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Kenwood amp blowing its fuse

Discussion in 'Electronic Repair' started by Sune T. B. Nielsen, Sep 18, 2004.

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  1. Hi
    I found a Kenwood KA 6000 HiFi amplifier.
    When i power it on the small indicator lights are on, but no sound at all.

    It has three replaceable fuses on the back of the cabinet. two 5A and one
    that has this text "4A (6x30) SCHURTER". These are all intact. I had a look
    inside and found 2A fuse that was intact and then a burned F5A fuse soldered
    between a red wire coming out of a large black box that i guess i a
    tranformer(?). This box is 11½ by 9½ by 9½ cm and on it is written 01-191W
    (not sure it the last digit 01-19_W). At one side there is coming two red
    wires, a blue a black. At the other side it has a white, a black a yellow
    and a red coming out. the white one is going to the 4A fuse on the back of
    the cabinet.

    At the other end the burned F5A fuse is connected to a point where three
    capacitors are connected. Or at least one 0.022 capacitor and two things i
    newer saw before which i GUESS are capacitors. On the one where i can read
    the text is written "SA-2Z 041". They have the shape of a hat and are made
    out of metal.

    I replaced this fuse, but when i turned on the power there was a short
    buzz/hum and then nothing. I looked at the fuse was burned again.

    Generally the insides look very clean and healthy. I se no liquids, sings of
    smoke/burning or the like. Yet i didnt discover any loose wires og short
    circuits.

    Any ideas where to look now?
    I can describe some more if that helps.

    Thanks in advance

    Sune
     
  2. Chuck

    Chuck Guest



    My guess is that you have a shorted output channel . (ie shorted or
    open output transistors, driver transistors, and bias transistor. )
    There is a chance that the power supply diodes are shorted instead.
    Chuck
     
  3. James Sweet

    James Sweet Guest

    One or more transistors is likely shorted, you'll have to locate and replace
    those, probably replace some bias resistors then readjust the bias levels.
    My guess is you're in way over your head with this one.
     
  4. Guess youre right. I will put it back in the garbage where i found it.

    Thanks for your time both of you

    Sune
     
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