Sharp GX30 Service Manual - Page 63
Clock Settings are reset., 7. Speaker does not work., X101, R169, R174A, and C176 are defective.
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Page 63 highlights
6. Clock Settings are reset. CONFIDENTIAL GX30 Is 2.5 V or more applied to TP168 with a battery in the handset? YES Is 1.5 V or more applied to TP167 without a battery in the handset? YES X101, R169, R174A, and C176 are defective. The holder is installed improperly. NO NO Is back-up battery holder properly installed to SD/SIM FPC? YES • The remaining power of back-up battery is insufficient. • Back-up battery is defective. • Back-up battery holder is defective. • SD/SIM FPC is broken, or CN104 is defective. • R254 is defective. NO IC103 is defective. 7. Speaker does not work. * When ring tones sound, but keypad tones do not, "Keypad Tones" is set to Off. * When Ringer Volume is set to "Silent": · Voice Recorder playback sound is not produced. · Playback sound of Video and MP3 can be heard by increasing the volume during playback. Are speaker terminals in contact with the land? YES Is the impedance between speaker terminals approx. 8 ohms? NO Speaker is defective. NO Speaker is defective. YES Is the signal sent to TP701, TP702, or speaker contact pad? YES Speaker is defective. NO Is the signal sent to CN103 pins 3 and 4? NO Is VBAT voltage applied to IC105 pin 15? YES The camera relay FPC, CN103, or CN701 is defective. Or the camera is in a poor contact with CN103 and CN701. NO R139 is defective. YES Is approx. 3 V applied to IC105 pins 7 and 32? NO R158 is defective. YES Is the signal sent to IC105 pin 12? YES R145 and R146 are defective, or IC105 is defective. NO IC105 or the control line to IC106 is defective. 2 - 55
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