Quoted from troxel:
Thanks for all the help so far. I had a chance to look at this a little bit more today and still had a few questions.
#1. The two trough switches should be closed when the balls are in the trough and open when not in the trough? If that's true, then they show up in the switch test as closed.
Do you mean they show up as closed when the balls are not in the trough? Remove the apron (cover) and check is switch individually for positive activation with a ball and make sure each goes off when ball is removed. I'm just not clear on the second part of your statement.
Quoted from troxel:
#2. Noticed that the coil only had one diode connecting the outside lugs. I installed 2 new diodes and went through the guide. Is there only one fuse for both flippers and that's on the flipper power supply board? If so, it checked good. I cleaned the EOS switch and the button switch. Tested for 50 volts and got 71 Vdc. Coil did fire when grounded to the middle lug. Tested ohms and got 4.1 on one side and 360 on the other. This seems out of spec from the guide, but not sure what it should be since it's a FL-17636. Any other suggestions?
Don't worry about the coil measurement at this point. You know it fires manually and you can't test it accurately in circuit anyways, so move on to troubleshooting why it doesn't fire with the cab switch.
OK, good - coil is getting power and you grounded it so it works. Now you need to find out where you are losing the other half of the circuit.
Flipper pwr supply(+)-----> Flipper coil ----->Flipper switch----->Flipper enable relay (CPU)----- Ground (-)
^you know this part is good.................^
Start by measuring for DCV at either contact of the flipper cabinet switch. On one side you should have your 71VDC. And...If you ground the 71VDC with a jumper here the coil should fire as well.
From there, you would need to check continuity back to the CPU and flipper enable relay. I just measure from the ground side of the flipper switch to ground when in game play mode. If this resistance is high, then you would measure continuity from the cabinet button back to the MPU connector 1J19 pins 1 or 2 (for left or right flipper). Problems with 1J19/1J20 connector and pins are common. If it is making it to the connector and all is well with that, then the flipper enable relay and its components can be suspect. But check all the preceding first before we get into that.