More on the fine art of degaussing
I have learned from Ken Layton via the BYOAC Monitor Forum Thread that my light spot may be due to a magneized monitor frame. His suggestions to remedy that including next steps are included below:
Ken Layton -
Two possibilities on the discoloration:
1) The metal frame of the monitor has become magnetized (just keep degaussing with the manual degausser once or twice a day for several days). Remember that a degausser is an intermittent duty device. No more than two minutes on and then at least 30 minutes off before using it again or else you'll burn it up.
2) The yoke has slid back from the 'bell' of the picture tube slightly or the purity ring assembly has lost some of it's magnetic strength.
My Reply -
Will do on the degaussing routine.
On the bell slipping, is there a way to confirm/discount that?
Re: The purity rings, if that is the case I assume nothing can be done short of replacing the yoke correct?
Ken Layton -
In regards to the yoke slipping away from the picture tube's bell, loosen the yoke clamping screw and try pushing it forward toward the 'bell'. Warning: You'll have to do it while the power is on! High voltage present! Wear leather gloves and have a helper watch the picture as you move the yoke. This is easiest to adjust when the game is in a monitor test pattern screen displaying a solid red screen.
In regards to the purity/convergence rings: you don't replace or even fool with the yoke when this assembly goes bad. The purity rings are made of a ceramic magnet which can lose magnetism over time or someone may have bumped/moved the adjustment tabs on it.
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Be sure to check out the the Rescue Tron! Project Thread and the Monitor Repair Thread at ArcadeControls.com
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Ken Layton -
Two possibilities on the discoloration:
1) The metal frame of the monitor has become magnetized (just keep degaussing with the manual degausser once or twice a day for several days). Remember that a degausser is an intermittent duty device. No more than two minutes on and then at least 30 minutes off before using it again or else you'll burn it up.
2) The yoke has slid back from the 'bell' of the picture tube slightly or the purity ring assembly has lost some of it's magnetic strength.
My Reply -
Will do on the degaussing routine.
On the bell slipping, is there a way to confirm/discount that?
Re: The purity rings, if that is the case I assume nothing can be done short of replacing the yoke correct?
Ken Layton -
In regards to the yoke slipping away from the picture tube's bell, loosen the yoke clamping screw and try pushing it forward toward the 'bell'. Warning: You'll have to do it while the power is on! High voltage present! Wear leather gloves and have a helper watch the picture as you move the yoke. This is easiest to adjust when the game is in a monitor test pattern screen displaying a solid red screen.
In regards to the purity/convergence rings: you don't replace or even fool with the yoke when this assembly goes bad. The purity rings are made of a ceramic magnet which can lose magnetism over time or someone may have bumped/moved the adjustment tabs on it.
----------------------------------------------------------------------------------------------------------------
Be sure to check out the the Rescue Tron! Project Thread and the Monitor Repair Thread at ArcadeControls.com
----------------------------------------------------------------------------------------------------------------
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