Hi chuckwurt
IF (if, if) nothing else helps: We may talk about "what I did to my Shangri La". Cleaning switches and setting to High Tap did not help --- but cheating - making the bumpers to run on DC did help - the bumper-action changed from "lame" to "lively".
Your Dipsy Doodle runs the bumpers (as Shangri La) on AC. See the first JPG --- on top the wiring on rather modern Williams - ONE rectifier in the modern pin and the wiring "DC to all the bumpers".
I did NOT want to "heavy alter" the wiring in my pin - so I choosed the solution "ONE rectifier for ONE bumper" - so I made me four rectifiers (for the four bumpers in the Shangri La). In the lower part of the first JPG I show the solution on "Top Center Jet Bumper" --- see "my green dots" and "my red dots". I CUT the two wires to the Coil - mounted male and female plugs on each side (I can plug them together on both sides and have the bumper "on AC as before" --- but I sneaked-in my rectifier. See the second JPG - playfield lifted --- hanging on the wires / plugs: The ONE rectifier for the ONE Bumper.
Again - if nothing else helps: We may talk about "changing each bumper on its own to DC". Greetings Rolf
0Shangri-La-Bumper-DC-Work-EN (resized).jpg
0Shangri-La-Bumper-Work-01 (resized).jpg