Re: G05-801 Tech

Found my old problem in the Archive....

I'd forgotten that the Glowing Dot disapears on the High Score Entry... Is your problem the same ?

Does indeed seem to be a combination of a tired tube and an asteroids board !!!

Cheers, Colin

####### From the Archive a few years ago #######

 I'm getting a glowing blob in the middle of the screen with the controls
set up to give a fairly nice picture.

 I've done a 'mock up' picture of what I'm seeing here...
 http://uk.geocities.com/colin.w.davies@btopenworld.com/Astyblob.jpg

 I've just set up the HV to about 11.5 Kv ( it was 12.7), I need to
 measure/check other voltages yet (its a bit hard to work on at the moment).

 With the game board powered down.. I still get this 'blob' , and the spot
 killer is illuminated. I've also tried another deflection board, and have
 the same problem. I have tried adjusting the brightness and contrast...
with
 the brightness right down, the blob is still faintly visable but obviously
I
 would have to play the game blind, If I turn the brightness past normal
 levels, the blob becomes a sharp dot / spot like the your ships bullet.

 When I play the game, the blob is always in the middle, BUT when I go to
 high score name entry.. the blob dissapears like magic and then reapears on
 the next 'game screen'....

 I'm puzzled about this as this is the first Vector I've worked on.. Its
been
 suggested that the tube may need rejuvenating, but I can get a nice bright
 picture, whats the syptoms of a bad tube ? I've not got another monitor or
 tube to try and do a swap test.

 There is a dot of screen burn in the middle, but its been suggested that
this is a symptom of my problem (when its been turned up) and not the cause.

If any one can shed any light on this please, I would be very grateful.

###################End of Archive#################################################
  ----- Original Message -----
  From: COLIN DAVIES
  To: vectorlist@vectorlist.org
  Sent: Friday, May 01, 2009 10:47 AM
  Subject: Re: VECTOR: G05-801 Tech

        I have had this on a G05-802 too, and there is an old post here with a sketch of what I'm seeing... Let me guess... Asteroids ?

        I tried different deflection boards (and I think I swapped the HV unit too) - My theory is that its an old tube, you have to adjust the controls 'up' to give a picture, the beam sits in the middle for a while after drawing, and there is just enough power still getting through to make it glow in the middle...

        On another note....Are repro HV transformers available yet for the 802/805 - I see arcade shop has them for the 19v2000 and I thought that they were very similar devices... (Cinelabs ??)

        Regards, Colin

        --- On Fri, 1/5/09, utahtaper <utahtaper@comcast.net> wrote:

          From: utahtaper <utahtaper@comcast.net>
          Subject: VECTOR: G05-801 Tech
          To: vectorlist@vectorlist.org
          Date: Friday, 1 May, 2009, 3:50 AM

          I'm debugging an 801. Monitor has been capped and bottlecaps replaced. The monitor fully works however there is always a dot right in the middle of the screen(Like a spot killer dot) not a bright dot, but a dot none the less. The dot is even still there when the brightness and contrast are turned all the way down. Never ran across this one before. Anyone seen this before and have some suggestions?
          The dot is also there when the game turns off and slowly disappears as the voltage in the tube drops. Or if I bleed it off myself with my probe.
          Thanks in advance!
          Jason

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Received on Fri May 1 13:50:33 2009