Zenith ZDA311 - Slim Progressive Scan DVD Service Manual - Section 3

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. MT1389D AUDIO OPTICAL AND COAXIAL OUTPUT (SPDIF) ..........................................3-19

12. MT1389D VIDEO OUTPUT WAVEFORM .............................................................................3-19

13. AUDIO OUTPUT FROM AUDIO DAC ..................................................................................3-20

BLOCK DIAGRAMS

..................................................................................................................3-21

1. Overall Block Diagram ..........................................................................................................3-21

2. Power(SMPS) Block Diagram ...............................................................................................3-22

3. SERVO Block Diagram ..........................................................................................................3-23

4. MPEG & MEMORY Block Diagram .......................................................................................3-24

5. VIDEO & AUDIO Block Diagram ...........................................................................................3-25

CIRCUIT DIAGRAMS

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1. Power(SMPS) Circuit DIAGRAM...........................................................................................3-26

2. AV/JACK Circuit DIAGRAM...................................................................................................3-28

3. SYSTEM Circuit DIAGRAM ...................................................................................................3-30

4. DRIVER Circuit DIAGRAM.....................................................................................................3-32

5. TIMER Circuit DIAGRAM .......................................................................................................3-34

• CIRCUIT VOLTAGE CHART ....................................................................................................3-36

PRINTED CIRCUIT DIAGRAMS

............................................................................................3-38

1. MAIN P.C.BOARD ...................................................................................................................3-38

2. KEY P.C.BOARD.....................................................................................................................3-40

3. TIMER P.C.BOARD .................................................................................................................3-41

4. SMPS P.C.BOARD ..................................................................................................................3-42