Stress tester repair help needed

[K `Sleep]

I have listed this in all of the arcade related groups, but maybe a arcade
repair person lurks in this group.
Acquired a Stress Tester, and it doesn't work. Anyone have schematics, or
any idea how to calibrate this unit (has several trimpots and a test mode)
Thanks
http://server6.theimagehosting.com/image.php?img=xxxx.8e1.jpg

 

[Mike Berger]

That's much newer than the ones I've worked on -- which had model A
ignition coils and a rheostat. I'd expect a multivibrator circuit
driving a coil with something to variably limit the voltage.