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Audio Trouble
NG
Repair external
audio equipment
1、 Check peripheral power
supply
2、check the power supply
—— 1. no sound
Check if audio signal
Input is normal
NG
Set it rightly
NG
NG
Check AMP_MUTE
voltage(3.3V)
Change software or
change MSD6488MVE
OK
Check if the volume is rightly set or if
mute function is off
OK
Check if the output signal on the pin
1 & pin4 of CNA6 is normal
NG
Check pin2,3, 34,35,40,41,44,45of UA1/
TPA5707PHPR for the power supply(24V)
OK
Check the voltage (3.3V) on pin19of
UA1
OK
Check the signal output from pin
21& pin 22 of MSD6488MVE
OK
Repair the circuit between
MSD6488MVE and UA1
OK
Repair the
speaker
NG
Check if the audio signal
input to MSD6488MVE is
Ok
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