Daktronics Galaxy AF-3500/3550 - Manual (Page 23)

Maintenance 19
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 thermostat in the
upper left-hand corner. Press the test button, shown in
Figure 15, to test fan operation. Some thermostats may
have the button on the bottom. If a fan does not rotate or
does not operate smoothly, replace it.
Make sure that the intake vents and exhaust vents on the
bottom front of the display 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.
Note: When mounting the display, the entire front must be exposed to allow for proper ventilation. Aesthetic
shrouding (common in monument
installations) is not advised. See
Figure 16 and
Figure 17 for examples.
6.4 Display Face Cleaning
Wet Cleaning Process
1. Turn off power to the display.
2. Mix a mild, non-abrasive, non-petroleum-
based detergent and cold water, one
ounce of detergent to one gallon of cold
water.
3. Saturate a light/medium duty cleaning
brush with the soapy water.
4. Use horizontal brush strokes to loosen and remove dirt and grime, washing the display from top to
bottom. Use light pressure so as not to damage the LEDs. Clean only an area that is safely within reach
from a lift or stage, and then move on to the next section of modules.
5. Rinse the display face with generous amounts of cold water under low pressure.
A spot-free rinse agent can be used to reduce water spots.
6. Use soft, dry terrycloth to dry and remove any excess water. Take care not to damage LEDs by catching
the cloth on them.
7. Allow the display to completely air-dry for 12 hours before applying power to the display.
Thermostat
Bypass
Switch
Figure 15: Fan Test Button
FRONT BACK
Figure 16: Restricted Airflow
FRONT BACK
Figure 17: Unrestricted Airflow