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TROUBLE SHOOTING
No Power or Power shuts off
immediately
NO
Amber LED ON?
YES
NO
"NAD M2" shown on VFD?
YES
+/-53VL&R to AMP
NO
board correct after PSUA
K703 Click?
YES
B
Check PSUA
NO
5VDS RIGHT?
YES
Check DSP Board
NO
3V3 RIGHT?
YES
Check Q104 Q401
Check D402
3V3 3V3C 2V5 1V2
NO
TO IC523 RIGHT?
YES
NO
SPICS SPIBC SPID
signal to IC523 correct?
YES
Check IC523
Check 108M MCLK
Check cables from Main PSU
module to AMP board
Check Fuse on Main PSU module
Change failed PSU module
Check cable from PSUA to DSP
board
Check PSUA FUSE701
Check IC700 IC701
Short circuit of 3V3?
YES
Check U110 U301 U302
Check U131 U118 U120
+7.5V -5V on AMP board right?
YES
Check IC502 IC503 IC504 IC505
Check IC507 IC508 IC509
Check cable from DSP to AMP
board
Check AMP board IC560 IC561
Check DSP board U128 U129
U351 U130
5
NO
Replace U106
Check cable from PSUB to AMP
board
NO
Check PSUB FUSE800
Check IC800 U802
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