Daktronics BA-1518 - Manual (Page 48)

TNMC Maintenance
and Troubleshooting 9-7
9.9 Fans
Fans are provided to control the heat buildup generated by the electronic components. One cooling fan
is provided for three modules (8x16 display modules).
Check fans after the display has been in operation for 1,500 hours
-and every 1,500 hours thereafter-to
ensure the display is being cooled properly. Fans should be checked more often if the display is located
in a dusty or harsh environment (i.e., along a gravel road with dust-laden air).
1,500 hours is equivalent to 83 days if the display is operated for 18 hours a day and the power to the
display is turned off when not in use to ensure that the fans are not operating when the display is not
running. 1,500 hours is equivalent to 62 days if the display is on running non-stop, 24 hours a day.
Each time a module is removed, take time to inspect the fans.
1. 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.
2. Spin the fan blades with a pen or pencil to ensure that the bearings are free and the fan is still
in balance.
After 10% of the fans have been replaced, we recommend replacing all fans to reduce associated
maintenance costs that may incur with increased heat buildup from fan failure.
A fan testing power cord is available for checking fan operation. Plug the test cord into the
questionable fan and plug the other end into a 110-volt outlet. If the fan does not turn or does not
operate smoothly, replace it. Use extreme caution during this testing, since the fan blades are exposed!
K
Note: If the display is not in operation, turn power off to conserve energy and extend the life of
both the fans and electronic components.
9.10 Lens Airflow
Check airflow through the lenses
periodically to ensure there are no
obstructions in the lens exhaust holes.
Airflow is necessary to cool the lenses
and lamps adequately (refer to Figure 7).
The interior of the module should be kept
clean to prevent a buildup of dust on the
lenses. Use an air hose and a vacuum
cleaner to keep the display clean.
Inspect the cabinet seal periodically to
make certain it is sealing properly. If
leaks are detected, repair or replace the
pile weatherstripping seal in the area
where the leak occurred. Use the
following method to check both the
airflow through the lenses and the cabinet
seal:
Figure 7: Lens Airflow