Daktronics Galaxy AF-3050 Series, Display Manual

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Maintenance and Troubleshooting
4-6
t Light De ector
The light detector is internally mounted and wired at Daktronics. It is located in the bottom left
corner on the front of the display (identified as assembly 0A-1215-4001 (LT)). A 4-conductor
cable is used to connect the light detector to the controller board. The cable is terminated at the
terminal block on the light sensor and at TB7 on the controller board (refer to
Figure 13 on
page 4-6 ).
Light Detector
Pin No.
Cable Wires
Color
Controller Board
Pin No.
1 Green 3
2 White 4
3 Red 1
4 Black 2
N.C. Bare 2
4.5 Thermostats
A thermostat controls when the ventilation fans are turned on in the display and are located behind the
second top module (A102).
4.6 Ventilation Systems (With Fans and Filters)
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. ·
Attention: Power to the display should be shut off when the display is not in use. If the power is left
on when the display is not operating, the filters will require cleaning or replacement more often, and
electrical components will be exposed to excess condensation, which shortens their life.
Each time a module is removed, for whatever reason, take a minute to inspect the fans.
· Check the fan blades for dirt and debris. If the fan blades have a large accumulation of dirt and
debris, this indicates that the filters must be changed more often. 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:
· Hold your hand or a piece of light paper beneath the sign to detect air movement. If the operation
of a fan is questionable, a fan-testing power cord is available to check it.
· Plug the test cord into the fan and plug the other end into a 120-volt outlet.
· If the fan does not turn or does not operate smoothly, replace it.
Filters must be checked once a year or after every 1,500 hours of operation, whichever comes first.
Filters can be cleaned with water and a mild detergent, such as dish soap. Compressed air can also be