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Kenwood tk-x90 series troubleshooting

Discussion in 'On the Road' started by KK6YDB, Feb 18, 2020.

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  1. KK6YDB

    KK6YDB Ham Member QRZ Page

    Hello all, I have a dual band kenwood tk-690/790 and I am having issues with it turning on. I removed the two resistors and moved the one resistor per the service manual and placed the tk-690 on the lower band where the remote head/dual band connection runs to. I mounted this setup in my 1986 f-250 and have the ignition sense cable running to a add-a-fuse on the fuel selector fuse in the fuse box since the add-a-fuse is only rated to 10 amps. The fuel selector fuse is only on when the key is on. But whenever I turn the key I’ll either get no response or it’ll turn on with a bunch of black blocks all over the screen. Does anyone know what might be wrong and be able to help me fix this issue? I have used these radios separately in the past and they both worked flawlessly but since I put it in dual band setup so I don’t have a bunch of radios in my truck. I get no response or any luck trying to get it on so I can reprogram them. Thanks all.
  2. N7WR

    N7WR Premium Subscriber QRZ Page

    It has been years since I had that duo band combo in a public safety vehicle that was assigned to me. I do recall that a low supply voltage will cause the symptoms you describe. Those two radios combined, particularly if they are the higher power versions have a pretty big draw even when not transmitting. I would disconnect from the current 12 vdc source and run directly to the battery with some pretty heavy gauge wire with the F 250's engine running. If that solves the problem (and I suspect it might) then a new 12vdc power cable from the battery to the radios is in order
  3. KK6YDB

    KK6YDB Ham Member QRZ Page

    Unfortunately the truck doesn’t run at the moment due to a few issues and it will be a while before I can get it running. For the record it’s a diesel and requires two batteries but I can hook it up to a charger and see what happens, thank you for the help.
  4. N7WR

    N7WR Premium Subscriber QRZ Page

    Good luck

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