Daktronics AF-3400-64-R,A - Manual (Page 36)

Maintenance and Troubleshooting 4-8
Each time you open the display, take a minute to inspect the fans:
• Check the fan blades for dirt and debris. If the fan blades have a large
accumulation of dirt and debris, change the filters more often. Keep the fan
blades clean to maintain fan efficiency and ensure proper cooling.
• Spin the fan blades with a pen or pencil to ensure that the bearings are free
and the fan is still in balance.
To check the operation of the fans:
• Hold your hand or a piece of light paper beneath the display to detect air
movement. If the operation of a fan is questionable, a fan-test should be
performed.
• Press button on the internal thermostat and ensure they run freely.
• If the fan does not turn or does not operate smoothly, replace it.
4.7 Thermostats
Reference Drawings:
Shop Drawings .........................................................Refer to Appendix A
A thermostat controls when the ventilation fans operate in the display. Refer to the
correct Shop Drawing for the location of the thermostat. The ventilation fans turn on
when the inside of the display reaches 85
° F (29° C) and turn off at 70° F (21° C).
4.8 Display Maintenance
Perform a yearly inspection to maintain safe and dependable display operation. This
inspection should address the following issues:
• Loose Hardware
Verify fasteners, such as bolts and rivets, have not come loose. Check,
tighten, and replace fasteners as required.
• Excessive Dust Buildup
Occasionally it may be necessary to vacuum the inside of the display
cabinet to remove dust/dirt buildup that may interfere with airflow.
• Water Intrusion – Water Stain Marks
Water can enter the display where weather-stripping has come loose or
deteriorated, where fasteners have come loose allowing gaps in the panels,
or where moisture may be entering around hardware. Check electronic
components for signs of corrosion.
• Corrosion
Check the paint; look for possible corrosion, especially at footings,
structural tie points, and ground rods.
If you notice any of the above conditions, take action to correct the situation.