GO7 Powering/Iso transformer question?

F14 Tomcat

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Hello, could someone please let me know if it's normal to have higher voltage coming out from an isolation transformer (than what is read at the electrical outlet)?
Meaning that my wall outlet reads out 123v and the molex connector (that monitor plugs into)
reads 134v??
My monitor shut off during gameplay the other day, it won't come back on and there is no neck glow. Could the 134v going to the monitor have blown something?? Is that too high?
The monitor is plugged directly into the iso transformer, which is plugged directly into my wall outlet (as I have a separate power supply for the board only).

Any advice would be appreciated.
Thank you
 
Most of the old iso's had voltage selectable lugs due to different voltages available throughout the country. If you had 90vac coming in from the wall, it bumped up the output to run the monitor, if you had 120vac coming in from the wall it bumped the output to run the monitor down.

I highly doubt that is what has caused your problem.

What game is this?
 
It's normal for a transformer to read a little higher if there is no/little load on it. Chances are, your monitor has a blown flyback - the number one cause of G07's just going dead. Look at the little fuse on the monitor chassis - if it's blown, you need a flyback, HOT, and of course the fuse. If the monitor has a blown fuse, then it won't put much of a load on the isolation transformer, and it will appear to be high.

But yeah, it's normal for the voltage coming out of the ISO to be slightly different - higher or lower.

-Ian
 
Iso possibly bad??

Is there anyway that this isolation transformer has malfunctioned? Do they short out or burn out??
I will try hook up another monitor if I can find one that works, but is there any way I can tell that the iso transformer is doing it's job, providing isolation???? If that makes any sense at all.

The monitor is a G07 CBO from a joust cabinet and the iso transformer, power cord, wiring out is from an exidy venture game.

Thank you for all the help.
 
Yes, it is causing isolation - if it is an isolation transformer. Whether or not the 134 is causing a problem depends on whether the monitor likes it or not. If it's been working for a while like this, then it's probably not the problem.

More info is needed: Has this G07 been rebuilt withing the past year? if so, what kind of rebuild was done?
 
but is there any way I can tell that the iso transformer is doing it's job, providing isolation

Check continuity between the input lugs and the output lugs.
There should be NO continuity.

I have seen many "brand new" isolation transformers output around 134v from a 120v source.
Like mentioned earlier, you should really check it with a full load on it.
But if your monitor is not working, then there is no load.

Sounds to me like your monitor just died.... it happens.
Common enough model to be easily repaired though.
 
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