Installing Or Replacing The Scsi-B Cable - Silicon Graphics 1400 Server Family Maintenance And Upgrade Manual

Chapter 1: Working Inside the System
20

Installing or Replacing the SCSI-B Cable

The cable for channel B has two labels. The channel B cable connects from the SCSI-B
connector on the baseboard to one of the external ports at the back of the server. If you
are uncertain which connector on the baseboard is SCSI B, see Figure 4-1 in Chapter 4,
"Technical Reference."
Before you install or replace the SCSI-B cable, read and heed all the safety warnings at
the beginning of this chapter. After you shutdown the system, unplug all AC power
cords from the system power supplies or the wall outlets. You may also need to
disconnect all peripheral cables and telecommunication lines connected to I/O
connectors or ports on the back of the system (especially in rackmount units). Use the
following steps to install or replace the cable:
1. Remove the system access cover and carefully take out the rear foam cover.
2. If desired, you can remove the front foam cover and unscrew and swing out the
front subchassis.
3. Remove the memory module.
4. Remove any existing SCSI-B cable if it is defective or damaged.
5. Attach the new or replacement SCSI-B cable to the SCSI-B connector on the
baseboard. Leave the cable unconnected at the other end.
6. Reinstall the memory module.
7. Remove one of the two knock-out covers, or remove the existing external SCSI-B
connection if installed. See Figure 1-10 at the back of the system. If the server is
upright in pedestal mode, the two covers are at the bottom left, to the left of the I/O
panel.
Place the tip of a flat-blade screwdriver, or the end of another suitable tool, in
the slot in the center of the knock-out cover.
Rotate, twist, etc., the screwdriver until you free the cover by breaking the small
metal tab that holds the cover to the chassis. Be sure to remove covers that fall
into the chassis.
8. Attach the cable connector to one of the ports at the back of the system as indicated
in Figure 1-10; note where the cable exits the foam and in the expanded detail,
where the cable attaches to one of the ports.
9. Use two screws (included) to secure the connector.