Extreme Networks ExtremeSwitching VDX 6740, Hardware Installation Manual

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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 field-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 specified in the procedures are followed.
NOTE
Read the "Caution and Danger Notices" in this guide before servicing.
CAUTION
This document describes how to change field-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 airflow) or -R (rear-to-front airflow). You must use a
replacement FRU that has the same airflow designator with the part number.
DANGER
The procedures in this manual are for qualified 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 flows 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 flow in same direction.
You can use external labels as a guide. The power supply and fan assemblies are labeled with an airflow 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 affixed so that airflow direction is consistent. The following illustration shows examples of the airflow labels.
CAUTION
Ensure that the airflow 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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