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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) .............................................3-13
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. MT1389 AUDIO OPTICAL AND COAXIAL OUTPUT (SPDIF).............................................3-19
12. MT1389 VIDEO OUTPUT WAVEFORM................................................................................3-19
13. MT1389 AUDIO OUTPUT TO AUDIO DAC..........................................................................3-20
14. AUDIO OUTPUT FROM AUDIO DAC ..................................................................................3-21

BLOCK DIAGRAMS

..................................................................................................................3-22

1. Overall Block Diagram ..........................................................................................................3-22
2. Power(SMPS) Block Diagram ...............................................................................................3-23
3. SERVO Block Diagram ..........................................................................................................3-24
4. MPEG & MEMORY Block Diagram .......................................................................................3-25
5. VIDEO & AUDIO Block Diagram ...........................................................................................3-26

CIRCUIT DIAGRAMS

................................................................................................................3-27

1. Power(SMPS) Circuit DIAGRAM...........................................................................................3-27
2. AV/JACK Circuit DIAGRAM...................................................................................................3-29
3. SYSTEM Circuit DIAGRAM ...................................................................................................3-31
4. DRIVER Circuit DIAGRAM.....................................................................................................3-33
5. TIMER Circuit DIAGRAM .......................................................................................................3-35
6. 5.1CH & KARAOKE(KARAOKE MODEL ONLY) Circuit DIAGRAM ...................................3-37
7. SCART Circuit DIAGRAM .....................................................................................................3-39
• CIRCUIT VOLTAGE CHART ....................................................................................................3-41

PRINTED CIRCUIT DIAGRAMS

............................................................................................3-43

1. MAIN P.C.BOARD ...................................................................................................................3-43
2. KEY P.C.BOARD.....................................................................................................................3-45
3. TIMER P.C.BOARD .................................................................................................................3-46
4. SMPS P.C.BOARD ..................................................................................................................3-47