9-2 TNMC Maintenance
and Troubleshooting
9.2 Service Procedures
Reference Drawings:
Lens Removal, Front Access.................................................................... Drawing A-99898
Lens Assy Removal, Front........................................................................ Drawing A-99899
Correct Lens Position, 1 2" ....................................................................... Drawing A-75204
Removing a Module
For many maintenance or repair procedures, the first step is to remove a module. Each 8x16 lens
assembly is secured to the frame by two spring-loaded latches, one on each side. Follow these
instructions for access to these latches:
1. Remove the lens from row 4, column 1, and the lens from row 4, column 16 of the lens
assembly. Refer to Drawing A-99898.
2. Place the front access tool into the latch access hole. The angled edge of the tool should be
down so it wedges the latch pin down as it is pushed further into the access hole. Refer to
Section 9.14 for the part number of the access tool.
3. When the front access tool is fully inserted, the module latches should be released (refer to
Figure 6).
4. With the latch released, pull the lens assembly slightly away (about a half-inch) from the
display. This will prevent it from re-latching. Refer to Drawing A-99899.
5. Repeat this procedure with the remaining side.
6. With both sides unlatched, the assembly should pull away from the display far enough so
the signal and power harness can be disconnected from the lampbank. When the signal and
power harnesses are removed, the module can be removed from the display.
Note: A
3
/
16
" slotted screwdriver may be used in place of the access tool.
Figure 6: Removing a Module
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