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 OS-2 with no effect output
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paisleyfender
Bronze Member

Germany
70 Posts

Posted - 11/04/2009 :  18:37:27  Show Profile  Reply with Quote
I just bought a used OS-2, where the seller stated that "a capacitor" broke off the PCB, and if this cap would be replaced, the pedal would probably work again.
OK, I located the polarity protection diode to be burnt away, and replaced it.
The pedal of course did not work afterwards.
There's sound in bypass mode, but nothing comes through with the effect engaged.
The LED lights up normally.
Then I replaced the DIL 1458 op amp, without success.
Now what should I do next? There's another 8 pin in line op amp, which could also be burnt. What op amp can I use here (the type is hard to read when it's in place)?
Or should I replace any other component?

Edited by - paisleyfender on 11/06/2009 21:04:28

Laurie
Double Platinum Member

Canada
4854 Posts

Posted - 11/06/2009 :  21:59:59  Show Profile  Visit Laurie's Homepage  Reply with Quote
it might be the second opamp - sounds like it was reverse voltaged, which opamps hate (to quote Dr.Bob). It is a M5218AL.
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