Zenith ABV341 Series Service Manual Download

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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 .......................................................3-13
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. TIMER CIRCUIT DIAGRAM(XBV343) ..................3-44
8. TIMER CIRCUIT DIAGRAM(XBV342) ..................3-46
• WAVEFORMS .........................................................3-48
• CIRCUIT VOLTAGE CHART ..................................3-50

PRINTED CIRCUIT DIAGRAMS

.........................3-52

1. MAIN P.C.BOARD .................................................3-52
2. KEY 1(LEFT) P.C.BOARD ....................................3-54
3. KEY 2(RIGHT) P.C.BOARD ..................................3-54
4. POWER P.C.BOARD ............................................3-56

DVD PART(NS MODEL)

ELECTRICAL TROUBLESHOOTING
GUIDE

...........................................................................3-58

1. µ-COM CIRCUIT....................................................3-58
2. MPEG CIRCUIT.....................................................3-61
3. RF/Servo CIRCUIT ...............................................3-62

BLOCK DIAGRAMS

................................................3-66

1. DVD OVERALL BLOCK DIAGRAM .....................3-66
2. RF/CD DSP/DVD DSP/DVD SERVO BLOCK

DIAGRAM..............................................................3-67

3. Audio BLOCK DIAGRAM.....................................3-68
4. MEMORY BLOCK DIAGRAM...............................3-69

CIRCUIT DIAGRAMS

..............................................3-70

1. DVD DSP CIRCUIT DIAGRAM .............................3-70

2. DRIVE & RF CIRCUIT DIAGRAM ........................3-72
3. MEMORY CIRCUIT DIAGRAM .............................3-74
4. INTERFACE CIRCUIT DIAGRAM.........................3-76
5. µ-COM/Expander CIRCUIT DIAGRAM ................3-78
6. Jack CIRCUIT DIAGRAM .....................................3-80
• WAVEFORMS .........................................................3-82
• CIRCUIT VOLTAGE CHART ..................................3-84

PRINTED CIRCUIT DIAGRAMS

.........................3-90

1. MAIN P.C.BOARD (TOP VIEW)............................3-90
2. MAIN P.C.BOARD (BOTTOM VIEW)....................3-92

DVD PART(MTK MODEL)

ELECTRICAL TROUBLESHOOTING
GUIDE & WAVEFORMS

........................................3-94

1. SYSTEM OPERATION FLOW ..............................3-94
2. TEST & DEBUG FLOW ........................................3-95

DETAILS AND WAVEFORMS ON
SYSTEM TEST AND DEBUGGING

.................3-101

1. SYSTEM 27MHZ CLOCK,

RESET, FLASH R/W SIGNAL ............................3-101

2. SDRAM CLOCK..................................................3-101
3. TRAY OPEN/CLOSE SIGNAL ............................3-102
4. SLED CONTROL RELATED SIGNAL

(NO DISC CONDITION) ......................................3-105

5. LENS CONTROL RELATED SIGNAL

(NO DISC CONDITION) ......................................3-105

6. LASER POWER CONTROL RELATED

SIGNAL(NO DISC CONDITION).........................3-106

7. DISC TYPE JUDGEMENT WAVEFORM ............3-106
8. FOCUS ON WAVEFORM....................................3-108
9. SPINDLE CONTROL WAVEFORM

(NO DISC CONDITION) ......................................3-109

10. TRACKING CONTROL RELATED

SIGNAL(SYSTEM CHECKING) ........................3-110

11. RF WAVEFORM.................................................3-111
12. MT1379 AUDIO OPTICAL AND COAXIAL

OUTPUT (ASPDIF)............................................3-111

13. MT1379 VIDEO OUTPUT WAVEFORM............3-112
14. AUDIO OUTPUT FROM AUDIO DAC...............3-113

BLOCK DIAGRAMS

..............................................3-115

1. OVERALL BLOCK DIAGRAM............................3-115
2. SERVO BLOCK DIAGRAM ................................3-116
3. MPEG & MEMORY BLOCK DIAGRAM..............3-117
4. VIDEO & AUDIO BLOCK DIAGRAM .................3-118

CIRCUIT DIAGRAMS

........................................3-119

1. SYSTEM CIRCUIT DIAGRAM ............................3-119
2. RF & DSP SERVO CIRCUIT DIAGRAM ............3-121
3. AUDIO CIRCUIT DIAGRAM ...............................3-123
4. AV/JACK CIRCUIT DIAGRAM............................3-125
• CIRCUIT VOLTAGE CHART ................................3-127

PRINTED CIRCUIT DIAGRAMS

.......................3-131

1. MAIN P.C.BOARD ...............................................3-131