Try scoping the +24 and -24 supplies to the high voltage power supply.
A lot of high frequency ripple there could indicate bad electrolytics on
the outputs of the regulators.
Joe Bachmann wrote:
>
> More problems.........
>
> I have a HV board which will not produce 19.5kv.
>
> R12 was swapped for a 1k (a Wintron was installed)
>
> It will crank up to around 18kv. I tried replacing R6 with a 4.7k so I could
> crank it further and now all I am getting is a nice ear piercing whine. If I put
> the 3.9k back, all is well. The pot is working as the HV does vary when the pot
> is turned.
>
> Any ideas?
>
> Thanks,
> Joe
>
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Received on Sun Mar 17 21:54:26 2002
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