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Referring to the schematic I posted from IPDB...but I wonder, since it's different from the one MarkG posted...so this may not be right, but worth looking at...
1) The # 1 bumper can activate the 100 point relay IF the ace relay is activated (otherwise it scores 10 points) Same for bumpers 2-5 and king-10. Check that a pop bumper scoring switch is not always closed. Push the pop bumper ring up and down on the bumpers and see if any switches always stay closed. All this assumes that I had the right schematic to start with.
2) my second idea was the advance relay.
3) Recheck the 100 point DU (drum unit) EOS switch, sticking? something touching when it shouldn't?
4. Check the 10 point DU 9th position switch and see if it's stuck closed.
Good luck with it - wish I could get my hands on the game! Henry
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