Service manual

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..........................................3-6
3. SERVO CIRCUIT ....................................................3-7
4. OSD CIRCUIT .........................................................3-9
5. Y/C CIRCUIT.........................................................3-10
6. TUNER/IF CIRCUIT ..............................................3-14
7. Hi-Fi CIRCUIT.......................................................3-16
BLOCK DIAGRAMS ...............................................3-18
1. POWER(SMPS) BLOCK DIAGRAM 1 .................3-18
2. POWER(SMPS) BLOCK DIAGRAM 2 .................3-20
3. Y/C BLOCK DIAGRAM ........................................3-22
4. NORMAL AUDIO BLOCK DIAGRAM ..................3-24
5. Hi-Fi BLOCK DIAGRAM ......................................3-26
6. SYSTEM BLOCK DIAGRAM ...............................3-28
CIRCUIT DIAGRAMS .............................................3-30
1. POWER(SMPS) CIRCUIT DIAGRAM 1 ...............3-30
2. POWER(SMPS) CIRCUIT DIAGRAM 2 ...............3-32
3. JACK/TUNER CIRCUIT DIAGRAM .....................3-34
4. A/V CIRCUIT DIAGRAM.......................................3-36
5. Hi-Fi, DIGEST CIRCUIT DIAGRAM .....................3-38
6. SYSTEM CIRCUIT DIAGRAM..............................3-40
7. KEY CIRCUIT DIAGRAM .....................................3-42
• WAVEFORMS.........................................................3-44
• CIRCUIT VOLTAGE CHART ..................................3-46
PRINTED CIRCUIT DIAGRAMS ........................3-48
1. MAIN P.C.BOARD ................................................3-48
2. POWER P.C.BOARD ............................................3-50
3. KEY 1(LEFT) P.C.BOARD....................................3-52
4. KEY 2(RIGHT) P.C.BOARD..................................3-52
DVD & AMP PART
ELECTRICAL TROUBLESHOOTING
GUIDE
..........................................................................3-54
1. SYSTEM OPERATION FLOW..............................3-54
2. TEST & DEBUG FLOW........................................3-55
3. AUDIO µ-COM CIRCUIT(DVD & AMP)................3-63
DETAILS AND WAVEFORMS ON
SYSTEM TEST AND DEBUGGING
..................3-62
1. SYSTEM 27MHZ CLOCK,
RESET, FLASH R/W SIGNAL ..............................3-62
2. SDRAM CLOCK ...................................................3-64
3. TRAY OPEN/CLOSE SIGNAL..............................3-64
4. SLED CONTROL RELATED SIGNAL
(NO DISC CONDITION)........................................3-66
5. LENS CONTROL RELATED SIGNAL
(NO DISC CONDITION)........................................3-66
6. LASER POWER CONTROL RELATED
SIGNAL(NO DISC CONDITION) ..........................3-67
7. DISC TYPE JUDGEMENT WAVEFORMS ...........3-67
8. FOCUS ON WAVEFORMS ...................................3-69
9. SPINDLE CONTROL WAVEFORMS
(NO DISC CONDITION)........................................3-70
10. TRACKING CONTROL RELATED
SIGNAL(SYSTEM CHECKING) .........................3-71
11. RF WAVEFORM..................................................3-72
12. MT1379 VIDEO OUTPUT WAVEFORMS...........3-72
13. AUDIO OUTPUT FROM AUDIO DAC................3-74
14. DVD & AMP WAVEFORMS................................3-75
BLOCK DIAGRAMS ...............................................3-76
1. OVERALL BLOCK DIAGRAM .............................3-76
2. SERVO BLOCK DIAGRAM..................................3-77
3. MPEG & MEMORY BLOCK DIAGRAM...............3-78
4. VIDEO & AUDIO BLOCK DIAGRAM...................3-79
5. DVD & AMP BLOCK DIAGRAM ..........................3-80
CIRCUIT DIAGRAMS .............................................3-81
1. MPEG CIRCUIT DIAGRAM..................................3-81
2. RF & SERVO CIRCUIT DIAGRAM ......................3-83
3. AUDIO, µ-COM
CIRCUIT DIAGRAM(DVD & AMP) .......................3-85
4. DIGITAL AMP CIRCUIT
DIAGRAM (DVD & AMP)......................................3-87
5. PWM & CODEIC
CIRCUIT DIAGRAM (DVD & AMP)......................3-89
6. INTERFACE
CIRCUIT DIAGRAM (DVD & AMP)......................3-91
• CIRCUIT VOLTAGE CHART ..................................3-93
PRINTED CIRCUIT DIAGRAMS ........................3-97
1. DVD & AMP P.C.BOARD .....................................3-97