Troubleshooting B Guide - NAD M22 Service Manual

B
NO
Rear panel led show green?
YES
Apply 1khz sinew ave to DUT
NO
Amplifier output correct?
YES
F i n i sh

TROUBLESHOOTING B GUIDE

NO
Rear panel led show red?
YES
Check Q500 Q502 Q508 circuit
Change NC400 OEM BOARD
NO
INC INH signal correct?
YES
Change NC400 OEM BOARD
led turn off?
YES
Check D500 U505 circuit,
check+/-14.5V,5V Right?
YES
checkU500 U501 U502 U503 Circuit
checkQ503 Q504 Circuit
change AMP board
11
checkQ505 Q506 Circuit
NO
change AMP board