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Main => Monitor/Video Forum => Topic started by: karimn on August 21, 2009, 09:36:47 am

Title: Need help with Wells Gardner k7000 and k4600
Post by: karimn on August 21, 2009, 09:36:47 am

Ok so I have two monitors that are having issues.

First the k7000 - when I plug the power source in and just the power source, the screen is green and there are raster lines that go all across the screen. When I plug in the PCB into the monitor ports you can see the images it's just that everything is green. I have literally replaced everything under the sun. New cap kit, new IC1, new transistors on both the neck board and the main board for the color green. However it's still not working it's still green with raster lines. Is it a flyback issue?

For the k4600 - the screen is not filling in entirely. It is fine vertically but width wise it is not filling in. I figure it's a capicotr issue but I don't know which ones to replace.

If anyone can help me out with these that would be great. Thanks guys.

Title: Re: Need help with Wells Gardner k7000 and k4600
Post by: Ken Layton on August 21, 2009, 12:09:29 pm

K7000:

Did you turn down the "screen" control on the flyback? Did you test the two green adjustment trimpots on the neckboard? Did you test the picture tube on a rejuvenator?

K4600:

Did you adjust the width coil?

Title: Re: Need help with Wells Gardner k7000 and k4600
Post by: karimn on August 21, 2009, 12:30:32 pm

K7000

yea screen control doesn't seem to be helping. I tried adusting the green knobs but nothing changes, the red knobs work but the green ones don't. How do I test the picture tube rejuvenator?

K4600

the width coil BROKE OFF! No freakin joke, i tried to adjust it and it just totally broke off.

Title: Re: Need help with Wells Gardner k7000 and k4600
Post by: Kevin Mullins on August 21, 2009, 01:43:24 pm

Quote from: karimn on August 21, 2009, 12:30:32 pm

yea screen control doesn't seem to be helping. I tried adusting the green knobs but nothing changes, the red knobs work but the green ones don't.

Sounds like the green gun in the tube may be shorted.

Quote from: karimn on August 21, 2009, 12:30:32 pm

How do I test the picture tube rejuvenator?

You test the tube WITH a crt tester/rejuvinator.

Example:

Title: Re: Need help with Wells Gardner k7000 and k4600
Post by: Ken Layton on August 21, 2009, 01:44:21 pm

Lately there's been a spate of bad trimpots on the k7000 neckboard. You may have to unsolder the two pots for the green to test them.

If you remove the two green control trimpots and the green driver transistor on the neck board and power up the monitor without those parts there should be no green in the picture at all.

If there is, then you have a tube problem.

Title: Re: Need help with Wells Gardner k7000 and k4600
Post by: SirPeale on January 15, 2010, 01:28:31 pm

Older post, but I was wondering about the width issue myself.  It's shrunken about  an inch and a half on each side.

Title: Re: Need help with Wells Gardner k7000 and k4600
Post by: SirPeale on January 18, 2010, 11:01:07 am

Aside from adjusting the width coil, is there a cap I can re-spec to widen things out?

Title: Re: Need help with Wells Gardner k7000 and k4600
Post by: southmonitor on January 24, 2010, 09:55:33 pm

Normally not enogh size issues are caused by low B+, due to bad caps on the power supply.