Arcade Collecting > Pinball
Playmatic Chance MPU Problem
ChadTower:
I am guessing the coil is shorted and it's only a matter of time before it eats the driver. Could also be the resistance is within the margin of error on his meter or he has it on the wrong range.
DarkSide:
Its nice to hear everybody thinks im a moron, maybe this is my first pinball machine, but still :)
Coil is working, or at least the target go up and down as they should, im thinking its my dmm thats the culprit here, but its also just a cheap one but has so far been good enough for my use.
Let me try to describe how im measuring it, dmm on, set at 200 ohm, probes on the terminals on the coil.
Got everything else fixed today, targets work, ball dispenser, rebuilt the Decoder board.
DarkSide:
Just checked a few mixed coils from the machine and they all show the same on my DMM, so it looks like my dmm cant be used for measuring coils.
The Williams Coil on the Pop bumper is a G-23-750, and should be 3R9 in Resistance according to http://flippers.com/coil-resistance.html
DarkSide:
--- Quote from: pinballjim on September 14, 2011, 12:47:58 pm ---Drill a hole in the front of your cabinet and run a string to the drop target reset bracket. Yank on it when you knock the targets down.
Also, invest in a self-ranging DMM. 3R9 in flippers.com language means 3.9 ohms. What's the lowest setting on your DMM??
--- End quote ---
Lowest is 200 ohm, so it looks like i need a new DMM, if we say 3.9 ohm, i would suppose that its in the same rating the drop targets coils are.
DarkSide:
You sir are brilliant.
Found my old dmm, and checked the coils, both came in at around 4.6 ohm, so i took a drill and at slow speed cleaned out the sleeve that was melted, fitted it to the machine, and guess what, it works.
Its a bit slow compared to the other coil, but it can be a matter of adjustment.
Both sets of drop targets work.
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