Daewoo DV-K841DY User manual

Service Manual
S/M No. : VK811PSEF0
Jan. 2000
DAEWOO ELECTRONICS CO., LTD.
http : //svc.dwe.co.kr
Video Cassette Recorder
Model: DV-K841DY (VQ837)
F2GHA0
A

2
ELECTRICAL ADJUSTMENT
1. PLAYBACK PHASE
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)
ITEM MODE ADJUSTMENT
POINT CHECK POINT TEST EQUIPMENT TEST TAPE INPUT SIGNAL
6.5H
ADJUSTMENT PLAY [REC] BUTTON PIN 4 & PIN 5 OF P504 OSCILLOSCOPE DP-2 NO SIGNAL
ADJUSTMENT PARTS MEASURING POINT
PCB : MAIN - TOP VIEW
TMI
BLOC PRE-
AMP
P50
TO PATH JIG
OSCILLOSCOPE
CH1 CH2
PATH JIG

3
SPECIFICATIONS
CHANNEL COVERAGE
INPUT/OUTPUT JACK TYPE
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 cas-
sette
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
VIDEO
Signal system
Recording system
Input
Output
Signal-to-Noiseratio
Horizontal resolution
PAL/SECAM colour and CCIR monochrome signals, 625 lines/50 fields
Rotarytwo-head helical scanwithaslant double-azimuth combinationvideo
head
1.0Vp-p, 75ohms, unbalanced
1.0Vp-p, 75ohms, unbalanced
45dB (Rhode &Schwarz noisemeter) with NETTETEIMAGE control at cen-
ter position
240 lines with NETTETE IMAGE control at center position
AUDIO
Recording system
Input
Output
Frequency Range
Signal to Noise Ratio
Audio Distortion
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)
TUNER
Tuningsystem
RF Output Voltage synthesized tuner Programmable V/S 99CH (Hyper band) UHF channel 21~69 (52)
TIMER
Memory programmable
Back up time
Clock exactness
99 CH
Less than 1 Hour
In accordance with the exactness of power supply frequency (50Hz)
ACCESSORIES
ProvidedAccessories Remote control unit, RF Cable, Battery
SYSTEM
SECAM-L
PAL, SECAM-B/G, PAL-I/I
PAL, SECAM-B/G, D/K, HYPER BAND PAL-I
CHANNEL
VHFCh 2~12
UHF Ch 21~69
CATV Ch X,Y,Z S1~S41 UHF Ch 21~69
Model EUROPE Asia, South Africa, Australia
Jack Type SCART Type RCA Jack (Phone Jack)
* Design and specification can be subjected to change without notice.

4
VOLTAGE CHART
PDC/VPS IC
(IC151, LC74793)
PIN NO. REC PB
100
22.64 2.68
32.68 2.72
400
500
63.7 3.7
73.9 3.9
84.98 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
100
200
300
400
53.9 3.9
63.9 4
700
85.24 5.29
MOTOR DRIVE IC
(IC502, KA3082)
PIN NO. REC PB
100
20.55 0.55
38.78 0.88
46.24 6.24
50.01 0.01
60.01 0.01
712.12 11.74
812.12 11.74
90.91 0.91
10 0.55 0.55
SECAM.L IC
(IC361, TA1238N)
PIN NO. REC PB
12.48 2.49
22.72 2.4
32.97 2.96
44.1 4.12
55.05 5.06
64.68 4.69
74.75 4.74
800
90.56 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

5
VOLTAGE CHART
A/V ICHIP IC (IC301, LA71594M)
A/V SW IC (IC601, LA7148M)
PIN NO. REC PB PIN NO. REC PB PIN NO. REC PB PIN NO. REC PB
12.5 2.5 26 0 -51 1.9 1.9 76 2.5 2.5
22.5 2.5 27 - - 52 2.4 2.4 77 -0
32.5 2.5 28 - - 53 0 0 78 2.5 2.5
42.5 2.5 29 0.8 0.8 54 2.4 2.4 79 2.5 2.5
52.5 2.5 30 0 1.0 55 5.0 5.0 80 2.5 2.5
62.5 2.5 31 2.1 2.1 56 0.5 0.5 81 0 0
72.5 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
PIN NO. REC PB PIN NO. REC PB PIN NO. REC PB PIN NO. REC PB
15.89 5.89 10 5.47 5.47 19 2.14 2.06 28 0.09 0.09
20.37 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
40.08 0.08 13 0 0 22 1.49 1.07 31 5.26 5.26
55.89 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
89.36 9.36 17 5.05 5.05 26 4 4 35 5.25 5.25
95.89 5.89 18 1.73 1.73 27 0.09 0.09 36 5.89 5.89

