Audio Part ( Earpiece, Hands-Free Earphone, Microphone, Hands-Free Mic ); N Oreceiving Tone Heard (Earpiece ); N Oreceiving Tone Heard (Hands Free Earphone ) - Pantech G310 Service Manual

G310 Service Manual

6.2 Audio Part ( Earpiece, Hands-free Earphone, Microphone, Hands-free Mic )

6.2.1 No receiving tone heard ( Ear-piece )
1. Check to see if U102.F10, A9 and J8 (C118, C119, C120) is 2.55V_A : CP117
2. Check to see if U102.A7 (C124) is around 1.2V : CP118
Set to HP8922M to connect a call and then set to 1kHz.
3. Check U102.K8 and K7 (C147, C148) pins (Ear Signal) for waveform : CP119
NO Replace U102.
4. Check to see if U115.B4 (C231) pin is battery voltage : CP120
NO Replace U115.
5. Check U115.A3 and C3 (R130 and R173) pin for waveform : CP121
NO Replace U115.
6.2.2 No Receivng tone heard ( Hands-free Earphone )
1. Check to see if U102.F10, A9 and J8 (C118. C119. C120) is 2.55V_A: CP117
2. Check to see if U102.A7 (C124) is around 1.2V : CP118
3. Check to see if U101.B11 (V101) is around 0V: CP122
NO Check to see J106 : CP123
Set to HP8922M to connect a call and then set to 1kHz.
4. Check C133.1 pin for waveform : CP124
5. Check Hands-free Earphone
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