Service manual

GX30

2 – 68

CONFIDENTIAL

20. USB connection is impossible.

Connect a properly working handset to the Data/USB cable

that is not recognized. Is it recognized?

Reinstall the driver and replace the USB cable to connect the

handset.

Is a communication with the handset established via SPST for

GX30?

IC106, IC502, and IC504 are defective.

Connect to a Data with the USB cable.

Is TP536 at “H”? The signal line from CN502 pin 8 to IC106 pin 90 is short-cir-

cuited with GND. Or R566 is has come off.

Is 5 V or more applied to TP515? CN502 is connected improperly.

Is Q503 pin 3 at “L”? Q503 is defective.

Is 3 V or more applied to TP166? IC103 or IC106 is defective.

IC106 and IC502 are defective.

YES