Quoted from Danch:
I'm having the first maintenance issue I can't figure out on my first machine and wanted to sanity check this with some more experienced folks to make sure I'm headed down the right road:
The left loop rollover was not registering so I replaced it and it seemed to be working ok for a while. Then my dragon kickback wasn't firing at all, or firing late when the ball was on the way back down. The kickback worked in test mode but the opto was registering intermittently in the switch test so I replaced that, but no improvement.
Now during switch test everything will work perfectly for a few minutes but then the rollover, opto, and the targets on each side of the left ramp will stop registering completely while other switches work fine. Then after a few minutes everything goes back to normal for a little while before they stop again. No errors are reported to include the node board tests and I tried reloading software but the problem is still there. All of the affected switches are on node 10 so I'm thinking that may be the culprit? Is there anything else I should try before dropping $200 on a node board?
I had same issue on dragon kick back. Had to pull upper playfield, remove plastic on top of Dragon kickback and throughly clean OPTO sensors. Have not had any issues since.