Daewoo DV-6T812N Bedienungsanleitung

S/M No. : VTB812NET0

Service Manual

MODEL: DV6T812N

DV6T512N

DAEWOO ELECTRONICS CO., LTD.

Nov. 2002

http : //svc.dwe.co.kr

✔

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).

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

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

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

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

CIRCUIT DIAGRAM.........................................................................................................................25

PCB CIRCUIT BOARD.....................................................................................................................31

INSTRUMENT DISASSEMBLY......................................................................................................34

ELECTRICAL PARTSLIST................................................................................................................40

CONTENTS

SPECIFICATIONS

DVD Audio output standards

Power AC 120V, 60Hz

Consumed electricity 24W (supplementary 2.5W)

Weight 5.7kg

Dimension (WxHxD) 430mmx91mmx355.5mm

Operative temperature +5°C~35°C

Installation condition Horizontal / Relative humidity under 80%

Received channels VHF: 2-13 CH / UHF: 14-69 CH / Cable: 1-125

Signal type NTSC COLOR

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

VIDEO input 1.0 Vp-p unbalanced, RCA JACK

AUDIO input -8.8dBm, RCA JACK

VHF output 3 or 4 CH

VIDEO output (

common use of DVD and VCR

) VIDEO output terminal, 1.0 Vp-p unbalanced, RCA JACK

VIDEO output (DVD only) S-VIDEO output (75ΩIn load Y: 1.0Vp-p, C:0.286Vp-p)

COMPONENT output (75ΩIn load Y: 1.0Vp-p, Pb:0.7Vp-p, Pr:0.7Vp-p)

AUDIO output (

common use of DVD and VCR

)

Audio output terminal (2 kinds): -8.8dBm(VCR), 2.0Vrms(DVD), RCA JACK

AUDIO output (DVD only) Analogue AUDIO output (2 CH): 2.0Vrms

Digital audio output (COAXIAL)

Playable tape Very high dense tapes with VHS marks

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

Tape speed Standard: 33.35mm/s, 3 times: 11.12mm/s

Playtime Standard: 2hrs, 3 times: 6hrs (use of T120tape)

Clock display 12 hrs AM/PM

Time Recording 8 programs a year

Persistence in power failure 1min

VIDEO S/N (VCR) Over 45dB(Standard recording)

Resolution VCR Over 220 lines (Standard recording)

DVD Over 500 lines (DVD Disc PLAY)

AUDIO (VCR) Over 65dB(Hi-Fi), over 40dB(Mono)

AUDIO (DVD) 90dB

AUDIO dynamic range 90dB

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

ADVANTAGES OF THIS PRODUCT

• DVD, VCD, CD, CD-R(MP3), CD-RW, VHS playback function

• DVD one-touch record function

• Watching DVD for recording broadcast

• Integrated REMOTE (VCR, DVD)

• Ultra power savings : less than 3W for stand-by mode

• VISS function

• Multiplex sound playback/record

• High Sound Quality of 6 head Hi-Fi

• One Touch timer Recording (OTR)

• MP3 file playback function (CD-R disc having records of MP3 files)

• GUI (Graphical User Interface) 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

This unit has 27MHz / 10bit capability, that enables the faithful reproduction of fine images.

• High bit / high sampling with 96KHz / 24bit audio D/A converter

With this 96KHz / 24bit linear Pulse Code Modulated signals, which constitute the highest specifications in the DVD standards, you

can enjoy faithfully reproduced sound in all of its various modes. To support 96KHz sampling / 24bit sound, the shaping noise of this

multi-level digital sigma type of D/A converter is kept flat up to 44KHz, thus preventing the important audio signals from being

affected.

• Coaxial digital 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 out (x1)

• S-Video out (x1)

ADVANTAGES OF THIS PRODUCT

• Slow Forward / reverse (DVD) playback

• Fast Forward / reverse playback

• Searchoftitle,chapter, andtimein DVD disc,andsearchoftrack and timeinVCD 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 and chapter for DVD, track and disc 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.

