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TNMC Troubleshooting & Maintenance 41
Weather-stripping
To ensure that the display is waterproof, weather-stripping has been installed around each
module. It is important that the weather-stripping is attached properly at all times, or water
may leak into the display and damage the components.
When installing a new module, take note of the following points:

The weather-stripping on the back edge of the module must be intact and in good
condition to prevent water from seeping into the display.

The module latches must be fully engaged to create a watertight seal around the edge
of the module. The module should be firmly seated against the display when the
latches are fully engaged.
6.8 Power Supplies
Power supply configurations will vary depending on the number and/or color of modules.
Replacing a Power Supply
To remove a power supply from the display:
1. Access the internal components using the appropriate Front/Rear Access method
described in Section 6.5 .
2. Disconnect all the wires connected to the power supply.
3. Loosen the screw securing the power supply and slide it out of the display cabinet.
Note: In displays built before September 2009, use a 9/32" nut driver to remove the
hardware securing the power supply.
4. Fasten the new power supply in place and reconnect all wires.
6.9 Display Maintenance
Complete a yearly inspection to maintain safe and dependable display operation.
This inspection should address the following issues:

Loose Hardware : Verify that fasteners, such as bolts and rivets, have not come loose.
Check and tighten or replace fasteners as required.

Excessive Dust Buildup: It may be necessary to occasionally vacuum the inside of
the display cabinet to remove dust/dirt buildup that may interfere with airflow.

Water Intrusion – Water stain marks: Water can enter the display where weather-
stripping has come loose or deteriorated; where fasteners have come loose, allowing
gaps in the panels; or where moisture may be entering around hardware. Check
electronic components for corrosion.

Corrosion: Check the paint, and look for possible corrosion, especially at footings,
structural tie points, and ground rods and other types of grounding electrodes.
Note: If any of the preceding conditions are discovered, make the necessary repairs
or take corrective action immediately.