Zenith XBV 443, Service Manual

Page: 10 / 108

3-1
SECTION 3
ELECTRICAL
CONTENTS
OVERALL WIRING DIAGRAM
.....................3-2
VCR PART
ELECTRICAL ADJUSTMENT
PROCEDURES
..................................................3-3
ELECTRICAL
TROUBLESHOOTING GUIDE
......................3-4
1. POWER(SMPS) CIRCUIT .............................3-4
2. SYSTEM/KEY CIRCUIT ................................3-7
3. SERVO CIRCUIT ...........................................3-8
4. OSD CIRCUIT..............................................3-10
5. Y/C CIRCUIT ................................................3-11
6. Hi-Fi CIRCUIT..............................................3-15
7. Tuner/IF CIRCUIT........................................3-18
BLOCK DIAGRAMS
......................................3-20
1. Power (SMPS) BLOCK DIAGRAM.............3-20
2. TU/IF BLOCK DIAGRAM ............................3-22
3. Y/C BLOCK DIAGRAM ...............................3-24
4. NORMAL AUDIO BLOCK DIAGRAM.........3-26
5. Hi-Fi BLOCK DIAGRAM .............................3-28
6. SYSTEM BLOCK DIAGRAM ......................3-30
CIRCUIT DIAGRAMS
....................................3-32
1. Power (SMPS) CIRCUIT DIAGRAM...........3-32
2. TU/IF CIRCUIT DIAGRAM ..........................3-34
3. A/V CIRCUIT DIAGRAM .............................3-36
4. Hi-Fi CIRCUIT DIAGRAM ...........................3-38
5. JACK CIRCUIT DIAGRAM..........................3-40
6. SYSTEM CIRCUIT DIAGRAM.....................3-42
7. KEY CIRCUIT DIAGRAM ............................3-44
• WAVEFORMS................................................3-46
• CIRCUIT VOLTAGE CHART.........................3-48
PRINTED CIRCUIT DIAGRAMS
................3-50
1. MAIN P.C.BOARD .......................................3-50
2. MAIN P.C.BOARD .......................................3-52
3. POWER P.C.BOARD ...................................3-54
DVD PART
ELECTRICAL TROUBLESHOOTING
GUIDE & WAVEFORMS
...............................3-56
1. System Clock X601 (27Mhz)......................3-56
2. Initializing between MPEG and SDRAM...3-56
3. Initializing between MPEG and Flash.......3-57
4. Reference Voltage 1 ...................................3-57
5. Reference Voltage 2 ...................................3-58
6. Checking the initial step of M/D Ass’y .....3-58
7. Checking the Video Signal ........................3-59
8. Checking the first step of servo (1)..........3-59
9. Checking the second step of servo (2)....3-60
10. Checking the output of Audio signal .....3-60
11. Checking the reset port ...........................3-61
12. Checking the focus & tracking servo ....3-61
13. Checking the track jump .........................3-62
14. The status of CD_LD and DVD_LD in
the PLAY MODE........................................3-62
15. The status Focus and spindle motor .....3-63
16. DATA STREAM..........................................3-63
17. Input Clock to IC202 ................................3-64
18. Tray Open and Close ...............................3-64
19. Focus Drive signal(FACT) .......................3-65
20. Signals for Front micom..........................3-65
21. FACT and FE for DVD9 (Dual disc).........3-66
22. System clock of MPEG IC .......................3-66
BLOCK DIAGRAMS
......................................3-67
1. DVD Overall Block Diagram ......................3-67
2. SERVO Block Diagram ..............................3-68
3. MPEG Block Diagram ................................3-69
4. AUDIO Block Diagram ...............................3-70
CIRCUIT DIAGRAMS
....................................3-71
1. RD SERVO CIRCUIT DIAGRAM ................3-71
2. SYSTEM CIRCUIT DIAGRAM.....................3-73
3. AUDIO CIRCUIT DIAGRAM ........................3-75
• CIRCUIT VOLTAGE CHART.........................3-77