Daktronics AB-1600-1.5,2.5 - Manual (Page 70)

Maintenance & Troubleshooting 4-26
16. Apply new weather stripping to lens/reflector assembly as explained in Section 4.13.
17. Reattach both the lampbanks to the back of the lens/reflector assembly as explained in Section
4.6.
18. Remount the lens/reflector assembly in the cabinet as explained in Section 4.3.
4.15 Interior Maintenance
Do not allow dust and/or dirt to accumulate within the display cabinet. The debris can be picked up and
deposited 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 wise 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.
The smoke test is performed 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.
4.16 Structural Maintenance & Inspection
A yearly inspection should be completed to maintain safe and dependable display operation. This
inspection should address the following issues.
•
Corrosion
Check the paint and look for corrosion, especially at footing, structural tie points and ground rods.
•
Loosened Hardware
Verify fasteners, such as bolts and rivets, have not come loose. Fasteners should be checked and
tightened or replaced as required.
•
Water Stains
Check the inside of the cabinet for any signs of water intrusion. Pay special attention to the area
around the eyebolt holes
•
Electrical Components
Check all electrical components closely for signs of corrosion.
If noticing any of the above conditions, take action to correct the situation.