Troubleshooting B Guide - NAD M12 Service Manual

B
NO
Mute relay open
After 5-8S?
YES
NO
Play 1Khz sinew ave track
Line Output correct?
YES
NO
DIGITAL output
correct?
YES
F in ish

TROUBLESHOOTING B GUIDE

+/-15V 3V3Z C3V3
C1V8 1V8 Correct?
YES
Check IIS signal to U1002
SPI to MCU Correct?
YES
Check U1002
Check Q1018 mute circuit
Check K1001 K1002 K1003 K1004
Check K1005 K1006
Check U600 U1030 U1035
Apply signal to coax or optical
Output correct?
Check U400
Check U3030 U3034 U3033 U3038
Check U3042 U3048 U3036 U3037
Check U3040 U3043 U1032 U1052
Check U1055
Check IIS_sel signal
Check U506
NO
Check U1049 U1047 U1048 U1091
Check U1043 U1044 U1045 U1041
Check U1038 U1039 U1040 U1042
NO
MCLK correct?
YES
Check IIS buffer
Check U1057 U1058 U506
Check D-Type Flip-Flop
Check U1002
Check output LPF circuit
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