Question about Harman Kardon AVR 335 Receiver
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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Posted on Jan 02, 2017
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