Vintage Synth Repair

Hi, Fran,


you were absolutely right, it was that opamp. Now new one sits in the  
socket and everything works :-)


Your band looks well! I wish you lot of gigs and fans!


Daniel Forro






On Jan 15, 2016, at 10:32 AM, narfman96@... [vintagesynthrepair]  
wrote:


>
>
> Hi Daniel,
>
> I would replace the bad LM3900 if you are certain the output is  
> stuck at 7 volts. Compare the outputs to the other LFO's. Pin 5 is  
> output 1, pin 4 is output 2, pin 9 is output 3, and pin 10 is output  
> 4. If you can find the offending output voltage stuck at 7 volts you  
> have the bad chip. Everything downstream will be 7 volts too. This  
> is what a tech that works on op amps all the time would call stuck  
> at the rails (power supply voltage).
>
> HTH,  Fran
>
> P.S.  I did not send that other email. Sorry I never replied. We've  
> been busy learning new material plus I've been out booking more  
> gigs. Added some 90's tunes for the millennium crowd.....  The Alibi  
> Band
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