Fender Princeton Chorus problems

[clamsbodine]

Hey guys first post here. I tried searching the forums for my issue, but had no luck, so here we go.

I have a Princeton Chorus DSP. The issue I am having is when ever I have my low end EQ up past 1 the amp starts to cut in and out, almost like an oscillation and sounds distorted and "farty" for a lack of a better term. This happens both on the clean and overdrive channels. Aside from the distorted "farty" sound, I noticed that the light from the overdrive channel blinks on and off.

I always play out of the clean channel using an effects pedal.

This started happening right after my band played a show out on an Indian Reservation a few weeks back. It was an outdoor show with lots of dust and wind.


I swapped the speakers out, but still had the problem. I gave the pots and input jacks a few good cleanings and the issue is still there.


I am out ideas on how to fix this and would greatly appreciate any pointers on troubleshooting this down.


Thanks in advance,
C.

[Jazz P Bass]

Overdrive LED

Is the OD channel selected when the LED blinks or are you on the clean channel & it blinks?
Here is the schematic.
There are some good test voltages on the schematic.
Specifically the LED on/off voltages.

[clamsbodine]

I usually only use the clean channel.

[Jazz P Bass]

U10

Can you check the voltages around U10?
Print out the schematic & write down the voltages that you aquire, right next to the ones on the print. All around U10.
Use a blue pen, it will stand out better.
I would think that the OD LED would light if it maybe found ground.
The schematic shows -13Vdc to turn it on.
There is alot of stuff hanging off the LED side of U10.
Do you have a scope?

[clamsbodine]

I do not have a scope. Just my multi meter. I will print out the schematic and do the testing after the holiday.
Thanks again for the quick response.