
TNMC Maintenance
and Troubleshooting
9-5
Weatherstripping Maintenance
The top and bottom of each 8x16 lens assembly has a strip of pile weatherstripping (refer to
Section 9.14
for the part number). There is tape weatherstripping between each louver assembly
(refer to
Section 9.14
for the part number). The weatherstripping helps keep moisture out of the
display and maintains the positive air pressure necessary for proper display cooling. When doing
routine display maintenance, which involves removing the 8x16 lens assemblies, make sure the
weatherstripping is intact. If any weatherstripping appears damaged, replace it. Refer to the
following instructions and
Drawing A-91100
.
1.
Once the old weatherstripping has been removed, clean the top and bottom of the lens
assembly with an adhesive remover so the new weatherstripping will adhere.
2.
The weatherstripping should be applied in one continuous strip on both the top and bottom
of the lens assembly.
3.
When finished, the stripping should be flush at the bottom. If the weatherstripping is not
tight or buckles anywhere on the lens assembly, it will be difficult to reinstall it in the
display, and it will allow water to enter the display and damage the electrical components.
4.
Check the module spacing and weatherstripping tightness with the 0.032" feeler gauge.
Louver Maintenance
If display louvers become bent or damaged, they must be replaced. The lens/reflector assembly
containing the damaged louvers should be returned to Daktronics for repair or replacement.
9.6
Lamp Module Transformer
Displays with team name message centers are shipped with transformers which, when wired to the 120
volt tap with a line voltage of 120 volts, will deliver 11.0 volts to the lamp. Lamp life is estimated to be
17,000 hours with this transformer. Refer to
Section 9.14
for the correct part number for the
replacement transformer
Due to input line voltage variations from site to site, the resultant lamp voltages may vary, which may
greatly alter lamp life.
If the measured input line voltage is over the particular transformer rated input voltage, increased
voltage will be delivered to the lamp, which will greatly reduce lamp life.
The transformer is capable of adjustment both up and down if line voltage varies enough to greatly alter
lamp life/lamp brightness.
If adjustments to the transformer are required, contact Daktronics Customer Service.
9.7 Fan
Filters
Reference Drawing:
Filter Removal; 250 CFM Fan.................................................................
Drawing A-113986
Shrouds are provided on the rear of the display to house the fan filters and shed rain. Filters must be
checked every 1500 hours of operation for accumulation of debris that could restrict airflow.
Check filters after the display has been in operation for 1500 hours—and every 1500 hours after that—
to ensure that the display is being cooled properly. Filters should be checked more often if the display is
located in a dusty or harsh weather environment (i.e. along a gravel road with dust-laden air).
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