Anybody ever have issues with the left scoop intermittently firing when no ball is present and then other times not firing when a ball is present.

I have cleaned and aligned the scoop optos, tried reseating all connections to the boards associated with the optos, and shored up all my grounding braid points in the cabinet just in case.

The issue started happening very infrequently at first but now makes the game unplayable. It also happens more frequently the longer the machine is on, and now is even popping in attract mode!

My only other thought is it is being triggered by light bleed/shadowing under the playfield as nearby LEDs flash?

Any help is greatly appreciated!

Thanks for the suggestion.

I got motivated last night and reflowed the solder to the Optos and re-sat all idc connectors under the playfield. I also removed the VUK in the scoop and cleaned everything. Played a few games and no misfires so far.

Have you guys found that a VERY fast/clean shot around the right loop will trigger combos or skill shots but not advance a room as it should?

I also have had some intermittent issues with the cold ethyl/upper crypt switch not detecting balls entering the top and then having to ball search and screwing all the game logic up until a hard reset. I adjusted the switch multiple times, but the problem is really random. I wanted to see if others have an issue as well.

I was considering switching to an opto pair in for top entry into the crypt instead of the switch? Has anyone made that conversion?

Mine is terrible the same way as yours and I have the gold resistor. Works like 20% of the time. Let me know if you find an alternate fix or setting that functions properly.

Good evening ladies and gents… I’m having a nightmare of a time with my crypt drop opto staying stuck open/not connecting the emitter and receiver. I have replaced the optos, replaced wires and connectors, metered the connections and used known working opto pairs and replaced the opto power board with a known working board. I resat all communication connectors at the multimorphic boards and in the back box.

I’m getting consistent 10v on the receiver and 1.55v on the transmitter side. I have resat all connectors on the multimorphic sw-16 board associated with the opto switch in question and also replaced the one that controls the drop opto with a known working board. I’m just at loss for other places to look to troubleshoot it. I have even gone as far as running a new harness with new optos to both sides externally and I cannot get the opto to show as making a connection.

Where else can I look?

Thanks!

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I tried switching the boards, the problem did not travel with the board. In measuring voltage, I found my receiver was throwing a very high number so I ran new black and white wires all the way back to the ground and the power pin on the receiver. Externally the wires looked just fine and all switch connections were solid in the daisy chain. I was able to get the optos working and installed after running the new wires. I’m guessing it was an internal damaged wire on the receiver side for anyone with a similar gremlin in their machine!