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Possessed Peavey 2600

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  • #1

    Possessed Peavey 2600


    Hi
    My name is Pam and I have a little repair shop in Texas. I am having a hard time with this 2600 that just seems to have one problem after another. I have replaced all the Transistors and Caps on the B channel and it is still showing a short somewhere. Can anyone help me with this thing. I sure would appreciate it.
    Thanks
    Pam
    Tags: None
  • #2
    What does "still showing a short" mean? What is the amp actually doing?

    The schematics can be had by asking for them at parts@peavey.com

    Since it is a PV, most all their solid state power amps have a crowbar triac across the output. When it senses DC, it triggers the triac which shorts across the output. This prevents the speakers from catching fire. Unfortunately the triac usually gives up its life in the process.

    With power off, measure resistance between the speaker output posts. Or if there are no terminals, then measure across the jack. if it appears shorted across, then the triac is shorted. The triac is a TO220, a SAC187 type usually. The triac for each channel is located in the middle of the board right next to the output inductor.

    FIlter caps were not likely bad.

    Are you operating without a load? Solid state amps do not need a load, so until we are sure the thing is not producing DC, leave the load off. The load can be the difference between blowing fuses or not.

    Do you have a variac? Blown SS power amps are THE place to have a variac.

    Welcome to the forum.
    Education is what you're left with after you have forgotten what you have learned.

    Comment

    • #3
      When I turn my variac on and slowly turn up to volts the amperage goes up and then it shuts off. I took the caps out and checked them with a sencore LC102 and all 4 were bad on the B channel. If I take the wires from the A channel and slowly put them on the B channel. The amp will work until I get to the last 3 then the amp will turn off. I followed 2 of them to the caps. I checked the output with the meter and there was little (milivolts or no volts at all)

      Originally posted by Enzo View Post
      What does "still showing a short" mean? What is the amp actually doing?

      The schematics can be had by asking for them at parts@peavey.com

      Since it is a PV, most all their solid state power amps have a crowbar triac across the output. When it senses DC, it triggers the triac which shorts across the output. This prevents the speakers from catching fire. Unfortunately the triac usually gives up its life in the process.

      With power off, measure resistance between the speaker output posts. Or if there are no terminals, then measure across the jack. if it appears shorted across, then the triac is shorted. The triac is a TO220, a SAC187 type usually. The triac for each channel is located in the middle of the board right next to the output inductor.

      FIlter caps were not likely bad.

      Are you operating without a load? Solid state amps do not need a load, so until we are sure the thing is not producing DC, leave the load off. The load can be the difference between blowing fuses or not.

      Do you have a variac? Blown SS power amps are THE place to have a variac.

      Welcome to the forum.

      Comment

      • #4
        Very unusual to have cap failures. Make sure the rectifiers to them are OK.

        SO, is the output shorted across? That would be consistent with your variac findings.
        Education is what you're left with after you have forgotten what you have learned.

        Comment

        • #5
          Pv2600

          I will check the outputs and the rectifiers today. I don't know what they did to this thing but it has had a lot of things wrong with it.

          Originally posted by Enzo View Post
          Very unusual to have cap failures. Make sure the rectifiers to them are OK.

          SO, is the output shorted across? That would be consistent with your variac findings.

          Comment

          • #6
            Speaking of the SAC187, can I run the amp without it in there, at least to test it?

            Comment

            • #7
              Yes, you can run without the SAC187 on the bench, it is only there as protection for your speakers. Replace it before returning the amp to the customer though.
              Education is what you're left with after you have forgotten what you have learned.

              Comment

              • #8
                Pv 2600

                I have a dead PV 2600. When you turn it on it lights up as it should then gives the normal pop through the speaker but seems to have no output at all on either channel.

                Any help would be appreciated.

                Comment

                • #9
                  Hi Stearman, welcome to the forum.

                  may I suggest you vector this problem to its own new thread instead of adding it on to this old one. DOn't like having one conversation about two repairs, it gets confusing. SHould be VFR all the way to a new thread. Keeep your tail up and we'll see you there.

                  On the way, be thinking about the input circuits and the power suplies for them.
                  Education is what you're left with after you have forgotten what you have learned.

                  Comment

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