Monitor Voltage...

philt80

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So I purchased a junk cab in the hopes that it's monitor would be a good donor for my Ms Pacman cab. Upon first testing the monitor with it's own board it occasionally displayed properly, but I was most often presented with this:
DSC00515.jpg


I assume it to be a horizontal sync issue and a few here suggested I order a cap kit....
The cap kit should arrive tomorrow, but I am confused looking at the schematics.
On the sanwa PM1718(donor monitor), it shows an iso voltage going into the monitor at "100 Volts". The Ms Pac iso transformer pushes somewhere around 120V. Does this mean the monitor can only run with the 100v iso transformer as per the schematics?

For reference...
Boomer Rangr Manual showing the power supply setup and monitor schematics:
http://www.crazykong.com/manuals/BoomerRangr.man.pdf

and the Ms Pacman manual for comparison:
http://www.crazykong.com/manuals/MsPacMan.man.pdf
 
Also if someone could kindly point me to the proper section of those schematics for the Horizontal Sync I would greatly appreciate it....as I can then trace any other possible probs if the cap kit fails to fix it.
 
Anyone know if a 120v iso transformer will work on this monitor whose schematics call for 100v???
 
That problem could be caused by a cold solder joint. I would try pulling the chasis and touching up solder..esp on things that get stressed like connector pins. When it did display a pic did the color look ok?
 
Anyone know if a 120v iso transformer will work on this monitor whose schematics call for 100v???

Typically.... if a monitor calls for a 100v isolation transformer then you do NOT want to apply 120v to it. Without knowing exactly what the monitor specs are and it's tolerances I would use the original 100v isolation transformer.

As for the scrambled pic... try adjusting the Horizontal Hold.
 
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