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Flex1500 USB failure due to 3,3V regulator

on7wp
on7wp Member ✭✭
in FLEX Series (Legacy) Radios
My Flex1500 no longer talks to the PC. The blue light turns on.

I found out the 3,3V regulator powering the USB circuitry is dead. I took out the regulator and still measure a short circuit on the output, so my best guess is a shorted Tantalum cap.

However the Flex1500 service manual shows a different design as my board. My regulator has a diode in serie with the input not present on the published service manual.

Difficult faultfinding like this...

Is there anybody who has a more recent service manual or can me give tips to what component might cause the short ?

Pedro AA9HX-ON7WP-C5WP
pedro.wyns@gmail.com

Comments

  • Trucker
    Trucker Member ✭✭✭✭

    You might try contacting Troy Radio in Troy, Texas. ( they have a website) They may be able to help you. They are the Flex Radio authorized service center for Flex Radio's legacy radios.

    James

    WD5GWY

  • Erik Carling EI4KF
    Erik Carling EI4KF Member ✭✭✭✭

    Or even the Flex Radio repair centre for EU owners in Germany.

    frs-service-eu@t-online.de to ask Norbert Wrede about the issue.

  • on7wp
    on7wp Member ✭✭
    I don't need service, can do that myself with the right docs.
  • Erik Carling EI4KF
    Erik Carling EI4KF Member ✭✭✭✭

    Yes but he might have them and could provide the info you need. He repairs them after all. This is also what James was saying but I thought the EU engineer would be more convenient to ask. It's just an email but up to you of course.

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