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Old 6th March 2013, 05:13 AM   #11
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I contacted Peavey usa with the serial# and they sent me the 1989 series schematic. I mentioned in my original post that the power supply is not connected to anything?Thats probably why there is no continuity to chassis on the power board? I just measured switch 2 and I think it may be the problem because its all over the place from 30vac to 250vac on both 220v and 240v? Im being super careful that I dont burn this amp out because its not mine,if it was mine it would be a different story LOL.

Last edited by redrooster; 6th March 2013 at 05:17 AM.
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Old 6th March 2013, 07:28 AM   #12
Enzo is offline Enzo  United States
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You can hard wire around that switch, but if your secondary voltages are right, then I tend to doubt that switch is a problem. I have to ask what you are measuring voltage with respect to on that switch?

Quote:
I mentioned in my original post that the power supply is not connected to anything?Thats probably why there is no continuity to chassis on the power board?
OK, I assume you mean the connections to the channel boards? But all the wires trail off to somewhere, and one of those ought to be a chassis connection? My underlying concern is that whatever we are using as a reference point - usually the chassis - for ground might not be connected to the common of this supply?
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Old 6th March 2013, 08:05 AM   #13
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Quote:
Originally Posted by Enzo View Post
You can hard wire around that switch, but if your secondary voltages are right, then I tend to doubt that switch is a problem. I have to ask what you are measuring voltage with respect to on that switch?



OK, I assume you mean the connections to the channel boards? But all the wires trail off to somewhere, and one of those ought to be a chassis connection? My underlying concern is that whatever we are using as a reference point - usually the chassis - for ground might not be connected to the common of this supply?
I cleaned the switch then connected the main board up and everything is working pos 76vDC neg 76vDC Pos15.5DC, Neg15.4DC and 24vDC. Except for 1 channel,all the output transistors are working.I think it maybe on 1 driver board I checked all the transistors were OK then recapped it and moved it to the other side and the problem went with it.One side has the green light when the relay clicks in, the problem side has no lights at all? The 15v regulator is OK,so it must be the op-amps do you think?
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Old 6th March 2013, 02:26 PM   #14
Enzo is offline Enzo  United States
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Each channel has a 15v regulator and some transistors to make the -15v track it. Make sure you have BOTH supplies right at the chips.

Oh, but first, check to make sure your dridge/stereo switch on the rear is set to stereo.
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Old 7th March 2013, 04:18 AM   #15
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Ive posted on the solid state forum because the problems with this amp were heading away from the power supply sort of? LOL.
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