Panasonic SA-MAX3500PU - Troubleshooting: No Sound (MIC)

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7.4. No Sound from MIC at any selector
Press Power Button of Unit
or Remote Control to Turn
ON the Unit
Change Mic cable/
Mic if found NG.
-Check Mic and
Mic cable.
NG
Check Supply
Voltage
IC1400/1
(pin9) >9V - OK
OK
No
signal
Yes
1
2
OK
NG
NG
OK
Monitor CN1401 pin 1
(MIC IN) signal. No
Signal when speaking -
> NG
Check if signal at
main pcb C1048 to
IC1001
No
Signal
Check SOC
IC1001
(Pin 84)
Change IC1400/1
if found short to
gnd.
Replace:
IC1400/1
Replace
C1048 on
Main PCB
Change
IC1001.
3
4
Select USB A selector, connect MIC1/
MIC2. Turn ON MIC and speak into MIC.
No Sound comes out from speaker.
End
Check CN1401(pin 2/3)
Mic Det status when MIC
inserted, 3.3V± OK
<2.0V - NG
Yes
No
signal
Yes
5
Replace MIC
Jacks
JK1401/
JK1403
6