WG-K7000 Sync/pincushion Problem?

[thekenoh]

I have what I believe is a Wells Gardner 25" K7000 chassis (says P538 on the board, and has the optional pincushion board that bards sing songs of from time to time) on a Samsung A68KVL74X tube on a DDR machine I purchased. After experiencing some problems that included this vertical throbbing when certain lights or graphics would display, and a very bad pincushion problem, I sent it out for repair. After hooking it all back up the same way it came, I was met with this for a display:



I was advised to adjust the H and V Holds to try and get it straightened out, and this is about as "good" as I got it:



In either event, the pincushion is still there as well as no longer really having a useable picture. I have the feeling that this chassis is totally inappropriate for this tube anyway, as the tube is 29", but I'd like to have an idea of what's going on with this chassis so I can just sell it to help fund a Wei-Ya trisync to go in there or even actually get it working. Thanks!

[grantspain]

surely the original chassis was a sanwa pm1745 if thats a euromix 2 machine-therefore the k7000 chassis is well out of spec for the tube
you would need to read the inductance of the horizontal yoke winding,k7000 is around 0.900 mh whereas an original sanwa pm1745 is 0.300mh
if this is the case you would serious geometry issues and i am surprised the deflection circuit has not packed up

[MonMotha]

US and Japanese DDR machines (identical aside from a step-down transformer in the US ones - rather rare) would originally have had a Toshiba D29CR55 aka PB6643 (chassis model) in them.  These have Mitsubishi tubes.  These monitors are actually pretty quality and are dual res (switchable).  These cabinets can be identified by their 3/4" plywood construction and equal size over/under coin doors.

Korean DDR machines had a Hong Eun monitor in them.  I don't remember the tube, but Samsung sounds right.  These cabinets can be identified by their 1/2" MDF construction and coin vault that's taller than the mech/operator access area.  I'm guessing this is what you have.

You've likely had a K7000 chassis slapped on the tube/yoke from the Hong Eun.  Indeed, it's probably a mismatch.  Unfortunately, I know way more about the Toshiba monitor than the Hong Eun.

The Hong Eun monitors weren't very good anyway, so at least you're not missing much.  Chassis was crap and the tubes OK at best.  That's probably why it's been replaced.  You may do well to just replace the whole thing or at least find a better matched tube/yoke.   You may be able to find a monitor ripped out of a DDR with e.g. roasted tube that you can steal the chassis from, but again, they're not very good.

I don't know what the Euromix cabinets came with.  I've never seen one state-side, so I've never had the opportunity inspect them.

If you've got a European region cabinet, grant's your man in terms of info.  I don't know a thing about 'em aside from the game hardware itself, and the stage design is probably identical (Konami appears to have provided those to their regional manufacturers).

[thekenoh]

@MonMotha - That's spot on, I have one of the Korean machines whose chassis I'm sure bit the dust long before I ever got ahold of it. I'm not terribly in the market for an entire monitor replacement right now, so I've ordered a Wei-ya C3129A to replace it. I have as of yet to completely verify that the K7000 is alright, as I don't have another tube to hook it up to, but it's good to affirm my suspicions that this chassis just doesn't belong in there at all, it certainly explains a lot.