NAD M15 C/AH - Electrical Diagrams and Troubleshooting

SECTION 3
ELECTRICAL CONTENTS
ELECTRICAL TROUBLESHOOTING GUIDE……………………………….3-2
1. Power check flow……………………………………………………………………….3-2,3
DETAILS AND WAVERORMS ON SYSTEM TEST AND DEBUGGING….3-4
1.DSP clock 20MHz;Volume control STB, DATA and CLOCK…………………………3-4
2.AT89C51 reset is high active;WM8740 DAC STB,DATA and CLOCK……………...3-5
BLOCK DIAGRAMS…………………………………………………………….
3-6
1. Digital section…………………………………………………………………………...3-6
2. Analog input section……………………………………………………………………3-7
3. Volume and EXT.section/L/R/C/SW…………………………………………………..3-8
4. Volume and EXT.section/SL/SR/SBL/SBR…………………………………………..3-9
5. Component video………………………………………………………………………3-10
6. S video section…………………………………………………………………………3-11
7. Composite video……………………………………………………………………….3-12
WIRING DIAGRAM…………………………………………………………….3-13
1.Wiring diagram……………………………………………………………….3-13
CIRCUIT DIAGRAMS…………………………………………………………3-14
1. Power supply circuit diagram………………………………………………………..3-14
2. Front panel circuit diagram…………………………………………………………..3-15
3. HDMI circuit diagram…………………………………………………………………3-16
4. CSS circuit diagram…………………………………………………………………..3-17
5. Audio circuit diagram…………………………………………………………………3-18,19,20
6. Video circuit diagram…………………………………………………………………3-21,22,23
PRINTED CIRCUIT DIAGRAM…………………………………………………….3-24
1. PSU board…………………………………………………………………………….3-24
2. FPP board……………………………………………………………………………..3-25
3. HDMI board……………………………………………………………………………3-26
4. CSS board……………………………………………………………………………..3-27
5. Audio board……………………………………………………………………………3-28
6. Video board……………………………………………………………………………3-29
3-1