(Topic ID: 262133)

Replacement coil for A-15943 (williams)

By Chicoman

1 year ago

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  • 3 posts
  • 3 Pinsiders participating
  • Latest reply 1 year ago by Pin_Guy
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#1 1 year ago

Recently ordered a replacement coil for A-15943 for an Indiana Jones Pinball Machine. The replacement coil according to several sites is a FL-11753. My question is that new coil the FL-11753 has 2 diodes across the terminals where as the original coil the A-15943 does not have those diodes. I don't want to cause any permanent damage to the machine before connecting it or fry something I'm not supposed to.

Do I just install this new coil with the 2 diodes attached or do I need to remove those diodes before installing this coil? It's for the UP/DOWN post for the mini-playfield.....original part A-15943 which is apparently NO LONGER MADE.....replaced by the FL-11753.

Any help is appreciated.....

#2 1 year ago

The diodes are for something like protection.
Are you sure that the original is not with removed/cut diodes previously?
You can measure (with DMM) and compare both coils so you will know where each wire must go from the original to new one.

#3 1 year ago

You can probably go either way; if you leave them on, be sure that your 50V power connection (GRY-YEL) is connected to the end terminal with the stripped side of the diode or you will break things.

Your game already has an FL-11753 without diodes that's powering the diverter and uses identical circuity on the Fliptronics board. Fore reference, PN FL-11753-1 is the same coil without diodes. This is a fairly low power coil, similar in strength to the coil in a popup target, but you still wouldn't want to drive that for a long period of time which is why Williams is powering this from Flipper 4 on the Fliptronics board.

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Fill disclosure: I do not own, nor have I ever worked on a Williams IJ.

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