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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
DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING ....................3-10
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 ..................................................................................................................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
CIRCUIT DIAGRAMS................................................................................................................3-29
1. Power(SMPS) Circuit DIAGRAM...........................................................................................3-29
2. SYSTEM Circuit DIAGRAM ...................................................................................................3-31
3. RF & SERVO Circuit DIAGRAM............................................................................................3-33
4. TIMER, 5.1CH, SCART, KARAOKE Circuit DIAGRAM ........................................................3-35
5. AV/JACK Circuit DIAGRAM...................................................................................................3-37
• CIRCUIT VOLTAGE CHART ....................................................................................................3-39
PRINTED CIRCUIT DIAGRAMS ............................................................................................3-43
1. MAIN P.C.BOARD...................................................................................................................3-43
2. KEY P.C.BOARD.....................................................................................................................3-45
3. TIMER P.C.BOARD.................................................................................................................3-45
4. SMPS P.C.BOARD..................................................................................................................3-47
5. 5.1CH P.C.BOARD..................................................................................................................3-48