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GB310 Service Manual
6.2.4 Side Tone Not transmitted ( Hands-free Mic. )
Repeat 6-2-2 No receiving tone heard.( Hands-free Earphone ).
1. Check to see if R144 pin is 2.5V : CP119
NO
Check that C148 is cold solder,broken,short to the other
PCB pattern or not.
If you find out any defective part, you replace it.
Set to HP8922M to connect a call and then set to 1kHz with Echo audio mode.
3. Check C148 pins for wave form : CP119
NO
Replace Handsfree Mic.
1
PANTECH
CP119
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