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Kenwood SW900 now dead

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    Kenwood SW900 now dead

    I started having problems turning it on some time ago and it took quite a few attempts to get it to turn on and stay on. Now its no longer turning on at all.
    I notice its discoloured around some resistors and a 2200 Cap. I replaced the cap but still wont turn on. I would be very grateful if someone could guide me to getting this working again.
    Here are some pictures

    #2
    The 5 light grey resistors in the fist photo have been getting very hot and some are not testing properly so its best i replace them first. Please can someone tell me what type of resistors these are?

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      #3
      did you check that power is comming out of the transformer?
      in old linear gear the power switch can fail because of the inrush.

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        #4
        Originally posted by stj View Post
        did you check that power is comming out of the transformer?
        in old linear gear the power switch can fail because of the inrush.
        Yes i am reading 240 vac in and various voltages coming from the 5 outputs.

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          #5
          Have you checked any of the dc voltages? like +12vdc, -12vdc, 5.5v Based on the color of the board around those resistors (which are very likely ok) I would first resolder their connections as they are likely poor. There are many small electrolytics in that low voltage section that are likely bad, C116 (10µf/50) and C118 (1µf/50) are in the reset circuit and could cause strange operation.
          Last edited by R_J; 12-11-2024, 08:59 PM.

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            #6
            Originally posted by R_J View Post
            Have you checked any of the dc voltages? like +12vdc, -12vdc, 5.5v Based on the color of the board around those resistors (which are very likely ok) I would first resolder their connections as they are likely poor. There are many small electrolytics in that low voltage section that are likely bad, C116 (10µf/50) and C118 (1µf/50) are in the reset circuit and could cause strange operation.
            Thank you very much R_J there there a couple of those caps in that area that were not giving the correct value when tested. 1st of 2 jobs done.
            Cheers.

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