
9-6
TNMC Maintenance
and
Troubleshooting
1500 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. 1500 hours is equivalent to 72 days if the display is on running non-stop, 24 hours a day.
It is recommended that spare filters be kept on hand at all times. Ideally, all filters should be replaced
during routine maintenance. If a filter media shows evidence of damage or wear, replace the filter with
a Daktronics filter. If a filter other than the Daktronics standard filter is used, follow these criteria: refer
to
Section 9.14
for the part number of the filter.
1.
Effective filter area should be no less than 2.3 square feet per 1.0 square feet of face area; and
2.
Filter media to have an average arrestance of 90-92 percent.
Once the filters have been replaced, turn power back on. Note if the fans are turning properly.
L
Turn the power OFF when you have finished 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 cool the lenses and lamps adequately. 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 around the edges of the cover.
A method for checking both the airflow through the lenses and the cabinet seal is as follows: 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 leaking 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-inch 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 weather-stripping is providing a tight fit around the
perimeter of the rain shield.
6.
Replace the filter cover plate if that was removed (front access).
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