NAD T534AH Service Manual page 10

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, 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
15. HDMI 480P ............................................................................................................................3-21
16. HDMI 720P ............................................................................................................................3-22
17. HDMI 1080I............................................................................................................................3-22
18. COMPONENT 720P Y...........................................................................................................3-23
19. COMPONENT 1080I Y ..........................................................................................................3-23
BLOCK DIAGRAMS
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. GENESIS & DVI Block Diagram............................................................................................3-29
CIRCUIT DIAGRAMS
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. VIDEO & HDMI Circuit DIAGRAM .........................................................................................3-42
• CIRCUIT VOLTAGE CHART ....................................................................................................3-44
PRINTED CIRCUIT DIAGRAMS
1. MAIN P.C.BOARD ...................................................................................................................3-46
2. KEY P.C.BOARD.....................................................................................................................3-48
3. TIMER P.C.BOARD .................................................................................................................3-49
4. SCART & 5.1CH P.C.BOARD(OPTIONAL PART) .................................................................3-50
5. SMPS P.C.BOARD ..................................................................................................................3-51
SECTION 3
ELECTRICAL
CONTENTS
..................................................................................................................3-24
................................................................................................................3-30
............................................................................................3-46
......................................................................3-2
3-1
....................3-10