NAD M4 Service Manual page 15

A
Press band key to select DAB(or XM)
mode, input DAB (XM) test signal
1K 500mV(0dBFS) sinewave at antenna
side,check output
DAB:Level=500mV±50mV
THD<0.03%?
XM: Level=2V±0.1V
THD<0.03%?
YES
Press band key to select AM
mode, input AM test signal
1K 500mV sinewave at antenna
side,check output
Level=500mV±50mV
THD<5%?
YES
THE END
Check U104 input IIs signal
NO
Check U105 U106 U107 U108
check DB1 module
NO
Check conection between C425 and main
board
Check RL101 RL102 R184 R185
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