Quoted from dddanielll:Can someone with a Stars or MPU-100 game send a few closeups of the MPU connectors? Having a lot of trouble tracing down some gremlins on mine. One coil not firing at all. Some coils misfiring intermittently. Checked schematics but none seem to have wiring colors for the MPU connectors specifically.
Your MPU is called out as A4 on the drawing.
Your switches are all on connector J2.
A4-J2-1 = MPU-connector J2- pin #1 which is a white-red wire (W-R)
A4-J2-2 is Brown-White wire.
pin #3 is W-Blu
Pin #4 is W-Y
Pin #5 is Y-R
Pin #8 is BRN
Pin #9 is grey
And so on.
This is your switch matrix.
Screen Shot 2022-05-21 at 9.29.58 PM (resized).jpg
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Your solenoids are on the SDU. The SDU is called out as A3.
Your rectifier board is A2
The BLU-W wire that powers your flippers is A2-J1-6.
Left sling shot is A3-J5-8 that is a Red-Black R-B wire.
Right sling shot is A3-J5-14 that is a Black-Yellow B-Y wire.
I have found that sometimes Stern did not use a color called on the print. One wire on my Big Game is called out as Purple-Black and what is there is purple-white. There are 4 wires on my Big Game that do not match the print. I have the issue with the Quicksilver I am building. My thoughts are that Stern ran out of a particular color of wire and instead of shutting the line down so Stern substituted with wire it did have in stock.
This is your solenoid matrix
Screen Shot 2022-05-21 at 9.30.30 PM (resized).jpg
All of your colors are listed
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Here is your lamp wiring. All colors are listed on the left side.
Screen Shot 2022-05-21 at 9.57.50 PM (resized).jpg