Mesa King Controller

[GainFreak]

Hi,

I need to do some repairs on a King Controller. I found Roadking II schematic in the net but nothing about the footswitch there.
Thanks in advance.

[soundguruman]

Besides tracing the continuity of the wires, the condition of the LEDs and the operation of the switches, the footswitch is integrated with FETs inside the amplifier. If you have a bad FET, it could make you think that the problem is the footswitch, when it's not the problem.
There are several updates for these amplifiers, some of which are being done by service centers for free. Don't expect help from Mesa.

[GainFreak]

I don't expect help from Mesa although there are rumors that sometimes they would send a schematic if requested.
The guy said everything on the amp is working so I have the pedal only here.

[soundguruman]

The guy is assuming that the amp is OK, but there is at least a 50% chance it's not.
And while you are inside that roadking, check to see if the DC filament rectifier for the preamp tubes is overheating. Just a thought.