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Only for training and service purposes
4. TROUBLE SHOOTING
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START
Replace U101 or Change the board
Voltage MICBIAS of U1 01
= 2.0V?
Check t he Sold er
condition of R 214 and
C222,C224
Re-solder or replace the Component
Yes
No
Yes
No
Microphone w ill work
properl y.
Check the sig nal lev el
at MICP.
Is it about 1. 2~1.5V?
Re-solder or replace the mi crophone
Yes
No
CHECKING FLOW