Mesa Nomad 100/ questions

I'm repairing a Mesa Nomad 100 Combo. By far the most complicated I've worked on so far..It has several bad pops and crackles going on. The footswitch seems to not be working alos and that is my question. I know it has the ch select 1,2,3,ftstch knob on the back, but when set to footswitch the footswith does not work for channel select. What pins control what functions so I can figure out if it is need of a new multi pin cable and not something internal.

Are you trying to repair your own amp, or ar you doing this as a job for a fee?

If you are an authorized Mesa repair shop you should be able to get the necessary documentation from Mesa.

I am repairing amps now for a shop. I am not mesa authorized yet. I ran sound this past friday for a friend and this is his amp. I'll have to call Mesa. Have schematic for it already. I just do not have the pedal schmatic, It will just intermitinly jump from channel to channel on its own. it started clicking its own thing in my troubleshoot play around last night, just like while he was on stage friday.

Good luck to you.