Daewoo DV6T712D Manual de usuario

S/M No. : VTB712DET0

Service Manual

MODEL: DV6T712D / DV6T112D

DV6T712P / DV6T112P

DV6T712S / DV6T112S

DV6T722D

DV6T722P

DV6T722S

DAEWOO ELECTRONICS CO., LTD.

Nov. 2002

http : //svc.dwe.co.kr

VCR

DVD

REPEAT

OPEN/CLOSE

DISPLAY

TITLE/PBC

OUTPUT

REC

PROGRAM

CLK/CNT

SPEED/ANGLE

TRACKING

TV/VCR

MARK

SYSTEM

PLAY/PAUSE NEXT

ZOOM AUDIO SUBTITLE

RETURN/OK

CLEAR/3D

SETUP

ENTER

✔

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............................................................................................................................25

CIRCUIT DIAGRAM..................................................................................................................28

PCB CIRCUIT BOARD..............................................................................................................34

INSTRUMENT DISASSEMBLY...............................................................................................37

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

CONTENTS

SPECIFICATIONS

DVD Audio output standards

Power 230V~, 50Hz

Consumed electricity Hi-Fi : 24W, Mono : 23W

Weight 5.7kg

Dimension (W x H x D) 430mmx91mmx355.5mm

Operative temperature +5°C~40°C

Installation condition Horizontal / Relative humidity under 80%

Signal type PAL/SECAM/MESECAM 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): -8.8dBm(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 (12mm), CD (8mm), 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 year

Persistence in power failure 1min

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

Resolution VCR Over 240 lines (Standard recording)

DVD Over 500 lines (Playback DVD)

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

• DVD one-touch record function

• Watching DVD for recording broadcast

• Integrated remote control (VCR, DVD)

• VISS function

• Multiplex sound playback/record (Hi-Fi Model)

• High Sound Quality of 6 head Hi-Fi (Hi-Fi Model)

• 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)

ADVANTAGES OF THIS PRODUCT

• 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.

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

You can select and display OSD in 7 languages. (E/F/S/G/I/D/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 12 languages. In the case of SVCD or VCD, it depends on the disc.

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

• Multi Subtitle function (DVD)

The subtitle can be seem in up to 12 languages. In the case of SVCD or VCD, it depends on the disc. (The

number of audio 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 trance during the first part test of POWER circuit.

Check IC601,IC701.

No power

POWER cord is ok?

Is 400~200V 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,L801,L802,D801.

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 IC601.

YES

A. LED DISPLAY

TROUBLESHOOTING

No power compensation.

Voltage of power fail (IC601

pin#3) at micom is 0.7V over?

More than 3.2V is maintained

for 1 minutes at IC601 pin#37

during Power Cord Open.

Check R644.

YES

B. No power compensation.

YES

Check RESET circuit.

Exchange IC601.

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 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 Q156, Q157.

D. No broadcasting signal received

YES

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