Fender Pro 185 Footswitch / Reverb Problem

[ErnieBall1046]

Hi, I've got a Fender Pro 185 combo. I've picked up a secondhand 3 button footswitch but when I plug in the f/s, the boost and channel change buttons work, but it cuts the reverb out and the switch has no effect.

I've looked in the f/s and it has a series of diodes. I've checked for dry joints and it's all ok.

Does anyone have a schematic or any ideas as to how I can get the reverb going?

Thanks

[Jam]

Footswicth

Dumb question did you clean both of the jacks?

[ErnieBall1046]

Now sorted

... my eyesight isn't as good as my soldering.
I went over all the joints with an iron this morning and it's now sorted. The jack plug had indeed needed a good clean too.