I am looking for a owners manual for my "carvin pro bass 500" bass amp head carvin was no help anyone has one or can get a copy to me?? thank you Robert

http://www.peavey.com/support/searchmanuals/
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Fender Guitar and Bass Amplifiers Owner Manuals and Schematics Hard Copy...
Service Manual free download schematics datasheets eeprom bins pcb repair...
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I had a short at one of the electrolytic capacitors at the EQ board. Check the voltages!

Conseguiste el diagrama ?

probably bad transistors in switching power supply

I found both FDA2828N50F MOSFET transistors in the power supply were shorted. I replaced them and the amp worked fine. I couldn't find a reason for them to fail.

If it's still under warranty, get it replaced. Otherwise, take to an authorized behringer repair shop, or your local pro-audio repair shop.

Mixing brands on footswitches, even within the same brand but different series is NEVER a good idea. While many can be converted by elecvtronics competent techs, the effort is usually not worth it for anything other than the simplest footswitch.

does your bass have active pick ups?
do the ratings on your amp match the ratings on your speaker?
are you using a pedal?
does your pedal have an output adjustment?
have the ground on your bass checked.
make sure you're using the right kind of cable.
and be sure that the outlet you're using is grounded.

See if this might be what you are looking for:

http://elektrotanya.com/ashdown_abm500.pdf/download.html

This is a foreign site and I am not sure if the ABM500 matches your unit.