Daktronics BA-1518 - Manual (Page 45)

9-4 TNMC Maintenance
and Troubleshooting
A 3.58-watt lamp is positioned behind each lens. Use the controller lamp test to locate bad lamps. Refer
to Section 9.14 for the part numbers of replacement lamps and lenses.
l Display power must be OFF for lamp replacement.
l Always use Daktronics-approved lamps. Daktronics-approved 3.58-watt lamps have an
estimated life of 17,000 hours if operated at 11.0 volts. Lamps purchased from Daktronics are
built to tighter specifications than similar lamps built in standard production. The
recommended lamps give the sufficient intensity and beam spread to match the display design.
Lamps not built to Daktronics specifications will not perform as well, will not give the intended
results, and will adversely affect the beauty of the display.
l A qualified individual who is capable of operating the controller equipment should do lamp
testing.
Individual Lamp Replacement
1. Grasp the tab on the top center of the lens with the lamp-extracting tool (refer to Drawing
A-99898).
2. Pull out and down on the tab, while using your other hand to lightly press up on the louver
directly above the lens to be removed. Do not press up on the louver any further than
necessary or the louver may become deformed.
3. Remove the defective lamp using the lamp-extracting tool.
4. Replace defective lamps with Daktronics approved lamps of the same wattage. Refer to
Section 9.14 for the correct replacement lamps.
5. Noting proper lens orientation, snap the lens back into the lens/reflector assembly (refer to
Section 9.4)
9.4 Lens Position and Sequence
Reference Drawing:
Lens Removal, Front Access.................................................................... Drawing A-99898
The slot in the bottom of the reflector accommodates the lens indexing tabs. To insert a lens, set the
lens tabs into the reflector slots and snap the lens up into the vertical position. Make sure that the lens
is snapped in and behind the upper louver offset
Inspect the profile of the lenses to ensure that all lenses are secured properly. Lenses that are not
secured properly can be easily noticed, as the lens removal tab or the lens itself will not be in alignment
with the other lenses or lens tabs in that row. Refer to Drawing A-99898.
9.5 Lens/Reflector Assembly Maintenance
Reference Drawing:
Lens Assy, Weather Stripping ...................................................................Drawing A-91100
The lens/reflector assemblies are maintenance free; however, each time an assembly is removed from
the display the pile weatherstripping should be checked for signs of deterioration. The weatherstripping
runs along the top and sides of each lens/reflector assembly. In addition, over time, the louvers on the
front of lens/reflector assembly may become damaged and need replacing. Weatherstripping and louver
replacement are addressed in the next two subsections.