Replacing MPS-U45s: CEN-U45 yes, TIP102 not recommended
The MPS-U45 is rated only 10 W at 40 V and has fragile leads. The CEN-U45, in a TIP102-style case, is a direct drop-in replacement. A TIP102 can be fitted by turning it round and crossing its base and collector legs (U45 is E-B-C, TIP102 is B-C-E), but it is not recommended.
Systems
Related tips
- Diode-test the driver board MPS-U45 and MPS-A13 transistors
- Drop bank reset coil dead everywhere: driver ground wire moved to the wrong J4 pin
- One driver board fits every System 80, 80A and 80B game
- First power-up, step 5: add the driver board, then coil power
- Coils lock on and burn because of the Gottlieb ground fault
- What the System 80 ground modifications achieve
- Test the driver transistors while the board is out for the ground mod
- Ground mod step 5: direct ground wire to the driver board
Source: Repairing & Upgrading Gottlieb System 80 Pinballs from 1980 to 1989, Part One, Clay Harrell (pinrepair.com)