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Kenwood DFC 230 display fault

Discussion in 'Radio Circuits, Repair & Performance' started by VK5JBJ, Oct 7, 2019.

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  1. VK5JBJ

    VK5JBJ Ham Member QRZ Page

    My Kenwood DFC 230 has a display fault. It works fine on 80 meters and basically any band that starts at .5 i.e
    3.500, 24.500 28.500 and 29.500.
    When I switch to any other band on my TS130s say 7MHz for example the read out on the radio will say 7.000 and the read out on the DFC230 will be 500.0 also when this happens a buzzing noise comes from the tiny inbuilt speaker of the dfc230.
    If anyone has any tips on how to fix this issue I would be very greatful.
  2. KM1H

    KM1H Ham Member QRZ Page

    Cant help with that fault but when mine crapped out I was told there are unobtainium IC's in it.
    I picked up another and its been fine for several years.
  3. M6AGL

    M6AGL Ham Member QRZ Page

    I've had problems with display drivers where one segment would go dark compared to others, and would only happen on certain digits.
    Mine turned out to be a bad connection on a switching transistor. This is between the display driver and the segment display so it just wasn't switching fully on. Lucky for me it was discrete components.

    Even if that particular display driver is unobtanium, it would still be possible to design a direct replacement for the display just as long as the problem is not further back down the chain or you will be replacing larger chunks so the time and hassle factor increases.

    Worth checking visually around connections especially if there are cables involved.
    VK5JBJ likes this.
  4. N8YX

    N8YX Ham Member QRZ Page

    There's a connection in the cable which tells the unit it's on a "0.0" or "0.5" band.

    Check the equipment manuals for details (DFC-230 and TS-130S). See which connectors in those DIN jacks and plugs carry the signal, and make sure they aren't oxidized or dirty. Perhaps a drop of DeOxIt on all connectors is in order.

    Did the equipment work previously? A little history here would be helpful.
    VK5JBJ likes this.
  5. KA9JLM

    KA9JLM Ham Member QRZ Page

    My guess would be bad solder connections on the double sided PC board.

    Good Luck.
    VK5JBJ likes this.
  6. VK5JBJ

    VK5JBJ Ham Member QRZ Page

    To be honest I'm not sure. I bought it with the TS-130s about 11 years ago, at the time I didn't feel the DFC-230 was of much benefit to my station so I didn't use it, I tried it out but probably not thoroughly enough to notice the fault. Recently I decided it could well be worth using and discovered the fault.
    Thanks for the pointers. I will look into it.

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