Daewoo DV-K821, DV-K811, DV-K841 Service Manual

S/M No. : VK811PSEF0

Service Manual

Video Cassette Recorder

ALL K50-MECHA (Hi-Fi/MONO)

Model: (PAL/SECAM MODELS) DV-K811 / K411 / K211 Series DV-K821 / K421 / K221 Series DV-K841 / K441 / K241 Series DV-K861 / K461 / K261 Series DV-K871 / K471 / K271 Series DV-K891 / K491 / K291 Series DV-K9A1 / K4A1 Series

DV-K811D

DV-K831D

F2GHA0

DV-K861D

DV-K891D

DAEWOO ELECTRONICS CO., LTD.

http : //svc.dwe.co.kr

Jan. 2000

TABLE OF CONTENTS

SAFETY&PRECAUTIONS................................................................................................ 2

EXTERNAL VIEWS......................................................................................................... 4

FRONT VIEWS FUNCTION.................................................................................................................... 4

REAR VIEWS FUNCTION...................................................................................................................... 6

ELECTRICAL ADJUSTMENT............................................................................................ 7

SPECIFICATIONS ......................................................................................................... 8

VOLTAGE CHART ........................................................................................................ 9

CIRCUIT DIAGRAM...................................................................................................... 13

POWER CIRCUIT DIAGRAM ................................................................................................................. 13

SYSCON CIRCUIT DIAGRAM............................................................................................................... 14

A/V CIRCUIT DIAGRAM (PAL)............................................................................................................... 15

A/V CIRCUIT DIAGRAM (SECAM)......................................................................................................... 16

PIF CIRCUIT DIAGRAM ........................................................................................................................ 17

HI-FI & SW CIRCUIT DIAGRAM............................................................................................................. 18

SW CIRCUIT DIAGRAM ....................................................................................................................... 19

SHUTTLE / PATH JIG DIAGRAM............................................................................................................. 20

WAVEFORMS ON VIDEO CIRCUIT ................................................................................ 21

COMPONENTS LOCATION GUIDE ON PCB BOTTOM VIEW ............................................ 24

PCB MAIN.......................................................................................................................................... 24

DISASSEMBLY ............................................................................................................. 25

PACKING ASS’Y ................................................................................................................................. 25

FRONT PANEL ASSEMBLY ................................................................................................................... 26

INSTRUMENT DISASSEMBLY ................................................................................................................. 30

ELECTRICAL PARTS LIST ............................................................................................... 36

PCB MAIN AS .................................................................................................................................... 36

TABLE OF DIFFERENT PART LIST FOR PCB MAIN AS .............................................................................. 48

APPENDIX

TROUBLE SHOOTING FLOW CHART .............................................................................. 1

POWER CIRCUIT................................................................................................................................. 1

PIF CIRCUIT........................................................................................................................................ 3

SERVO-SYSCON CIRCUIT.................................................................................................................... 4

AUDIO CIRCUIT (NORMAL) ................................................................................................................. 12

VIDEO CIRCUIT .................................................................................................................................. 15

µ-COM PORT.............................................................................................................. 22

SERVICE MODE .......................................................................................................... 26

SAFETY&PRECAUTIONS

SAFETY CHECK AFTER SERVING

Examine the area surrounding the repaired location for damage or deterioration. Observe that screw, parts and wires have been returned to original positions. Afterwards, perform the following tests and conform the specified values in order to verify compliance whit safety standards.

1. Insulation resistance test Confirm the specified insulation resistance between power cord plug prong and externally exposed parts of the set (RF terminals, antenna terminals, video and audio input and output terminals, microphone jacks, earphone jacks, etc.) isgreater than values given in table 1 below.

2. Dielectric strengthen test Confirm specified dielectric strengthen between power cord plug prongs and exposed accessible parts of the set (RF terminals, antenna terminals, video and audio input output terminals, microphone jack, ear phone jacks, etc.) is greater than values given table 1.

3. Clearance distance When replacing primary circuit component, confirm specified clearance distance (d), (d’) between soldered terminals, and between terminals and surrounding metallic parts. See table below.

