Protect coil diodes with a heat sink

When soldering a lug that has a diode attached, clip an alligator clip or small heat sink on the lead between the joint and the diode so heat does not reach the diode.

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

Related tips

• Testing the diode on a coil
• Coil diode polarity
• Diodes on coils: EM and solid-state coils are not interchangeable as-is
• Testing a coil diode
• What a bad coil diode does
• Which way a coil diode goes
• Which way a coil diode goes
• What the coil diode does and how a bad one shows up

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