Transparent view of K4120
- Keyboard (7361).
- Controller board B7701.
- Power supply board B7451.
- 3x Driver boards (from left to right) B7704-1, B7704-2 and B7704-3.
- Transfer board B7707.
- 2x Chopper board + Brake chopper board B7705.
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Design A. Schwendener