APX GCAI USB connection not responding

[k2cb]

I have an APX8000 that is no longer responding to a USB port connection. I've tried multiple computers, different programming cables, etc. The go to pc and programming cable are both used regularly and successfully on other radios all the time. All of a sudden this one radio is no longer registering a USB connection when connected to a pc. I can still read and write the radio fine via BT or WiFi via RM. It is as if the GCAI USB port has failed. Radio was successfully read one day, and failed to read/write the next day.

The radio was not subjected to any sort of abuse. I verified the flex connector is seated properly on the expansion board.

Looking at the service manual, I suspect one of the ESD protection devices on either the GCAI connector board or expansion board has failed, or worse yet, the USB I/O on the VOCON board.

Has anyone seen this failure mode? If so, what was the point of failure?

Once again, the pc and cable have been ruled out.


Eric
K2CB

 

[Tech21]

Yes, it's a common failure point. I have seen it several dozen times on different APX models. The only real prevention is making sure people have dust covers on them if they don't have an RSM connected to the radio.

Talk to your local dealer and have it sent to depot for repair if it is still under warranty.

You can try cleaning the contacts, breaking the radio down and reseating the connections but chances are you'll have to send it in.

 

[k2cb]

What was the actual failure point?

GCAI board?
Expansion board?
VOCON board?