Service manual

GX30

2 – 49

CONFIDENTIAL

(From page 2-48)

Is 3.6 V or more applied to BATT terminal (TP520)? Battery terminals are defective, connector terminal is dirty, or

soldering is improper.

Is the voltage 1.2 V or lower on SENSE terminal (TP506)? The battery is defective or set improperly.

Is there conduction through fuse (FS501)? Fuse (FS501) is blown.

Is 5-level stack memory (IC101) installed properly? 5-level stack memory (IC106) is installed improperly.

Is 2.8 V and 1.8 V applied to VMEM (TP170) and VCORE

(TP171) respectively?

IC103 is defective.

Is 3.0 V applied to VINT (TP173)? IC111 is defective.

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?

X101 (32 kHz oscillator), R167, R169, C174, and C176 are

defective or mounted improperly.

Or oscillating circuit of IC106 is defective.

Is the rectangular wave of 13 MHz properly sent to TP713? IC106, R179, and R110A are defective or mounted improperly.

CN701 and CN102 are connected improperly.

Is the triangular wave of 13 MHz sent from C833? IC801 is defective.

Is 2.9 V supplied from VTCXO (TP801)? Power Supply (IC804) is defective.

IC801 and peripheral circuits are defective.

YES