Power supplies, Ventilation systems, Power supplies -14 – Daktronics AF-3197-89-RGB User Manual
Page 58: Ventilation systems -14, 7 ventilation systems
Maintenance and Troubleshooting
4-14
Power Supplies
The LED power supplies are identified as assemblies 0A-1259-4410 for AF-3197
RGB displays. Each power supply controls two modules.
Complete the following steps to remove a power supply from the sign:
1. Open the module directly in front of the failed power supply.
2. Disconnect all the wires connected to the power supply.
3. Remove the hardware holding the power supply in place to free the unit.
4. Follow these steps in reverse order to install a new power supply.
5. Verify power supply voltage.
4.7 Ventilation
Systems
Check ventilation fans after 1,500 hours of operation and every 1,500 hours after that
to ensure the display cools properly. Check fans 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 operates for 18 hours a
day with the power to the display disconnected when not in use.
•
1,500 hours is equivalent to 62 days if the display runs non-stop for 24
hours a day.
Attention: Shut off power to the display when it is not in use. Leaving the power on
when the display is not operating exposes electrical components to excess
condensation, which shortens their life.
Each time you open the display, 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, change the filters more often. Keep the fan
blades 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 fan to detect air
movement. If the operation of a fan is questionable, a fan-test should be
performed
•
Press button on the internal thermostat and ensure they run freely.
•
If the fan does not turn or does not operate smoothly, replace it.