Sharp GX30 Service Manual - Page 76

USB connection is impossible., Is Q503 pin 3 at L? - driver

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GX30 20. USB connection is impossible. CONFIDENTIAL Connect a properly working handset to the Data/USB cable that is not recognized. Is it recognized? YES Is a communication with the handset established via SPST for GX30? YES Connect to a Data with the USB cable. NO Reinstall the driver and replace the USB cable to connect the handset. NO IC106, IC502, and IC504 are defective. Is TP536 at "H"? YES Is 5 V or more applied to TP515? YES Is Q503 pin 3 at "L"? YES Is 3 V or more applied to TP166? YES IC106 and IC502 are defective. NO The signal line from CN502 pin 8 to IC106 pin 90 is short-cir- cuited with GND. Or R566 is has come off. NO CN502 is connected improperly. NO Q503 is defective. NO IC103 or IC106 is defective. 2 - 68

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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.
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES