peavey amp troubleshooting

Discussion in 'General Electronics Chat' started by praux, Mar 27, 2011.

  1. praux

    Thread Starter New Member

    Mar 27, 2011
    I have a Peavey amp, actually I have a pile of them, that's not outputting any power (output terminals and LED aren't on). I'll say it now, I can't take any pictures of it due to the fact it's at work and no pic's allowed there so I'll try and explain it as best as possible. I've tested most of the transistors and they seem to be fine and none of the caps are blown. A lot of the resistors seem to be measuring higher than what they're supposed to be (eg. .33ohm res. is measuring .7ohms), could all those resistors add up and be blocking too much of the voltage? Any help is appreciated and I'll answer questions with what I know.
  2. Adjuster

    Well-Known Member

    Dec 26, 2010
    It is difficult to measure low resistances like 0.33Ω accurately with an ordinary meter and simple test leads. Are you sure that you are not being misled by lead resistance? If it is true that a large number of low resistances have increased value, I would suspect that there may be some underlying cause which may have overloaded them.

    That said, if you are not allowed to take pictures of these things, should you be trying to investigate them?
  3. praux

    Thread Starter New Member

    Mar 27, 2011
    I appreciate your help since this one has me stumped and all, but I don't see why me not being able to take pictures would cause me not to try and work on them a bit; I work for a casino and they just don't allow pictures at all. I'll see what I can do when I go back though.
  4. Roberto Suarez

    New Member

    Nov 3, 2014
    Sometimes is very helpful that this people get orientation. You can't measure resistors directly connected to a circuit board. Since they are already part of a circuit network which includes so many other devices, the measuring is almost for certain biased. The correct way to proceed in this cases, if you don't have a profound eye and experience with these units, is to measure amplitud of voltage between stages of amplification until you detect where you have a wrong voltage. There are two kind of voltages DC and AC. For this you need two know the stages and what are the supposed voltage levels expected. Once you narrow the failure point you may proceed from there. You people need to understand that if you don't have real knowledge of what is going on, you are to cause more harm than solving. If you don't have great eye for this situations you need for certain schematics of your equipment. Without them is like solving a puzzle with zero clues.
  5. studiot

    AAC Fanatic!

    Nov 9, 2007
    Should I have any sympathy with a commercial organisation that can afford to simply buy new ones?

    when they should be perhaps changing the fuse

  6. Papabravo


    Feb 24, 2006
    Can you remove the amps from your place of employment for the purpose of taking pictures?
    How about sending the amps to a qualified repair shop?
    Isn't there one in your basement?
    They are certainly worth nothing in their present condition.