I'm not familiar with the mechanics of swapping a V2000 EHT into a G05, but I know that the V2000 operates at 14.5kV while the G05 only uses 12kV. Could that be causing more current to be drawn through Q901 / R901?
On Aug 23, 2013, at 1:56 AM, Andrew Welburn <andy@andysarcade.net> wrote:
> hi all..
>
> I've been fighting with a HV box from hell recently, and i've held off posting to vectorlist until i was really stuck. I'm at that point now.
>
> Its a G05-802...
>
> Right now, R901 is smoking up. I'm only getting 7.2kv at the anode, and the HV adjust pot does not change the hv. I can only have it running for 10 seconds before R901 really starts to cook off.
>
> The flyback was actually bad, as the HV was bouncing around from nothing up to 7kv very erratically before, so i swapped that from a known-good v2000 hv box. Now i get a steady HV, albeit low and r901 still burning up. (R901 was cooked crispy before the flyback swap anyway)
>
> I have subsequently swapped _every_ diode and transistors in the box, and it still acts the same, no improvements. I also changed the electrolytics, and the HV adjust pot itself (R905).
>
> Can anyone think of a scenario that would let R901 burn up? any pointers as to where i should be looking harder?
>
> thanks..
>
> --
> Andrew Welburn
> http://www.andys-arcade.com
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Received on Fri Aug 23 22:55:26 2013
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