Icom 736 Lost Programming Data

Discussion in 'Radio Circuits, Repair & Performance' started by K5RWD, Jan 14, 2019.

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  1. K5RWD

    K5RWD Ham Member QRZ Page

    Lost all data/programming

    I was able to get this radio back up and fully functioning until I decided to replace the display lamps (pain in the butt). I replaced the two outside inner lamps with LED's successfully however when I drilled the third hole for a center lamp, I lost all radio programming. All lights come on and some buttons work, but it's like it lost all of it's memory and data. I checked where I drilled and it was only through ground padding no traces, so I only surmise that during the process a voltage spike hit the Eprom and dumped the data. I know everything in the other circuits are perfectly functional, so it would be a shame to have to scrap it for this reason.

    I have not been able to find any information on how to get this thing reprogrammed. If anyone has an idea send it my way. I would greatly appreciate it.

  2. N2AYM

    N2AYM Ham Member QRZ Page

    If it is the memory battery that went south that will be an easy replacement.
    It is a CR-2032 Lithium battery located on the back side of the front panel
    which just swivels to reveal the rear of the front panel(logic unit).
  3. K5RWD

    K5RWD Ham Member QRZ Page

    Thanks, I will check that but I would assume that even if the battery was bad that I would still have data but it just wouldn't save it at reboot. Will check and replace and see what happens.

  4. K5RWD

    K5RWD Ham Member QRZ Page

    Battery replacement did not help. I believe either the processor is bad or data has been dumped.
  5. VE1IC

    VE1IC Ham Member QRZ Page

    I don't think the eprom is bad, but it could be. Wouldn't be the first time. This unit doesn't have a RAM card like some other Icom IC-745,751,761,471,271's had. IC4 on the logic unit should be the ROM in a socket. Take the 27C256 eprom out and try to read it in a programmer like a TL866 etc. If it is full of FF's well you know it is really bad. Usually they drop a bit here and there first, but some radios just died. You can copy a working eprom from a 736 and put it on a new eprom. The eprom doesn't have a window on top for erasing, so it can be programmed one time only. I've got a 735, but that's not going to help you any.

    read this: http://www.eevblog.com/forum/rf-microwave/icom-ic-736-front-panel-problem/
    Last edited: Jan 20, 2019

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