Question about Harman Kardon AVR 235 Receiver

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Wont stay on.

My harman kardon AVR 235 wont stay on. When I turn the power on it starts up then says protect and shuts of. Also the front right channle has no sound coming out( for the 3 seconds that it stays on) but all the other channles work fine.How do I fix this?

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  • sub guy Jul 01, 2008

    Thanks so much. how much would it cost to get it fixed? Is it just one piece or is it all the little resisters and transisters of the whole channel?

  • sub guy Jul 01, 2008

    Is there any way to pinpoint what is blown?

  • sub guy Jul 01, 2008

    Well thanks for giving me a starting point. I wouldnt try to solder new pieces in, i'm not that skilled. Now at least I can figure out what is blown. Thanks!

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  • Master
  • 624 Answers

The only way you can fix this is you have the proper tools and have very good soldering skills. If so, I will post more instructions on how to fix this.

It has a blown channel, it can not be fixed without some good troubleshooting skills. The protect mode is so you don't cause more damage to it. If you continue to turn it on, you may cause more damage.

Your best bet is to take it in to get repaired at a service center.

Let me know if you require more help,

Dave

Posted on Jul 01, 2008

  • 1 more comment 
  • Dave DeGain
    Dave DeGain Jul 01, 2008

    The price would depend on just how bad the channel is blown. It would be most likely the 2 output transistors, a couple of resistors and maybe a couple of driver transistors for that channel (if it is a blown channel, sometimes it can be something different but this is most common). The price cost for that type of a repair runs anywhere from $120 to $175 depending on the cost of parts and the labor rates of the shop. This receiver is a decent one, so the repair would probably be less than a new one by a good margin.



    Glad I could be of some help to you.



    Dave

  • Dave DeGain
    Dave DeGain Jul 01, 2008

    Yes, by troubleshooting the circuit. If you have a multimeter you can check most of the components. You would also need a soldering iron, solder, solder wick (to remove solder) and possibly an O-scope (depending on how difficult isolatiing the problem is). it is good to have very good soldering skills, one little mistake, like a solder bridge, will blow up all the parts you just replaced, and sometimes more.



    You can start by using a multimeter and put it in the ohms check mode. Any shorted transistors will measure very close to zero ohms across 2 of the 3 legs. Check every combination of 2 legs( 2 outside legs, middle and 1 outside, middle and other outside). Sometimes a transistor is bad that does not measure shorted. it can also be open.



    The resistors have a color code, let me know what color the bands are and I can tell you what value they are. If they are burned up and the color bands can not be determained, you need the schematic to see what value they are.



    The reason I advise against doing it yourself is that if you miss one bad component, or put a transistor in the wrong way, or a capacitor in wrong, you will burn up that channel and have to start all over again. It really is not as easy as you may think. Some amplifier circuits are very difficult for even a seasoned technician who repairs amps all the time, they can have fits trying to figure out all the problems.



    It would take me hours of communications back and forth with you to guide you thru all that would need to be done. As much as I would like to help, that is just not a feasable thing for me to do, I really don't have that much free time. If you have some knowledge of electronics and soldering skills, a good amount of help would be needed still.



    You could at least start by unsoldering all the output transistors (the ones on the heat sink) and check them out of circuit to see if any are shorted. Then you at least know what channel to be looking at.

  • Dave DeGain
    Dave DeGain Jul 01, 2008

    No problem, and good luck with it!



    Dave

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