Table of Contents
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Checking Flow
SETTING : After initialize 5515C, Test US Cellular
START
No
No
Voltage at R371 = 1.2V?
Check the soldering
Re-solder R371
(MIC BIAS Voltage Check)
Of R371
Yes
Yes
Replace U201(QSC6010)
Check the signal level
No
Replace the microphone
at + pin of MIC.
Is It a few tens mVAC?
Yes
No
Check the soldering of
Re-solder C327
C327
Yes
No
Does MIC work Properly?
Replace U201(QSC6010)
Yes
MIC will work properly
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