K4600

beeman8

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Has anyone seen this issue with a welsgardner 4600 I've tried 2 xy boards dose the same thing tested the yoke seems to test fine xy boards yes fine in another 4600
 

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It's not the xy board I can put the xy board in another monitor works fine
Then it's the X/Y board headers themselves on the chassis. Reflow them. Reflowing should be removing the solder, checking the pad for oxidation and adding fresh solder. Use a fiberglass pen. Also, give the headers themselves on the parts side a once over with the fiberglass pen, those might be oxidized as well.

The issue you described is indicative of those transistors on the X/Y board. If it works in another chassis then the chassis is your problem. And it could be the connections to the cards (very common on K4600).

Good Luck!

Del
 
Then it's the X/Y board headers themselves on the chassis. Reflow them. Reflowing should be removing the solder, checking the pad for oxidation and adding fresh solder. Use a fiberglass pen. Also, give the headers themselves on the parts side a once over with the fiberglass pen, those might be oxidized as well.

The issue you described is indicative of those transistors on the X/Y board. If it works in another chassis then the chassis is your problem. And it could be the connections to the cards (very common on K4600).

Good Luck!

Del
my earliest K4600 jobs (circa 10 years ago) didn't go very swimmingly with just adding solder to the header pins. in addition I did that process wrong: you want the cards still installed or else the heat will make the pins fall out a bit and they'll sit uneven. I don't totally take the header pin strips out, I don't know if I noted on my site that I work the pins odds and evens (the boards have them conveniently numbered) so that way nothing theoretically will move around.

the monitor from my Defender years ago had intermittent vertical collapse (it started doing this when it was featured in a show for a month) and it wound up being the pots needed to be resoldered on the XY card. if you do all of these things and still have vertical collapse then you'll need to replace the vertical transistors on the heatsinks. from my own past experience working in the dark depths of where I do now I mixed up the green and blue yoke wires and the XY card didn't appreciate it very much. so always pay attention to the B G Y R (I think that's the order) labels on the yoke tabs.

taking them apart is a fun little journey: https://www.arcaderepair.net/servicing-the-wells-gardner-k4600/
my K4600 page: https://www.arcaderepair.net/wells-gardner-k4600/
 
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