Philips CT6558 Tuning Up Procedure & Operational Manual page 20

PHILIPS
Tuning Up procedure & Operational Manual
No hand free function:
Check the soldering issue of component.
Check Audio PA 7200,whether CS,US CD.
Check Speaker, LCD FPC, otherwise change them.
Mic has no function:
Check the assembly of Mic. Avoid assembly issue.
Check the signal at contact point to the Mic.
If the signal is not correct check the part in the circuit.
Check the signal "MIC-BIAS". If it's not correct, change 7400.
Otherwise change MIC, U503 in turns.
Revision :
Date :2004-9-7
Page No. : Page 20 of 20
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