B
F i n i sh
Rear panel led show green?
YES
NO
led turn off?
Rear panel led show red?
NO
YES
Check D500 U505 circuit,
YES
Check Q500 Q502 Q508 circuit
Change NC400 OEM BOARD
Apply 1khz sinew ave to DUT
Amplifier output correct?
YES
NO
INC INH signal correct?
YES
Change NC400 OEM BOARD
check+/-14.5V,5V Right?
NO
checkQ505 Q506 Circuit
NO
change AMP board
YES
checkU500 U501 U502 U503 Circuit
change AMP board
checkQ503 Q504 Circuit
TROUBLESHOOTING B GUIDE
11
Summary of Contents for M22
Page 1: ...NAD SERVICE MANUAL M22 STEREO AMPLIFIER M22 STEREO AMPLIFIER...
Page 6: ...6...
Page 25: ...PCB LAYOUT 1 MCU VM1 0 BOARD Top Layer Bottom Layer 25...
Page 26: ...2 2 AMP VM1 0 BOARD Top Layer Bottom Layer...
Page 27: ...2 3 NC400 OEM VM1 0 BOARD Bottom Layer Top Layer...
Page 29: ...5 SMPS VM1 0 BOARD Bottom Layer Top Layer...
Page 30: ...3 6 SMPS STB VM1 0 BOARD Bottom Layer Top Layer...