Parts typically ruined by battery leakage on a System 80 CPU board
Chips Z1 4528, Z2 7474 (or 74HCT74), Z3 7404, Z4 4081 and Z36 4069 with sockets; DIP switch SW1; C1 100 mfd 10 V; C2/C5 .01 mfd; C3/C25 .1 mfd; C36 10 mfd 10 V; diodes CR1-CR8 and CR33-CR35 1N4148; R3/R43/R49 5.6k, R4/R5/R44 2k, R6/R45/R46/R48 3k, R7 62 ohm, R8/R50 180 ohm, R9 1k, R34-R41/R54 4.7k, R47 24k; Q1/Q4 MPS-A70 or 2N4403; Q2/Q3 2N4400 or 2N4401; VR1 3 V zener 1N5225B; crystal Y1 3.579545 MHz. Chips, capacitors C1/C36, diodes, transistors and VR1 must go in the right way round.
Systems
Related tips
- Where the battery-area parts sit on the System 80 CPU board
- Clean up battery corrosion on a System 80 CPU board
- Remove the original DataSentry battery from every System 80 CPU board
- Fit a remote AA battery pack to a System 80 CPU board
- Parts usually replaced in the CPU battery corrosion area
- Clean battery corrosion before fitting new parts
- Resistor values in the CPU battery corrosion area
- Using a memory back-up capacitor instead of a battery
Source: Repairing & Upgrading Gottlieb System 80 Pinballs from 1980 to 1989, Part One, Clay Harrell (pinrepair.com)