I'm having some problems. The monitor image starts out screwed up when the machine is turned on, and "heals" as it warms up, but not completely. Here's an initial image, with the alignment grid:
After it warms up, it looks like this (scrolled a bit to make it easier to see):
Here are the technical details: WG K7000 monitor, bought refurbed from WG. It had this problem from the beginning, but I couldn't bear to send it back. Anyway, I installed a cap kit. No change. The situation hasn't changed in the years since, so I figure whatever it is, is stable.
Capkit was likely the following:
Mazzco Kit Wells Gardner K7000 Series Monitor C10 33u 25V C11 22u 25V C12 1u 50V C13 22u 25V C18 1u 50V C20 10u 50V C21 10u 50V C22 1u 50V C23 47u 25V C40 2200u 35V C42 1000u 16V C45 470u 16V C46 470u 16V C48 100u 35V C50 1000u 25V C56 22u 160V C57 47u 200V
Update: I've been told that this is an instance of Horizontal Tear, and I should check/replace C29, C30, C31, and R70. Thanks to Wacko172 for that.
Further update: I've finally replaced C29, C30, and C31 with no change. Haven't gotten to R70. Here's a close-up of the board, with these three caps circled.
Most recently, two people suggested replacing C51. I've got to find a decent supplier for this. "Decent supplier" means one who doesn't charge several times the cost of the device for shipping.
Likely final update: I've given up on this monitor. It's been sitting on my workbench for 2 years, being chewed on by my cats. I don't know if the tube still holds vacuum. At this point, I'm looking for a real video repair place to evaluate it and fix it or dispose of it.
Oh, by the way, here are the switch settings for Mappy. I did that up a while ago to answer a question in RGVAC and it would be a shame to lose it.
Also, to answer any likely questions, the machine is located in Massachusetts, it's not for sale, and I'm told this cabinet, though not the monitor or PCBs, which I added to the cabinet, started life in Massachusetts' Walpole State prison. I'd like to hear from the person who placed this particular game at a prison. I find the idea twisted, but amusing. (smile)
Last modified 23 March 2009