TROUBLESHOOTING A GUIDE
10
YES
Check Sw itching Mode
Check MDC Board
Pow er Supply RIGHT?
Change SMPS
< (6
NO
NO
Amber LED ON?
No Pow er or Pow er shuts off
immediately
3V3S RIGHT?
NO
NO
Short circuit of 3V3s?
Replace U3064
Check U3064 U3052 U3053 U3054
Change FPP board
< (6
Check U3058
Check FPP&LCD board
YES
SPI signal to FPP
YES
NO
YES
short circuit on 5V3F(5V3D)
YES
NO
5V3F(5V3D) correct?
YES
< (6
NO
correct?
Check U3065 U3066 U1038 U1039
Check U1041 U1042 U9001
Check Q1 U7
NO
NO
Check U3058
Display sample rate
B
Check J7003
Check U400 U401
Check Touch board and cable
Touch Pow er key
Connect USB cable to computer
Computer found hardw are
and M12 LCD
Check driver on computer
LCD Display ON?
U3055 U3056 U3057 U3059 U3060
Check U3071 U3060
Check U9002 U9003 U9004 U9006
3V3?
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...