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Radioshack 250 Watt Stereo PA Amplifier Left Channel not working.

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Discussion in 'Troubleshooting and Repair' started by Rick79, Mar 1, 2015.

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  1. Mar 1, 2015 #1
    Rick79

    Rick79

    283
    5
    Nov 26, 2014
    The protection mode isnt on, I get only the right side channel through the speaker outputs and the headphone jack. I checked the fuses and the main board inside, I dont see anything burnt or feel anything getting real hot. I did noticed this one Diode D127 next to the speaker relay switch, it reads .179 across both ways. Could another component cause this reading or is it just a bad diode? Could this be the reason and maybe the only reason the Left Channel is out?

    Ive checked all other diodes in the area and all resistors besides R194, i posted a photo of it too, it looks like it has 5 bands but im not sure.
     

    Attached Files:

  2. Mar 1, 2015 #2
    bikemech

    bikemech

    381
    39
    Oct 23, 2014
    Hello,
    Have you got a schematic for it?
    I think that would be the best place to start,
    Pete.
     
  3. Mar 1, 2015 #3
    Rick79

    Rick79

    283
    5
    Nov 26, 2014
    No. I wish i did lol. Im taking it apart right now to see under the board.
     
  4. Mar 1, 2015 #4
    bikemech

    bikemech

    381
    39
    Oct 23, 2014
    Does it have model numbers or annthing printed on the main board?
     
  5. Mar 1, 2015 #5
    Rick79

    Rick79

    283
    5
    Nov 26, 2014
    No. Just.Radioshack 250 watt stereo PA Amplifier on the face and back.
     
  6. Mar 1, 2015 #6
    Rick79

    Rick79

    283
    5
    Nov 26, 2014
    I pulled the diode out and it tested good. So i started inspecting the board and i found that the coil for the left channel was loose. I soldered the loose lead and that fixed it.

    Yessssss!
     
    bikemech likes this.
  7. Mar 2, 2015 #7
    davenn

    davenn Moderator

    13,721
    1,913
    Sep 5, 2009
    well done :)
     
    Rick79 likes this.
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