Zenith XBS344 Series, Service Manual

Page: 13 / 159

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. JACK & TUNER BLOCK DIAGRAM ...................3-22
4. Y/C BLOCK DIAGRAM ........................................3-24
5. NORMAL AUDIO BLOCK DIAGRAM ..................3-26
6. Hi-Fi BLOCK DIAGRAM ......................................3-28
8. SYSTEM BLOCK DIAGRAM ...............................3-30
CIRCUIT DIAGRAMS
.............................................3-32
1. POWER(SMPS) CIRCUIT DIAGRAM 1 ...............3-32
2. POWER(SMPS) CIRCUIT DIAGRAM 2 ...............3-34
3. JACK/TUNER CIRCUIT DIAGRAM .....................3-36
4. A/V CIRCUIT DIAGRAM.......................................3-38
5. Hi-Fi, DIGEST 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. TUNER P.C.BOARD .............................................3-52
3. POWER P.C.BOARD ............................................3-53
4. KEY 1(LEFT) P.C.BOARD....................................3-54
5. KEY 2(RIGHT) P.C.BOARD..................................3-54
DVD & AMP PART
ELECTRICAL TROUBLESHOOTING
GUIDE
..........................................................................3-56
1. SYSTEM OPERATION FLOW..............................3-56
2. TEST & DEBUG FLOW........................................3-57
3. AUDIO µ-COM CIRCUIT(DVD & AMP) ................3-63
DETAILS AND WAVEFORMS ON
SYSTEM TEST AND DEBUGGING
..................3-64
1. SYSTEM 27MHZ CLOCK,
RESET, FLASH R/W SIGNAL ..............................3-64
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 WAVEFORMS ...........3-69
8. FOCUS ON WAVEFORMS ...................................3-71
9. SPINDLE CONTROL WAVEFORMS
(NO DISC CONDITION)........................................3-72
10. TRACKING CONTROL RELATED
SIGNAL(SYSTEM CHECKING) .........................3-73
11. RF WAVEFORM..................................................3-74
12. MT1379 VIDEO OUTPUT WAVEFORMS...........3-74
13. AUDIO OUTPUT FROM AUDIO DAC ................3-76
14. DVD & AMP WAVEFORMS................................3-77
BLOCK DIAGRAMS
...............................................3-78
1. OVERALL BLOCK DIAGRAM .............................3-78
2. SERVO BLOCK DIAGRAM..................................3-79
3. MPEG & MEMORY BLOCK DIAGRAM ...............3-80
4. VIDEO & AUDIO BLOCK DIAGRAM...................3-81
5. DVD & AMP BLOCK DIAGRAM ..........................3-82
CIRCUIT DIAGRAMS
.............................................3-83
1. MPEG CIRCUIT DIAGRAM ..................................3-83
2. RF & SERVO CIRCUIT DIAGRAM ......................3-85
3. AUDIO, µ_COM
CIRCUIT DIAGRAM(DVD & AMP) .......................3-87
4. DIGITAL AMP CIRCUIT
DIAGRAM (DVD & AMP)......................................3-79
5. PWM & CODEIC
CIRCUIT DIAGRAM (DVD & AMP)......................3-91
6. INTERFACE
CIRCUIT DIAGRAM (DVD & AMP)......................3-93
• CIRCUIT VOLTAGE CHART ..................................3-95
PRINTED CIRCUIT DIAGRAMS
........................3-99
1. DVD & AMP P.C.BOARD .....................................3-99