Marshall MG100HDFX Footswitch control circuit problem

[Duncandod]

Hi. The 2 button footswitch tested fine, and button 1 works to switch from clean to OD channel. Button 2 does not switch from OD1 to OD2. The switch on the amp works fine, but there seems to be something wrong in the FS_C circuit.

Does anyone have any experience with this problem, that they could point me in the right direction? Thanks.

[Jazz P Bass]

According to the HDFX manual, the 2 button footswitch will change Channels and turn the DFX On/OFF.

[Duncandod]

So it does...and that's what the button does do, upon inspection, lol.

The pedal buttons are labeled Clean/Overdrive and OD1/OD2. Must be from a different amp. Wow, do I feel dumb :/ Thanks for the info!

[Jazz P Bass]

Not dumb, misinformed.

That footswitch is for the Valvestate line of amps.

[g1]

That's a PED802 footswitch for some valvestates & DSL's. As you know, it will work fine, just the labelling is wrong.

[Duncandod]

I had identified the pedal as a PED802 and checked the wiring against the schematic. I also busted the amp open and checked connectivity through to the main board.

What I didn't do, as Jazz pointed out with great subtlety, was check the manual or suspect that the pedal was from a different unit.

Thanks again guys. Hopefully my next contribution here will be a little more interesting for you

[soundguruman]

I had identified the pedal as a PED802 and checked the wiring against the schematic. I also busted the amp open and checked connectivity through to the main board.

What I didn't do, as Jazz pointed out with great subtlety, was check the manual or suspect that the pedal was from a different unit.

Thanks again guys. Hopefully my next contribution here will be a little more interesting for you

Pedal from different unit...
Bad foot switch cable...
Happens all he time.
Check all your facts and model numbers first.
Don't assume anything, verify instead.