Daktronics AB-1600-1.5,2.5 - Manual (Page 59)

Maintenance & Troubleshooting
4-23
4.16 Line Filters
Line filters, as illustrated in Figure 58, are used in conjunction with data distributor displays and
remove electromagnetic noise from the power system that might otherwise interfere with local
communications channels. Line filters sometimes mount on brackets or power supplies. Generally,
each line from the panelboard will pass through a line filter.
The white, black and green wires from the panelboard connect to the filter on the “LINE” end. Notice
how the green ground wires is first routed to the ground lug before connecting to the line filter. The
white and black wires to the display electronics connect on the “LOAD” end.
On Daktronics drawings, a “Z” followed by the filter number indicates line filters.
To remove a line filter disconnect the power wires from the filter and remove the two nuts that hold
the unit to its bracket.
4.17 Weather Stripping Maintenance
Reference Drawings:
Lens/Reflector Assy, 816-10.................................................................. Drawing A-91100
The top and bottom of each 8x16 lens assembly has a strip of pile weather stripping (Daktronics part
number HS-1149). There is tape weather stripping between each louver assembly (Daktronics part
number HS-1051). The weather stripping 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 weather stripping is intact. If any
weather stripping appears damaged, replace it. Refer to the following instructions and Drawing A-
91100.
1. After removing the old pile weather stripping, clean the top and bottom of the lens assembly with
an adhesive remover so the new weather stripping will adhere.
2. Apply the weather stripping in one continuous strip on both the top and bottom of the lens
assembly.
3. When finished, the weather stripping should be flush at the bottom. If the weather stripping is not
tight or buckles anywhere on the lens assembly, it will be difficult to reinstall it in the display,
and it will allow water to enter the display and damage the electrical components.
4. Check the module spacing and weather stripping tightness with the 0.032” feeler gauge as
follows:
Figure 58: Line Filter