M.A.P. (Modular Audio Products) 3100 EQ Schematics?

[robertloud]

Hello there,

I have a pair of MAP 3100 EQ modules and one of them doesn’t pass audio. I’m curious if anyone here happens to have schematics I could use to help troubleshoot.

Interesting side note: you’ll notice the module on the left never got its red silkscreen layer! Ironically this is the one that functions

I’ve started to trace them out but figured I’d ask here in case.

Thanks!

 

[mjrippe]

Have you tried swapping the opamps?

 

[pucho812]

awfully close to 550/550A-1 with single opamp.
Most common culprit on such things is the doa. As MJrippe said, did you swap the opamps to see if it follows?

 

[robertloud]

Have you tried swapping the opamps?

Thanks for the replies. I did try swapping the existing MAP op amp with another that I thought was known to be working, but now that I think of it, I have a better setup for testing DOAs now than I did at the time and it would be worth double checking. I'll start from there!