IBM 3270 Maintenance Manual page 594

3. Carefully align the pins on the coprocessor
with the connector and firmly press the
coprocessor in place. Be sure the notch on
the end of the coprocessor faces the rear of
the system board.
4.
Ensure that Switch
2
on the system board is
in the Off position.
Notch in
the Rear
Pins
Connector
5. Reconnect the power supply connectors.
6. Install any option adapters that you removed
(5-20-5).
7. Install the cover of the system unit
(5-100-3).
8. Connect all cables to the rear of the system
unit.
October 1984 5-700-7