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Zenith XBS448 Service Manual Page 41
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Table of contents
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3-42
3-43
7.
KEY
CIRCUIT
DIAGRAM
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
ST
1
2
...
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...
123
124
CONTENTS
1
SECTION 1
2
A.C. Voltmeter
3
SERVICING PRECAUTIONS
4
SECTION 2
5
CABINET & MAIN CHASSIS
5
5. Packing Accessory Section
10
SECTION 3
11
ELECTRICAL
11
OVERALL WIRING DIAGRAM
12
VCR PART
13
1. Power(SMPS) CIRCUIT
14
2. SYSTEM/KEY CIRCUIT
16
(1) AUTO STOP
16
Caution :
16
3. SERVO CIRCUIT
17
(1) Unstable Video in PB MODE
17
(2) When the Drum Motor
17
(2) doesn’t run
17
2. SERVO CIRCUIT
18
5. Y/C CIRCUIT
20
(1) No Video in EE Mode
20
3. Y/C CIRCUIT
21
6. Tuner/IF CIRCUIT
24
(2) No Sound
25
7. Hi-Fi Circuit
26
BLOCK DIAGRAMS
29
3. Y/C BLOCK DIAGRAM
31
4. NORMAL AUDIO BLOCK DIAGRAM
32
5. Hi-Fi BLOCK DIAGRAM
33
LA72670M
33
6. SYSTEM BLOCK DIAGRAM
34
CIRCUIT DIAGRAMS
35
3-32 3-33
36
3-34 3-35
37
4. A/V CIRCUIT DIAGRAM
38
5. Hi-Fi CIRCUIT DIAGRAM
39
6. SYSTEM CIRCUIT DIAGRAM
40
7. KEY CIRCUIT DIAGRAM
41
• WAVEFORMS
42
• CIRCUIT VOLTAGE CHART
43
PRINTED CIRCUIT DIAGRAMS
44
LOCATION GUIDE
44
NOTES) Warning
45
3. KEY 1(LEFT) P.C.BOARD
46
4. KEY 2(RIGHT) P.C.BOARD
46
DVD & AMP PART
47
2. Test & debug flow
48
Check the laser power circuit
51
ACKL, ASDAT3)
53
2. SDRAM CLOCK
57
3. TRAY OPEN/CLOSE SIGNAL
57
1) Tray open/close waveform
57
2) Tray close waveform
58
3) Tray open waveform
58
8. FOCUS ON WAVEFORMS
62
11. RF WAVEFORM
65
1) Full colorbar signal(CVBS)
65
(IC507 PIN 26)
66
FIG 12-3
66
(IC507 PIN 21)
66
FIG 12-2
66
1) Audio L/R
67
2) Audio related Signal
67
1. Overall Block Diagram
69
2. SERVO Block Diagram
70
IIC501 (MPEG + DSP )
71
MT1379EEC
71
INTERFACE
72
LH-C444M
73
3-83 3-84
76
LC875747B
77
3-85 3-86
77
3-87 3-88
78
3-89 3-90
79
3-91 3-92
80
• Top View
86
• Bottom View
86
(Figure A-1)
87
Fig. A-1
87
Fig. A-2
88
Gear Rack F/L
89
Gear Drive
89
Fig. A-4
91
Fig. A-5
92
17. Opener Lid (Fig. A-5-2)
92
19. Arm T/up (Fig. A-5-4)
92
Fig. A-9
96
34. Base Tension (Fig. A-9-1)
96
DECK MECHANISM ADJUSTMENT
100
2. Essential Check and Repair
105
3. Regular Check and Repair
105
4. Tools for Check and Repair
105
5. Maintenance Process
105
Cam Part
106
(KG-684G , GREEN)
106
EXPLODED VIEWS
113
DECK MECHANISM PARTS LOCATION
118
DECK MECHANISM DISASSEMBLY
119
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