Block Diagrams - NAD M3 Service Manual

BLOCK DIAGRAMS

1. POWER DISTRIBUTE DIAGRAM
AC INLET EMI FILTER
L CHANNEL
MAIN
TRANSFORMER
FUSE F902
AH: 5A 250V
C: 3.15A 350V
STANDBY RELAY FUSE F901
100mA 250V
POWER SWITCH FUSE F903
AH: 5A 250V
C: 3.15A 350V
R CHANNEL
MAIN
TRANSFORMER
3-9
L CHANNEL
INPUT RELAYS
ON PREAMP
L CHANNEL
OUTPUT RELAYS
ON L AMP
±20V RECTIFY
±20V REGULATOR
B605 B606
ON PSU
ON PSU
±72V RECTIFY ±72V REGULATOR
B606 B606
ON PSU ON PSU
HIGH CURRENT
POWER SUPPLY
ISC CIRCUIT
RECTIFY
D602 D603
B603 B604
ON PSU
ON PSU
5V REGULATOR
B901 IC1
R-CORE
STANDBY
TRANSFORMER
12V RECTIFY
B902
HIGH CURRENT
POWER SUPPLY
ISC CIRCUIT
RECTIFY
D602 D603
B603 B604
ON PSU
ON PSU
±72V RECTIFY ±72V REGULATOR
B606 B606
ON PSU ON PSU
±20V RECTIFY
±20V REGULATOR
B605 B606
ON PSU
ON PSU
L CHANNEL
INPUT RELAYS
ON PREAMP
L CHANNEL
OUTPUT RELAYS
ON L AMP
BALANCE AMP
ON BAL
PRE AMP
ON PRE AMP
L CHANNEL
AMPLIFIER
ON L AMP
LOGIC CIRCUIT
ON PREAMP
MCU
LOGIC CIRCUIT
ON FPP
12V TRIGGER
ON BAL
STANDBY
RELAY
ON PSU
L CHANNEL
AMPLIFIER
ON L AMP
BALANCE AMP
ON BAL
PRE AMP
ON PRE AMP