Larodde
Quoted from barakandl:Logic probe the MPU J5 plug.
I agree with Barakandl.
Then ..take a look to :
http://www.techdose.com/projects/Stern-Pinball-SB100-Sound-Board/346/page3.html
(Topic ID: 133621)
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Ho ,
Did you try to use a AT-PC Power supply to have your 5, and 12V without machines ?
I used this method to fix my bally MPU.
Build a circuit with a fuse-holder (used in cars) , find an old pC power supply and work stand alone.
I would change the capacitors due to low cost, and the zener diodes.
Don't remember how to do to check the Zeners
I had this case on system1 power supply . The zener diodes short cut, and the voltage wasn't right.
Just my idea.
Lionel
http://www.techdose.com/projects/Stern-Pinball-SB100-Sound-Board/346/page2.html
In fact i don't understand because they are two circuits . One by J1 (TP1) , one by j2 and regulator (TP6)
@Barakandl - an idea ?
"Tomorrow I pull one leg of C1 and see if that's my problem, else it's U1' --> right 
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