Daktronics BA-515 - Manual (Page 41)

Replacing a Lampbank
When lampbanks are reattached to the lens assemblies, be certain the lamp sockets are seated
tightly against the reflectors. All four tabs, one in each corner, must be snapped securely onto the
lampbank. If the lampbank is not secured properly to the lens assembly, the lamp filament will not
be at the focal point of the reflector, and parts of that lens assembly will appear dim.
Replacing the Module
To reinstall a lens assembly in the display, refer to Drawing A-75204:
1. Reconnect power and signal connections to the lampbank.
2. Tilt the module about 30 degrees and place the bottom corners of the side brackets to the
inside of the frame verticals.
3. Push the lens assembly firmly back into place until the latches snap into place and the lens
assembly is secured to the display. It may be necessary to use a solid object, such as a
short length of 2"x4" lumber, to properly seat the assembly. Place the 2x4 across the
louvers so the pressure on them is evenly distributed and strike the board with the heel of
your hand. This should drive the assembly in place.
4. Pull firmly on the assembly to ensure that it is fully in place and secured to the display.
The lens assemblies must fit together tightly enough so the weatherstripping forms a seal
and prevents water from leaking between the lens assemblies and into the display. The
seal between the assemblies should be checked with a 0.032" feeler gauge.
5. Snap the lenses back into the faceplate of the lens assembly. If a lens is not replaced
properly, it is easily noticed. The lens removal tab or the lens itself will not be in
alignment with the other lenses or lens tabs.
6. Verify that the rows of louvers on the lens assembly are in proper alignment.
9.3 Lamp Testing and Replacement
Reference Drawing:
Lens Removal, Front Access. ................................................................. Drawing A-99898
This display is designed for easy lamp replacement with front access. Non-functioning lamps should
always be replaced prior to scheduled events, or as soon as possible, for best viewing.
A 3.58 W 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.
Daktronics-approved 3.58 W lamps have an estimated life of 17,000 hours if operated at 11.0
V. Always use Daktronics-approved lamps.
K Note: 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 and will not give the intended results.
A qualified individual who is capable of operating the controller equipment should do lamp
testing.
Display power must be OFF for lamp replacement.
TNMC Maintenance 9-3
and Troubleshooting