IBM 3270 Maintenance Manual page 619

3. Connect the control connector (Jl) and data
connector (J2).
Control Connector (J1)
Data Connector (J2)
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4. Insert the Fixed Disk Adapter into the option
expansion slot. Press down firmly on the
adapter to seat the connector.
5. Install the adapter mounting screw.
6. Install the cover of the system unit (or
expansion unit) (5-100-3).
5-1700-20 Maintenance Information