On 22/03/2016 21:14, Top Cat wrote:
I hope someone can help me.

I have an extremely old CRT attached to a Space Invaders B&W arcade cabinet.. There is no available schematic, that I can find. The flyback has died but there is no modern replacement, mainly because the documentation for the historical model is non existent. So I dont know the input or output voltages, I have no circuit diagram, and I cannot find anything to determine what its input/output parameters can be. I do have the old flyback, I know the monitor size, and I have the actual circuit.

The model is marked as "Toei GM-140 TV MONITOR". It was produced around 1979; or from 1976 onwards.

My question is this: Can one retro/reverse engineer or somehow determine what modern equivalent could replace a flyback in this circumstance. Is this possible?

Cheers in advance.


Is it purely for the raster, or LV supplies also. 1970s presumably just
the former, so half a chance of near enough any LOPT of that time would
do with a bit of jiggery-pokery.
I've never looked inside a LOPT, are they epoxy filled of that era or
still tar filled of the 60s era? Is the bakelite casing likely to
contain asbestos fibre reinforcement if you hacked in to the casing, to
check out the possibility of a rewind, at least "B&W" only voltages?