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Radioshack 250 Watt Stereo PA Amplifier Left Channel not working.

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

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  1. Rick79

    Rick79

    268
    3
    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. bikemech

    bikemech

    264
    36
    Oct 23, 2014
    Hello,
    Have you got a schematic for it?
    I think that would be the best place to start,
    Pete.
     
  3. Rick79

    Rick79

    268
    3
    Nov 26, 2014
    No. I wish i did lol. Im taking it apart right now to see under the board.
     
  4. bikemech

    bikemech

    264
    36
    Oct 23, 2014
    Does it have model numbers or annthing printed on the main board?
     
  5. Rick79

    Rick79

    268
    3
    Nov 26, 2014
    No. Just.Radioshack 250 watt stereo PA Amplifier on the face and back.
     
  6. Rick79

    Rick79

    268
    3
    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. davenn

    davenn Moderator

    13,439
    1,808
    Sep 5, 2009
    well done :)
     
    Rick79 likes this.
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