Finally, some photos!

Relay add-on board to handle the strobes and knocker solenoid. The relay board next to it is for the contactors, and receives switched +5 volts, and this board taps into that - the switched means there is a switch to interrupt the +5 volts to shut off the noisy stuff for night mode. The relay add-on board also has a constant +5 volts for the strobe relay, since I don't want that turning off with the night mode switch. I ran out of screw terminal blocks, so I just soldered the ground right into the board.

This is the control panel under the front edge of the cabinet. We have the main power switch (big switch toward the rear), a momentary toggle switch as the PC power button (just in case Windows freezes, or something), PC power and HDD LEDs, the night mode switch (says On and Off on it). Beside those, we have a 4-port USB3.0 hub, and at the front of the panel we have the speaker volume, power button, and headphone jack.

The control panel on the inside. There's a bit of sawdust - I jigsawed and routed the hole with the panel in the cabinet (crawled under it like I was changing the oil on a car - got lots of sawdust in the face. Not recommended).

The tilt bobs (so hard not to type "boobs". I had to retype that three times to get "bobs"!). There's one on the other side, too. Each has half the brass ring taped off, so they only contact in one direction.
For those of you wanting to use your coin reject buttons on your coin door as add coin buttons, I've detailed how to make a bracket to get the job done below:

These are the parts you'll need. You won't need 2 of those nuts, as it turns out. I wanted to use them, but they weren't necessary, and they got in the way of the coin mechanism when the reject button is pressed, so I left them out. The short machine screws are 4-40 x 1/4", and the longer ones are 4-40 x 3/4". The aluminum stock is 1/8" thick, 1" wide. All available at Home Depot or something similar. The microswitches I swiped from a few extra arcade buttons I had laying around.

The backet you see in the previous photo with all the measurements and stuff you need. Measurements are in millimeters.

The bracket flipped over, with the microswitches attached, ready to screw to the coin mechanisms.

This is the coin door with the coin mechanisms installed (this is the standard Williams 2-slot coin door). You'll need the coin mechanisms, since we'll be attaching to those (the little hole in the middle of each one is what we'll be taking advantage of).

Here's the bracket installed, ready to be wired. The small screws are just the right length to get through the 1/8" aluminum and into the holes on the coin mechanisms, but not so long that they'll bind the mechanism's movement.

Popping off the plastic switch covers allows us to get our wires connected to the original coin switches. We just wire in parallel with those switches, so you can insert a coin to trip the original switches, or press the reject button to trip our new switches. Wire the grounds of our switches to the grounds of the original switches, and the other side of our switches to the other side of the original switches. I have wired the ground of only one of my switches to the original switches, and the ground of my second new switch to the ground of my first new switch - this saves me having to unsolder the ground on both of the original switches.

The covers are back on, and we're done. Test the mechanism's movement to make sure the microswitches are close enough to be engaged. If they aren't, loosen the screws holding the switches and move them a little bit to get them close enough (the holes drilled in the aluminum are larger than the diameter of our machine screws, so there's some wiggle room to move things around a bit).

Here's everything installed, with the coin reject button not pressed.

Here's with the reject button pressed - the microswitch is pressed in. When you press the reject button, the coin mechanism swings open to drop any jammed coins down through the mechnism. When it does, it hits our switch and trips it. As long as you've wired everything to your IPAC so that the result is 5 or 6 being pressed, then you're ready to rock.
Edited by Darkfall, 26 August 2011 - 09:10 AM.