Daktronics AB-1600-1.5,2.5 User Manual
Page 42
Maintenance & Troubleshooting
4-6
To remove a back sheet from a rear accessible display, complete the following steps.
1. Remove all back sheet screws with a battery-powered screwdriver using a
5
/
16
l hex bit.
2. Lift the back sheet up and slightly away from the display.
3. Reach behind the back sheet and unplug the fan power wires if present.
4. Pull the back sheet entirely away from the display.
Rear Accessible Displays – Removing a Module
If removing a lens/reflector assembly from a rear accessible display, complete the following
steps while referring to Figures 41 and 42.
Note: A lens/reflector assembly does not need to be removed in order to replace a lamp or to
remove a lampbank in most cases in a rear accessible display; refer to Section 4.7.
CAUTION: When removing an 8 by 16 module from the rear of the display, follow the
safety lanyard procedure. The use of a safety lanyard will prevent the module from falling
and causing damage or injury. Post a safety lanyard procedure list on each level of the
catwalk. A copy of this procedure is in Appendix B.
1. After removing the back sheet from the rear of the display, disconnect all power and signal
harness connections from the lampbank.
2. Place a safety lanyard snap into any one of the three holes in one of the side brackets of the
lens assembly.
3. Loop the safety lanyard around the conduit and secure the remaining snap into one of the
three holes in the bracket on the other side of the lens assembly.
4. Insert the tool (0M-95441) into the
area just below the lampbank-
positioning tab of the side bracket
at a slight angle (refer to Figure
43). The tool will work best if
positioned with the notched side up.
5. Slowly turn the tool downward so it
pushes down on the lens assembly-
retaining latch.
6. Gently push the corner of the lens
assembly out of the display, just far
enough (about a half-inch) to
prevent the latches from springing
back into place.
Figure 43: Inserting the Tool to Release the Lens
Assembly Retaining Latch.