A3.2 and B2.1 in the manual show you the pinouts of that jack and the expected signal, unfortunately section 6.1 schematics and sec D timing diagrams seem to be missing. You’re going to need to find a suitable driver circuit. Without looking at the timing it might accept input from an old MDA adaptor or similar.

https://en.wikipedia.org/wiki/IBM_Monochrome_Display_Adapter

Edit: While this in behind a paywall it looks like this old article has a circuit for composite to TTL monochrome that would be what is needed.

https://www.elektormagazine.com/magazine/elektor-198812/47485

This one is from the 1980s itself and there also seem to be a lot of TTL to composite circuits out there that use fairly modern (and a lot fewer) components so with a bit of looking you might find a modern composite to TTL driver circuit. Look at the retro computer and retro arcade game forums, etc.

I don’t know anything about EDM, but since it has to produce very high voltage high current pulses (enough to make plasma in a dielectric tank) and very quickly , the power supply is probably specifically designed for the machine.

The service manual says they were made for an F55 video terminal. 1980s video terminals had video driver boards in them to convert the TTY signals to video. That driver board varied wildly on the output signals, some would output composite video leaving the monitor to control the raster scan, sync, horizontal & vertical sweeps but some would output all of that and there would be minimal circuits in the monitor cage. Hopefully you have ones that take composite video. can you get pictures of the back and sides?

Also, as others have said BE CAREFUL! the crt itself is actually a really big capacitor that can store a lot of potential and deliver a high voltage zap long after it is unplugged. While it’s running the fly back circuit produces 1KV (1000 volts) or more so I say again BE CAREFUL.

It’s a “safety capacitor” used across AC, similar to a Y cap, they have a known failure mode that is designed to not cause fire.

https://www.allaboutcircuits.com/technical-articles/safety-capacitor-class-x-and-class-y-capacitors/

Honestly this is not worth the risk, It looks like a simple enough repair a high watt resister a cap and possibly an IC (U1 looks burnt) BUT consider this, something happened to cause the failure and that something could still be around, like a short in the heating element of the throw. Whoever designed this obviously did not test the failure mode of the device. The reason things are UL rated (other certs for non US) is that they get tested and found to not fail in a manor that will cause harm to the user or fire. The failure mode of this device could cause a fire, if you repair it and the same thing happens. . . . Don’t risk it, Toss it out.

ALSO NOTE! if you do attempt it. That cap is most likely a class X2 cap and would need to be replaced with the same, don’t use just any cap!

^^^^^This^^^^

Hey, it actually worked and took less the a couple of min.

I have one, going to try and tape it off from the other components heat it up and see if that works.

Yes, The 5v regulator is the same and it is outputting 5.01v under load and 5.12v no load. Not sure why the first went bad but I’m guessing the POS 5v reg sent a spike on the 5v rail when it went bad and that damaged the TLV75733. The Teensy acts exactly the same connected to a USB unmounted from the board. It boots, runs for a min while the TLV heats up then the 3v3 drops and the Teensy crashes.

Do beeper services even exist anymore? I would think they all got displaced by cell phones long ago.

No beeper in this photo. Could be a piezoelectric disk hidden some where they are small and thin. what’s on the other side of the PCB? Also look stuck to the plastic, piezos are often stuck to the casing to use it as a sounding board.

Edit: not sure what the yellow thing, cap maybe, can you get a better picture of the text on it ?

2

yep, here is the DigiKey link

https://www.digikey.com/en/products/detail/panasonic-electronic-components/ECK-TBC102MEM/282045

@jarrodsfarrell This is out of production but you can use this link to get the package size and form factor to search for a replacement.

I work in IT and users will get upset if you give them the “Please put in a ticket” line. So for the people that might grumble at this stance but there is good reasons for it in addition to not clogging up this community it’s good for QA. I’m new to Lemmy so not sure if the SAs and Devs frequent !lemmy_support@lemmy.ml but I suspect they do and driving support questions to a common spot will help analyze need for new features, UI changes, bug fixes, etc.

Just my 2 cents but I like your stance.