Re: TECH: Voltage Problems - 15V2000

Hey! I resemble that remark! <grins>

-Commander Dave

----- Original Message -----
From: "Douglas Gauck" <0k64dgau@gte.net>
To: <vectorlist@synthcom.com>
Sent: Tuesday, November 12, 2002 23:21 PM
Subject: Re: VECTOR: TECH: Voltage Problems - 15V2000

> Dave,
>
> First thing I would do is to make sure it's not a G05.
>
> Couldn't resist. Good luck.
>
> -Douglas
>
>
> on 11/12/02 11:02 PM, Commander Dave at cmdr-dave@spamcop.net wrote:
>
> > Greetings all,
> >
> > Once again, I am back to working on a 15V2000 out of a BZ Cabaret. It
has a
> > voltage problem somewhere in the HV cage. The symptoms are that when
cold,
> > all is well and voltages are near nominal on all pins of the P900
connector.
> >
> > After about 20 minutes of warm-up, however, all the output voltage pins
on
> > P900 drop significantly, along with the voltage at the tube anode
(example:
> > 12.5 KV to 9.2 KV). The voltage on pin 8 of P900 (voltage to the HV
cage)
> > does not drop. The main symptom of all this is the monitor blooming (a
> > little more vertical than horizontal it seems).
> >
> > Since all the other voltages coming from the HV cage seem to be derived
from
> > the HV transformer, I am thinking (hoping) that a component is
"thermally
> > challenged" between P900 pin 8 and the HV transformer causing all the
> > voltage to drop all over (anode, P900 pin 1, 2, 4 & 5). Oh, and the
freeze
> > spray trick did not work this time on any of the components.
> >
> > I have already completed a cap kit, so ruling out those caps, I looked
at
> > resistor R900 (21 Ohm, 15 Watt) and noticed that the output was
> > significantly lower than the input (about 60% of the input). Is this
normal?
> >
> > I would like to hear suggestions on where to continue looking. I suppose
> > that the transformer itself could be bad, but would a bad HV xformer
take up
> > to 20 minutes to reach a full voltage drop? I assumed that when a HV
xformer
> > goes bad that it just goes out completely.
> >
> > Thanks for any help!
> > -Commander Dave
> >
> >
>
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Received on Tue Nov 12 21:55:26 2002