IGT Game King Multigame doesn't boot up

[sixcardmark]

Yes, normal, try moving the wires to the other switch.

[kmarrocco]

Thanks for the idea.  I have moved the wires to the other switch and still no luck.  I noticed that both switches turn the cabinet light off when the switch is pulled out or pushed in, so at least that half of both switches are working.  Does this mean I need to trace the wires back to their connections in the cabinet as a next step?

[Tilt]

Here's a wiring diagram that will help you trace it out.  Main door and belly door switch are at C3.

[kmarrocco]

Thank you for the diagram.  I have traced it out and I believe I have all the connections from the mother board to the switches correct.  Further, I have tested each switch with my ohm meter and they seem to be working correctly.  Unfortunately, I am thinking the problem is in the motherboard or the main MPU board now.   I am struggling a bit here because I do not have another main MPU board or motherboard to try out.  Any suggestions?  Maybe I need to send either of them out for testing?

Also, I see that only 3 of the 5 yellowish LEDs are illuminated on the main MPU board.  Is this an indicator that something may be wrong with it? 

[Tilt]

Pull the door plunger out and with your multimeter check for continuity between J19 pin 4 and J11 pin 1 at the motherboard.  Leave the cabling plugged in when you do it.  You should have 0 ohms, if it's open then you have a wiring or switch issue.  If it shows 0 ohms then you have a problem either with the motherboard or the MPU as you suggested.

[kmarrocco]

Thanks for the feedback.   It is 0 ohms with the plunger pulled out.  I guess the next step is to try another MPU board or mother board.  Does anyone on here test MPU boards?

[Tilt]

Member Lookes can test/repair them.  I could be also be your motherboard.  There's a few resistors in the circuit for the door circuitry on it. 

[kmarrocco]

Thank you.  I can contact member lookes.  He just helped me with a different MPU from a different game.  Are there schematics available for the mother board so I can ohm it out?  Thanks!

[Tilt]

Oh ok, good.  Yes, here's a schematic for the motherboard.

[kmarrocco]

Update: I sent the MPU and the motherboard away to member lookes and he found an open trace on the motherboard.  It is all set now and the machine is up and running.  Thanks!

[Tilt]

Alright!  Glad Lookes was able to get it running for you  .  Thanks for posting the update too.