Replacing The Emu Board - Compaq StorageWorks TM RAID Array 3000 Pedestal Storage Subsystem Hardware User's Manual

Replacing the EMU Board

Tools required:
Flat-blade or 3/16 in(5 mm) hex-head screwdriver
# 10 TORX-head screwdriver
Perform the following procedure to replace the EMU Board:
1. Quiesce the host bus by shutting down the host system.
2. Unplug the base pedestal power cord from the wall outlet.
3. Unplug the UPS power cord from the wall outlet. The UPS will now
signal the controller to flush the cache.
4. Wait until the UPS shuts down completely (this may take several
minutes).
5. Power off the base pedestal and plug the UPS power cord into the wall
outlet.
6. Remove the pedestal door.
7. Remove the left side cover from the pedestal (see "Reconfiguring the
SCSI Bus").
8. Record the orientation of the color traces on the two ribbon cables
connected at the rear of the EMU board and disconnects the cables.
9. Remove the hex standoffs from the UPS and external fault connectors
on the rear panel using a hex-head or a flat-blade screwdriver
(Figure 3–7).
10. Remove the board from the pedestal.
WARNING: Only qualified service personnel should replace the EMU. Dangerous
voltages are exposed when the pedestal side panel is removed. Always power
off the pedestal and remove the power cords before replacing the EMU.
CAUTION: To allow the UPS to supply power while the cache is being flushed
to disk, do not unplug the base pedestal from the UPS.
Maintenance 3-11