I have always had an issue on my Rampage that I would describe as a jittery, jumpy, or flickering in the vertical direction. It seems like it jumps up and down by maybe a scan line, at a fairly high frequency, and it does it all the time. I tried to record a video with my phone, but the condition is not visible when recorded. I have a K4900 in there now, but the problem also existed with the previous monitor.
I had assumed it was 60 Hz AC getting in through the hacked-in switcher. I was able to find a broken original switcher, repair it, un-hack and re-pin the harness, and reinstall. The problem was identical. The monitor had already been recapped, but I replaced the big filter cap just for good measure (no change). I also checked B+ (right on at 129.9V).
Next I eliminated environmental factors. I unhooked the marquee, turned off all the other machines and lights, and put Rampage on it's own circuit. Same damn thing. So then I remember that Spy Hunter also does this, and Tron too. I thought maybe it was and MCR thing, but now I'm thinking it's a Midway thing. But not so fast, Ms. Pac is rock solid. So what the hell's going on?
The only thing that I've found is that Tron, Spy Hunter, and Rampage all run at 30 Hz refresh rate. Everything else I have (that works) runs at 60 Hz, and looks terrific. So, to finally reach my question, is the flicker from the 30 Hz refresh, and if so, can I do anything about it?
EDIT: It is an MCR thing. Rampage is MCR monoboard.
I had assumed it was 60 Hz AC getting in through the hacked-in switcher. I was able to find a broken original switcher, repair it, un-hack and re-pin the harness, and reinstall. The problem was identical. The monitor had already been recapped, but I replaced the big filter cap just for good measure (no change). I also checked B+ (right on at 129.9V).
Next I eliminated environmental factors. I unhooked the marquee, turned off all the other machines and lights, and put Rampage on it's own circuit. Same damn thing. So then I remember that Spy Hunter also does this, and Tron too. I thought maybe it was and MCR thing, but now I'm thinking it's a Midway thing. But not so fast, Ms. Pac is rock solid. So what the hell's going on?
The only thing that I've found is that Tron, Spy Hunter, and Rampage all run at 30 Hz refresh rate. Everything else I have (that works) runs at 60 Hz, and looks terrific. So, to finally reach my question, is the flicker from the 30 Hz refresh, and if so, can I do anything about it?
EDIT: It is an MCR thing. Rampage is MCR monoboard.
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