After finally (2 months in!) discovering that there was another fuse - cleverly hidden by the Game Plan designers under the playfield rather than where all the other fuses were:
Only to discover it blows immediately when powered on.
Then spending all night carefully unsoldering each and every coil (and diode) and testing them all good.
Finally turning it back on (with all of the coils still unconnected) and the fuse blowing AGAIN!
I posted my results and Viperrwk calmly pointed out that there was one more coil.
Down in the cabinet, underneath the ball that rolls back and forth to prevent tipping the cabinet, there is a coil that fires when the match happens - that big "knock on wood" sound you hear when you are lucky enough to get a free play.
I located the coil and unsoldered it. It does not test as good as the others (2.8 ohm instead of 5.5 or 8)
With ALL the coils now disconnected, I put a new fuse in....crossed my fingers...and turned it on.
The fuse did NOT blow!
woohoo, real progress at last.
Of course it could be that it isn't blowing because there was now nothing at all on the circuit. So I connected three coils, crossed my fingers and tried again.
the fuse did not blow!
and, the coils worked. In diagnostic mode they fire one after another and each one I had reconnected worked just fine.
It appears I have real success. I may be able to put it back together and start playing it!
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