IBM 3270 Maintenance Manual page 304

1.
Set the Power switch for the system unit and
expansion unit (if attached) to Off.
2. Unplug all work station power cord from the
power outlets.
3. Remove the cover of the unit that contains
the fixed disk (see Section 5).
4. Remove the fixed disk signal cable (see
Section 5).
5. Check the continuity of the signal cable.
Data/Control Cable
Disk Adapter
Control Connector
(J1)
Disk Adapter
Data Connector
IJ~II----"""'I
Drive C Data
Cable Connector (J2)
Locating Key
Drive C Control
~_-
Cable Connector
(J1)
Drive 0 Data
Cable Connector (J3)
Locating Key
Drive 0 Control
Cable Connector (J1)
Disk Adapter
Data Connector (J2)
Locating Pin
IS THE CONTINUITY GOOD?
NO Replace the signal cable.
YES
October 1984 3-1700-17