wells gardner 4900 color running

[rfr341]

Hi, I have a tiger hekli arcade game with a monitor which is using a wells gardner 4900 chassis. When the game is on in the left top corner it looks like the color in that area is bleeding. The rest of the screen is fine but the one corner the colors looked smugde. Is the a cap problem?

[SirPeale]

You need to manually degauss your tube.

[rfr341]

Thanks for the response, how do I manually degauss the tube?

[modessitt]

To degauss your tube, you would need a tube degausser.  It is a large black ring that emits an electromagnetic field that resets the pixelation in your tube.  However I don't think that is your problem.

Degaussing problems usually show as discoloration, not bleeding.

I would suggest that you adjust your contrast down if it seems to bleed all the colors.  Unfortunately, the K4900 doesn't have a pot labeled for contrast, but adjusting the black level pot on the chassis or the brightness pot on the flyback can alter it. 

If it's just one color, find the drive pot on the neckboard for the color that's bleeding and turn it down until the color is back within its borders.  Be aware that the neckboard has two pots for both red and green, so adjust the drive pot for either first then the color pot to balance the color.

Does the screen have any burn-in?  Sometimes when a picture is drawn on a tube with bad burn-in, you will notice areas where the picture looks funny.  Unfortunately, there sin't anything you can do about this except to change out the tube.

If this doesn't work, post a pic of the problem.

PS:  Top left corner?  Curl perhaps?  Now that's a different problem altogether and should be addressed with a cap kit, which is a good idea anyway if it hasn't been done in a while.

Whew!