Checking a flipper coil's resistance

Steps

• With the game off, put one meter lead on the centre coil lug and the other on each outer lug in turn.
• Compare with the coil's listed values: the higher reading should be within about 10% and the lower within about 3%.
• A coil outside those limits, or the wrong type for the game's manual, should be replaced.

Systems

• WPC Alpha-Numeric
• WPC Dot Matrix
• WPC Fliptronics
• WPC DCS
• WPC-Security (WPC-S)
• WPC-95

Related tips

• Flipper coils have two windings
• Replacing a flipper coil
• How a two-winding flipper coil works
• WPC flipper coils, weakest to strongest, with resistances
• Testing the diodes on a flipper coil
• How the two windings of a flipper coil work
• Fliptronic flipper coil wire colours
• Williams flipper coils from weakest to strongest

Source: Repairing Williams/Bally WPC Pinball Games from 1990 to 1999, Part Three, Clay Harrell (pinrepair.com)