Re: Tempest K6100 - intermittent HV problem

John,

The install manual details the HV shutdown adjustment and how to determine
if it's applicable (not hard to tell, once you see the difference).

It also explains why you shouldn't depend on the B+ to adjust the anode
voltage.
When it fails, check that you have your low voltage supply (the +13v one in
the HV cage, not the LV-2000 one).

Also check that the oscillator is running (at the first stage). Be careful
going farther towards the flyback, as there are obviously dangerous voltages
there (we hope).

The ~24V is just the DC input going through the primary of the FBT. The
B+ circuit is kind of in an auto-transformer configuration. If the
oscillator isn't running, you'll see the 24V output.

-Mark
On Wed, May 12, 2010 at 10:06 PM, John Huie <jehuie@sbcglobal.net> wrote:

> Wow, I didn't know that. Yes I did adjust it. Well, I don't have a HV
> probe but I adjusted the B+ to be 180 volts. And interestingly, if I
> monitor the voltage it slowly climbs...very slowly. But if I leave it on
> for a long time it will climb to around 184 volts and stay there. But it
> still plays fine when that happens.
>
> The times when it doesn't work, the voltage just comes on way low and stays
> there (24 volts or something like that). So it doesn't really sound like
> over-voltage protection to me. But that's an interesting fact to tuck away
> for future reference!
>
> --- On *Wed, 5/12/10, Christopher X. Candreva <chris@westnet.com>* wrote:
>
>
> From: Christopher X. Candreva <chris@westnet.com>
> Subject: Re: VECTOR: Tempest K6100 - intermittent HV problem
> To: vectorlist@vectorlist.org
> Date: Wednesday, May 12, 2010, 7:59 PM
>
>
> On Wed, 12 May 2010, John Huie wrote:
>
> > When it's playing blind I have deflection chatter. Spot killer is off.
> But...my B+ has dropped from 180
> > back down to 24 volts. Which is right where it was before I "fixed" it by
> replacing the zeners. I can
> > replace them again. They are about 25 cents each so no big deal.
> But....not sure if that would help and
> > even if it does something else seems to be wrong since these are brand
> new.
>
> You may be running borderline on the HV. I believe the K6100 has an
> over-voltage proteciton circuit that chuts down the monitor if the HV is
> too
> high.
>
> Did you adjust the high voltage after the rebuild ?
>
> ==========================================================
> Chris Candreva -- chris_at_westnet.com<http://mc/compose?to=chris@westnet.com>-- (914) 948-3162
> WestNet Internet Services of Westchester
> http://www.westnet.com/
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Received on Thu May 13 00:02:26 2010