6
VOLTAGE CHART
HI-FI IC (IC251, TDA9605H)
PIN NO. REC PB PIN NO. REC PB PIN NO. REC PB PIN NO. REC PB
1 0 0 12 0 0.03 23 3.85 3.81 34 9.42 9.36
23.81 3.81 13 3.83 3.83 24 3.86 3.77 35 4.21 0.53
33.81 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
63.81 3.81 17 4.55 4.56 28 3.82 3.82 39 0 0
73.81 3.81 18 3.31 3.29 29 3.85 3.82 40 5.05 5.09
83.81 3.81 19 4.56 4.56 30 0.72 0.7 41 0.93 0.94
93.81 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. EE PIN NO. EE
10.03 27 0
22.29 28 0
30.01 29 0
40.01 30 3.69
5 0 31 3.7
64.95 32 0
73.95 33 8.25
83.7 34 6.57
9 0 35 0
10 0 36 3.66
11 037 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
A2 IC (MSP3407DQ)
PIN NO. EE PIN NO. EE
10.01 27 0
2 0 28 0
30.01 29 0
40.01 30 3.72
5 0 31 3.73
65.02 32 0
73.6 33 8.15
83.3 34 6.47
92.47 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

7
VOLTAGE CHART
TMI (RF101, LGTMI-SLQ1-S)
PIN NO. REC PB PIN NO. REC PB PIN NO. REC PB PIN NO. REC PB
14.83 4.9 731.9 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
33.7 3.7 9 0 0 15 0 0 21 2.43 0
44.85 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
24 1.66 50 0
25 1.69 51 2.32
26 0 52 2.26
PIN NO. EE PIN NO. EE
24 1.69 50 0
25 1.7 51 2.35
26 0 52 2.27
PIN NO. EE PIN NO. EE
REGULATOR IC
(IC802, KA431AZ)
PIN NO. REC PB
12.49 2.49
2 0 0
34.82 4.82

8
CIRCUIT DIAGRAM
1. POWER CIRCUIT DIAGRAM (230V ONLY)

9
2. SYSCON CIRCUIT DIAGRAM

10
3. A/V CIRCUIT DIAGRAM (PAL)

11
CIRCUIT DIAGRAM
5. PIF CIRCUIT DIAGRAM

12
CIRCUIT DIAGRAM
6. HIFI & SW CIRCUIT DIAGRAM

13
CIRCUIT DIAGRAM
7. SW CIRCUIT DIAGRAM

14
DISASSEMBLY
1. PACKING ASS’Y

28
DISASSEMBLY
DV-K841D (VQ837)
DV-K861D SERIES

16
DISASSEMBLY
3. INSTRUMENT DISASSEMBLY
3-1. TOP COVER REMOVAL ( FIG.1 )
1) Remove five (5) screws holding the top cover.
2) Carefully lift the back of the top cover and slide to the rear to remove.

17
DISASSEMBLY
3-2. FRONT PANEL REMOVAL ( FIG.2 )
1) Remove the top cover.
2) Release seven (7) tabs holding the front panel.
3) Remove the front panel.

18
DISASSEMBLY
3-3. BOTTOM COVER REMOVAL ( FIG.3 )
1) Remove the top cover and front panel.
2) Remove three (3) screws.
3) Release four (4) tabs and lift out the bottom cover.

19
DISASSEMBLY
3-4. F/L DOOR REMOVAL ( FIG.4 )
1) Open the F/L door 90 ° .
2) Remove the F/L door in the direction of arrow.

20
DISASSEMBLY
3-5. COVER PRE-AMP / DECK AS REMOVAL ( FIG.5 )
1) Remove five (5) screws.
2) Disconnect the connector and FPC.
3) Pull out the DECK AS and COVER PRE-AMP in the direction of arrow.