31 days ago I bought a slightly used Fender Super Reverb amp. I know it was 31 days ago, because Guitar Center, the place I bought it from, told me that the 30 day warranty expired on Thursday.
Anywho, the amp comes with a pedal with two foot switches. One turns the vibrato setting on and off. The vibrato only works if the pedal is plugged in. The plug is a standard 1/4" stereo plug.
The other switch is supposed to turn the reverb on or off. Without the foot pedal plugged in, the reverb is on, but the control can be set to zero. With the foot pedal plugged in, reverb is supposed to be off or on, with the option to set the dial from 0 to 10.
The vibrato switch wouldn't turn off the vibrato, so I checked the switch and found the wiring was all messed up. I ordered a replacement switch, soldered everything up properly, and the switches work fine. Everything on the pedal and the plug works as it should.
The problem is that I can't turn off the reverb. I can have it set to 0, but I can't have it set to anything higher and then turn it off with the foot switch.
I know that various electronic devices will have circuits that are cut when a plug of some type is inserted. For example, stereos usually cut the speaker circuits when headphones are plugged in.
I'm looking at the schematics, but can't figure out where or how the reverb circuit would be interrupted by insertion of the plug and then controlled by the switch.
Any ideas where to look?
Thanks for any replies.