*** PROBLEM RESOLUTION COMPLETE, SUMMARY EDIT (because this thread got lonnnnng):
*** Turns out there was a whole assortment of problems, which is why it took so long to get there. Still, I had superb help from fredsmythson and woz, and a short summary of the problems were:
*** AB / AB-reset switches adjustment required
*** Assorted switch adjustments required on P, Q, O relays
*** Ball stepper Ball 1+ switch adjustment required -- properly tell machine it's moved from 0 ball to 1+ ball position
*** Ball stepper spring adjustment required -- help along the stepper
*** Ball stepper Ball 6 switch adjustment required -- when closed, sends power to O, P, Q relays
*** W relay switch adjustment require (red/white wire and green/yellow wire) -- in circuit which sends power to kicker
***END OF SUMMARY , original post below.
Reference this previous thread (https://pinside.com/pinball/forum/topic/1973-gottlieb-pro-football-score-reel-broken-eos-leg) for history thus far.
I have a 1973 Gottlieb Pro-Football I snagged as a "storage-find" and have been working to bring it back to life. I tore down and cleaned all the score reels, the credit stepper, and the ball stepper. It's acting glitchy during my attempts to start it, however.
I seem to be having issues with the ABR actuation. Per that previous thread, newmantjn mentioned that ABR actuation is triggered by the following: ALL the runout switches need to be closed, AND the ball count unit needs to be at Zero AND the motor 4D switch needs to close properly.
- I've verified the ball stepper resets to zero.
- I've verified the motor 4D switch makes good contact.
- I've verified all my reels reset to zero and switches make good contact.
So here's what actually happens, which is what's confusing me:
** Scenario A: If any of the reels have any score (other than zero) on them, and I hit the start button, the credits decrease by one, the ball stepper resets to zero, and the applicable reel(s) will reset to zero ... but the motor keeps running, and ABR does not actuate.
** Scenario B: If all of the reels are ALREADY at zero (untouched by human hands since the last reset!), and I hit the start button, the credits decrease by one, the ball stepper resets to zero, and the ABR DOES actuate after the motor 4D switch makes contact (and the motor stops like it should).
I'm not convinced everything is hunky dory even in Scenario B, though ... because the next step described in the manual's operating instructions doesn't seem to work. ("Place the ball in the outhole. When the ball closes the ball return switch, Q relay is actuated ... etc." -- but if I manually close that outhole switch, nothing happens.) One thing at a time though; need to get to this point consistently first.
Thanks in advance for any help.