Re: G05_802 Glowing Blob in middle of screen ?

From: MyPearl <mypearl_at_dds.nl>
Date: Fri Sep 03 2004 - 21:05:22 EDT

It might not be the same problem exactly, but if you have the older G05-801
Vector monitor, you might have bad pot's on the HV supply.
I had to replace both the contrast and brightness pots to get the monitor to
work really good.

Mendel

----- Original Message -----
From: "Colin Davies" <colin.w.davies@btopenworld.com>
To: <vectorlist@vectorlist.org>
Sent: Saturday, September 04, 2004 1:02 AM
Subject: VECTOR: G05_802 Glowing Blob in middle of screen ?

> Hi Guys... Just joined this list because I've aquired an Asteroids Cab...
>
> I'm Based in the UK near Liverpool and have a reasonable bit of
electronics
> / tech background.
>
> To start the ball rolling, I'm currently having a problem with the
monitor
> and hoping someone can help me please.
>
> 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.
>
> Thanks for reading,
> Regards, Colin
>
>
> --------------------------------------------------------------------------
-
> ** Unsubscribe, subscribe, or view the archives at
http://www.vectorlist.org
> ** Please direct other questions, comments, or problems to
chris@westnet.com

---------------------------------------------------------------------------
** Unsubscribe, subscribe, or view the archives at http://www.vectorlist.org
** Please direct other questions, comments, or problems to chris@westnet.com
Received on Fri Sep 3 21:05:26 2004

This archive was generated by hypermail 2.1.8 : Fri Sep 03 2004 - 23:50:00 EDT