Rating for selected areas

AC Line Voltage Region

100V Japan

110 to 130V

* 110 to 130V

200 to 240V

* : Class model only

USA & Canada

Latin America

Europe

Australia

Insulation

Resistance

¡Ã1§Û

/500V DC 1

- 900V AC 1min.

¡Ã10§Û

/500V DC 4§Ç AC 1min.

Dielectric

Strength

§Ç

AC 1min.

Clearance

Distance(d),(d)

¡Ã

3.2

¡Ã

6(d)

¡Ã

8(d’)

(a :Power cord)

NOTE

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

SAFETY&PRECAUTIONS

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 output terminals, microphone jacks, earphone jacks, etc.) Measuring method:(Power ON) Insert load Z between B(earth ground, power cord plug prongs) and exposed accessible parts. Use on AC voltmeter to measure across both terminals of load Z. See figure2 and following table.

Leakage current ratings for selected are as

AC Line Voltage Region Load Z Leakage Current(i) Clearance Distance(d),(d’)

100V Japan

§Ú

15k

110 to 130V USA &Canada

110 to 130V 200 to 240V

Europe

Australia

§Þ

§Ú

NOTE

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

i ¡Â1§Ì

i ¡Â

i ¡Â2§Ì

i ¡Â

i ¡Â1§Ì

rms

0.5§Ìrms

0.7§Ìpeak dc

0.7§Ì peak dc

Exposed accessible parts

Antenna earth terminals

Other terminals

EXTERNAL VIEWS

1. FRONT VIEWS FUNCTION

DV-K811D FRONT VIEW

DV-K821D FRONT VIEW

DV-K831D FRONT VIEW

DV-K841D FRONT VIEW

DV-K861D FRONT VIEW

DV-K871D FRONT VIEW

EXTERNAL VIEW

DV-K891D FRONT VIEW

DV-K9A1D FRONT VIEW

POWER REWIND / REVIEW

STOP / EJECT FAST FORWARD / CUE RECORD PLAY BACK FRONT VIDEO/AUDIO INPUT JACK CHANNEL UP / DOWN

EXTERNAL VIEWS

2. REAR VIEWS FUNCTION

MONO 1 SCART TYPE REAR VIEW

MONO 2 SCART TYPE REAR VIEW

HI-FI 2 SCART TYPE REAR VIEW

MONO RCA TYPE REAR VIEW

HI-FI RCA TYPE REAR VIEW

ELECTRICAL ADJUSTMENT

1. PLAYBACK PHASE

ITEM MODE

6.5H

ADJUSTMENT

PCB : MAIN - TOP VIEW

PLAY [REC] BUTTON

TMI BLOC

P50

ADJUSTMENT

POINT

CHECK POINT

PIN 4 & PIN 5

OF P504

TEST

EQUIPMENT

OSCILLOSCOPE DP-2 NO SIGNAL

TEST TAPE

ADJUSTMENT PARTS MEASURING POINT

OSCILLOSCOPE

PREAMP

TO PATH JIG

CH1 CH2

INPUT

SIGNAL

PATH JIG

ADJUSTMENT PROCEDURE

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

2. Set the oscilloscope to the CHOP mode. Connect CH1 to the SW PULSE (PIN 4 of P504)

3. Connect CH2 to the ENVE signal (PIN5 of P504)

4. Insert PATH JIG and press "REC" button on the remote control.

5. Check the position of the V-sync from the rising edge of the SW pulse. (Standard : 6.5H ± 0.5H)

SPECIFICATIONS

GENERAL

Power Requirement Power Consumption Temperature

Operating position Dimensions (W x H x D) Weight Format Tape Width Tape Speed

Maximum Recording Time with full-size cassette

VIDEO

Signal system Recording system

Input Output Signal-to-Noise ratio

Horizontal resolution

AUDIO

Recording system Input Output

Frequency Range Signal to Noise Ratio Audio Distortion

TUNER

Tuning system RF Output

TIMER

Memory programmable Back up time Clock exactness

ACCESSORIES

Provided Accessories Remote control unit, RF Cable, Battery

AC 230V, 50Hz Max. 19W (in REC mode) 5×C ~ 35×C (Operating)

