TROUBLESHOOTING B GUIDE
11
YES
Check IIS signal to U1002
C1V8 1V8 Correct?
YES
Check U1049 U1047 U1048 U1091
NO
NO
B
SPI to MCU
NO
12
MCLK correct?
&KHFN;
Check IIS buffer
Check U1057 U1058 U506
YES
Check U1002
Check Q1018 mute circuit
YES
Play 1Khz sinew ave track
YES
NO
DIGITAL output
correct?
YES
Check U1002
12
NO
Check U3030 U3034 U3033 U3038
Check IIS_sel signal
F in ish
Check U506
Check U600 U1030 U1035
Check K1001 K1002 K1003 K1004
Line Output correct?
Apply signal to coax or optical
Output correct?
Check output LPF circuit
< (6
+/-15V 3V3Z C3V3
Mute relay open
After 5-8S?
Correct?
Check U1043 U1044 U1045 U1041
Check U1038 U1039 U1040 U1042
Check K1005 K1006
Check D-Type Flip-Flop
Check U3042 U3048 U3036 U3037
Check U3040 U3043 U1032 U1052
Check U400
Check U1055
Summary of Contents for M12
Page 1: ...NAD SERVICE MANUAL DIGITAL PREAMP DAC DIGITAL PREAMP DAC...
Page 6: ...6 Wiring diagram...
Page 29: ...1 AUDIO BOARD 29 PCB LAYOUT Top Layer Bottom Layer...
Page 30: ...2 MDC BOARD 30 Top Layer Bottom Layer...
Page 31: ...31 3 MDC DIGTAL IO BOARD Bottom Layer Top Layer...
Page 32: ...32 4 232_TRIG BOARD Bottom Layer Top Layer...
Page 33: ...33 5 BOOTLOAD BOARD Bottom Layer Top Layer 6 ENCODER BOARD Bottom Layer Top Layer...
Page 34: ...34 7 TOUCH KEY BOARD Bottom Layer Top Layer 8 LED BOARD Bottom Layer Top Layer...
Page 35: ...35 9 FPP BOARD Bottom Layer Top Layer...
Page 36: ...36 10 USB XMOS BOARD Bottom Layer Top Layer...
Page 37: ...37 11 PSU BOARD Top Layer Bottom Layer...
Page 38: ...38 12 ANA BOARD Top Layer Bottom Layer...
Page 39: ...39 13 PHONO BOARD Top Layer Bottom Layer...
Page 40: ...4 14 HTRM2 BOARD Top Layer Bottom Layer...
Page 68: ...68...
Page 70: ...70...