Vertical Hold issue Wells 4600 19"

arcades4ever

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I have a Wells 4600 in an Atari Crystal Castles upright.

The monitor was rebuilt about a year ago and I am not sure what was serviced.
It has had about 20 hour use since then.

Anyway I had the game on the other night and it started to scroll after about an hour of being on.
I could not adjust anything to stop and lock it, just slow it down.

Can someone please direct toward what may need repair or replacement?


Thank you in advance.
 
personally if you don't know what was done i would recap it and also replace C621 (axial paper cap) and do a complete reflow of solder.

your problem i would start with checking the value of the hold pot and make sure it tests okay.
 
First thing to do would be to make sure the daughter boards are all firmly seated and locked in place with the plastic retainer bar. Those things can come loose easily and make all kinds of strange things happen.
 
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