Fender Princeton 65 SS can't change between clean and lead channel w/o footswitch

[Bob2014]

Hello everybody, New here so hope you can help. I have a Fender Princeton 65 SS amp that i bought used and when first tried it all seemed good, then i tried input 2 and signal would cut out. If i moved the cord a little it would come back then go away again. Well took apart and found that there was a broken solder on one of the contacts, re soldered and all is good again. But now i notice that i can't change between clean and lead channels, i don't get any light witch is above button and it won't change if i don't have the foot switch plugged in. Everything works fine with foot switch plugged in, but since the foot switch was an optional accessory something is not right. When we were fixing the #2 input we looked over the board just to check things were ok elsewhere. We found a spot that had 2 red bulbs next to each other and when we looked at the solder on the bottom of those lights we could not tell if the solder between them was suppose to touch or not. My son was helping me and he thought they should be touching so he just melted the solder between them. I have a schematic of the chassis but i don't know how to read it, so if anybody has an idea and can help it would be appreciated greatly. Thanks

[Jazz P Bass]

"We found a spot that had 2 red bulbs next to each other and when we looked at the solder on the bottom of those lights we could not tell if the solder between them was suppose to touch or not. My son was helping me and he thought they should be touching so he just melted the solder between them."

Unsolder what was resoldered.

[52 Bill]

I don't know what you are trying to describe, but inspect the area with a magnifier and see where the copper foil traces go. That will tell you what should be soldered together and what should be separate.

My educated guess would be that the two red lamps are the light emitting diodes (leds) that are part of the distortion circuit. If by soldering something together, you have shorted something that shouldn't be, it could cause the distortion not to work or it could cause a short in the power supply.

I agree with Jazz go back in and check to see if what you soldered should be connected or not.

As for the channel switching problem, check the solder connections on the foot switch jack and also clean the foot switch jack contacts with some DeoxIt.

[g1]

The LED's sound right, they are wired in parallel but opposite polarity. So 2 legs connected at either end.
As others have mentioned, if the switching is working ok with the footswitch, then your problem is probably related to the footswitch jack. The jack has an internal switch that must close when the footswitch cable is unplugged. Dirty switch, bad solder connections, or defective jack could be the cause.

[Bob2014]

Thanks for all the help people, i will look at the internal switch and also check the foorswitch jack too. will let ya know what i find.

[Bob2014]

Got it working, Thanks for the help

It turned out to be the footswitch jack it had a broken solder joint, so it is working great again. Thanks to everyone that gave me advise.