Question about Harman Kardon AVR 120 Receiver

2 Answers

Harman Kardon AVR 120 turns off by itself after normal work for about 1 min

My Harman/Kardon AVR 120 receiver turns off by itself after normal work (no overheating, good sound) for approx. 1-1.5 min in any mode. After pushing main switch On again it works normally (with no problems) for the same amount of time and turns off again. After pushing power On again it works for another ~1 min then shuts off and so on... It does the same even without any load (speakers disconnected) and everything else disconnected except power cord.
Does somebody have any idea what could be wrong? Thanks.

D.K.

Posted by on

  • higlider Dec 09, 2007

    Harman Kardon AVR 120 in last month turns itself off about a minute after it is first turned on. Turning it on again it would stay on. But now it has to (go off, be turned on) four times before it will stay on. Once it decides to stay on it is ok thereafter, until it is turned off and cools down. Experts, what is the fix? I hope it is not to discard the unit because I love it and the sound it delivers!

    -higlider

  • mitkos Jan 05, 2008

    I finally fixed the above problem by myself! This is what I did:

    First, I discovered the AVR 120 stopped switching 0ff by itself after I disconnected Surround Amp board from Main Amp board - plugs CN 606 or CN417, and WA625 or CN 425 (surround L- and R- inputs). Then I replaced all (just in case) electrolytic capacitors on Surround Amp board with new ones (there are only 15 of them), considering this unit is almost 7years old, so they might be "dried out", especially those which are closed to heatsink (4x470uF/50V). Second, I also reset this unit as per Service Manual by pressing and holding together Tone Mode (6) and FM Mode Selector (12 ) while the unit is in Stand By mode. It works now like NEW!!!

    P.S. You can find schematics and complete Service Manual at http://manuals.harman.com/HK/Service%20M... It helped me a lot in troubleshooting and fixing my problem. I hope the above info will help everybody. Good luck!

    And THANKS to everybody who responded to my question.



    D.K. (mitkos)

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2 Answers

Followup on higlider's problem. Now it has to be turned on ten times before it stays on. Email from Harman Kardon only suggests taking it to an authorized repair shop. It is clear that it is not from speaker short or overheating, because it only happens when the rcvr is cold.
-higlider

Posted on Jan 05, 2008

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  • 8 Answers

Do you get an indication on the display where the point of failure might be? It would show up on the LCD speaker diagrams just before shutting off.

Posted on Dec 28, 2007

  • yldouright Jan 06, 2008

    The front panel will indicate the boards which cause the start up diagnostic to fail. Open the unit and detach the problem boards, then apply the power. What do you see now?

  • yldouright Sep 10, 2009

    Do you get an indication on the display where the point of failure might be? It would show up on the LCD speaker diagrams just before shutting off. If not, then you will need to replace capacitors

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