Re: Monitor degaussing help wanted

You might have a problem with convergence. That could cause your problem.

Jon

At 01:58 PM 7/24/2000 -0400, you wrote:
>I have a Wells Gardner K7200 monitor that is brand new, but 7 years old. I
>picked it up a few weeks ago at a flea market. I powered it up, but was
>disappointed to see that the picture was covered by a whole wavy rainbow of
>colors. My first guess was that the monitor needs to be manually degaussed,
>given the amount of the distortion. I have a degaussing coil from Happ
>Controls, and used that the degauss the monitor. I used the procedure
>outlined by Randy Fromm.
>
>Here's Randy's description:
>"Whether it's storebought, salvaged, jury-rigged or homemade, the method of
>using your coil to degauss a picture tube is the same. The CRT can be
>degaussed with the monitor on or off. I like to have it on so I can see the
>results right away. Besides, it's neat to see how the powerful magnetic
>field of the degaussing coil distorts the picture. Start at the center of
>the CRT. Hold the momentary switch closed while moving the degaussing coil
>in a spiral across the screen. When the spiral extends well beyond the edge
>of the picture tube, move it away from the CRT, turn the coil at a 90 degree
>angle and release the momentary switch to turn off the coil. Turning the
>coil at the end is simply a precautionary measure to assure that the
>magnetic field of the degaussing coil doesn't have any effect on the CRT at
>the moment the coil is shut off. In practice, I don't find it to be
>necessary. Likewise I have found that degaussing the front of the picture
>tube is generally all that is necessary; "The Book" says you also should
>degauss the sides and top of the CRT and chassis."
>
>Unfortunately, when I plugged the monitor back in, it looked just as bad as
>it had before. My degaussing procedure seemed to have had no effect. So,
>here are my questions... given my brief description of the display
>characteristics, was I correct to diagnose this as a degaussing issue? If
>it's something else, have any idea what it is? If this is still a
>degaussing issue, are there any tips for improving my technique?
>
>Specifically, how long should I take to degauss the monitor? 1 minute?
>Should I make rapid spirals around the monitor face or slow paced ones? I
>was holding the coil so that the "O" was parallel to the face of the screen.
>That is, the monitor is facing horizontally on my workbench, and the "O" was
>being held straight up and down. Is that correct?
>
>If degaussing doesn't fix the problem, what do I check next?
>
>Thanks for your help,
>Joel-
>
>
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Received on Mon Jul 24 15:03:46 2000