Zenith DVB352 Series Service Manual page 11

ELECTRICAL TROUBLESHOOTING GUIDE
1. Power check flow.....................................................................................................................3-2
2. System operation flow ............................................................................................................3-3
3. Test & debug flow ....................................................................................................................3-4
DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING
1. SYSTEM 27MHz CLOCK,RESET,FLASH R/W SIGNAL .......................................................3-10
2. SDRAM CLOCK ......................................................................................................................3-12
3. TRAY OPEN/CLOSE SIGNAL ................................................................................................3-12
4. SLED CONTROL RELATED SIGNAL (NO DISC CONDITION) ............................................3-14
5. LENS CONTROL RELATED SIGNAL(NO DISC CONDITION) .............................................3-14
6. LASER POWER CONTROL RELATED SIGNAL(NO DISC CONDITION) ............................3-15
7. DISC TYPE JUDGEMENT WAVEFORM ................................................................................3-15
8. FOCUS ON WAVEFORM........................................................................................................3-17
9. SPINDLE CONTROL WAVEFORM (NO DISC CONDITION).................................................3-18
10. TRACKING CONTROL RELATED SIGNAL(System checking).........................................3-19
11. RF WAVEFORM ....................................................................................................................3-20
12. MT1379 AUDIO OPTICAL AND COAXIAL OUTPUT (ASPDIF)..........................................3-20
13. MT1379 VIDEO OUTPUT WAVEFORM................................................................................3-21
14. AUDIO OUTPUT FROM AUDIO DAC ..................................................................................3-22
BLOCK DIAGRAMS
1. Overall Block Diagram ..........................................................................................................3-24
2. Power(SMPS) Block Diagram ...............................................................................................3-25
3. SERVO Block Diagram ..........................................................................................................3-26
4. MPEG & MEMORY Block Diagram .......................................................................................3-27
5. VIDEO & AUDIO Block Diagram ...........................................................................................3-28
CIRCUIT DIAGRAMS
1. Power(SMPS) Circuit DIAGRAM...........................................................................................3-29
2. SYSTEM Circuit DIAGRAM ...................................................................................................3-31
3. RF & SERVO Circuit DIAGRAM ............................................................................................3-33
4. TIMER Circuit DIAGRAM .......................................................................................................3-35
5. 2CH, 5.1CH Circuit DIAGRAM...............................................................................................3-37
6. AV/JACK Circuit DIAGRAM...................................................................................................3-39
• CIRCUIT VOLTAGE CHART ....................................................................................................3-41
PRINTED CIRCUIT DIAGRAMS
1. MAIN P.C.BOARD(TOP SIDE)................................................................................................3-45
2. MAIN P.C.BOARD(BOTTOM SIDE)........................................................................................3-47
3. KEY P.C.BOARD.....................................................................................................................3-49
4. TIMER P.C.BOARD .................................................................................................................3-49
5. POWER P.C.BOARD...............................................................................................................3-51
SECTION 3
ELECTRICAL
CONTENTS
..................................................................................................................3-24
................................................................................................................3-29
............................................................................................3-45
......................................................................3-2
3-1
....................3-10