Daktronics Galaxy AF-3500 Series Double Face - Manual (Page 19)

Maintenance 15
Frequency of Inspection
Check fans every time the display is opened or at a minimum of once every three months. Check more often
if the display is located in a dusty or harsh environment, such as along a gravel road.
Inspection frequency varies greatly from display to display as no two display installations are exactly the
same. Daktronics advises users and service technicians use their discretion when establishing an inspection
schedule.
Fan Blades
Check the fan blades for dirt and debris. Clean them and the inside of the display if necessary 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 that the fan is in balance.
Filters
Below each intake fan is a filter tray. Each time the fans are inspected, the filters must also be inspected; clean
or replace them when necessary.
To access the filter(s), press upward firmly on the tab located on the bottom front of the tray and pull
outward.
Clean filters with water or compressed air (no greater than 60psi and at least 6" away) blown through the
filter in the opposite direction from which air normally flows. Allow filters to dry before returning them to
their trays. Again, Daktronics encourages users and service technicians to use their own discretion when
deciding whether to clean or replace the filters.
Note: Air is drawn upward through the filter. Be sure to check the bottom of the filter as this will be the side
that requires cleaning.
Fan Test
Once the display’s internal components
reach a certain temperature, the fans are
activated. If the fans are not operating, they
may be checked by bypassing the temperature
controls. To check the operation of the fans,
open the display to expose the controller.
Refer to Figure 12 for an example. Push and
hold the bypass button on the controller board
to temporarily turn on the fans. The test button
is shown in Figure 17. If a fan does not rotate
or does not operate smoothly, replace it.
Make sure that the intake vents of Face A and
exhaust vents of Face B are not blocked and
are free of dust or other debris. Hold a piece of
lightweight paper in front of the bottom edge
(under the filter trays) of the display to detect
air movement through the vents. Intake vents
should pull the paper toward the display
while exhaust vents should push the paper
away.
Note: When mounting the display, the entire
front of the display must be exposed to allow for proper ventilation.
S1
S1
ADDRESS
UPPER LOWER
0
8
0
8
Figure 16: Fan Test Button