Installation and Troubleshooting 2- 21
Fan Operation Verification
To verify that the fan unit and the power sup ply fan are functioning
correctly you need to visually inspect the fan unit(s ) on the rear of the
concentrator to make sure they are turning a nd that nothing is blocking
their path.
Power Supply Operation Verification
Verify that the LEDs on th e Controller Module appear as defined in
Table 2-3 to check the operation of the powe r supply.
Table 2-3. Controller Module LEDs After Proper Power-Up
LED Proper State
Primary Power On.
Backup Power On. A backup power supply is installed.
Off. No backup power supply is installed.
Temperature (TEMP) Off.