303 voltage too high

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05-Aug-2019 09:51 PM

SteveP

SteveP

Posts: 1

I've just fitted the upgrade kit to my 303 boards but can't drop the voltage between pins 1 & 9 to 67v. I've put back in the original trimmer and have the same 70ish volts showing when it's backed down fully, 90ish at the other end of adjustment.
I'd really welcome some advice.
Thanks
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28-Aug-2019 12:13 PM

Stefaan

Stefaan

Posts: 613


Check the voltage regulation circuit around RV100 / R110 / R111 / R130. There should be around 6,5V on top of R111 - see the schematic.

Stefaan


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