Arcade Collecting > Pinball
New pin: Lethal Weapon 3 (Update: FIXED)
shardian:
Coil is a 5005, red label on that kickout. I resolder both connections. Verified the linkage works fine, with very little effort. I'm baffled. I traced the power wires, and didn't find anything odd yet. I did find another bulb with a busted off solder joint though.
Like I said, it just barely nudges the ball when it is time to kick out.
shardian:
Okay, definitely mechanical...but I don't know how/why. I replaced the sleeve, but the one I pulled was perfectly fine. There are no lubricants to speak of to gunk it up. The end of the plunger felt like it had some rough edges, so I sanded it down and then polished it with 2000 grit. It feels great when I just put the plunger in/out with the assembly disconnected.
Put it all together, and it only moves about 1/8". If it put my finger on the linkage just a bit to get it past that point, the coil will fire. Any more ideas? I can't think of anything else to do now.
shardian:
--- Quote from: pinballjim on August 31, 2009, 09:56:19 am ---Sounds to me like you've got a sloppy part in that linkage. I'd see about replacing it.
Other thing you can do is see if the link can be flipped over and used the other direction.
--- End quote ---
Grr.... I'll go ahead and tear out the entire assembly this evening and give it a thorough once over.
regarding pre-drivers. Is it possible that one of the pre-drivers is bad, and I'm only getting a fraction of the voltage necessary. I'm not an expert on transistors, but is it even a remote possibility that this could be the issue?
Could I simply disconnect the signal side of the bad assembly, and jumper over to another kickout during test mode?
shardian:
--- Quote from: pinballjim on August 31, 2009, 12:39:19 pm ---Stop over complicating this.
--- End quote ---
I just want to make sure I have all possibilities ready to test in my limited tinker time. I telling you that there is absolutely nothing different about this saucer than the other 2 in the game. If anything, it is in better shape than the others.
Is it really complicating things to bridge a signal wire to make another coil fire via the same transistors? I just want to make sure it is something I can do safely.
shardian:
--- Quote from: pinballjim on August 31, 2009, 02:49:45 pm ---If the game is attempting to fire the coil when it should be, you do not have a logic problem.
--- End quote ---
Someone mentioned it, and I did see in my brief overview of the pinrepair document that some coils can have 1-2 pre-drivers. Like I said, I have no clue how exactly this works yet. For all I know, the main transistor could be bad and the pre-driver is sending a ridiculously weak signal to the coil - but a signal nonetheless.
Like I said before, is this even a remote possibility? Even when I pushed it past that 1/8" mark, it seemed on the weak side.
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