Sharp GX30 Service Manual - Page 58
Voice transmission/recording is impossible., Phone Handset
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GX30 CONFIDENTIAL 2. Voice transmission/recording is impossible. Phone (Handset) Replace the microphone. Is the problem solved? NO Is 1.2 - 2.1 V applied to both ends of C101? YES YES The built-in microphone is defective or in a poor contact with the PWB. L101, L102, and C101 are defective. YES NO Is 1.2 - 2.1 V applied to TP119? NO Is 2.4 - 2.5 V applied to TP176? NO YES R125 is defective. Is 2.4 - 2.5 V applied to IC103 pin 76? NO YES R115 and C108 are defective. Is approx. 1.7 V applied to IC103 pin 80? YES Is 2.7 or more voltage applied to R192 (IC106 pin 89 side)? YES Replace C126 or C133. Is the problem solved? NO IC103 and IC106 are defective. IC103 is defective. NO Is approx. 1.7 V applied to IC103 pin 96? NO YES R263 and R130 are defective. IC103 is defective. NO R192 is defective. (Headset mode is set.) YES C126 or C133 is defective. 2 - 50
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