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You can contact Peavey and they will send you the schematics. If you can tell me a few characters of what is on the chip I might be able to give you a clue. For power amps they often use the LM3886, an eleven lead power amp clamps to a heat sink. For typical small 8 lead op amps the often use 4560's.
Start out by doing some simple troubleshooting yourself. You have one working channel so substitute the cables from the working channel to the nonworking channel to see if you have a cable problem.Check to see what button settings you have on the amp. One might have been changed by accident. I am assuming your are wired up for stereo and not mono.. Here is a link to the manual if you don't have one:http://www.peavey.com/assets/literature/manuals/80300573.pdf I should also have mentioned to substitute the speakers from the nonworking side to the working side to make sure you don't have a speaker problem. Notice in the manual that it states that the DDT compression switch should be enabled at all times to protect your speakers. Also take note of page 3 Operation notes for both the thermal protection and the DDT circuits. Amplifier failure is usually caused by the failure of another component most often cables and speakers. If a dead short (broken cable or blown speaker) is presented to the amp it may fail no matter how good the protection circuitry is. If the simple tests I mentioned don't help I recommend taking it to a Peavey dealer with a good service shop as they will have access to Peaveys direct replacement parts. The schematic can be obtained but for a proper repair the direct replacement parts should be used. Peavey was one of the brands I serviced when I was still working as the service person for a music store. My eyesight has deteriorated so I am semiretired. Hope this advice helps.
The type of cable you use plays a big role
on amps check all grounds, how long it is
has a lot to do with it
You may have a bad cap.inside or even on the
input of your plug.
A bit late, but I'll give it a try.
You can measure the outputsignal before the relay.
Often there's a coil, measure if you've got a DC level at that point.
If so, you're power amp is down.
Normally when the relay doesn't switch there's a DC level in your amp.
If you switch on the amplifier, do you hear nothing at all?
Or do you hear low level noise or hum out of the speaker? Don't know if you're technician.
If the tubes are glowing, you can measure the high voltage.
Check also fuse 3 and 4, thats the neg. voltage -27V and -14V.
It sounds as though you are pointing the peavey at the band in a practice situation? If so make sure that each speaker is at about 60 degree angle to either side of the back of the mike (you facing the speakers), most mics reject feedback when the the user is directly in front of a monitor, but Beta 58s' tend to feedback more in that situation. Alternatively (if it is a practice room situation), why not place the speakers behind the band at 60 degrees each and turn to face the band.
I'm not a pro on amps but I have a Peavey Rage 158 amp, I'd suggest seeing if the speaker itself still works by directly connecting a source onto the speaker[take the wires off and hook it up to a source].
Try turning it on and checking the wattage going to the speaker wire, then follow the wire back and check the big coil with copper wire among other things.
A common problem with old amps are the tubes, check the tubes to see if they are burnt out [google it if you need a guide]
then check on ebay or maybe an electronic/guitar store.
If that didn't help, reply with more details
Good luck.
[If you don't want it ill take it off of you for $20 :p ]
What type of noise is it making? If it sounds like a load hum, you may have a 60 cycle hum issue. This is caused by a capacitor not filtering out the 60 cycle ripple on the DC voltage supplied by the power supply. If you have this problem I would suggest measuring the power supply with a DC voltmeter first and writing this measurement down. Then I would suggest you plugging the amp into an isolation transformer and taking an oscilloscope (plugged into the wall)and measuring the DC voltage while the oscilloscope is set to AC if you see an AC ripple voltage higher then .1mv you have a bad filter capacitor or a bad voltage regulator.
Don't buy Peavey, you get what you pay for.
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