Daktronics Galaxy AF-3400 20 mm Monochrome/RGB Double-face Displays - Manual (Page 37)

Maintenance
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6.2 Ventilation System/ Fans
Frequency of Inspection
Ventilation fans are located on the bottom of the display. They pull
air into the cabinet from the lower vent, exhausting it out the top
vent (Figure 30).
Fans should be checked every time the display is opened for service
or at a minimum of annually. Fans should be checked more often if
the display is located in a dusty or harsh weather environment.
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.
Air Flow
To check the operation of the fans, open the display to expose the
thermostat in the top right corner of Face A behind the first
module (Figure 31). 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.
Check the intake and exhaust vents and remove any dust or
debris that may be obstructing air flow. Hold your hand or a
piece of lightweight paper in front of the vents to detect air
movement.
6.3 Annual Inspection
A yearly inspection should be completed to maintain safe and dependable display operation.
The display will need to be opened to visually inspect the cabinet interior and the
components. Refer to Section 6.1 for these directions. The inspection should address the
following issues:
Figure 30: Ventilation Fans
Figure 31: Thermostat
Inspection item Possible corrective measures
Loose bolts, screws, rivets Tighten or replace, as required
Water intrusion or stains
• Replace weather-stripping
• Tighten module latches
• Place silicon sealant around all locations
where water might enter
• Replace damaged electronic components
Paint corrosion by footings, tie
points, ground rods
• Check the metal for structural integrity.
• Replace and/or repaint as necessary.