K7000 and K4600 blowing line fuse

vadimred13

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Hey guys, I've been having some trouble getting a monitor working with my cocktail Pac-Man machine. It seems as soon as I plug the power connector to the monitor and turn the machine on - I blow the line fuse. I've tried 2 different monitors - the 4600 (which I know for sure is working, because I pulled it out of a friend's upright Pac-Man) and the 7000 (not sure if it works, but looks to be in very good condition).

The 4600 sits kind of weird in the machine because it's got this thin metal bezel that goes on the outside of the tube...I'm not sure if this has anything to do with it or not(the original G07 did not have this configuration). While testing the 7000, I've kept it out of the machine, but I've connected the ground from the machine to the chassis of the monitor, so I think that should be ok.

Any ideas on where I should start troubleshooting? Thanks!
 
Does it blow the fuse without the monitor connected?

There are two fuses next to each other - the monitor fuse and the line fuse. I'd expect the monitor fuse to blow first if it's a monitor issue...
 
Has the plug on the line cord been replaced? I've seen this happen when the plug is replaced and the HOT and earth ground wires reversed.

Edward
 
Thanks for the responses guys.

modessitt:
No, it doesn't blow the fuse without the monitor connected, only when I connect the monitor power.

ELutz:
The plug is the same one from the original (or at least I think it's the original) G07 monitor. I had no issues powering or blowing fuses with the G07 (I had picture issues with the G07, which is why I'm replacing it). The plug on the line cord is not fitted to go in one way; it fits in both ways. I've tried plugging it in both ways, and the fuse blows with either orientation.
 
Measure the voltage at the power connector to the monitor to see what you're getting...
 
The voltage at the power connector of the monitor reads 128-129V. I have noticed something really strange, though. When I blow a fuse, if I flip the monitor power connector around - it will sometimes work. Then the next time the fuse blows, I can flip it around again and it seems to work. This doesn't make any sense. Swapping the hot and ground pins should not ever work, but it sometimes does.
 
The voltage at the power connector of the monitor reads 128-129V. I have noticed something really strange, though. When I blow a fuse, if I flip the monitor power connector around - it will sometimes work. Then the next time the fuse blows, I can flip it around again and it seems to work. This doesn't make any sense. Swapping the hot and ground pins should not ever work, but it sometimes does.

How are you flipping the connector around? The molex should only fit one way.

What kind of fuse are you using? You need to have a slow-blow in there, or it'll be liable to blow when the degauss kicks in.

-Ian
 
The molex fits in both ways. My old monitor's power connector was molded to go in one way only, but this new K7000 has a connector that will allow either orientation.

The fuses that I've been using have been 1.5A fast acting fuses. That might be my issue. I'll have to try some slow blow fuses and see if it makes a difference.
 
The fuses that I've been using have been 1.5A fast acting fuses. That might be my issue. I'll have to try some slow blow fuses and see if it makes a difference.

That is likely the majority of your issue. IIRC it even states on the PCB slo-blo fuse.
 
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