Yes those monitors did blow out at times if the filter on the fan got clogged for a while and not cleaned. Mine is the original with no problems. You can hook up an old monochrome monitor that uses an RCA pin plug and have it work fine.
I thought I had a bad monitor once, Wifey had cleaned the machine and turned the contrast down till nothing showed. On the right side of the machine in a little cutout are a few things, including a start jack to use a foot switch to start the machine on multiple repeat jobs, and a small plastic shaft that is the contrast control. Clockwise is more contrast. When you get the unit give that a try before attaching the external monitor.
P.S. I have a set of schematics for the Wizard XL.

Philadelphia, PA (Really Bensalem)
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