Playboy
Bally, 1978I just finished restoring a Bally playboy pinball machine. I installed a new CPR play field. The game was working 100% before I did the swap but now when I go to power the game on the drop target coil locks on. I can’t find any problem with the wiring. Any help would be appreciated.
Coil activation is fairly simple. The banded diode side of the coil get's 43v and a transistor sends a ground to the other side.
To troubleshoot, turn the power off and make sure the solid yellow wire is soldered to the diode band side of the coil.
Unplug J5 from the SD board. Power up, does the coil lock on? if yes you have a ground short in the activation wire. If not you have a board problem.
Also make sure the 1A SB fuse by the flippers is just that. It should blow to protect the transistor from a locked on coil.
Wanna join the discussion? Please sign in to reply to this topic.
Great to see you're enjoying Pinside! Did you know Pinside is able to run without any 3rd-party banners or ads, thanks to the support from our visitors? Please consider a donation to Pinside and get anext to your username to show for it! Or better yet, subscribe to Pinside+!
This page was printed from https://pinside.com/pinball/forum/topic/playboy-drop-target-coil-locked-on and we tried optimising it for printing. Some page elements may have been deliberately hidden.
Scan the QR code on the left to jump to the URL this document was printed from.
Lake Elsinore, CA
Coffs Harbour, NS