Daewoo DV-T8T2NZ-QB/M User manual

Service Manual
S/M No. :VT8T2NTEF0
Sep.2000
DAEWOO ELECTRONICS CO., LTD.
http ://svc.dwe.co.kr
Video Cassette Recorder
Model:
DV-T8T2NZ-QB/M
DV-T5T2NZ-QB/M
ALLT-MECHA (Hi-Fi/MONO)
123
456
789
0
LR
DV-T5T2
DV-T8T2
VR-F2PB
✔ 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).

1
TABLE OF CONTENTS
SPECIFICATION .......................................................................................................... 2
VOLTAGE CHART ........................................................................................................ 3
CIRCUIT DIAGRAM...................................................................................................... 6
POWER SUPPLY SCHEMATIC DIAGRAM ............................................................................................... 6
SERVO/SYSCON/CBC CIRCUIT DIAGRAM(T-DECK)............................................................................... 7
VIDEO/AUDIO SCHEMATIC DIAGRAM (2/4 HEAD)................................................................................ 8
VIDEO/AUDIO SCHEMATIC DIAGRAM (Hi-Fi) ........................................................................................ 9
PIF SCHEMATIC DIAGRAM (2/4 HEAD) ................................................................................................ 10
PIF&MPX SCHEMATIC DIAGRAM (Hi-Fi) ............................................................................................. 11
WAVEFORMS ............................................................................................................. 12
INSTRUMENT DISASSEMBLY .......................................................................................... 16
ELECTRICAL PARTS LIST ............................................................................................... 21
APPENDIX
TROUBLESHOOTING GUIDES ....................................................................................... 1
POWER CIRCUIT ................................................................................................................................ 1
SERVO / SYSCON / LOGIC CIRCUIT .................................................................................................... 3
VIDEO CIRCUIT .................................................................................................................................10
AUDIO CIRCUIT (Hi-Fi MODEL) .......................................................................................................... 14
AUDIO CIRCUIT (2 / 4 HEAD MODEL) ................................................................................................. 19

2
SPECIFICATION
Note: Specifications are subject to change without notice.
Power Input 100-240 Volts AC 60Hz(Free voltage)
DV-T5T2NZ-QB/M DV-T8T2NZ-QB/M
Power Consumption 17 Watts (4-head Hi-Fi)
17 Watts (4-head)
Operating Temperature 5 degree C to 40 degree C (41 degree F to 104 degree F)
Storage Temperature -30 degree C to 65 degree C (-22 degree F to 149 degree F)
Weight 6.6 Ibs : Net (8.8 Ibs : Gross)
Dimensions 14.2 X 3.6 X9.4 Inches
Recording System
4-head Hi Fi: Four video record/playback heads Rotary helical scan
Luma: FM recording
Chroma: converted subcarrier phase shifted recording
Two audio record/playback heads
Rotary helical scan, 2 channels FM recording
4-head: Four video record/playback heads Rotary helical scan
Luma: FM recording
Chroma: converted subcarrier phase shifted recording
VideoSignal EIA standard; NTSC color
Antenna 75 ohm input impedance
Video Signal Level 1Vp-p (140 IRE standard)
Audio Input Impedance More than 47K ohm
Audio Output Impedance Less than 1.5K ohm
Tape Speed SP: 33.35mm/sec.
SLP: 11.13mm/sec
Maximum Recording Time T-60: 3 hours/ EP (SLP) mode
T120: 6 hours/ EP (SLP) mode
Fast Forward/Rewind Time 3 minutes (T-120 tape)
Tuning System Auto Program/Cable Compatible/Frequency Synthesis (FS)

