Driver board CR2 to CR4 are jumpers on 80A and 80B games
On the MA-295 driver board, diodes CR2, CR3 and CR4 are fitted only on System 80 games; System 80A and 80B boards have plain wire jumpers in those spots, so a missing diode there is normal. The MPS-U45 and NDS-U45 Darlingtons are interchangeable on this board.
Systems
Related tips
- One driver board fits every System 80, 80A and 80B game
- Some 80B driver boards use the coin counter transistors
- Use heavy wire for the optional driver board ground jumpers
- Optional ground mod steps 2 to 9: driver board ground jumpers
- Diode-test a driver board 2N6043
- Diode-test a driver board 2N3055
- How the System 80 driver board is laid out
- Test the driver transistors while the board is out for the ground mod
Source: Premier Technology Parts Catalog (System 80, 80A and 80B), Gottlieb / Premier