Question about Harman Kardon AVR 25 MKII

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HK AVR25 MKII goes on and off numerous times on cold power up

When I turn on my HK receiver it turns itself on and off numerous times. This only happens on a stone cold powerup and only the first time I turn it on each day. Once it stops switching on and off it works just fine. It turned itself on and off 154 times today before it began working. Once it is working, if I then turn it off and turn it back on, it works fine. HK said it could be shorted speaker wires and the receiver is going into "protect" mode but I doubt this. The speaker wires aren't moving around. If there was a speaker wire short somewhere that wouldn't fix itself each time I turn it on. They also suggested that it is overheating but it only does it when I turn it on when it is at room temperature. The only other suggestion HK gave me was an "internal" problem which likely will cost more to fix than a comparable new unit.

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  • lukievan Apr 26, 2009

    i am having the same problem - when i turn the unit on it starts this
    fast clicking thing where it seems like it is powering on and off very
    fast. Eventually it slows down and finally is 'on' but the time to get
    there is longer and longer.. It's a power supply issue,. ,I'm pretty
    sure, but all the fuses look good. Thanks.

  • poorsparkie May 09, 2009

    Solution #1posted on May 08, 2009
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    poorsparkie

    Rank: Apprentice
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    The relay on the PWR SUPPLY board clicks once when the PWR switch is turned on then 2 to 5 sec. later it clicks again and 'off' it goes.
    The small transformer ( standby power) on the board appears to be leaking crud (looks like wood glue) all along one edge.
    Can I bypass this relay to see if the power transformer is 'ok'?

  • lukievan May 11, 2010

    btw, i think i've isolated the component that is making the noise - it's a small black rectangular piece that's on the circuit board that the fuses are on.

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The relay on the PWR SUPPLY board clicks once when the PWR switch is turned on then 2 to 5 sec. later it clicks again and 'off' it goes.
The small transformer ( standby power) on the board appears to be leaking crud (looks like wood glue) all along one edge.
Can I bypass this relay to see if the power transformer is 'ok'?

Posted on May 08, 2009

  • poorsparkie May 09, 2009

    The FixYa Pro sent me to http://www.eserviceinfo.com for the service manual. With that in hand he directed me to the problem; which is the output amplifer section. 6 transistors on one side and one big IC STK on the other of the giant heat sink in the middle of the unit.

    After I test each transistor I will replace the bad one and hope thats it.

    If anyone has better ideas E me at brockselectric@live.com

    happy sparking

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