Daktronics AF-3400-133,171,216,260 - Manual (Page 34)

Maintenance and Troubleshooting 4-8
4.5 Ventilation System
Ventilation fans should be checked after 1,500 hours of operation and every 1,500
hours after that to ensure the display is being cooled properly. Fans 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).
• 1,500 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.
• 1,500 hours is equivalent to 62 days if the display is running non-stop for 24
hours a day. Each time a module is removed, for whatever reason, take a
minute to inspect the fans.
• Check the fan blades for dirt and debris. Fan blades must be kept 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, push the bypass button (momentary contact) on
the thermostat enclosure to temporarily turn the fans on (The bypass button is located
in the upper left hand corner).
• Hold your hand or a piece of light paper beneath the hoods to detect air
movement.
• If the fan does not turn or does not operate smoothly, replace it.
4.6 Thermostats
A thermostat controls the operation of the ventilation fans in the display. The
ventilation fans turn on when the inside of the display reaches 85
° F (29° C), and
turn off at 70
° F (21° C).
4.7 Weather Stripping
To ensure that the display is water shedding, weather stripping has been provided
around the top portion of the display. It is important that the weather stripping is
installed properly at all times or water may leak into the display and damage the
components.
4.8 Display Maintenance
A yearly inspection should be completed 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. Fasteners
should be checked and tightened or replaced 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.