Technical data

9
9-1
9Field Replacable Units
This chapter contains procedures for replacing the various Field
Replacable Units (FRUs) in the XR series chassis.
For the 3-slot chassis, procedures are given for:
❏ Cooling Fan Removal and Replacement
❏ 3 1/2-inch Drive Removal and Replacement
For the Dual 9-, 12-, and 20-slot chassis, procedures are given for:
❏ Control Board Removal and Replacement
❏ Fan Tray Removal and Replacement
❏ 12-Slot Chassis SCSI Drive
3-Slot Chassis
Cooling Fan
A DC-powered fan provides forced-air cooling for the
VMEmodules and mass storage drives in the card cage. The fan is
mounted in a module next to the card cage. If the fan fails, the
module is replaced as a unit.
Removal
1. Switch the power supply of the system to the position
(Standby) and disconnect the system from the AC or DC
power source:
– If the power supply is an AC unit, unplug the power cord
from the AC outlet.