Daktronics BA-515 - Manual (Page 42)

Individual Lamp Replacement
Grasp the tab on the top center of the lens with the lamp-extracting tool (refer to Drawing A-
99898). Pull the tab out and down, and at the same time, with your other hand, 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.
1. Remove the defective lamp using the lamp-extracting tool.
2. Replace defective lamps with Daktronics approved lamps of the same wattage. Refer to
Section 9.14 for the correct replacement lamps.
3. 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, since 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 for more information.
9.5 Lens/Reflector Assembly Maintenance
Reference Drawing:
Lens Assy, Weather Stripping Location ...................................................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 require replacement.
Weatherstripping and louver replacement are addressed in the following subsections.
Weatherstripping Maintenance
The top and bottom of each 8x16 lens assembly has a strip of pile weatherstripping. There is also
tape weatherstripping between each louver assembly. The weatherstripping helps keep moisture
out of the display and maintains the positive air pressure necessary for proper display cooling.
When doing routine display maintenance, which involves removing the 8x16 lens assemblies,
make sure the weatherstripping is intact. If any weatherstripping appears damaged, replace it.
Refer to the following instructions and Drawing A-91100. Refer to Section 9.14 for part
numbers.
1. Once the old weatherstripping has been removed, clean the top and bottom of the lens
assembly with an adhesive remover so the new weatherstripping will adhere.
2. The weatherstripping should be applied in one continuous strip on both the top and
bottom of the lens assembly.
9-4 TNMC Maintenance
and Troubleshooting