MAME Builders: Add an arcade-authentic and fully operational coin door used by some of the largest arcade manufactures to your MAME Arcade Machine.Simply connect the included jumper wire to whatever is running your existing machine. (any Keyboard encoder or Jamma board). If you are building a new machine and need a simple way to interface your arcade machine/parts and a computer, check.

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Step Nine: Arcade Coin Slot Repair

First, if you take a coin and place it in the slot—Does it fall all the way through and not register credits? Or does it get stuck and doesn’t fall through?

A. If it falls through but doesn’t register a credit, then proceed to follow the steps below.

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First, open the coin door. With the coin door open and the game still ON locate the two left and right switches at the bottom of the coin slot. With your eyes look at the wires coming from the coin switch. Make sure both are connected and soldered on. Not taped or glued etc, as some “home owners” have done which will certainly make it lose connectivity over time. If found, solder the wires back in place. One to Normally Open the other to Neutral.

Third, If your finger can’t register a credit manually, then replace the switch itself with a new coin slot switch and solder the wires from the old one onto the new switch. The switch has two screws holding it in place. Unscrew these and the switch simply can be removed. Un solder the wires but make a note of the orientation before you disconnect them. Once your new switch arrives then solder the wires on and screw it back into the coin slot

Chances are if you watch where the quarter is getting stuck you will find that a paper clip, paper, junk, or Canadian quarter is blocking the path. Simply un block the path of the quarter. You may want to open the coin acceptor like so in order to further remove anything in its path. You may just want to replace the coin acceptor at this time with a new one.