dead usb on 4550

gopher · Post by **gopher** » Mon Apr 16, 2012 3:20 am

picked up a couple of surplus 4550's. Same cable Same computer one radio read and writes fine. The other never even activates as an active USB device insertion. The service manual for a 4{3,5}80 shows the rear accessory connector USB2 ESD protection diode D4000.

My 4550 board is probably totally different but my guess it the interface circuity is similar. Suggestions?

Post by **escomm** » Mon Apr 16, 2012 7:28 am

What is the firmware version? R01.08.20 had some issues with connectivity. May not be a hardware problem.

gopher · Post by **gopher** » Mon Apr 16, 2012 7:56 am

older then dirt - 1.02 i think

Post by **wavetar** » Mon Apr 16, 2012 9:34 am

Have you tried both the rear accessory cable & the front mic cable?

gopher · Post by **gopher** » Mon Apr 16, 2012 9:45 am

rear yes - front no - looking into it now..

dead usb on 4550

dead usb on 4550

Re: dead usb on 4550

Re: dead usb on 4550

Re: dead usb on 4550

Re: dead usb on 4550