NAD T515AH Service Manual page 12

ELECTRICAL TROUBLESHOOTING GUIDE
1. POWER CHECK FLOW............................................................................................................3-2
2. SYSTEM OPERATION FLOW ..................................................................................................3-3
3. TEST & DEBUG FLOW ............................................................................................................3-4
4. Blank page..............................................................................................................................3-10
DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING
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 ................................................................................3-15
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. ZR36888 AUDIO OPTICAL AND COAXIAL OUTPUT(SPDIF) ............................................3-20
13. ZR36888 VIDEO OUTPUT WAVEFORM ..............................................................................3-21
14. AUDIO OUTPUT FROM AUDIO DAC ..................................................................................3-22
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
CIRCUIT DIAGRAMS
1. POWER(SMPS) CIRCUIT DIAGRAM.....................................................................................3-29
2. SYSTEM(MAIN) CIRCUIT DIAGRAM.....................................................................................3-31
3. SERVO CIRCUIT DIAGRAM ..................................................................................................3-33
4. AV/JACKCIRCUIT DIAGRAM.................................................................................................3-35
5. MEMORY CARD CIRCUIT DIAGRAM ...................................................................................3-37
6. TIMER CIRCUIT DIAGRAM....................................................................................................3-39
• CIRCUIT VOLTAGE CHART ....................................................................................................3-43
PRINTED CIRCUIT DIAGRAMS
1. MAIN P.C.BOARD ...................................................................................................................3-45
2. KEY P.C.BOARD.....................................................................................................................3-47
3. TIMER P.C.BOARD .................................................................................................................3-48
4. SMPS P.C.BOARD..................................................................................................................3-49
SECTION 3
ELECTRICAL
CONTENTS
..................................................................................................................3-24
................................................................................................................3-29
............................................................................................3-45
......................................................................3-2
3-1
....................3-11