Fan replacement

Fans provide cooling for the components in each machine. All fans are considered "hot swappable" and can be replaced while the system is in service.

The following fans can be replaced on site:

• Chassis fans
• SCSI fan tray (MSS-H only)

Replacing a chassis fan

Two fans are mounted at the front of each machine's chassis for cooling purposes.

To replace the front cooling fan on the chassis:

1. Verify that the replacement equipment is on site and appears to be in usable condition, with no obvious shipping damage.
2. Remove the old fan.
3. Install the new fan.

Remove the old fan

To remove a faulty chassis fan:

1. Remove the bezel (plastic cover) on the front of the chassis. See Removing or replacing the front bezel.
1. Press down on the two tabs on the top of the bezel.
2. Rock the bezel forward, then lift it out.
2. Identify the fan that is spinning too slowly or not at all.
3. Loosen the retaining screw at the top of the faulty fan.
4. Tip the fan forward and lift it out. See Removing or replacing a chassis fan.
5. Unplug the power cable to the fan.
6. Set the old fan aside.

Install the new fan

To install a new fan in the chassis:

1. Hold down the latch on the new fan's power connector.
2. Plug the power cable for the fan into the 3-pin connector inside the chassis.

Note: The new fan begins to spin as soon as power is connected.

3. Insert the tab at the bottom of the fan into the slot in the chassis.
4. Tip the new fan back into place. See Removing or replacing a chassis fan.
5. Tighten the retaining screw at the top of the fan.

Note: For safety reasons, tighten the retaining screw with a screwdriver until it cannot be loosened by hand.

6. Replace the bezel (plastic cover) on the front of the chassis. See Removing or replacing the front bezel.
1. Insert the bottom of the bezel into the chassis.
2. Push the bezel upright until the two upper tabs snap into place under the top cover.

Replacing the SCSI fan tray

The MSS high-availability (MSS-H) configuration includes a hot swappable 2-fan tray as part of the SCSI RAID disk-drive assembly.

Replace the fan tray

To replace the SCSI fan tray:

1. Verify that the replacement equipment is on site and appears to be in usable condition, with no obvious shipping damage.
2. Remove the front bezel. See Removing or replacing the front bezel.
   1. Press down on the two tabs on the top of the bezel.
   2. Rock the bezel forward, then lift it out.
3. Loosen the retaining screw on the handle (latch) for the SCSI fan tray.
4. Open the latch to unseat the old fan tray, then pull it by the handle from the drive cage. See Replacing a SCSI fan tray.
5. Position the new SCSI fan tray in the correct orientation in the chassis.
6. Gently slide the fan tray into the machine, then close the latch to seat it firmly in place.
7. Tighten the retaining screw.

Note: For safety reasons, tighten the retaining screw with a screwdriver until it cannot be loosened by hand.

Verify operation of the new fan tray

To verify operation of the SCSI fan tray:

1. Loosen the retaining screw for the chassis fan immediately next to the SCSI fan tray.
2. Tip the fan forward and lift it out. See Removing or replacing a chassis fan.
3. Look into the chassis, and verify that both fans in the SCSI fan tray are spinning.
4. Replace the chassis fan and tighten its retaining screw.

Note: For safety reasons, tighten the retaining screw with a screwdriver until it cannot be loosened by hand.

5. Replace the front bezel.
   1. Insert the bottom of the bezel into the chassis.
   2. Push the bezel upright until the two upper tabs snap into place under the top cover

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