-20×C ~ 60×C Horizontal only 360 x 90 x 288 (mm) Approx. 3.85 Kg VHS standard

12.65mm (SP) : 23.39mm/sec (LP) : 11.70mm/sec (SP) :240min, with E-240 video cassette (LP) :480min, with E-240 video cassette

PAL/SECAM colour and CCIR monochrome signals, 625 lines/50 fields Rotary two-head helical scan with a slant double-azimuth combination video head

1.0Vp-p, 75ohms, unbalanced

1.0Vp-p, 75ohms, unbalanced 45dB (Rhode & Schwarz noise meter) with NETTETE IMAGE control at center position 240 lines with NETTETE IMAGE control at center position

Longitudinal track

-8dBm, (CENELEC standard),more than 47 k-ohms, unbalanced

-6dBm, (CENELEC standard), less than 1k-ohms, unbalanced(100k-ohms, load) 100Hz to 8,000Hz More than 38dB Less than 3% (SP)

Voltage synthesized tuner Programmable V/S 99CH (Hyper band) UHF channel 21~69 (52)

99 CH Less than 1 Hour In accordance with the exactness of power supply frequency (50Hz)

Design and specification can be subjected to change without notice.

CHANNEL COVERAGE

SECAM-L

SYSTEM

CHANNEL

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

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

VHF Ch 2~12

UHF Ch 21~69

CATV Ch X,Y,Z S1~S41

INPUT/OUTPUT JACK TYPE

Model

Jack Type

EUROPE Asia, South Africa, Australia

SCART Type RCA Jack (Phone Jack)

PAL-I

UHF Ch 21~69

VOLTAGE CHART

SECAM.L IC (IC361, TA1238N)

PIN NO. REC PB

1 2.48 2.49 2 2.72 2.4 3 2.97 2.96 4 4.1 4.12 5 5.05 5.06 6 4.68 4.69 7 4.75 4.74 8 0 0

9 0.56 0.56 10 0 0 11 3.27 3.27 12 1.84 1.89 13 3.44 3.45 14 0 0 15 1.9 1.9 16 3.24 3.24 17 5.03 5.04 18 2.55 2.65 19 1.74 1.73 20 0 0 21 2.63 2.63 22 2.61 2.63 23 3.45 1.86 24 2.57 2.57

PDC/VPS IC (IC151, LC74793)

PIN NO. REC PB

1 0 0 2 2.64 2.68 3 2.68 2.72 4 0 0 5 0 0 6 3.7 3.7 7 3.9 3.9 8 4.98 5.12

9 0 4.74 10 0 0 11 1.63 3.18 12 1.63 3.18 13 0.82 1.35 14 0.01 0.01 15 5.09 5.12 16 2.75 3.02 17 2.55 2.57 18 4.67 4.72 19 5.01 5.02 20 4.99 5.06 21 0 0 22 3.74 3.79 23 5.05 5.11 24 5.08 5.13

EEPROM (IC503, ATM24C16)

PIN NO. REC PB

1 0 0 2 0 0 3 0 0 4 0 0 5 3.9 3.9 6 3.9 4 7 0 0 8 5.24 5.29

MOTOR DRIVE IC (IC502, KA3082)

PIN NO. REC PB

1 0 0 2 0.55 0.55 3 8.78 0.88 4 6.24 6.24 5 0.01 0.01 6 0.01 0.01 7 12.12 11.74 8 12.12 11.74 9 0.91 0.91

10 0.55 0.55

VOLTAGE CHART

A/V ICHIP IC (IC301, LA71594M)

PIN NO.

