Re: Low HV on Dim WG6100

Not a good idea to muck around adjusting HV without a HV probe. You
don't want to run the risk of soft x-rays (around 30KV isn't it?)
being emitted out the rear of the tube. the front of the tube has 1"
of lead glass so the viewer is safe enough...they are cheap enough on
eBay.

Start with checking the capacitors, do any look overheated? I use the
plastic film coverage as an indicator of impending capacitor failure.
If the film does not cover 33% of the top of the capacitor then that
capacitor is suspect and should be replaced. If you look closely you
can see the shadow of the original film on failing capacitors - time
to replace!

Then check input B+ from the inside of the HV unit (to get around bad
connections). Is it correct? Bad connections?

It is very unlikely that the HV transformer is failing, they go
catastrophically, not gradually. Blurp, or bang, or crack!

John :-#)#

At 10:03 AM -0700 8/12/06, Malcolm Mackenzie wrote:
>I've been wondering for a while why my Space Duel had a dim monitor,
>and while I had it out to test a Tempest I finally checked the HV.
>I don't have an HV Probe so I checked the B+ voltage at the
>connector on the HV board. It read 145 volts. I understand that
>it should be in the neighborhood of 181, so I turned the pot and got
>it up to 162.5 volts, but it wouldn't go any higher. I checked the
>monitor and it seems a bit brighter, but still too dim. Any
>thoughts on what might be limiting my HV? -Malcolm

-- 
John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9
Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, VideoGames)
                  www.flippers.com
"Old pinballers never die, they just flip out"
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