Which transistor types sit where on the driver board
2N6043: Q53, Q59, Q60. 2N3055: Q58, Q62, Q64. MPS-U45: Q1-Q4, Q13-Q32, Q45-Q52, Q54-Q57 and Q63. MPS-A13: Q5-Q12 and Q33-Q44. The 9.1 ohm 1 W resistors are R54, R57 and R60, and the input diodes CR1-CR6 are 1N4148.
Systems
Related tips
- How driver board coil transistors are switched
- How the System 80 driver board is laid out
- A driver board output is stuck on or dead
- System 80 driver board transistor types
- Driver board A3-J5 and A3-J6
- How driver board lamp latches work
- Control board A1-J4 to driver board pinout
- Driver board A3-J2 backbox lamps
Source: System 80 Service Manual, Gottlieb