Zenith DVB413, Service Manual

Page: 10 / 75

3-1
SECTION 3
ELECTRICAL
CONTENTS
ELECTRICAL TROUBLESHOOTING GUIDE
......................................................................3-2
1. Power check flow.....................................................................................................................3-2
2. System operation flow ............................................................................................................3-3
3. Test & debug flow ....................................................................................................................3-4
4. KARAOKE Flow (KARAOKE MODEL ONLY) .......................................................................3-10
DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING
....................3-11
1. SYSTEM 27MHz CLOCK, RESET SIGNAL ...........................................................................3-11
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 ................................................................................3-16
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. M3355 AUDIO OPTICAL AND COAXIAL OUTPUT(ASPDIF) .............................................3-20
13.M3355 VIDEO OUTPUT WAVEFORM...................................................................................3-21
14. AUDIO OUTPUT FROM AUDIO DAC ..................................................................................3-22
BLOCK DIAGRAMS
..................................................................................................................3-24
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
6. KARAOKE Block Diagram(KARAOKE MODEL ONLY) .......................................................3-29
CIRCUIT DIAGRAMS
................................................................................................................3-30
1. Power(SMPS) Circuit DIAGRAM...........................................................................................3-30
2. AV/JACK Circuit DIAGRAM...................................................................................................3-32
3. SYSTEM Circuit DIAGRAM ...................................................................................................3-34
4. DRIVER Circuit DIAGRAM.....................................................................................................3-36
5. TIMER Circuit DIAGRAM .......................................................................................................3-38
6. 5.1CH, SCART Circuit DIAGRAM .........................................................................................3-40
7. KARAOKE Circuit DIAGRAM(KARAOKE MODEL ONLY)...................................................3-42
• CIRCUIT VOLTAGE CHART ....................................................................................................3-44
PRINTED CIRCUIT DIAGRAMS
............................................................................................3-50
1. MAIN P.C.BOARD ...................................................................................................................3-50
2. KEY P.C.BOARD.....................................................................................................................3-52
3. TIMER P.C.BOARD .................................................................................................................3-53
4. SMPS P.C.BOARD ..................................................................................................................3-54