Daktronics AF-3090-89-R,A - Manual (Page 34)

Maintenance &
Troubleshooting
4-9
4.8 Ventilation Systems
Check ventilation fans after 1,500 hours of operation and every 1,500 hours after that to ensure the
sign cools properly. Check fans more often if the sign is located in a dusty or harsh weather
environment (i.e. along a gravel road with dust laden air).
• 1,500 hours is equivalent to 83 days if the sign operates for 18 hours a day with the power to the
sign disconnected when not in use.
• 1,500 hours is equivalent to 62 days if the sign runs non-stop for 24 hours a day.
L
Attention: Shut off power to the sign when it is not in use. Leaving the power on when the sign is
not operating exposes electrical components to excess condensation, which shortens their life.
Each time you open the display, for whatever reason, 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 sign 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.
4.9 Thermostats
Reference Drawings:
Display Assembly................................................................................................Appendix A
A thermostat controls when the ventilation fans operate in the sign. Refer to the Display Assembly
drawing for the location of the thermostat. The ventilation fans turn on when the inside of the fan
reaches 85
°
F (29
°
C), and turn off at 70
°
F (21
°
C).
4.10 Sign Maintenance
Perform a yearly inspection to maintain safe and dependable sign 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 sign cabinet to remove dust/dirt
buildup that may interfere with airflow.
• Water Intrusion – Water Stain Marks
Water can enter the sign where weather stripping has come loose or deteriorated or 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.