Update
Updating database... Please wait.
Sunday 6 May 2018 at 08:39
Since you took the backbox off, first thing make sure the Jones plugs are plugged in correctly, including the little one from the playfield to the backbox. Beyond that I'd need to see a high quality scan of the schematic from e.g. Staples ($2) or Kinkos ($6)
Source: http://pinside.com/pinball/forum/topic/pioneer-wont-advance-past-1st-ball#post-4382063