4 Player Konami Cab Help

rikitheshadow

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Kinda new to this bit, but I got this arcade cabinet a month ago from craigslist ad. It's a 1989 4-Player Konami Cabinet. Originally for TMNT, but somewhere along the lines it was converted to Sunset Riders. I looked up Arcade Repair Tips on monitor help, but I was only able to make and solve a few adjustment issues. Adjusted brightness (on flyback too), Color pots, Contrast, and the Convergence rings! But still I'm left with one issue near the top half of the screen. The lines bend and shift.

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Its a 25" Zenith Tube with a Wells Gardener Chasis from 1986. And it appears the flyback was replaced in 06"
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Kinda hard to see the date stamp on the chasis, but reads W.G.E.C. 1986
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Chasis serial #
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Tube serial #
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Images Continued

More chasis stuff I do not know much about.
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Pic of the Zenith Tube label
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Could anyone help me with this Issue?
I've never done a cap kit. I do not own a Degaussing Wand. I've never adjusted the horizontal width coil.
 
your monitor is a Wells-Gardner K7000.

the curling issue at the top is a very common problem, and it seems to vary with different games. it's generally fixed by adjusting the 50/60 Hz pot.

now I'm no scholar on the subject, but if I'm understanding this correctly, you adjust this pot to match whatever the vertical refresh frequency is... I say this because I pulled a K7000 chassis from a Suzuka 8 Hours 2 and it had no curl effect and as soon as I ported it over to Mortal Kombat 2, it exhibits the same curling you have. lots of games run at 60 Hz vertical refresh... Mortal Kombat 2 on the other hand runs at about 53 Hz.

it's not very noticeable in-game for me, and the chassis is kind of a loaner one, so I didn't tinker with the 50/60 pot, but of course it will stick out like a sore thumb on a crosshatch pattern.

there are some games that you CANNOT adjust the curl out of, to my understanding a lot of Neo-Geo games have this problem. the solution? I don't know if one exists.

in your case though, I'm thinking maybe you should try the 50/60 Hz pot first, to see if it'll adjust out. if not, then you'll have to just live with it I suppose.

speaking of monitor tweaks, make sure your brightness is turned down enough to where you can't see the grey or brown pixels against a black background. you shouldn't see pixels in black, black should be pitch black. :) if for whatever reason you can't adjust the brightness down the way I suggest with just the brightness pot, then you'll have to slightly turn the Screen pot on the flyback down to give yourself more adjustment room.

your contrast should be turned up high enough to where you don't get any "smearing" or blooming effects (probably not the best term, blooming in monitors is something else..), it's done best on a screen with text, generally like a test mode screen... just turn the contrast up and down for comparison purposes and turn it up high enough before the smear or the letters blur bigger.

you may or may not have known this, but I figure I'll throw that out anyway.

also once you make all the brightness/contrast adjustments, then you can adjust the focus. if you can't get it to focus, then your contrast may be turned up too high, it'll create a similar effect to poor focus.

that's all. if you have any other questions feel free to PM me. there's a K7000 sticky thread, I encourage you check it out just to read about common problems and fixes.
 
Hrm, ok but I'm looking up and down on this diagram. Where would the 50/60Hz pot be located on the chasis??
 
Hrm, ok but I'm looking up and down on this diagram. Where would the 50/60Hz pot be located on the chasis??

That is an older version diagram.... look at your chassis right behind the Horizontal Position and Horizontal Hold potentiometers.
 

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I'm so blind, really didn't notice that pot back there lol.

Anyways I had a friend sit and watch to tell me what was goin on when I adjusted it, but it seemed to have no effect on those lines up top. Mostly moved the screen position up and down from what he said. And I took a look pretty much before and after....and yeah. No effect.

I'm considering trying a few other games to just see if it's just the game itself. Lol really have mostly Konami boards just like this one, but I'll try my Final Fight CPS-1 board.
 
I'm considering trying a few other games to just see if it's just the game itself.

Several games are known to cause this little curl on the K7000's, so don't go thinking it's a "bad" board or anything like that. It's just a quirk.

Sometimes playing with the brightness/contrast will help too.
 
Ok, I've determined the issue with the bending lines. It originates from the game board itself.
My CPS-1 Boards are perfectly fine, no bendy lines. I guess I just thought it was the monitor itself because I have a lot of 4-Player Konami games to play in the cabinet.

Xmen, TMNT 1 and 2, Sunset Riders, Cowboys of Moo Mesa, Crime Fighters......
 
I've had some monitor chassis (not K7000s) do the same exact thing, and it took some putzing around with the Horizontal Hold to fix it. it may or may not have any effect for you. I would think if the smart fellas on here couldn't get that curling resolved then there's really just no hope and you have to live with it. :(
 
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