NAD M3 Service Manual page 15

ELECTRICALTROUBLESHOOTING GUIDE
1. Power check flow
2. Preamp operation flow
DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING
1. SYSTEM 11MHz CLOCK
2. AT89C51 reset signal
3. Volume control DATA and CLOCK
4. REC(ZONE) select DATA and CLOCK
5. Input select DATA and CLOCK
BLOCK DIAGRAMS
1. POWER DISTRIBUTE DIAGRAM
2. PREAMP SIGNAL PATH
3. SYSTEM CONTROL PATH
CIRCUIT DIAGRAMS
1. POWER AMPLIFIER BOARD Circuit DIAGRAM
2. PREAMP BOARD Circuit DIAGRAM
3. STANDBY AND SPEAKER BOARD Circuit DIAGRAM
4. ENCODER AND CONNECT BOARD Circuit DIAGRAM
5. FRONT PANEL BOARD Circuit DIAGRAM
6. BALANCE INPUT BOARD Circuit DIAGRAM
7. POWER BOARD Circuit DIAGRAM
PRINTED CIRCUIT DIAGRAMS
1. Preamp Main board(PREM)
2. Preamp LCH input board(PREL)
3. Preamp tone control board(PRET)
4. Power supply board(PSU)
5. Balance amplifier board(BAL)
6. Connect board(CON)
7. Encoder board(ENC)
8. Speaker board(SPK)
9. Front pannel board(FPP)
10. Standby board Bottom(STBB)
11. Standby board top(STBT)
12. Left Channel PCB
13. Right Channel PCB
14. Preamp Module
SECTION 3
ELECTRICAL CONTENTS
PCB
3-1
3-2
3-2,3
3-4,5
3-6
3-6
3-6
3-7
3-7
3-8
3-9
3-9
3-10
3-11
3-12
3-12
3-13
3-14
3-15
3-16
3-17
3-18
3-19
3-19
3-20
3-20
3-21
3-22
3-23
3-23
3-23
3-24
3-25
3-26
3-27
3-28
3-29