Wells-Gardner K4900 vertical overlap problem?

callanbrown

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Hi everyone,

My K4900 is acting strange. With a few different boards I get the same result. The picture is stable but vertically everything is misplaced, looks like the top and bottom halves are both overlapping in the middle.

I've tried adjusting all my vert pots and nothing seems to get rid of the overlap.

pEi2Kl.jpg
 
4900's have tons of vertical deflection problems. They do what yours is doing, or collapse, etc.

Get out your soldering iron, and resolder everything in the back left corner of the board... you'll see two heat sinks that look kind of funky with a transistor attached to each. that's the vertical ic's.... all that stuff is known to stress and crack the solder joints loose. Look really really closely at everything back there (it's got a box around it on the bottom of the board) and check the edge of the board very carefully to see if the clip that holds it to the frame has cracked the board.
 
I've done no mixing of my own, and when I got the cab it was working fine.

Although, I do have a tiny suspicion I saw vertical foldover (is that not the tell-tale sign of the mismatch when there is a thin bright edge along the top?) that I thought could be adjusted out.
 
verticle

do a cap replacement in the vert. section.
 
Did you ever figure this out? I'm having a similar problem. Already put a cap kit in and reflowed all the solder joints.
 
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