circuit.
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Is there SIF signal at IC051 pin#2 |
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NO |
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in RF mode? |
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Check RF101. |
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YES |
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Is there SIF signal out at IC051 |
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NO |
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Check IC051. |
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pin#30, 31? |
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Is 12V obtained at IC251 pin#34? |
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NO |
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YES |
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Check POWER circuit. |
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Is 5V obtained at IC251 pin#40? |
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NO |
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Is Audio signal output at IC251 |
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Are CLK and DATA obtained at |
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YES |
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Replace IC251. |
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pin#16,17? |
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IC251 pin#42,43? |
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YES
Is Audio signal output at IC601 pin NO #3, 13?
YES
Check Output JACK.
Comparing with switching table, are SWA, B CTL SIGNAL right at IC601 pin #9,10?
YES |
NO |
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Replace IC601. |
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Check IC501. |
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15
TROUBLESHOOTING
b. AV1 E-E
No sound in AV1 E-E mode.
YES
Is 12V obtained at IC251 pin#34?
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NO |
Check POWER circuit. |
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YES |
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Is 5V obtained at IC251 pin#40?
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Is Audio signal at IC251 pin#6, 7? |
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NO |
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Check Input AV1 JACK |
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YES |
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NO |
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Is Audio signal output at IC251 |
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Are CLK and DATA obtained at |
YES |
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Replace IC251. |
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pin#16,17? |
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IC251 pin#42,43? |
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YES
Is Audio signal output at IC601 pin NO #3, 13?
YES
Check Output JACK.
Comparing with switching table, are SWA, B CTL SIGNAL right at IC601 pin #9,10?
YES |
NO |
|
Replace IC601. |
|
Check IC501. |
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16
TROUBLESHOOTING
c. AV2 E-E
No sound in AV2 E-E mode.
YES
Is 12V obtained at IC251 pin#34?
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NO |
Check POWER circuit. |
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YES |
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Is 5V obtained at IC251 pin#40?
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Is Audio signal at IC251 pin#8, 9? |
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NO |
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Check Input AV2 JACK |
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YES |
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NO |
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Is Audio signal output at IC251 |
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Are CLK and DATA obtained at |
YES |
|
Replace IC251. |
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pin#19, 20? |
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IC251 pin#42,43? |
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YES
Is Audio signal output at IC601 pin NO #3, 13?
YES
Check Output JACK.
Comparing with switching table, are SWA, B CTL SIGNAL right at IC601 pin #9,10?
YES |
NO |
|
Replace IC601. |
|
Check IC501. |
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17
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