3
VOLTAGE CHART
A/V CHIP IC (IC301, LA71071M)
PIN NO. REC PB PIN NO. REC PB PIN NO. REC PB PIN NO. REC PB
12.3 2.38 26 2.3 2.57 51 0.82 0.8 76 2.37 2.37
22.3 2.38 27 0 0 52 2.0 2.0 77 1.0 0
32.47 2.4 28 1.6 1.86 53 4.3 4.9 78 2.37 2.4
42.47 2.4 29 1.0 1.0 54 4.9 5.0 79 2.39 2.37
52.47 2.4 30 0 0 55 5.0 2.58 80 2.37 0
62.47 2.41 31 0 0 56 5.0 5.2 81 00.8
72.5 2.41 32 0 0 57 4.9 4.97 82 0.7 0.8
8 0 0 33 0.3 0.3 58 3.58 3.3 83 0.78 0.8
9 0 0 34 0.3 0.3 59 4.9 4.9 84 0.78 0.8
10 5.0 5.0 35 2.0 1.75 60 3.39 3.8 85 0.79 0.8
11 4.9 036 0.9 0.97 61 3.8 3.88 86 0 0
12 0 0 37 1.45 1.56 62 2.5 2.59 87 5.2 5.2
13 0.37 0.3 38 2.58 2.55 63 2.1 2.0 88 4.4 1.8
14 0.36 0.35 39 3.3 3.33 64 2.2 2.2 89 4.39 1.85
15 0 0 40 2.58 2.56 65 3.98 3.96 90 4.39 1.85
16 4.9 0.1 41 4.8 4.8 66 2.0 1.56 91 4.4 1.85
17 4.94 042 2.58 2.58 67 0 0 92 1.53 0.4
18 0 0 43 2.79 2.54 68 2.37 2.38 93 0.67 2.33
19 0 0 44 2.88 2.99 69 2.0 2.0 94 0.83 0
MOTOR DRIVE IC
(IC604, BA6209/KA3082/DBL2084N)
PIN NO. REC PB
1 0 0
20.55 0
30.9 0.88
46.0 6.0
50.01 0.01
60.01 0.01
713.47 13.4
813.48 13.4
90.91 0.91
10 0.5 0.51

4
H-FI IC (IC201, LA72637M)
20 1.53 1.5 45 3.0 3.0 70 1.66 1.49 95 0 0
21 5.1 5.0 46 2.58 2.53 71 0 0 96 2.4 2.4
22 1.0 1.0 47 2.38 2.38 72 2.1 2.17 97 0 0
23 1.33 1.3 48 0 0 73 4.0 4.0 98 0 0
24 2.36 1.4 49 1.78 1.79 74 2.0 1.9 99 3.2 0.12
25 3.0 3.0 50 0 0 75 5.1 5.1 100 3.88 2.37
PIN NO. REC PB PIN NO. REC PB PIN NO. REC PB PIN NO. REC PB
12.4 2.43 17 0.7 0.7 33 2.5 2.5 49 3.49 3.5
2 0 0 18 2.49 2.54 34 0.7 0.7 50 3.0 3.1
32.4 2.43 19 2.49 2.53 35 02.5 51 4.99 5.0
4 0 0 20 2.55 0.4 36 0 0 52 3.3 3.38
52.2 2.24 21 2.53 037 1.64 1.6 53 5.83 5.95
62.49 2.5 22 2.54 0.68 38 0 0 54 2.3 2.34
72.0 2.0 23 05.0 39 0 0 0 55 0 0
80.3 024 05.0 40 4.9 5.0 56 0 0
9 0 0 25 4.9 5.0 41 0 0 57 5.9 6.0
10 0 0 2 26 2.5 042 4.8 4.8 58 12.6 12.6
11 0 0 27 2.8 2.8 43 4.7 4.7 59 5.9 5.9
12 2.0 2.0 28 4.2 4.2 44 2.33 2.3 60 1.2 1.2
13 2.38 2.38 29 5.0 1.8 45 0 0 61 2.49 2.52
14 0 0 30 01.8 46 3.5 3.5 62 2.43 2.46
15 0 0 31 1.0 1.89 47 3.1 3.2 63 2.37 2.38
16 0 0 32 2.49 2.5 48 2.1 2.1 64 0.39 0.4
PIN NO. REC PB PIN NO. REC PB PIN NO. REC PB PIN NO. REC PB
VOLTAGE CHART

5
TMI (RF101, LGTMI-SLQ1-S)
PIN NO. REC PB PIN NO. REC PB PIN NO. REC PB PIN NO. REC PB
1 0 0 6 3.7 3.7 11 0 0 16 0 0
2 0 4.4 7 0 0 12 4.9 5.0 17 2.3 2.38
35.1 5.1 4 8 0 0 13 0 0 18 0.1 0.2
44.65 4.3 94.8 4.8 14 32.8 32.75 19 1.68 1.7
51.41 1.41 10 4.7 4.74 15 0 0 20 1.58 1.5
VOLTAGE CHART
RESET IC (IC602,BMR-0301G)
REGULATOR IC
(IC802, KA431AZ)
PIN NO. REC PB
15.1 5.1
200
35.0 5.0
PIN NO. REC PB
12.44 2.44
200
34.5 4.5

6
CIRCUIT DIAGRAM
1. POWER SUPPLY SCHEMATIC DIAGRAM

7
CIRCUIT DIAGRAM
2. SERVO/SYSCON/CEC CIRCUIT DIAGRAM(T-DECK)

8
CIRCUIT DIAGRAM
3. VIDEO / AUDIO SCHEMATIC DIAGRAM ( 4 HEAD )

9
CIRCUIT DIAGRAM
4. VIDEO / AUDIO SCHEMATIC DIAGRAM ( HI - FI )