Convergence & Purity

[DavidsGames]

Ok is there a place that describes both of these as well as how to adjust them?

I got my friggen monitor working, but the colors are not lined up on top of each other.  I do NOT have a pattern generator, so can these by eyeballed for a rough matchup?  My friend is so "by the book" that he won't even attempt it "OH GOD NO YOU CAN'T DO IT!"  ROFL damn we're not watching HDTV for God's sake.. so can it be done?  More importantly, can it be done by a novice, and how?

[grantspain]

is this a digital monitor or analogue,if its digital usually there is a reset for purity-if its analogue then you have to adjust the yoke rings-most yokes have a factory set adjustment(usually they have a paint line that can be lined up)otherwise you need to set up each colour one by starting with green and use a grid pattern(most boards have this grid pattern in monitor test)-its not a difficult job just time consuming(difficult is setting up the convergence on a mitsubishi rear projector),whats the history of this monitor?is this the same monitor that had the width problem?

[Ken Layton]

Remember that the rings affect how the colors line up in the center of the picture. The yoke affects the outer edges of the picture. Convergence adjustments are detailed in the Wells-Gardner monitor manual for the 4600, 4900, and k7000 series monitors.

[Chris]

Ken, I'm having a similar issue, and please pardon my ignorance... but you talk about adjusting the "rings" and adjusting the "yoke" and I thought they were the same thing...

I have a Wells-Gardner D9100, which is actually an SVGA monitor on an open chassis.  When I first got it at my office it was razor-sharp, but after I got it home I had convergence issues on the right side, more in the upper right, so I figured I must have jarred it as I moved it or something.  But I'm afraid to toch anything in there for fear of getting zapped and dying, or worse, knocking the picture even farther out of adjustment...

[DavidsGames]

Grantspain, yes this is the same monitor.  Well, it's a replacemen actually, but the same model.  I had to dismount the crt from the frame to mount it in the frame (anyone have a spare vertical mount frame?), to make it fit in the cabinet.

I saw the paint on the rings, but was unsure about randomly moving them, or trying to move them into place.

And yes it is an analog monitor.  I'll see if I can digup (download) a monitor manual too.  So, can they be adjusted on the fly, w/o a generator?  LOL

[grantspain]

i think you may have disturbed the purity rings when you moved the crt,the very back ring is a lock ring to stop the rest moving make sure this is loose before you line up the paint marks(it turns a half turn to be loose-and then reverse to lock),remember all the paint marks must line up across the whole yoke

[Chris]

Does the monitor need to be discharged before adjusting these rings, or is that safe?

[tetsu96]

Does the monitor need to be discharged before adjusting these rings, or is that safe?

It's usually a good idea to discharge if you're working on monitor electronics...

...but as the monitor needs to be on for you to see what you're doing, I think you may be safe skipping that.  You might make things easier setting up a mirror too.  Depends how good you want your convergence to be, but it's a lot of back and forth with the rings until it looks right.

And if nobody mentioned it, lots of games have a pattern during the boot sequence.  If you MAME'd a cab, pause there.  If not, then perhaps a service mode will let you keep it on until you're gold.

[grantspain]

a message for chris,don't mess with your purity rings as i think your fault is more likely a degauss issue-best to post a pic first

[SirPeale]

It's usually a good idea to discharge if you're working on monitor electronics...

...but as the monitor needs to be on for you to see what you're doing, I think you may be safe skipping that.

Considering that as soon as he turns on the monitor he'll charge it back up again, I'd say that's a 'yeah.'

You'll need a mirror to do it right. 

[Chris]

a message for chris,don't mess with your purity rings as i think your fault is more likely a degauss issue-best to post a pic first

Wow it's hard to get a pic of a monitor problem!

In the attached pic, the lines and characters are 1 pixel across at 800x600.  The portion to the left of the green line is what the screen looks like from the left edge to a little past halfway, and about an inch or so on the far right.  The portion between these two looks more like the part on the left side of the line.  It's hard to see, but the pixels look "split" like they're not aligned with the shadow mask.  Text in this area gets pretty blurry and unreadable.

[SirPeale]

This is likely because you're using a resolution that just won't look good on this monitor.  I do see a *hint* of convergence issues, but IMNSHO not enough to tackle.

How do *games* look?

[Chris]

This is likely because you're using a resolution that just won't look good on this monitor.  I do see a *hint* of convergence issues, but IMNSHO not enough to tackle.

How do *games* look?

As you'd expect... low-resolution classics are fine.  Vector games, high resolution PC things like Visual Pinball, and text-dependent things like a jukebox suffer.

I don't think it's a resolution that won't look good, as it looked perfectly fine when it arrived at my office... it was only after I re-boxed it, moved it home, and mounted it in the cabinet that it showed up.

[SirPeale]

Maybe the yoke got cocked just slightly.  With the machine off, see if it's loose.  If it is, push it in.

[Rickn]

It is hard to psot on the forum, but I will be glad to send anyone on request some basics on this.

Trust me as a past production engineer (Electrohome), Quality/engineering mangager (Mitsubishi).......

I am more than happy to help

Rick@Niemandisplays.com