Daktronics 4000 Series Digital Billboard - Manual (Page 33)

Annual Maintenance C hecks 27
Dis play Vis ual Ins pection
1. Visually inspect the display from ground level for module discoloration or other visual
issues. If you find any issues, contact a NOC technician by calling 1-866-325-8425 and
selecting #2 to recalibrate the display remotely to restore uniformity.
Dis play P ower
1. Verify the display is properly grounded. Measure the display grounding. It should
measure 10 Ohms or less. If display grounding reads more than 10 Ohms, improve
display grounding until it reads 10 Ohms or less.
2. Verify the voltage on each leg. If the voltage reading is not equal to 120V AC ± 5 V AC on
each leg, check the amperage in the displays breaker panels. Call a NOC technician to
discuss potential actions or solutions.
3. Verify breaker panels, termination panels and cable connections are secure.
C ompleting the Ins pection
1. Upon completing the inspection, call 1-877-325-4357 to speak with a Billboard Technician
who will request the findings, enter them into the system, and check for non-visual
diagnostic errors that need resolution.
7.2 C leaning a Dis play Face
Typically, it is not necessary to clean the display face. If the need arises, use one of the
methods below.
Required tools:
• Five-gallon bucket with cold water.
• Non-abrasive, non-petroleum based detergent.
• 4' – 8' telescoping, soft automotive brush. Daktronics recommends a 10" × 4" brush
head and a brush of light to medium stiffness.
• Soft terry cloth towels.
Wet C leaning Method
1. Turn off power to the display.
2. Mix mild detergent and cold water in the five-gallon bucket at a ratio of one ounce of
detergent to one gallon of cold water.
3. Clean only a section of modules that are safely within reach of the lift or stage, and then
move to the next section of modules.