Quoted from Netnissen:However, I still don't understand the "strange" voltage of 0,4. I would Imagen 0V if traces are interrupted.
There is a via under C2 on the power side, the dielectric in a capacitor is corrosive and will break this transition from the top of the board connected to the regulator, and the bottom of the board connected to the fuse.
Its possible some connection is still available through the corroded copper, but not enough to push any current; if you just want to experiment to answer the why on the .4 voltage, remove the fuse and see what your unloaded voltage measures at the holder; also, take a resistance reading between the + output from Q2 and the fuse.
In reality you will be replacing C2 to fix this and will likely be stitching the playfield as well. Any darkening of the board, or a mysterious yellow/orange gel by C2 is a dead giveaway.
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Richfield, MI
