MC34064 watchdog at CPU U10: pinout and substitute

U10 on the CPU board is a three-leg MC34064: pin 1 is the reset output, pin 2 the supply input, pin 3 ground. A TO-92 Dallas DS1811-10 (4.35 V trip) fits, but the guide does not recommend it.

Systems

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

Related tips

• Dead CPU: check the reset and IRQ lines
• DS1811 reset chip: which version to use
• Replacing the MPU reset section with a DS1811
• Replace the System 80 reset circuit with a DS1811 chip
• What is on the WPC CPU board
• Which System 11 CPU boards fit which games
• The CPU must be a 68B09E
• What fails on a WPC CPU board

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