Allied Telesis AT-9900s Switches - Manual (Page 10)

Removable Power Supply and Fan
10
Troubleshooting
If the PSU does not function as expected:
■ check that all cable connections are correct and secure.
■ check that the standby switch has been pressed and is in the On position
(DC models).
■ check that the PSU is receiving the correct AC voltage (AC models).
■ if LEDs indicate a PSU fault, replace the PSU or have your authorised
distributor or reseller service it.
Additional troubleshooting information is in the Hardware Reference for the
switch.
Where to Find More Information
■ The Hardware Reference for your switch provides detailed information on
the switch and its hardware features.
■ The Software Reference for your switch provides detailed information to
configure the switch and its software.
■ The Installation and Safety Guide for your switch describes how to install
your switch and includes statutory and safety information.
You can download these documents from www.alliedtelesyn.com
PSU 2 Green PSU 2 is installed and supplying power to the switch.
The voltage output is within specification.
Red PSU 2 is installed in the switch and has exceeded its
recommended temperature threshold of 75º C
(167º F), or the fan has failed.
A FOM is installed in the switch and has failed.
The bay is empty.
Off A FOM is installed and operating at an acceptable
speed.
Table 2: PSU LEDs on the switch (Continued)
LED State Description