sounds good, I'll throw together a limiter and get back to testing . i will post my findings.
Thanks

the last ones i burned up are R28-29. and U5 and a jumper that goes to ground . it seems that one side of the burnt jumper is ground and the other has -50vdc also pin 6 of U5 has -50vdc doesn't seem right to me. any help would be greatly appreciated.

try this one

got some new developments: replaced U3-- pedal worked except for the speed pot, U3 getting hot. now it's not working again

ok so i noticed something that may be the problem. jp4 "jumper" in the upper left corner the 3rd pin down has 16v on it but i believe that is going to ground, is that right?

here it is now if only someone could give me a hand figuring out whats wrong

well i guess its not U6. i just swapped it out and still have the same problem

does anyone here have any experience with the older Rocktron velocity 300 ? I bought a used one with hopes of repairing it and need a little assistance, first off when i got it it needed a transistor, i replaced that then when i powered it up to see what was going on with it it started smoking resis...

yeah they change when i hit the bypass pin 1,13 drop to 6.3v no change at 2,12

any where else i need to check? and the A+ is being fed from pin 1 of U1 which would be 18v right?

so far i checked voltage on U6 1:17.5vdc 8:17.9 2:0 9:0 3:17.5 10:17.9 4:0 11:17.9 5:17.7 12:0 6:0 13:17.9 7:0 14:0 and U5 1:17 8:17 2:0 9:17 3:0 10:0 4:17 11:17 5:0 12:0.7 6:17 13:0 7:0 14:16 the voltages shown are "i think" bypass cant tell since the led for bypass burnt out but when i h...

it was just a guess really,
i can post voltages if that will help.
how do you tell what state the inverter is in

something tells me its U5 for some reason. and now when i unplug and plug back in i get the effect but no led.
Oh .. and U1 seems to be getting awfully hot, dose that seem right

OK, changed the ribbon cable and no change, off to check voltages i guess. and im pretty sure i already checked the expression jack but ill check again.

it's something with the switching, but i don't see it on the schem.

did you ever figure out what was wrong. i am having the same problem

it's a rev. A board 1997. in the process of replacing the ribbon cables now

clean signal is fine but when you engage the effect theres no signal and the chorus/vibe led dims and if i unplug it and then plug it back in i get the effect but as soon as i hit the bypass the same thing happens again

Schematic for reference.

thanks that's just what i needed

thanks, right or wrong at least its a start