Daktronics AB-1600-1.5,2.5 - Manual (Page 59)

Maintenance & Troubleshooting
4-15
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Check the fan blades for dirt and debris. If the fan blades have a large accumulation of dirt and
debris, this indicates that the filters need to be changed more often. Fan blades must be kept clean
to maintain fan efficiency and ensure proper cooling.
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Spin the fan blades with a pen or pencil to ensure that the bearings are free and the fan is still in
balance.
After replacing 10% of the fans, Daktronics recommends replacing all cooling fans to reduce
associated maintenance costs that may incur with increased heat buildup from fan failure.
4.10 Troubleshooting the Internal Temperature Monitoring System
The fan controller enclosure, found within the display, contains various components for monitoring and
controlling the fans in the display. Twelve LED indicators on the fan controller card report the status of
the temperature monitoring system, as illustrated below.
The fan controller card, found in the fan controller enclosure, Figure 57, accepts signal from a
maximum of eight fans.
If the RPM of any fan goes below a certain rate, the fan controller will send a signal to the display
controller to blank the display. Bad fan bearings may cause a fan to run slowly. Use a pen or pencil to
spin the fan. If the fan bearings are bad, the fan will not spin freely–refer to Section 0 for more
information regarding fans. A slow fan can also be caused by a plugged filter–refer to Section 4.8 for
filter maintenance information.
Figure 57: Fan Controller Card