EOS switch: normally closed on older games, normally open on Fliptronics

Every flipper has an end-of-stroke switch and a broken one should always be fixed. Pre-Fliptronics games use a high-voltage, normally closed EOS switch; Fliptronics games use a low-voltage, normally open EOS switch read by the board.

Systems

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

Related tips

• Pre-Fliptronics EOS and cabinet switches: file clean, open about 1/8"
• Measuring a pre-Fliptronics flipper coil and its EOS switch
• Checking flipper buttons and EOS switches in switch test
• Weak or dead flippers from failing LM339s on the Fliptronics board
• End-of-stroke switches: pre-Fliptronics versus Fliptronics
• Fliptronic flipper dead though the button reads
• Fliptronics: flipper button does not register in switch test
• Flipper buttons not seen by the game (pre-Fliptronics)

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