Hi, Bought a dead Flipper Parade late last year. (Photo below shows playfield before any work.) Got it going (thanks to Pinside). I've been cleaning it up. Removed and rebuilt the pop bumpers (needed access to playfield areas underneath, and the yokes were broken.) Five pops - two red, two yellow, and one centre white. Re-fitted them to playfield (with wires/plugs added to the lamp holders, to make future removal possible without desoldering/soldering). Tried the game with a ball.
Left 'Leo' slingshot was chattering - adjusted that, OK. Left rollover that lights up 2 red pops wasn't working. Adjusted that (mangled switch). Seemed OK. Pops 'pop' when they are supposed to, but I have two problems.
1) The pops occasionally (usually first ball) don't score - neither 1 nor (when lit) 10.
2) When the ball activates either of the two pairs of pops, they light up as they should, BUT....when either flipper button is pressed, or when any slingshot is activated, the lit pops all go out.
Operating the four 100 (top playfield) and the two 50 (lower playfield) outer lane wire rollovers has no bad effect - lit bumpers do not go out. Hitting target also has no bad effect.
So: If I manually place the ball in the top part of the playfield and activate the rollover/s manually, all OK while the ball bounces around the lit pops. BUT when ball gets to the lower part of the playfield and touches slingshots (or I press a flipper button) all pop lights go out and pops do not score '10'.
Througout all this, the pops continue to "pop" as they should when hit by a ball.
My experience is limited. I have the schematic. I have no idea what to do next. (Heeeeelp!)