R-Type wiring diagram – Adding older monitor without isolation transformer

I am trying to make sense of how to wire up a spare monitor to my R-Type, so I can keep my Vision Pro before I sell the machine. The vision pro is a nice new monitor, and it also has an isolation transformer built onto the chassis. In the diagram below I have drawn what I already have, and how I am hoping to attach another monitor.

Bob Roberts said this in two emails;

First Email –

You need a 1:1 isolation xformer to run your monitor. The pic you have is of power entrance with an auxiliary outlet & a switcher.

I don’t know if there are different versions of isolation transformers, and if the most common ones are 1:1, but right now, I am assuming the most common transformer is 1:1.

Second Email –

No… you can’t tie in to the AC in feed. You have to have the 1:1 output isolated & there is only one place with 2 terminals to hook that up to without regard to polarity since AC has none.

In the first email I thought I described that I would put an isolation transformer directly off the power supply, and then from the transformer I would run my two power lines. But knowing how crappy some of my emails are sometimes, I must not have done a good job explaining which is my bad.

His second email I take away that I need to have some sort of polarity based voltages, and AC doesn’t have that. Like, I would need +120V and -120V, and this is just +120V directly to the monitor.

It’s a gift that Bob even responded to my emails with an explanation, he sells parts, he isn’t a tech support guy or something. So again, a big thanks out to Bob Roberts and his big heart for helping the lowly collectors trying to figure things out.

I don’t understand the polarity part, so I am posting to the klov group to see if they can help me and explain it a different way.

Here are some similar arcade posts

• Photos of Sega Pengo Isolation Transformer
• Installed a switcher in the Pengo
• Some days I hate arcade games
• Putting WG4700 Series monitor in R-Type
• Finally time to sell the R-Type

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