Zenith DVB611 Service Manual page 12

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 SIGNAL. ..........................................................................3-10
2. SDRAM CLOCK ......................................................................................................................3-12
3. TRAY OPEN/CLOSE SIGNAL ................................................................................................3-12
4. SLED CONTROL RELATED SIGNAL(NO DISC CONDITION) .............................................3-13
5. LENS CONTROL RELATED SIGNAL(NO DISC CONDITION) .............................................3-13
6. LASER POWER CONTROL RELATED SIGNAL(NO DISC CONDITION) ............................3-14
7. DISC TYPE JUDGEMENT WAVEFORM ................................................................................3-14
8. FOCUS ON WAVEFORM........................................................................................................3-16
9. SPINDLE CONTROL WAVEFORM(NO DISC CONDITION ...................................................3-17
10. TRACKING CONTROL RELATED SIGNAL(System checking).........................................3-18
11. RF WAVEFORM ....................................................................................................................3-19
12. ZR36882 AUDIO OPTICAL AND COAXIAL OUTPUT(SPDIF) ............................................3-19
13. ZR36882 VIDEO OUTPUT WAVEFORM ..............................................................................3-20
14. AUDIO OUTPUT FROM AUDIO DAC ..................................................................................3-21
BLOCK DIAGRAMS
1. Overall Block Diagram ..........................................................................................................3-23
2. Power(SMPS) Block Diagram ...............................................................................................3-24
3. SERVO Block Diagram ..........................................................................................................3-25
4. MPEG & MEMORY Block Diagram .......................................................................................3-26
5. VIDEO & AUDIO Block Diagram ...........................................................................................3-27
CIRCUIT DIAGRAMS
1. POWER(SMPS) CIRCUIT DIAGRAM.....................................................................................3-28
2. SYSTEM CIRCUIT DIAGRAM ................................................................................................3-30
3. SERVO CIRCUIT DIAGRAM ..................................................................................................3-32
4. AV/JACKCIRCUIT DIAGRAM.................................................................................................3-34
5. TIMER CIRCUIT DIAGRAM ( 3 TOOL ONLY) .......................................................................3-36
6. TIMER CIRCUIT DIAGRAM ( 4 TOOL ONLY) .......................................................................3-38
7. TIMER CIRCUIT DIAGRAM ( 6 TOOL ONLY) .......................................................................3-40
8. TIMER CIRCUIT DIAGRAM ( 7 TOOL ONLY) .......................................................................3-42
9. TIMER CIRCUIT DIAGRAM ( 8 TOOL ONLY) .......................................................................3-44
• CIRCUIT VOLTAGE CHART ....................................................................................................3-46
PRINTED CIRCUIT DIAGRAMS
1. MAIN P.C.BOARD ...................................................................................................................3-48
2. KEY P.C.BOARD.....................................................................................................................3-50
3. TIMER P.C.BOARD .................................................................................................................3-51
4. SMPS P.C.BOARD(360mm ONLY) ........................................................................................3-52
5. SMPS P.C.BOARD(430mm ONLY) ........................................................................................3-52
SECTION 3
ELECTRICAL
CONTENTS
..................................................................................................................3-23
................................................................................................................3-28
............................................................................................3-48
......................................................................3-2
3-1
....................3-10