Sharp GX30 Service Manual - Page 57

(From page 2-48) A CONFIDENTIAL GX30 Is 3.6 V or more applied to BATT terminal (TP520)? YES Is the voltage 1.2 V or lower on SENSE terminal (TP506)? YES Is there conduction through fuse (FS501)? YES Is 5-level stack memory (IC101) installed properly? YES Is 2.8 V and 1.8 V applied to VMEM (TP170) and VCORE (TP171) respectively? YES Is 3.0 V applied to VINT (TP173)? YES Is the waveform of signals from R169 connected to X101 (32 kHz) correct? Are R167, R169, R174A, C176, X101, and IC106 good in appearance and mounted properly? YES Is the rectangular wave of 13 MHz properly sent to TP713? NO Is the triangular wave of 13 MHz sent from C833? NO Is 2.9 V supplied from VTCXO (TP801)? YES IC801 and peripheral circuits are defective. NO Battery terminals are defective, connector terminal is dirty, or soldering is improper. NO The battery is defective or set improperly. NO Fuse (FS501) is blown. NO 5-level stack memory (IC106) is installed improperly. NO IC103 is defective. NO IC111 is defective. X101 (32 kHz oscillator), R167, R169, C174, and C176 are NO defective or mounted improperly. Or oscillating circuit of IC106 is defective. YES IC106, R179, and R110A are defective or mounted improperly. CN701 and CN102 are connected improperly. YES IC801 is defective. NO Power Supply (IC804) is defective. 2 - 49