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If the SPACELAB lights don't light when they should, inspect and diagnose the circuit I posted above, with Alligator clip jumper wires
http://www.planetimming.com/Pinball/troubleshooting/EM%20Troubleshooting.pdf
http://www.pinrepair.com/em/index3.htm#features
Quoted from StotzBotz:Here is what I believe is the Advance Unit mounted to the underside of the playfield
At the risk of being a wiseacre, that label is pretty conclusive.
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