1 2.5 2.5 26 0 - 51 1.9 1.9 76 2.5 2.5 2 2.5 2.5 27 - - 52 2.4 2.4 77 - 0 3 2.5 2.5 28 - - 53 0 0 78 2.5 2.5 4 2.5 2.5 29 0.8 0.8 54 2.4 2.4 79 2.5 2.5 5 2.5 2.5 30 0 1.0 55 5.0 5.0 80 2.5 2.5 6 2.5 2.5 31 2.1 2.1 56 0.5 0.5 81 0 0 7 2.5 2.5 32 1.8 1.8 57 3.4 3.4 82 4.1 1.8 8 0 0 33 2.0 2.0 58 5.0 5.0 83 0 0

9 0 0 34 1.8 1.8 59 3.4 3.4 84 4.1 1.8 10 - - 35 3.5 3.5 60 3.5 3.5 85 4.1 1.8 11 - - 36 1.8 1.8 61 3.3 3.3 86 0 0 12 - - 37 4.9 4.9 62 3.5 3.5 87 5.0 5.0 13 1.5 1.5 38 1.8 1.8 63 4.0 4.0 88 4.1 1.8 14 1.7 1.5 39 4 4 64 2.2 2.2 89 0 0 15 2.2 2.2 40 5 5 65 2.4 2.4 90 4.1 1.8 16 5 5 41 2.7 2.7 66 2.8 2.8 91 4.1 1.8 17 0.05 3 42 3.0 - 67 4.0 4.0 92 1.6 18 2.1 1.8 43 1.9 1.9 68 0 0 93 - 19 2.1 2.1 44 - - 69 2.0 2.0 94 0.7 0.5 20 2.8 2.8 45 1.8 1.8 70 2.0 2.0 95 0 0 21 2.1 2.1 46 1.9 1.9 71 2.5 2.5 96 2.5 2.5 22 0 0 47 2.0 2.0 72 2.5 0.3 97 0 0 23 - - 48 2.3 2.3 73 2.5 2.5 98 2.5 2.5 24 - - 49 1.2 1.2 74 - 2.0 99 4.3 5.0 25 1.8 1.8 50 0 0 75 5 5 100 2.5 2.5

REC PB

PIN NO.

REC PB

PIN NO.

REC PB

PIN NO.

REC PB

A/V SW IC (IC601, LA7148M)

PIN NO.

1 5.89 5.89 10 5.47 5.47 19 2.14 2.06 28 0.09 0.09

2 0.37 0.37 11 0 0 20 2.02 1.87 29 5.25 5.25

3 0 0 12 0 0 21 1.49 1.07 30 0.09 0.09

4 0.08 0.08 13 0 0 22 1.49 1.07 31 5.26 5.26

5 5.89 5.89 14 2.14 2.14 23 2.04 1.15 32 0.09 0.09

6 0 0 15 5.05 5.06 24 0 0 33 0.09 0.09

7 0 0 16 1.73 1.73 25 3.75 3.75 34 6.11 6.11

8 9.36 9.36 17 5.05 5.05 26 4 4 35 5.25 5.25

9 5.89 5.89 18 1.73 1.73 27 0.09 0.09 36 5.89 5.89

REC PB

PIN NO.

REC PB

PIN NO.

REC PB

PIN NO.

REC PB

HI-FI IC (IC251, TDA9605H)

VOLTAGE CHART

PIN NO.

1 0 0 12 0 0.03 23 3.85 3.81 34 9.42 9.36

2 3.81 3.81 13 3.83 3.83 24 3.86 3.77 35 4.21 0.53

3 3.81 3.81 14 0 0 25 3.86 3.85 36 4.2 0.53

4 0 0 15 3.33 3.31 26 0.74 0.7 37 4.18 0.53

5 0 0 16 4.56 4.56 27 0 0 38 4.2 0.17

6 3.81 3.81 17 4.55 4.56 28 3.82 3.82 39 0 0

7 3.81 3.81 18 3.31 3.29 29 3.85 3.82 40 5.05 5.09

8 3.81 3.81 19 4.56 4.56 30 0.72 0.7 41 0.93 0.94

9 3.81 3.81 20 4.56 4.56 31 3.86 3.81 42 3.75 3.7 10 3.81 3.81 21 4.56 4.56 32 3.86 3.79 43 3.95 4 11 3.81 3.81 22 3.81 3.81 33 3.86 3.77 44 1.74 2.1

NICAM IC (IC051, MSP3417DQ)

PIN NO.

