Sidetone Not Transmitted (Earpiece ); Sidetone Not Transmitted (Hands Free Mic ) - Pantech G510 Service Manual

G510 Service Manual
6.2.3 Side Tone Not transmitted ( Ear-piece )
Repeat 6-2-1 No receiving tone heard.( Ear-piece )
1.Check to see if Mic + pin is around 1.8V : CP126
NO Check that R104,C181 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.
2.Check U102 No. J10(C132) pins for wave form : CP127
NO Replace MIC
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 U102 No. H10(C130) pin is 2.5V : CP129
NO Check that R107, R108, C128 and C151 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 U102 No. H10(C130) pins for wave form : CP129
NO Replace Handsfree Mic.
CP127 CP129
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PANTECH R&D CONFIDENTIAL
CP126