Question about Harman Kardon AVR 335 Receiver

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Not fixed. Hi, Replacing the fusible resistors didn't work; the current is just too much and they would keep blowing. The (auxiliary?) transformer seems to work; 17VAC on the two pins for the resistors. Could it be the 15V voltage regulators? (LM7815 & LM7915) Any help would be much appreciated. Thanks! btw, there are two more 0.47 ohm resistors on the same board that are for something else that I don't know of. The transformer output for these is 10VAC.

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  • shephp01 Feb 03, 2009

    Hi embrod,

    You are absolutely correct; one of the ceramic disc caps shorted. I took it out but never replaced it since i didn't know the capacity and voltage rating. Do you think these would do?

    http://www.mouser.com/Search/ProductDeta...

    (If the link doesn't work, it's Kemet C323C104M1U5HA at Mouser)



    As for the schematic, it would help tremendously if you could send it to me. Are you able to email it? If so, my email adress is simply my fixya user name at hotmail.com.

    I was given this 3-month-old receiver for free last year and it just seems like a shame that it becomes worthless to someone who doesn't know that a 5-cent capacitor is the culprit.

    It was nice of you to post a solution. Thank you so much for your help!

    -Paul

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I know that a couple of you have had the same problem with the blowing 0.47 ohm resistors. I had responded quite a wile back, but forgot to make any updates. Kostiko is correct about the problem relating to these two 0.47 ohm resistors being blown. In my case on two different Haman Kardon models, this was true, but there could also be another issue. What i have found is even after replacing these resistors, the problem appeared to still be there. What was happening was that right after turning the receiver on, the resistors would blow again. What you need to do is replace the two small ceramic disc style capacitors on the same pcb as the fusible resistors, as they could be shorted as in my case. You could remove these capacitors completely, or replace them with a similar size of the same type, as they are really just there for filtering higher frequency noises from the power supply. You can check them with your multimeter first. They shouldn't shorted even in situe. I forget the size, but they are approximately 100 nano farads. Good luck. I have done this to my AVR135, and it has been running great for about 6 months now.

Your voltage measurements for the resistors are correct. The regulators should be fine. Remember that the pins that you are checking come before the regulators. I would double check these capacitors that I am referring to. Do you have the schematic for this? If you need it I have a copy. The transformer has multiple taps coming off of it. You cam check the other resistors, but I'm sure that they will be fine. I suspect the caps.

Posted on Feb 03, 2009

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  • Laser Plus Computers Mar 17, 2011

    hello can you please tell me are these caps on the board connected to the transformer?? i have no sound from an avr230 and it shuts off pretty quick. thank you for your help

  • Laser Plus Computers Jul 25, 2011

    thank you, i am replacing the .47 ohm fusible resistors and the cap c109 .1uf 50v. i have found that the resistors are blown and the cap runs between these 2 17v lines and is probably shorted. newark had the items, had to order qty 8 of the .47ohm 1w. hk part # are krq1ajr47h & ccft1h104zf cap. they could be ordered from hk. i am wondering if i should also replace c107 & c108 .01uf caps that are on these lines? i am hoping this is all for my avr230

  • kostiko Oct 01, 2011

    Actually, the main reason why the resistors keep blowing is the three large capacitors (on the Aux Power Supply board located on the heat sink) are getting dry or in short. Replace them with a higher temperature ratings ones (try 80C) and this would solve your problem. Unfortunately, you`ll have to remove the whole boards (not the main one) and the back plate to be able to access/remove the culprit board. And you will need a very long Phillips screwdriver.

    Good luck

    Kostiko

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