bstnguy
Well-known member
Bought a couple Centipede PCBs. One worked, the other didn't. Repair is as follows (with a little nudge in the right direction from HudsonArcade):
Symptom: All moving objects stuck at bottom 1/2 inch of screen. Everything moves left to right okay and up and down within that 1/2 window. You can see mushrooms being shot in the playfield.
Repair: 74LA163 at A5 in the Motion Object Circuit (Horizontal) had pins 11, 12, 13, 14 floating. Replaced IC and game plays normal.
Symptom: All moving objects stuck at bottom 1/2 inch of screen. Everything moves left to right okay and up and down within that 1/2 window. You can see mushrooms being shot in the playfield.
Repair: 74LA163 at A5 in the Motion Object Circuit (Horizontal) had pins 11, 12, 13, 14 floating. Replaced IC and game plays normal.