Zenith XBV613 - DVD/VCR Combination Service Manual page 12

VCR PART
ELECTRICAL ADJUSTMENT
PROCEDURES
.......................................................3-2
ELECTRICAL
TROUBLESHOOTING GUIDE
1. POWER(SMPS) CIRCUIT..................................3-3
2. SYSTEM/KEY CIRCUIT.....................................3-6
3. SERVO CIRCUIT ...............................................3-7
4. OSD CIRCUIT ....................................................3-9
5. Y/C CIRCUIT ....................................................3-10
6. HI-FI CIRCUIT ..................................................3-14
7. TUNER/IF CIRCUIT .........................................3-17
BLOCK DIAGRAMS
1. POWER(SMPS) BLOCK DIAGRAM ...............3-19
2. TU/IF BLOCK DIAGRAM ................................3-21
3. Y/C BLOCK DIAGRAM ...................................3-23
4. NORMAL AUDIO BLOCK DIAGRAM .............3-25
5. HI-FI BLOCK DIAGRAM .................................3-27
6. SYSTEM BLOCK DIAGRAM...........................3-29
CIRCUIT DIAGRAMS
1. POWER(SMPS) CIRCUIT DIAGRAM .............3-31
2. TU/IF CIRCUIT DIAGRAM...............................3-33
3. A/V CIRCUIT DIAGRAM..................................3-35
4. HI-FI CIRCUIT DIAGRAM................................3-37
5. JACK CIRCUIT DIAGRAM..............................3-39
6. SYSTEM CIRCUIT DIAGRAM.........................3-41
• WAVEFORMS ....................................................3-43
• CIRCUIT VOLTAGE CHART .............................3-45
PRINTED CIRCUIT DIAGRAMS
1. MAIN P.C.BOARD (TOP SIDE) .......................3-49
2. MAIN P.C.BOARD (BOTTOM SIDE) ..............3-51
3. POWER P.C.BOARD ......................................3-53
4. KEY P.C.BOARD .............................................3-55
SECTION 3
ELECTRICAL
CONTENTS
..........................3-3
..........................................3-19
........................................3-31
....................3-49
DVD PART
ELECTRICAL
TROUBLESHOOTING GUIDE
1. POWER CHECK FLOW ..................................3-57
2. SYSTEM OPERATION FLOW.........................3-58
3. TEST & DEBUG FLOW ...................................3-59
DETAILS AND WAVEFORMS ON SYSTEM
TEST AND DEBUGGING
1. SYSTEM 27MHZ CLOCK, RESET SIGNAL ...3-65
2. SDRAM CLOCK ..............................................3-66
3. TRAY OPEN/CLOSE SIGNAL.........................3-66
4. SLED CONTROL RELATED SIGNAL
(NO DISC CONDITION)...................................3-68
5. LENS CONTROL RELATED SIGNAL
(NO DISC CONDITION)...................................3-68
6. LASER POWER CONTROL RELATED
SIGNAL(NO DISC CONDITION) .....................3-69
7. DISC TYPE JUDGEMENT WAVEFORM.........3-69
8. FOCUS ON WAVEFORM ................................3-71
9. SPINDLE CONTROL WAVEFORM
(NO DISC CONDITION)...................................3-72
10. TRACKING CONTROL RELATED
SIGNAL(SYSTEM CHECKING).....................3-73
11. RF WAVEFORM .............................................3-74
12. ZR36882 AUDIO OPTICAL AND COAXIAL
OUTPUT(SPDIF)............................................3-74
13. ZR36882 VIDEO OUTPUT WAVEFORM.......3-75
14. AUDIO OUTPUT FROM AUDIO DAC ...........3-76
BLOCK DIAGRAMS
1. SYSTEM BLOCK DIAGRAM...........................3-78
2. SERVO BLOCK DIAGRAM.............................3-79
3. AUDIO & VIDEO IN/OUT
BLOCK DIAGRAM...........................................3-80
CIRCUIT DIAGRAMS
1. SYSTEM CIRCUIT DIAGRAM.........................3-81
2. SERVO CIRCUIT DIAGRAM ...........................3-83
3. AV/JACK CIRCUIT DIAGRAM ........................3-85
3-1 3-1
........................3-57
.......................................3-65
...........................................3-78
.........................................3-81