Samsung SGH-D820 Service Manual page 58

Gsm telephone
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Flow Chart of Troubleshooting
7-6. Microphone Part (Sub)
Microphone does not work
Check the connection status
of Sub_MIC
Check MIC_BIAS
= ' H' ?
Check MIC_SEL2
Check the MIC
Yes
Yes
Yes
= 'H' ?
Yes
Yes
END
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No
Resolder the Sub_MIC
No
Resolder R500, R501, TA502, R505, R506
No
Check the related circuit
No
Replace the Sub_MIC
7-10

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