Samsung YP-R1 Service Manual page 31

Troubleshooting
4-1-7 If the MIC doesn't work properly
If the MIC doesn't work properly
Does the MIC look fine
when checking visually?
Is the bias voltage present?
(R704 - 1.5V)
Replace the board.
(Detailed inspection is required.)
4-16
Yes
1
Yes  See the waveform and
the image in Fig. 4-9.
No
No
Disassemble the main body and
Replace the MIC.
replace the MIC.
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