I like my Game Plan games, but getting to the test points isn't nearly as convenient as they are on the Bally games. So today, I took out the whole transformer assembly and made a simple jig to power it up on the bench.
I took a lamp cord and put a .093 female connector on each wire.
Then plugged each connector end onto the male connectors coming of the transformer.
Put an alligator clip between the black lead of your meter and the ground clip on the rectifier board. Plug in the test cord and you have power to the transformer and easy access to all the test points.
Test point values are:
TP2 - 5V
TP3 - 7V
TP4 - 24V
The top of fuse #1 can be used for the AC test point at 6.3VAC.