MPU reset section parts by position

Q1, Q2: 2N3904. Q5: 2N4403. VR1: 1N4738A 8.2 V zener. CR8: green LED. CR5, CR7: 1N4148. CR44: 1N4004 or better. C1, C2: 820 pF axial ceramic. C5: 4.7 uF radial tantalum. C3, C13, C80: 0.01 uF axial ceramic. R1, R3, R24, R28: 8.2k. R2: 120k. R11: 82 ohm 2 W. R12: 270. R16: 2k. R17: 150k. R29: 470 1/2 W. R107: 3.3k. R112: 1k. R134: 4.7k. R140: 20k. Resistors are 1/4 W 5% unless stated.

Systems

• Bally MPU AS-2518-17
• Bally MPU AS-2518-35

Related tips

• Testing an MPU in the game with only J4 connected
• Replacing the MPU reset section with a DS1811
• MPU board test points
• MPU board test point voltages
• Why the MPU has ROM jumpers
• Telling a -133 MPU from a -35 or -17
• Converting a -133 MPU to a -35
• Setting up an MPU for the test EPROM

Source: Repairing Bally Electronic Pinball Games from 1977 to 1985, Part Two, Clay Harrell (pinrepair.com)