Protogate Freeway 3414, Hardware Maintenance Manual, Page: 39 / 72

3: System Indicators and Power Supply
DC 900-2031A 39
unit. Also, the cooling fans will not be turning. Replace the failed power supply module
as described in Section 3.2 on page 41 .
When the HDD LED is blinking GREEN, it indicates disk read/write disk activity.
When there is no disk activity, the LED is off (not RED). There is no alarm for the HDD
indicator.
When the FAN LED is RED and blinking, it indicates a failed cooling fan. Inspect and
replace the cooling fans as described in Section 2.4 on page 33 .
If the TEMP LED is RED and blinking, the system detects rising temperature inside the
cabinet. Inspect the rear section for any blockage.Make sure airflow inside the cabinet
is smooth and not blocked by dust or other obstructions. Then inspect the fan filter and
clean or replace if needed as described in Section 2.5 on page 36 .
3.1.2 Power Status LEDs
Table 2 shows the power status LED indicators. When a LED fails to light, it indicates
a problem with one of the voltage signals and an audible alarm is sounded. To stop the
alarm buzzer, press the Alarm Reset button. Check to make sure that the power supply
connector is properly attached to the backplane. If the problem persists, consult an
experienced technician.
Table 3–1: System Status LEDs
LED Description RED GREEN Alarm
PWR System power Failure Normal YES
HDD Disk drive activity N/A Data access NO
FAN Cooling fan status Failure Normal YES
TEMP Cabinet temperature Abnormal Normal YES