e-licktronic Forum

HELP Needed MC OH/HH /Cymbal real quiet:(

They work but you can barley hear them from the master out. Same for the solo outs. And i checked the last few resistors in the signal path there the correct value..

And its not the ribbon cable..

swapped opamp u3 no luck... Is there a way to measure the opamps?

The oscliators work...

measured all the transistors for continuity, looks good.

When i scope R172 ( the last R of CH) the signal it there, but real quiet

The rest of the sounds are fine. And the 130mv on the noise is there


And yes i searched whole the forum

Thanks!

you could check the actual supply rails to those opamps, but they're probably fine
did you check the resistors on the IO board? they are used as passive mixing, so they set the actual mixing gains

the signal around there is probably gonna be weak, so you could check if there's something maybe pulling the weak signal towards ground or the supply rails...
when power is off, measure the resistance from ground (or from +15, or from -15) to a given point - if it's very big - it's probably okay, but if it's low.. or very low then there could be something wrong (but this is best done by also looking at the schematic)

Thanks for the reply.

Got this fixed today

The resistors to ground from u3 where 560k instead of 560r.