Peavey KB-60 problem

[hondabones]

I was given this amp quite awhile ago. Channel 1 inputs weren't working. Around the time I received the amp I also started going to school for electronics. At the time I didn't see anything wrong with it. I now have some electronics knowledge in my brain and have pulled it out to have another look at it. I found numerous cracked solder joints (especially on channel 1) I fixed those and still no sound when I plug into the inputs of channel 1. I also noticed loud popping and cracks coming from the speaker when I turn some of the pots. Any suggestions? Even with school I am still lacking experience, so bare with me. Many thanks.

[Jazz P Bass]

Welcome to the world of Fun.
I have attached the schematic.
Follow the signal path from the input & see just where it stops.
The crackling pots is a common enough problem.
They get dirty, sticky. They need to be cleaned/ lubed.
DeOxit is a good electronic cleaner.
Spray in a SMALL amount & rotate the pot knob back & forth.
It is made by Caig.
The big distributors carry it. Mouser, Allied Electronic, Digikey, MCM.
It is not cheap.
$25.00 a can.
I have even seen it at Radio Shack.They carry it in a much smaller dispenser.
For what it is worth, having the main board out, I would touch up the solder on the whole board.
Of coarse, I am a nit picker.

[hondabones]

Thank You! I can't see any attachments though. That's O.K. I already have the schematic. I did what you said (I should have already known this, lol) I found two broken solder traces. No voltage was getting to R119. The trace right beside it (C108 to R118) is also broken. I haven't jumped the traces yet. When I do I'll let you know what happens. Undoubtedly this is the problem.

I already re-flowed a bunch of solder (I had the same thoughts as you) if I get ambitious I will do the rest.

I will look into cleaning the pots.

There is a 50k pot in the equalizer section (VR102) that has the shaft broken and the knob missing. I found a replacement online for $4.95. If anyone knows a good place to find these cheaper that would be great. I will have to contact Peavey for the knob.

Once I get this all done the amp will be like new.

Thanks.

[Enzo]

Peavevy will sell you any part for their amplifiers, CALL the parts department there.

Do you have the pot part number? Should be on the schematic. Pots have a number format like 71190543, or just 7119xxxx, look on the old part. SOmetimes it just has the last three numbers, so 71190543 becomes #543.

And if you have the complete schematic, it includes a parts list.

[hondabones]

One of my professors gave the schematic. I don't have the parts list your talking about. The pot did have a number (71190511) on the PCB layout sheet he gave me. That's how I found the replacement pot. I will contact Peavey and see what I can get.

Thanks for the reply.

[Jazz P Bass]

[QUOTE=I can't see any attachments though. ]
OOps! For those who may be following this I have attached the schematic above.

[/QUOTE= I will have to contact Peavey for the knob.]
Peavey has zero stock.
I have tried.
Your best bet is maybe EBay.
I have seen groups of them from time to time.

[hondabones]

Well I probably won't be able to find the right knob I have that will work though

[hondabones]

The scope shows everything work good now. I will plug in the speaker and see what's up. Thanks to you all!