User manual

21 Chapter 3
3.1.3 LED indicators for Power Status
The following table is the individual LED which indicates the status of
the backplane voltage signals.
When an LED fails to light up, it means there is a problem with one of the
voltage signals. Please check if the power supply connector is properly
attached to the backplane. If the problem persists, consult with an experi-
enced technician.
3.2 Replacing the Cooling Fan
There are three cooling fans located in the middle of the chassis. All of
them are hot-swappable and provide the system with ample cooling by
blowing air rearwards. To replace the cooling fan, please refer to Figure
3.1 and proceed as below.
1. Remove the front top chassis cover.
2. Loose the thumb screw on top of the fan unit and then smoothly pull it
out. It will disconnect the cooling fan power connector.
3. Replace the cooling fan with a new one.
4. Fix the new cooling fan by fastening the thumb screw.
5. Replace the front top chassis cover and fasten it.
Figure 3.1: Replacing the cooling fan
LED Description LED on LED off
+5V +5V signal Normal Abnormal
+12V +12V signal Normal Abnormal
-5V -5V signal Normal Abnormal
-12V -12V signal Normal Abnormal
+3.3V +3.3V signal Normal Abnormal