Sharp GX30 Service Manual - Page 60
No voice is heard from the earpiece., Phone Handset, Hands free kit monaural headset
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GX30 3. No voice is heard from the earpiece. CONFIDENTIAL Phone (Handset) Is the signal sent to the contact terminal of the earpiece? NO Is the signal sent to CN103 pins 17 and 18? NO Is the signal sent to vsGNDs at both ends of C132? NO Is 2.7 or more voltage applied to R192 (IC106 pin 89 side)? YES Is approx. 1.2 V applied to IC103 pins 59 and 63? YES IC103 or IC106 is defective. YES The built-in earpiece is defective, or in a poor contact with TP734 or TP735. YES The camera relay FPC, CN103, or CN701 is defective. Or the camera is in a poor contact with CN103 and CN701. YES L107, L108, C115, and C120 are defective. NO R192 is defective. (Headset mode is set.) NO IC103 is defective. Hands free kit (monaural headset) Replace the hands free kit. Is the signal sent? NO Is the signal sent to JK101 pin 3? NO Is the signal sent to TP121? NO Is the signal sent to the positive pole of C107? NO Is the signal sent to IC103 pin 60? NO Is the voltage 0 V on R192 (IC106 pin 89 side)? YES Is approx. 1.2 V applied to IC103 pin 60? YES IC103 or IC106 is defective. YES Hands free kit is defective. YES Jack JK101 is defective, or the jack plug is in a poor contact with hands free kit. YES L103 is defective. YES C107, C103, and V106 are defective. YES R124 is defective. NO Jack JK101 is defective, or the jack plug is in a poor contact with hands free kit. (Handset mode is set.) NO IC103 is defective. 2 - 52
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