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I bought an old IGT Keno machine SG-411p  MFG 5/84.  It's in really good shape.  The screen goes off color blue and has the diagonal lines running across it.  Sometimes it flashes back to black.  It's still usable but I was looking for some troubleshooting advice.  Does anyone know where you can buy a manual?  I know it's pretty old so I'm not expecting a whole lot.  Thanks a lot.

Just a little update:  I found where the problem is.  The 1st video interface board on the monitor has gone intermittent.  If I tap on it or push it sideways with a screwdriver the monitor turns to normal.   It must have a broken solder joint.   I am a computer tech, so I'll haul the monitor into my shop tomorrow for further investigation.

Solder joints repaired.

I can't tell if this is an IGT PE or older but it does look like a PE model.

The program on the screen is the same as my PE+ running the keno chipset.

This would make the monitor a Centronix 1401
If you go to their website they have a $45 dollar repair program.
You send it in and they send it back. Age does not matter.

It's working good now, but I'm certainly going to keep that one in mind if the monitor goes blue again.  It was a lot of work desoldering that card with the broken traces.  Then we made a trace out of solid core wire and soldered it in place.  I tried the circuit writer pen from RadioShack first, but that just burned up as soon as the CRT was turned on. Thanks for the info.

That's a nice classic machine.
Glad to hear you troubleshot the problem and got it done!