NAD T531B - SECTION 3 ELECTRICAL; Troubleshooting, Diagrams, and Schematics

3-1
SECTION 3
ELECTRICAL
CONTENTS
ELECTRICAL TROUBLESHOOTING GUIDE......................................................................3-2
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..................................................................................................................3-12
1. Overall Block Diagram ..........................................................................................................3-12
2. Power (SMPS) Block Diagram..............................................................................................3-14
3. RF/CD DSP/DVD DSP/DVD servo Block Diagram ..............................................................3-18
4. Audio Block Diagram ............................................................................................................3-19
5. MPEG Block Diagram............................................................................................................3-17
6. µ-COM Block Diagram...........................................................................................................3-18
CIRCUIT DIAGRAMS................................................................................................................3-19
1. Power (SMPS) Circuit Diagram ............................................................................................3-19
2. DVD DSP Circuit Diagram.....................................................................................................3-23
3. Drive & RF Circuit Diagram ..................................................................................................3-25
4. MPEG Circuit Diagram ..........................................................................................................3-27
5. Audio DM Circuit Diagram ....................................................................................................3-29
6. µ-COM/Expander....................................................................................................................3-31
7. DIGITRON & Key Circuit Diagram........................................................................................3-33
8. Scart Circuit Diagram............................................................................................................3-35
9. Jack Circuit Diagram.............................................................................................................3-37
• CIRCUIT VOLTAGE CHART ....................................................................................................3-39
• WAVEFORMS ...........................................................................................................................3-45
PRINTED CIRCUIT DIAGRAMS............................................................................................3-47
1. MAIN P.C.BOARD...................................................................................................................3-47
2. POWER, A/V, FRONT P.C.BOARD ........................................................................................3-49
3. KEY P.C.BOARD.....................................................................................................................3-51
4. POWER LED P.C.BOARD ......................................................................................................3-51