The A11 auxiliary driver board

Busier games add a small board with eight more 12N10L or IRL530 MosFETs and one 74HC273 latch, cabled straight to the CPU board (P6). It is nearly always used for extra flash lamps, and not every game has one.

Systems

• Gottlieb System 3

Related tips

• Spare MosFETs for the driver boards
• Only logic-level (L) MosFETs work on the driver board
• Diode-testing the 12N10L/IRL530 MosFETs
• Self-test 9: aux driver board

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