1 0.03 27 0 2 2.29 28 0 3 0.01 29 0 4 0.01 30 3.69 5 0 31 3.7 6 4.95 32 0 7 3.95 33 8.25 8 3.7 34 6.57

9 0 35 0 10 0 36 3.66 11 0 37 0 12 0 38 0 13 0 39 3.68 14 0 40 3.68 15 0 41 3.68 16 4.95 42 3.68 17 0 43 2.54 18 0.01 44 3.69 19 0 45 0 20 5.1 46 4.92 21 0 47 1.5 22 0 48 1.5 23 0 49 0

REC PB

PIN NO.

REC PB

A2 IC (MSP3407DQ)

PIN NO.

1 0.01 27 0 2 0 28 0 3 0.01 29 0 4 0.01 30 3.72 5 0 31 3.73 6 5.02 32 0 7 3.6 33 8.15 8 3.3 34 6.47 9 2.47 35 0

10 2.46 36 3.68

11 2.43 37 0 12 0.02 38 0 13 0.03 39 3.71 14 0.02 40 3.71 15 0.02 41 3.71 16 5.02 42 3.71 17 0 43 2.57 18 0.02 44 3.72 19 0.01 45 0 20 5.12 46 4.98 21 0 47 1.51 22 0 48 1.51 23 0 49 0

REC PB

PIN NO.

REC PB

VOLTAGE CHART

PIN NO.

24 1.66 50 0 25 1.69 51 2.32 26 0 52 2.26

PIN NO.

24 1.69 50 0 25 1.7 51 2.35 26 0 52 2.27

PIN NO.

TMI (RF101, LGTMI-SLQ1-S)

PIN NO.

1 4.83 4.9 7 31.9 31.9 13 4.9 0 19 1.08 0 2 0 0 8 1.91 0 14 4.9 0 20 0.23 0.03 3 3.7 3.7 9 0 0 15 0 0 21 2.43 0 4 4.85 4.9 10 0 0 16 31.9 31.9 22 2.01 0.01 5 4 3.9 11 3.9 4 17 0 0 23 2.69 0 6 0 0 12 3.7 3.7 18 0 0 24 2.74 0

REC PB

PIN NO.

REC PB

PIN NO.

REC PB

PIN NO.

REC PB

REGULATOR IC (IC802, KA431AZ)

PIN NO.

1 2.49 2.49 2 0 0 3 4.82 4.82

REC PB

CIRCUIT DIAGRAM

1. POWER CIRCUIT DIAGRAM (230V ONLY)

2. SYSCON CIRCUIT DIAGRAM

3. A/V CIRCUIT DIAGRAM (PAL)

4. A/V CIRCUIT DIAGRAM (SECAM)

5. PIF CIRCUIT DIAGRAM

CIRCUIT DIAGRAM

6. HIFI & SW CIRCUIT DIAGRAM

7. SW CIRCUIT DIAGRAM

CIRCUIT DIAGRAM

8. SHUTTLE / PATH JIG CIRCUIT DIAGRAM

SYSTEM AUTO SET PWR COMP F.AV GEMSTAR

PAL-B/G

BG/DK

PAL-B/G SECAM (FRANCE) X X PAL-BG/DK SECAM (SWISS) X O PAL-I O X PAL-I/I O O NON-PDC X X PDC1 X O PDC2 O X PDC3 O O 1 MIN. X 30 MIN. O NOT APPLIED X APPLIED O SV/V+ X G-CODE O

40um/

40um

SP/LP

PAL 4HD

PAL-I, I/I SECAM

D501 D502 D503 D504 D507 D509 D512

57um/ SECAM 4HD"

40um/ 40um SP"

