Extreme Networks ExtremeSwitching VDX 6740 - Removal and Replacement Procedures; Before Beginning Replacement

Removal and Replacement Procedures
• Before beginning replacement .................................................................................................................................................................109
• FRU replacement in a VDX 6740...........................................................................................................................................................110
• FRU replacement in the VDX 6740T....................................................................................................................................................112
Before beginning replacement
The
eld-replaceable units (FRUs) can be removed from the device and replaced without special tools. The device can continue
operating during the FRU replacements if the conditions specied in the procedures are followed.
NOTE
Read the "Caution and Danger Notices" in this guide before servicing.
CAUTION
This document describes how to change eld-replaceable units (FRUs) for units with either a port-side air exhaust or a
port-side air intake. You must replace a failed FRU with a FRU of the same type. This applies to both power supplies and
fan assemblies. A new FRU must have the same part number (P/N) as the FRU being replaced. The manufacturing P/N is
located on the top of the FRU. The P/N ends in either -F (front-to-rear airow) or -R (rear-to-front airow). You must use a
replacement FRU that has the same airow designator with the part number.
DANGER
The procedures in this manual are for qualied service personnel.
If a mismatched power source or fan assembly is installed by mistake, a warning is sent to the console. Warning messages will be similar
to the following:
• For a fan mismatch: WARNING, [product name] , MISMATCH in FAN Air Flow direction. Replace FRU with fan air ows in
same direction.
• For a power supply or combined power supply and fan mismatch: WARNING, [product name], MISMATCH in PSU-FAN FRUS
Air Flow direction. Replace PSU with fan air ow in same direction.
You can use external labels as a guide. The power supply and fan assemblies are labeled with an airow symbol on the faceplate to
indicate whether the FRU takes in or exhausts air. The symbol also appears on the top of the FRU. All FRUs in a chassis must have the
same label axed so that airow direction is consistent. The following illustration shows examples of the airow labels.
CAUTION
Ensure that the airow direction of the power supply unit matches that of the installed fan tray. The power supplies and fan
trays are clearly labeled with either a green arrow with an "E", or an orange arrow with an "I."
ExtremeSwitching VDX 6740 Hardware Installation Guide
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