Daktronics Galaxy AF-3400 34 mm Monochrome/RGB - Manual (Page 39)

6.2 Ventilation System Maintenance
Frequency of Inspection
Figure 28: Air Exhaust in
Small Displays
Ventilation fans are located either on the bottom or the back of
the display. If fans are on the bottom, air is pulled into the
cabinet, venting out the top front (Figure 28). If fans are located
on the back, air is pulled out the back of the display (Figure 29).
Fans should be checked every time the display is opened or
annually 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).
Fan Blades
Check the fan blades for dirt and debris, cleaning them and the
inside of the display if necessary. Fan blades must be kept clean
to maintain fan efficiency and to 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.
Figure 29: Air Exhaust in
Larger Displays
Air Flow
To check the operation of the fans, open the display to expose
the thermostat in the top left corner of the cabinet behind the
first module (Figure 30). Push the bypass button on the
thermostat enclosure to temporarily turn on the fans. If a fan
does not rotate or does not operate smoothly, replace it.
Make sure that the intake and exhaust vents are not blocked
and are free of dust or other debris. Hold your hand or a piece
of lightweight paper in front of the vents to detect air
movement.
Figure 30: Thermostat
Maintenance
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