Daktronics BA-515 - Manual (Page 44)

Once the filters have been replaced, turn power back on. Make sure that the fans are turning properly.
K Note: Turn the power OFF after checking the fans.
Periodically check airflow through the lenses to ensure that there are no obstructions in the lens
exhaust holes. Airflow is necessary to adequately cool the lenses and lamps. Keep the interior of the
module 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 you
detect leaks, repair or replace the pile weatherstripping seal around the edges of the cover.
Used this method for checking both the airflow through the lenses and the cabinet seal:
Direct smoke toward the fan inlet and note where the smoke exits.
Check all around the cabinet and the lenses. If smoke does not exit a particular group of
lenses, remove the lenses to clean out any debris, replace the lenses and retest.
9.8 Filter Removal
Reference Drawing:
Filter Removal; 250 CFM Fan ............................................................... Drawing A-113986
Follow the steps on Drawing A-113986 to remove the filter from the scoreboard. Check the fan as
follows:
1. Inspect the filter and determine if it should be replaced or cleaned.
2. Inspect the filter assembly perimeter gasket for evidence of deterioration or air leakage around
or through the gasket. The factory-applied gasket is at the top of the rain shield assembly and
to the front of the filter holder. The gasket is also on the 16" sides of the filter. If any part of
the gasket material is damaged and needs to be replaced, refer to Section 9.14 for the part
number of the gasket material.
3. Insert a filter into the filter holder.
4. Inspect the filter assembly. Make certain that the filter is touching the inside of the frame
throughout its entire length and that no air gaps exist. Ensure that the filter assembly is set
inside the channel on the topside and is resting in the filter holder. Make sure that the filter
wire side is up.
5. Inspect the filter holder to ensure the weatherstripping is providing a tight fit around the
perimeter of the rain shield.
6. Replace the filter cover plate if that was removed (front access).
9.9 Fans
Fans are provided to control the heat buildup generated by the electronic components. One cooling fan
is provided for every 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).
9-6 TNMC Maintenance
and Troubleshooting