PG-1210 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 1.5V : CP117
NO Check that R135, C137, C136 and R138 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 C142.C141 pins for wave form : CP118
NO Replace MIC
CP117
CP118
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PANTECH
