Fuse rating rules

Never fit a fuse with a higher amp rating than specified, and never swap a fast-blow for a slow-blow (or use slow-blow where it is not called for). Never bridge a fuse with wire, foil or a nail. The voltage rating must be at least the circuit voltage: a 32 V fuse does not belong on a 110 V circuit, though a higher-voltage fuse is fine on a low-voltage one. A lower amp rating will not harm the game but may blow.

An oversized or bypassed fuse can let a short overheat wiring and start a fire.

Systems

• Williams System 3
• Williams System 4
• Williams System 6 / 6A
• Williams System 7
• Williams System 9
• Williams System 11
• Williams System 11A
• Williams System 11B
• Williams System 11C
• WPC Alpha-Numeric
• WPC Dot Matrix
• WPC Fliptronics
• WPC DCS
• WPC-Security (WPC-S)
• WPC-95
• Bally MPU AS-2518-17
• Bally MPU AS-2518-35
• Stern MPU-100
• Stern MPU-200
• Bally 6803
• Gottlieb System 1
• Gottlieb System 80
• Gottlieb System 80A
• Gottlieb System 80B
• Gottlieb System 3
• Data East CPU Version 1/2
• Data East CPU Version 3
• Data East/Sega CPU Version 3b
• Capcom
• Electro-mechanical

Related tips

• Use the exact fuse type and rating
• Testing a fuse
• Checking a fuse properly
• Primary line fuse rating
• Gottlieb EL fuse numbers by rating
• Fuse letter codes
• Fuses to keep for EM games
• Check every fuse for the right rating and type before power-on

Source: Pinball Machine Care & Maintenance, Bernard B. Kamoroff (Bell Springs Pinball Alley)