Daktronics AB-1600-1.5,2.5 - Manual (Page 49)

Maintenance & Troubleshooting
4-5
5. While holding the screwdriver handle to the side, pull this side of the assembly out about an inch.
This will pull it free of the latch and prevent it from snapping back into a locked position.
6. Perform steps 2-4 to free the opposite the opposite side of the assembly.
CAUTION: The lens/reflector assembly is now held in place by only a few ribbon cables.
Do not let the assembly fall from the cabinet.
7. Pull the assembly out of the display far enough to disconnect all ribbon cables and power
connectors from the lampbanks mounted on the assembly’s backside. The assembly is now
completely free of the cabinet.
Complete the following steps to replace or install a lens/reflector assembly in a front
accessible display.
1. Reconnect all ribbon cables and power connectors to the lampbanks on the back of the assembly.
2. Slide the lens/reflector assembly back into position in the cabinet. A firm push should be all that is
needed to lock the assembly into position. Give a tug to the assembly to verify that it is firmly
locked in place.
3. If necessary, replace any lenses as explained in Section 4.3.
If one or both sides of the lens/reflector assembly fail to lock into position after repeated attempts take
the following steps.
1. Hold a section of 2x4 board vertically against the louvers on the stubborn side of the assembly.
2. With the heel of the other hand strike the board
3. Give a tug to the assembly to verify the assembly is locked in place.
Do not pound on the board with a hammer or similar device. This will damage the louvers.
Rear Accessible Displays – Removing Back Sheets
Rear accessible displays require back sheets be removed from the rear of the display in order to
reach the internal display components.
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
” 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.
If a lens/reflector assembly needs to be removed from a rear accessible display,
complete the following steps while referring to Figure 44 and Figure 45.
Note: A lens/reflector assembly may not need to be removed in order to replace a lamp
or lamp bank in a rear accessible display; refer to Section 4.6.