NAD T517AHT, Service Manual

Page: 14 / 78

3-1
SECTION 3
ELECTRICAL
CONTENTS
ELECTRICAL TROUBLESHOOTING GUIDE
.....................................................................................3-2
1. SMPS TROUBLESHOOTING FLOW ......................................................................................................3-2
2. POWER CHECK FLOW ..........................................................................................................................3-4
3. SYSTEM OPERATION FLOW.................................................................................................................3-5
4. SYSTEM TEST FLOW ...........................................................................................................................3-6
DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGIBG
...................................3-12
1. SYSTEM 27MHZ CLOCK, RESET, FLASH R/W SIGNAL ....................................................................3-12
2. SDRAM CLOCK ...................................................................................................................................3-14
3. TRAY OPEN/CLOSE SIGNAL ...............................................................................................................3-14
4. SLED CONTROL RELATED SIGNAL (NO DISC CONDITION)............................................................3-15
5. LENS CONTROL RELATED SIGNAL (NO DISC CONDITION) ..........................................................3-15
6. LASER POWER CONTROL RELATED SIGNAL (NO DISC CONDITION) ..........................................3-16
7. DISC TYPE JUDGEMENT WAVEFORM...............................................................................................3-16
8. FOCUS ON WAVEFORM ......................................................................................................................3-18
9. SPINDLE CONTROL WAVEFORM (NO DISC CONDITION) ...............................................................3-19
10. TRACKING CONTROL RELATED SIGNAL (SYSTEM CHECKING) ....................................................3-20
11. MT1389S AUDIO OPTICAL AND COAXIAL OUTPUT (SPDIF) ............................................................3-21
12. MT1389S VIDEO OUTPUT WAVEFORM .............................................................................................3-21
13. AUDIO OUTPUT FROM MT1389S........................................................................................................3-22
CONNECTOR PICTURE
..........................................................................................................................3-23
1. ALL CONNECTOR PICTURE ................................................................................................................3-23
2. MAIN BOARD CONNECTOR PICTURE ...............................................................................................3-24
3. CN201 CONNECTOR PICTURE...........................................................................................................3-25
4. CN202 CONNECTOR PICTURE...........................................................................................................3-25
5. CN601 CONNECTOR PICTURE...........................................................................................................3-26
6. CN602 CONNECTOR PICTURE...........................................................................................................3-26
7. CN604 CONNECTOR PICTURE...........................................................................................................3-27
8. CN605 CONNECTOR PICTURE...........................................................................................................3-27
9. CN705 CONNECTOR PICTURE...........................................................................................................3-28
BLOCK DIAGRAMS
..................................................................................................................................3-29
1. OVERALL BLOCK DIAGRAM ...............................................................................................................3-29
2. POWER (SMPS) BLOCK DIAGRAM.....................................................................................................3-30
3. MPEG & MEMORY BLOCK DIAGRAM.................................................................................................3-31
4. SERVO BLOCK DIAGRAM ...................................................................................................................3-32
5. VIDEO & HDMI BLOCK DIAGRAM .......................................................................................................3-33
6. AUDIO BLOCK DIAGRAM.....................................................................................................................3-34
CIRCUIT DIAGRAMS
................................................................................................................................3-35
1. POWER (SMPS) CIRCUIT DIAGRAM ..................................................................................................3-35
2. MPEG CIRCUIT DIAGRAM ...................................................................................................................3-37
3. SERVO CIRCUIT DIAGRAM .................................................................................................................3-39
4. JACK CIRCUIT DIAGRAM ....................................................................................................................3-41
5. SCART CIRCUIT DIAGRAM (OPTION) ................................................................................................3-43
6. USB CIRCUIT DIAGRAM ......................................................................................................................3-45
7. KEY CIRCUIT DIAGRAM ......................................................................................................................3-46
8. TIMER CIRCUIT DIAGRAM ..................................................................................................................3-47
• CIRCUIT VOLTAGE CHART
.........................................................................................................3-49
PRINTED CIRCUIT BOARD DIAGRAMS
...........................................................................................3-53
1. MAIN P.C.BOARD..................................................................................................................................3-53
2. POWER (SMPS) P.C.BOARD ...............................................................................................................3-55
3. KEY P.C.BOARD ...................................................................................................................................3-55
4. TIMER P.C.BOARD ...............................................................................................................................3-55
5. SCART P.C.BOARD (OPTION) .............................................................................................................3-57
6. USB P.C.BOARD ...................................................................................................................................3-57