LOTR burning flipper coil fuse

hackbar

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I'm working on a Stern LOTR that's blowing a flipper fuse. Not right instantly, but after a day or so.

I figured it was the EOS, but that seems to be fine. The flipper works fine with a new fuse.

The solenoid has burned the label on it (I think its thermal paper) but the wires look good and it reads at about 3.5 ohms. The diode looks normal, but I haven't tested it. Can you test them when they are soldered in?

Anyone got any suggestions?
 
You can't test a diode in circuit. And I seriously doubt it is the problem.

I would swap the left and right flipper coil and see if the problem moves, if so replace the coil.

LTG :)
 
I would swap the left and right flipper coil and see if the problem moves, if so replace the coil.

I swapped the coils, and the left flipper is still blowing the fuse. What's the next thing to check, now that I ruled out the coil?
 
Is the coil locking on and blowing the fuse ? If so then the transistor that drives it.

LTG :)
 
Is the coil locking on and blowing the fuse ? If so then the transistor that drives it.

LTG :)

Unfortunately the machine is on location so I haven't seen when it blows. It seems to take about 2 days to blow though, not right away. I'll try replacing the transistor. Could it be anything else?
 
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