• 7 languages OSD (On Screen Display) function (DVD)

You can select and display OSD in 7 languages.

• 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 12 languages. In the case of SVCD or CVD, it depends on the disc. (The number of audio

languages depends on the software.)

• Multi Subtitle function (DVD)

The subtitle can be seen in up to 12 languages. In the case of SVCD or CVD, 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)

• Thumbnail view function (in VCD with inactivated PBC)

TROUBLESHOOTING

1. POWER CIRCUIT

✓ CAUTION

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

Check IC601,IC701.

No power

POWER cord is ok?

Is 200V~140V voltage

obtained at C805 +?

Output voltage of 2nd

parts is normal?

Check

rectifier diode of 2nd parts ;

D821, D822, D823, D825,

D826, D827.

Switching

pulse of IC801 pin#4 or

pin#5 is normal?

Exchange POWER CORD

Check F801.

Exchange rectifier diode of

2nd parts ; D821, D822, D823,

D825, D826, D827.

Check IC801.

YES

2. SYSTEM CIRCUIT

TROUBLESHOOTING

No LED display.

Is 5V obtained at IC701

pin #9, 25?

Oscillation at IC701 pin #1?

Specific GRID/SEG doesn’t

function.

Check R705, L601.

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

SEG output at PORT of IC701?

Exchange IC701.

YES

A. LED DISPLAY

TROUBLESHOOTING

No power compensation.

Voltage of power fail (IC601

pin#100) at micom is 0.7V over?

More than 3.2V is maintained

for 1 minutes at IC601 pin#37

during Power Cord Open.

Check R625.

YES

B. No power compensation.

YES

Check RESET circuit.

Exchange IC601.

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 IC601

pin#97?

Check IC601.

Noise appears on the screen

even though changing tape.

Re-adjust the height of AC

HEAD. Remove the dust.

Check C651, C652, R651~R653

IC601 pin #91, 92, 98.

Re-adjust PATH.

C-1. Bad playback quality (1)

YES

TROUBLESHOOTING

Noise appears on the Full

playback screen.

Are SW pulse and HA SW

normal?

Recheck step C-1 (Bad

playback quallty (1)).

Check HEAD AMP connector

and HEAD.

YES

ENVE Wave at PT01 pin #4?

Check VIDEO circuit.

Are there SW, HA SW pulse at

IC601 pin #16, 18?

Check PCB Pattern.

Check IC601.

C-2. Bad playback quality (2)

No broadcasting signal

received

Is the output at IC601 pin#

71(CLK), 72 (DATA) normal?

Is SIF,Video output at

TMI(RF101) pin#18,20 normal?

Check IC 601.

Check IC301.

Check IC601.

YES

Is Video Signal input at IC601

pin#50?

Is there Video output at IC601

pin#52?

Check TMI (RF101) Block.

Check Video Buffer Q101

D. No broadcasting signal received

YES

TROUBLESHOOTING

Cassette tape isn’t

inserted.

Is 5V voltage obtained at

Loading parts IC604 pin#82?

Is 13V voltage obtained at

Capstan Motor pin#8?

Check at ON/OFF 12.

Check (D822, Q821).

Connect Capstan and Loading Motor.

Check connector and Capstan Motor.

YES

Is 12V voltage obtained at Each

parts of Loading Motor?

Replace Loading Motor.

Check D851 and POWER circuit.

E. No CASSETTE Loading

YES

F. AUTO STOP in Playback mode

VCR stops automatically

in playback mode.

Check R656,C659 and P603 pin#11

Check P502 connector.

Check S603, S604 REEL Sensor.

Is D.PG/FG pulse at IC601

pin#90 normal ?

Is C. FG pulse at IC601

pin#87 normal ?

Is there REEL Pulse at IC601

pin#79, 80?

Check and replace IC601.

YES

Check C.FG(R665, C660)

and P603 pin#1.

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