Daktronics AB-1600-1.5,2.5 - Manual (Page 67)

Maintenance & Troubleshooting 4-25
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 to ensure that the fans are not operating when the display is not
running. 1,500 hours is equivalent to 62 days if the display is on running non-stop, 24 hours a day.
In addition to 1,500-hour maintenance, take a minute to inspect the fans after removing a lens/reflector
assembly.
1. 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 need more frequent changing. Keep fan blades clean to
maintain fan efficiency and ensure proper cooling.
2. Spin the fan blades with a pen or pencil to ensure that the bearings are free and the fan is still in
balance.
After replacing 10% of the fans, Daktronics recommends replacing all fans to avoid the increased
maintenance costs associated with inefficient fan operation.
A fan testing power cord is available for checking fan operation. Plug the test cord into the
questionable fan and plug the other end into a 110-volt outlet. If the fan does not turn or does not
operate smoothly, replace it.
¨
Use extreme caution during this testing! The fan blades are exposed!
Fan and filter maintenance take place at the same intervals – 1,500 hours.
Fans in Section 4.3 addresses fan removal and replacement.
L
Note: If the display is not in operation, turn power off to conserve energy and extend the life of
both the fans and electronic components.
4.9 Interior Maintenance
Do not allow dust and/or dirt to accumulate within the display cabinet. The fans can pick up debris
deposit it behind the lenses. This may restrict airflow out of the display and cause overheating
problems. Use an air hose and vacuum to keep the inside of the cabinet clean.
Occasionally, it is a good idea to check the airflow through the lenses using the “smoke test.” This is
especially true if the display controller is blanking the display but the cause of overheating is not
apparent.
Perform the smoke test in the following manner.
1. Light a smoke ball or similar smoke-producing device beneath a fan inlet.
2. Observe where the smoke exits the display. It should only exit through the lens exhaust ports. If
smoke exits from between two or more lens/reflector assemblies the weather stripping likely needs
replacing.
3. If smoke does not exit a particular group of lenses, remove the lenses to clean out any debris,
replace the lenses and retest. A failed fan may create an effect similar to that of clogged lens
exhaust ports.
4.10 Structural Maintenance & Inspection
Complete a yearly inspection to maintain safe and dependable display operation. This inspection
should address the following issues.