Nitro Ground Shaker
Bally, 1980You're currently viewing posts by Pinsider Tuukka.
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The pull-in winding (thicker wire) is OK at 5 ohms.
You should see 40 volts at coil common, and the hold winding (thin wires) should be shorted by EOS switch. When the other side is grounded via flipper button and relay, pull-in winding is energized, making the flipper go up. And when the flipper is up, EOS switch opens, making the current go through both windings to prevent overheating.
Check the coil connections and EOS switches.
Your coil or EOS switch is wired incorrectly.
If the plunger stays in when manually pushed, it is not because of EOS, but because the hold winding catches the plunger when it is in enough.
The EOS switch does not energize any windings, instead it shorts out the holding winding (letting all power to pull-in winding) until the EOS opens.
Quoted from Sasq:What should the amperage available be for the initial 43V inrush?
Since the pull-in coil is marked 3.1 ohms, current is 43/3.1, or about 14A. The voltage drops a few volts under load, so actual current may be less. Also contact resistances on relay, connectors, flipper button and EOS switch decrease the maximum current a bit.
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