Does anyone have Peavey Transformer 112 schematic?

[Voxman]

Working on an oddball problem that appeared to be a simple bad connection somewhere. As luck would have it, the problem is aggravating since now I'm convinced it's a component breaking down.
This is from a post on another forum about the problem.
Hi
New here....
PEAVEY TRANSFORMER 112 Transtube amp
I've been trying to troubleshoot an odd problem on a friend's amp. The symptom is an intermittent crackling noise. After confirming the problem and removing chassis I did a lot of probing trying to locate cause of noise.
It has been very frustrating to locate the cause due to fact it doesn't appear to be a loose connection or bad solder joint. However since I can probe just about anywhere on the front panel PCB to make it come and go. The strange thing is it doesn't always respond to physical probing to create the problem. But once it starts, I can touch just about anywhere to make it happen... then other times I can hit with a hammer and nothing happens.
Just when you think the problem are is located, next time probing same area nothing happens.
Very odd problem.
Wondering if this might be a problem someone has heard of before. I've resoldered all the ribbon cables thinking that might be where problem is coming from but that didn't help at all. Certain stored programs seem to be very susceptible to noise while others are completely noise free.
Doesn't make a lot of sense.
There is understandably a LOT of components in this amp. I almost think it could be just a component breaking down and not a bad connection.
But I defer to any tech info related to this problem.
I have a short video with the amp doing the noise thing. You can see me probe different parts of the front panel PCB's to make noise come and go.
I'm a tube amp tech with little experience on Peavey transtube amps.
Any and all help appreciated!
If I can upload video I will.

********I WAS UNABLE TO UPLOAD VIDEO TO THIS MUSIC -ELECTRONICS FORUM WEBSITE. Apparently this website doesn't work the way some others do.
Too bad as it clearly gives you an idea what the problem is.
thanks one and all...
IT WOUKD BE GREAT TO FIND THE SCHEMATIC FOR THIS DEVIL.

GARY

[g1]

Schematic attached.
Is the video available on the other forum post? If so, post a link.
One issue that can create problems like you have is a component that is glued down to the board but has a cracked leg (like the main filter capacitors). Those can be quite frustrating and you can not see the problem till you remove the component.

[Voxman]

Here is a link I think.... to the Facebook video I posted there. Hope you folks can access it ok.

https://www.facebook.com/groups/2429...693831285511/?

[Voxman]

g1,
I don't see how to reply to your post. Again other forums have a button to reply to ...

ANYWAY THANKS INCREDIBLY SO MUCH FOR THE SCHEMATIC.... My gawd it's a nightmare of possible components. I just finished examining the 3 pcbs that are connected to front panel. Although I used a high powered eye glass, it was a difficult to see things clearly. And if you really get magnified, the entire soldering job looks rather poor IMHO. There are too many components to realistically check and could easily miss something. I'm hoping with the circuit boards loose, I can fire this guy up and isolate where the area is. So far, probing has gotten me nowhere as it seems no matter what you touch, the noise comes and goes. I'm afraid it being generated by a digital device which will make finding it very difficult.
But at least I have the schematic now thanks to you.

[The Dude]

I'm not saying it's the case here, just passing along something I learned long ago: SOMETIMES, it's faster to just resolder entire boards than it is to find a small solder/connection issue. You can spend hours trying to find a connection issue and much less time just getting out the iron and getting to work.

[Voxman]

I'm not saying it's the case here, just passing along something I learned long ago: SOMETIMES, it's faster to just resolder entire boards than it is to find a small solder/connection issue. You can spend hours trying to find a connection issue and much less time just getting out the iron and getting to work.

Well that could work for a less complicated circuit board but this amp has over a few thousand solder connections. If I started today, I could probably finish around Halloween. 90% of the components are SMD so it could end up causing more problems.
I've contacted Peavey to see if they will bother providing any info that might be useful tracking down this problem. Although I've been lead to believe the problem was just a bad or loose connection, I'm pretty sure it's on one of the 3 stacked PCB's with a thousand components. I imagine a well stocked service department (Peavey I'm sure would have) might have a spare PCB to swap out to isolate which of the 3 has the problem. However this being such an odd model, I don't think parts are laying around most shops.
As fun as it may be, I'll keep banging away on this til the owner wants it back fixed or not.

Wish me luck!
Gary

[g1]

You may need to try dampening 2 of the 3 boards at a time with something like foam or rubber to prevent vibrations through the chassis while you are chop-sticking. At least that may help you isolate which board has the fault.

[Mars Amp Repair]

Hello Voxman,
Don't forget the idea of heating & cooling the components on the board(s). Once you determine which board it is on, you can then get more specific about what section of the board has the issue & then go from the 20,000 feet perspective down to the 100 foot, etc. If you have never used freeze spray (you can just get canned air & invert the can to get the freon out), just be careful that you don't send the boards into -273 Kelvin, as many consumer components are designed to work properly at below like 0deg F. It will give you false indications.
Glen