40um/ 40um SP/LP

PAL 4HD O O

THE MODIFIED ITEMS COMPARING TO K30THE MODIFIED ITEMS COMPARING TO K30

HEAD/SPEED

D513 D514

PALB/G BG/DK

PAL-I, I/I SECAM

PALB/G BG/DK

PAL-I, 1/1 SECAM

1. D505 : 2 PERI OPTION (A/V IC ENABLING) => MICOM ACKNOWLEDGES BY THE IIC-DATA

2. D506 : HI-FI OPTION (HI-FI IC ENABLING) => MICOM ACKNOWLEDGES BY THE IIC-DATA

3. D507 : AUDIO DUBBING OPTION => POWER COMPENSATION OPTION

4. D508 : Q-SOUND OPTION => REMOVE

5. D510 : SQPB => REMOVE

6. D511 : SVC => REMOVE

WAVEFORMS ON VIDEO CIRCUIT

1. WAVEFORMS IN THE EE MODE(COLOR BAR INPUT)

1 Pin 36 of IC301

(SECAM color bar input :

1.0Vp-p

2 Pin 36 of IC301

(PAL color bar input :

1.0Vp-p)

3 Pin 29 of IC301

(SECAM color bar output :

2.0Vp-p)

2. WAVEFORMS OF THE LUMINANCE IN THE RECORD MODE(COLOR BAR INPUT)

(REC luminance :

300mVp-p)

6Pin 83or89 of IC301(PAL)

Pin 83or89 of IC301(SECAM)

(REC luminance :

300mVp-p)

7 Pin 21of IC301

(0.5Vp-p)

3. WAVEFORM OF THE PAL COLOR IN THE RECORD MODE(COLOR BAR INPUT)

4 Pin 29 of IC301

(PAL color bar output :

2.0Vp-p)

8 Pin 20 of Ic301

(0.5Vp-p)

Pin 57,59 of IC301

9 10 11

(300mVp-p)

Pin 61 of IC301

(400mVp-p)

Pin 28 of IC301

(C.SYNC : 2Vp-p)

WAVEFORMAS ON VIDEO CIRCUIT

4. WAVEFORM OF THE SECAM COLOR IN THE RECORD MODE(COLOR BAR INPUT)

Pin 24 of IC361

12 1413

(SECAM color input :

1.0Vp-p)

Pin 28 of IC301

(C.SYNC : 2Vp-p)

5. WAVEFORMS OF THE LUMINANCE IN THE PB MODE (DP-1 TEST TAPE)

UP : Pin 11 of IC301(color

rotary : 1Vp-p

DOWN : Pin 74 of IC301

(ENVE : 0.5Vp-p)

Pin 46 of IC301

16 17

(0.5Vp-p)

Pin 12 of IC361

(200mVp-p)

Pin 41 of IC301

(0.5Vp-p)

Pin 29 of IC301

(Video out : 2.0Vp-p)

WAVEFORMAS ON VIDEO CIRCUIT

6. WAVEFORMS OF THE PAL COLOR IN THE PB MODE (DP-1 TEST TAPE)

UP : Pin 11 of IC301(color

rotary : 0.5Vp-p)

Pin 29 of IC301

(Video out : 2.0Vp-p)

DOWN : Pin 74 of IC301

(500mVp-p)

Pin 61 of IC301

(300mVp-p)

7. WAVEFORMS OF THE SECAM COLOR IN THE PB MODE (DS-1 TEST TAPE)

Pin 57,59 of IC301

(240mVp-p)

UP : Pin 11 of IC301(color

rotary : 0.5Vp-p)

DOWN : Pin 74 of IC301

(PB color ENVE : 400mVp-p)

Pin 29 of IC301

(SECAM video out :

2.0Vp-p)

Pin 15 of IC361

(400mVp-p)

Pin 72 of IC301

(280mVp-p)

COMPONENTS LOCATION GUIDE ON PCB BOTTOM VIEW

1. PCB MAIN

DISASSEMBLY

1. PACKING ASS’Y

DISASSEMBLY

2. FRONT PANEL ASSEMBLY

DV-K811D SERIES

DV-K821D SERIES

DV-K871D SERIES

DISASSEMBLY

DV-K891D SERIES

DISASSEMBLY

DV-K841D SERIES

DV-K861D SERIES

DV-K9A1D SERIES

DISASSEMBLY

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