RE: G05 HV troubles

FYI: Mark Capps (arcadechips.com) still sells them, too.

Jon

> Date: Fri, 23 Aug 2013 09:09:51 -0700
> From: pinball@telus.net
> To: vectorlist@vectorlist.org
> Subject: Re: VECTOR: G05 HV troubles
>
> On 08/23/2013 5:16 AM, Jeffrey Matthews wrote:
> > Andrew;
> > Did you check/replace D904 leading to the anode cup?
> > I had a R901 cooking and found that to be the culprit.
> > Jeff
> >
> Indeed, the HV diode can cause all sorts of overheating problems. I see
> that they are still being made by a few people and available from a
> couple of suppliers:
>
> http://hvstuff.com/high-voltage-diodes-and-rectifiers
>
> And:
>
> http://www.americanmicrosemi.com/products/search/index.php
>
> Look for the 2CL73, 2CL74 and 2CL75
>
> John :-#)#
> >
> >
> >
> > On 8/23/2013 4:56 AM, Andrew Welburn 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..
> >>
> >
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> > chris@westnet.com
> >
>
>
> --
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> Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, VideoGames)
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>
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Received on Fri Aug 23 12:50:40 2013