Only logic-level (L) MosFETs work on the driver board

The 74HC273 outputs cannot fully switch a standard MosFET, so the coil and lamp return parts must be logic-level types with an L, such as IRL530. An IRF530 will not work. The 12P06/IRF9530 strobe part is the exception.

Systems

• Gottlieb System 3

Related tips

• Spare MosFETs for the driver boards
• Logic-level MOSFET equivalents: 12N10L, 20N10L, 22NE10L, IRL530, IRL540
• What the A3 driver board drives
• The A11 auxiliary driver board
• Diode-testing the 12P06 strobe MosFETs
• Self-test 9: aux driver board
• Logic chips worth stocking
• Bottom cabinet relays and their drivers

Source: Repairing Gottlieb System 3 Electronic Pinball Games from 1989 to 1996, Clay Harrell (pinrepair.com)