I have an AF that "Thing" wont operate in the game. When checking the motor, the up and down optics keep flashing open and closed continuously. have replaced the optic board at the "Thing" on the motor, replaced both chips on the optic control board and the 2 chips that tie in to that circuit on the WPC CPU BOARD. I can run the motor in test and check the optics in the optic test and all is well but in motor test they are erratic. Any help would be appreciated.

Replaced the board with a new one so no bad solder, checked wires all the way back to the board and all are good. I did just discover if I block both optics in the motor test it shows both closed and stops acting crazy. unblock them and it goes crazy again.
It's about quitting time today, will try more Monday.

Bally part # A-15285 2-opto switch assembly board. It is a board that mounts to the motor assembly that has the optos and diodes soldered to it. I do have over 28 years experience working on vending equipment and 19 plus of that is only amusement machines and pinballs. This is the first time I can't figure out the problem so I had hoped to find someone who knows the Addams Family pinball first hand.

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In switch edge test they do work properly. In the motor test both keep flashing open and closed even without the motor running. If I cycle the motor to block one it stops beeping and flashing for it but the other keeps going. If I block the second one while the first is still blocked everything stops beeping and flashing and shows normal. I've looked for wires crossed or shorted but no luck.

Yes, it is plugged in proper and secure. It connects to the magnet in things fingers and the magnet will work in test.

Ok. I'm grasping straws now. Voltage to the optic board is 9.6 vdc. it should be 12 vdc. On the schematic it shows I should have 9.8 vac going to the main board and converted to 12 vdc unregulated, but I'm only getting 6.6vac off the transformer going to the board and 9.6 vdc out from the main board. I have checked all my known sources for a transformer but they are obsolete. If anyone has a spare, please let me know. until then I'll keep trying other options. Part number #5610-12835-00

I checked the pins, all are clean and fit tight. input voltage is 117vac but all outputs show low voltage compared to schematics.
I'll be off for the next 4 days but will next week see if I can locate a transformer with 9.8 vac output to run separate at least to test if not permanent.

Transformer was tested both ways and no change. No extension cord and getting 117 vac.

No luck yet, will check out CactusJacks post #23 today and see what happens.

Will try this today and see what happens.

I did the bypass and no difference.

Before placing the jumper on the thermistor I had 9.6 VAC on the white/green wires. With the jumper I get 12.6 VAC. I do have a new Thermistor ordered.

I do have good AC voltage going into the transformer but there are no jumpers that can be moved. only wires going into pins on the plugs. Only 3 people have worked on it since it was purchased new and all worked fine until recently. My original problem was rebooting when both flipper buttons were pushed at the same time, We brought the machine into the shop to fix that problem and discovered the issue with "thing" not operating. After talking with everyone on here and others locally I don't really think the transformer is causing the issue, voltages are slightly low but not critical and everything else is working fine.

If I go to "thing" test the optics show to continuously open and close regardless if the motor is running or not. if I run the motor to up or down position blocking the optic it will show open as it should but the other one keeps showing open and closed. I have replaced U14, U18, U19 and U20 on the WPC CPU board that all show to control these optics. I have replaced the 2-Opto assembly with a new one. (that's the Opto board for the motor) I have traced the white/yellow, white/green, and green/grey that are all part of that circuit and no shorts, nicks, bad diodes on other components or switches. It must be the Addams Family curse.

No similar flashing and for some reason the "thing" optos don't go through the opto board with the others. I did replace both LM339 IC's and the capacitor, no change so I unplugged it just to see and still had the same issue.

Just for fun I ran a jumper from TP3 (12 VR) to J118 pin 2 to get 12 VDC to that circuit. (Its only getting 9.7 from TP1 circuit but should be 12 VU) with this done everything works perfectly. I have already replaced the Bridge Rectifier and Capacitor in that circuit but for some reason it can't get the voltage needed to work the optics.

Does anyone know of any issues that may come up if I run a permanent jumper from TP3 to this circuit?

I had changed BR5 and C30, I did go back and reflow the solder on F116 and replaced the fuse. Still same output and issue. At the very least, I now know everything else is ok and working. Now I just have to figure out this voltage issue.

IT'S FIXED!!!!!!!! A hair line crack in the trace underneath C30. I ran a jumper wire soldered at both ends to bypass the trace.
Thank you to everyone for your help and patience.