Problem switching channels on Mark IV

[rgx612a]

I just got my Mark IV out of the pawn shop, It was in there for at least 6 months. So now my amp is stuck on channel one, it bumps up in volume when i switch to rythym 2 but that is it...it does nothing when switching to channel 3 and does nothing with the footswitch. I'm stumped???

 

[Markedman]

Did you check the big dial in back and set it right?

 

[rgx612a]

Did you check the big dial in back and set it right?

Yes I did. I even opened it up to see if I could see anything wrong but i'm not very good with electronics. I was thinking about maybe spraying some contact cleaner on that wheel thing that the channel switching dial is connected to??

 

[Markedman]

Make sure you use deoxit 5. It is the only thing to use, anything else will ruin the potentiometer.

 

[bjones7296]

Any luck on this I just purchased a Mark IV combo myself in the last week I received it today in the mail, I am having the same Issue.

 

[bjones7296]

Never mind I figured out my own issue. It might have helped to not have it on auto RHY 1 lol, well this is my first amp tube amp. so learning experience.

 

[rgx612a]

Never mind I figured out my own issue. It might have helped to not have it on auto RHY 1 lol, well this is my first amp tube amp. so learning experience.

This was the exact problem I had. All is well now. I feel so dumb for not figuring that out right away.