Omg mine had the same problem exactly yesterday a good friend spent about 4 hrs with me and we finally got I fixed a broken wire and combo of other issues we finally got it squared away in the end not sure we even know what fixed the problem best of luck !!

I would have guessed the ramp optos also but if you have ruled that out. Does anything look funny in the switch test? Is there another switch failing somewhere in the test? Does it work properly in the solenoid test?

Optos were replaced but are they functioning properly? In switch edge, does it register when you break the beam. It sounds like the opto is stuck open. Any errors on boot up?

Get out your switch matrix and see which switches are the chain of the ramp opto. Check all of those very carefully for a short/broken wire.

If that fails, you might have a slightly more annoying issue. My TZ, when I owned it had issues with the right orbit opto randomly triggering. Turned out to be a bad bridge rectifier. So you could also test for 12 volts on the driver board.

Optos are very sensitive to power fluctuations...so if it isn't a broken wire/short (or...a bad opto transmitter/receiver), then you might need to look a bit deeper.

raise your playfield & un-plug your recently replaced optos (4pin plug orange/black/grey wires), start a game and wait to see what happens, if nothing happens or if diverter flips once or twice and then stops completely you do indeed have an opto problem - plug it back in and start another game just to make sure problem returns.

if diverter continues to actuate with the optos un-plugged you probably are having a driver board related issue and needs much more investigation

like some one above mentioned, test the opto voltages on the rear of the optos, should be 12-13volts on each, if one is low (1-3 volts) you may have the new opto soldered in backwards - they only work in one direction, this doesn't sound like your problem since yours works in test mode

the receiver (black) opto at this location is very sensitive to having the emiter lined up correctly and sometimes takes a bit of bending / tweaking of the mounting locations on the ramp to get perfectly aligned, if not aligned correctly you will indeed get multiple signals from your optos

finally make sure opto mounting screws are snug once you sort out your problem

hope this helps ....

It may be missing balls in the trough and is trying to free stuck balls.

Just out of curiosity...can you give the 3rd grade explanation of how you do this?

I had a similar problem at one point, but a little longer delay between the diverter firing. Everything looked good in the matrix, but it still was a problem with the optos not being set up just right. For me, I adjusted the alignment of the optos on the bridge til it didn't randomly fire anymore. In the matrix it didn't look like a problem, but in my case that is definitely what was causing the issue. FWIW, May or may not help your case.

pull your multi-meter out and measure voltage on the solder pads where the two wires are attached on rear of each opto pcb, since the pair of optos in question are located on the upper end of a ramp, you can simply un-screw each opto and measure while holding in your hand of course this measurement is done while machine is turned on-)

hope this also helps