NAD T 751 Service Manual page 12

ELECTRICAL TROUBLESHOOTING GUIDE
1. Power(SMPS) Circuit...............................................................................................................3-2
2. µ-com Circuit............................................................................................................................3-3
3. MPEG Circuit............................................................................................................................3-6
4. Front Circuit(Digitron & Key) ................................................................................................3-7
5. RF/Servo Circuit ......................................................................................................................3-8
BLOCK DIAGRAMS
1. Overall Block Diagram ..........................................................................................................3-12
2. Power (SMPS) Block Diagram..............................................................................................3-13
3. RF/CD DSP/DVD DSP/DVD servo Block Diagram ..............................................................3-14
4. Audio Block Diagram ............................................................................................................3-15
5. MPEG Block Diagram...........................................................................................................3-16
CIRCUIT DIAGRAMS
1. Power (SMPS) Circuit Diagram ............................................................................................3-17
2. DVD DSP Circuit Diagram .....................................................................................................3-19
3. Drive & RF Circuit Diagram ..................................................................................................3-21
4. MPEG Circuit Diagram ..........................................................................................................3-23
• WAVEFORMS ...........................................................................................................................3-25
5. Audio DM & 5.1CH Circuit Diagram .....................................................................................3-27
6. TIMER & Key Circuit Diagram ..............................................................................................3-29
7. A/V Circuit Diagram ...............................................................................................................3-31
8. A/V Jack Circuit Diagram ......................................................................................................3-33
9. SCART Circuit Diagram.........................................................................................................3-35
• CIRCUIT VOLTAGE CHART .........................................................................................................3-37
PRINTED CIRCUIT DIAGRAMS
1. MAIN P.C.BOARD ...................................................................................................................3-41
2. AV JACK P.C.BOARD.............................................................................................................3-43
3. SMPS P.C.BOARD ..................................................................................................................3-44
4. FRONT P.C.BOARD................................................................................................................3-43
SECTION 3
ELECTRICAL
CONTENTS
..................................................................................................................3-12
................................................................................................................3-17
............................................................................................3-41
......................................................................3-2
3-1