Daktronics BA-515 - Manual (Page 45)

As noted previously, 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. (This ensures that the fans are not operating
when the display is not running.) If the displays is running non-stop, 24 hours a day, 1,500 hours is
equivalent to 62 days.
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 percent of the fans have been replaced, Daktronics recommends 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 V 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.
TNMC Maintenance 9-7
Inspect the cabinet seal periodically
to make certain it is sealing
properly. If leaks are detected,
repair or replace the pile weather
stripping 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
1. Direct smoke toward the fan inlet and observe where the smoke exits.
2. Check all around the cabinet and the lenses.
3. If smoke does not exit a particular group of lenses, remove the lenses to clean out any debris,
replace the lenses and re-test.
and Troubleshooting