Connect with us

Stereo Receiver Right Channel Distortion.

Discussion in 'Troubleshooting and Repair' started by Rick79, Jun 20, 2020.

Scroll to continue with content
  1. Rick79

    Rick79

    283
    5
    Nov 26, 2014
    I have a Harman kardon AVR 10 that has right speaker channel distortion. I don't have a scope or a capacitor tester though, is it possible to find the problem just using a multimeter? What would be the first place or component to check?
    Thanks
     
  2. Martaine2005

    Martaine2005

    2,965
    817
    May 12, 2015
    Have you tried the LEFT speaker on the RIGHT channel?.
    Can you rule out speakers and speaker wiring?.

    Martin
     
    davenn likes this.
  3. Rick79

    Rick79

    283
    5
    Nov 26, 2014

    Yeah, I ruled out the wiring and speakers trying different speakers and wires and also listening with the headphones, I didn't hear any distortion in the headphones. I already checked the pots and the balance and volume and that's not it. Not sure if it would be a dirty speaker relay, but I'm not sure if it even has one.
     
    Last edited by a moderator: Jun 21, 2020
  4. Ylli

    Ylli

    338
    93
    Jun 19, 2018
    No speaker relay. There is a protection scheme though, an amplifier overcurrent or high offset will trigger the CPU to turn off power. So anyway, it's not a dirty speaker relay. If the distortion is most noticeable at low volumes, and mostly goes way at higher volumes, it could be an issue with Idle current.
     
  5. Rick79

    Rick79

    283
    5
    Nov 26, 2014
    It sounds worse as you raise the volume. Sounds like it's being blasted on that channel.
     
  6. Martaine2005

    Martaine2005

    2,965
    817
    May 12, 2015
    As you have a multimeter and one good working channel, you should be able to check and compare voltages.
    Open it up and take some close, clear photos of both sides of the board.

    Martin
     
  7. Martaine2005

    Martaine2005

    2,965
    817
    May 12, 2015
    Edit: this audio video receiver has front and rear speakers, so quite a bit more complex.
    Does the balance control Left front and left rear?.
    Is the distorted channel Front and Rear speaker?.

    Martin
     
  8. Rick79

    Rick79

    283
    5
    Nov 26, 2014
    No, the balance doesn't control the rear speakers left and right and no, there is no distortion in any of the rear channels
     
  9. Martaine2005

    Martaine2005

    2,965
    817
    May 12, 2015
    Perhaps you need to explain where and when the distortion occurs?..
     
  10. Rick79

    Rick79

    283
    5
    Nov 26, 2014
    There is distortion in the front Right channel only, all the other channels are fine. I hear it when playing the radio and when using the inputs.
     
  11. Ylli

    Ylli

    338
    93
    Jun 19, 2018
    Does the unit have pre-out/main-in jumpers? If so, you could cross them (right out to left in, vice versa) and see if the problem changes channels.
     
  12. Rick79

    Rick79

    283
    5
    Nov 26, 2014
    Yeah it does. I've tried that and It still has distortion on the right
     
    davenn likes this.
  13. Rick79

    Rick79

    283
    5
    Nov 26, 2014
    Photos of the HK AVR10
     

    Attached Files:

  14. Rick79

    Rick79

    283
    5
    Nov 26, 2014
    R223R was burnt and fell apart when I poked it. It shows its an 82 ohm resistor, but what does 1/5W +5% mean? Does it have to be a specific kind?
     
  15. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,418
    2,788
    Jan 21, 2010
    Where is R223R in your images?
     
  16. Rick79

    Rick79

    283
    5
    Nov 26, 2014
     

    Attached Files:

  17. Rick79

    Rick79

    283
    5
    Nov 26, 2014
    Q210R was leaning against it where it was mostly burned on the resistor
     
  18. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,418
    2,788
    Jan 21, 2010
    OK, so you could replace the resistor, but it will most likely get hot and burn out again. (or there may have been a short with Q210R, and it has magically survived).

    If it does, then we can search nearby for the faulty component.

    Did anyone short the speaker terminals by accident? Or play something extremely loud? If we know what happened just before you noticed the fault, it could be useful in figuring out what went wrong.
     
  19. WHONOES

    WHONOES

    952
    248
    May 20, 2017
    Have you measured the dc output voltage of the channel in question with respect to 0V assuming it has a split supply.
     
  20. Rick79

    Rick79

    283
    5
    Nov 26, 2014
    No, I forgot about that, but I will. Thanks
     
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day

-