PM790 Radio Maintenance Manual
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41
6.8.5 Remote Speaker Microphone Failure
Remote Speaker
Microphone failure
Is it normal after
replacing remote
speaker microph
one?
Yes
End
No
Replace the
main PCB
Does the problem occur
when plugging remote
speaker microphone?
Yes
No
Check
whether the
FPC is normal
6.9No Voice Failure
No Voice
Failure
Is the voice normal
after replacing remote
speaker microph
one?
Yes
End
No
Replace the
main PCB
Is the current
normal when
pushing PTT?
No
Yes
Check whether
the CPS
frequency is
correct
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