User's Manual Part 3

Maintenance and Servicing - 152 -
Affinity® LBD-200C-N1 Transmitter
Product Manual
rather than removing it. Use a small brush to dislodge dirt while using the vacuum to remove it.
Where practical, use cloth to wipe dirty surfaces. Clean the fans that pull air through the
transmitter. The amount of air that the fan can move is reduced if the impellers are dirty. Clean
the motors; dirt may accumulate on the windings and bearings that can increase the operating
temperature and decrease the life of the motor.
23.4.2 Semi Annual Maintenance
Perform these checks on a semi-annual schedule:
Plug-In Module Cleaning Procedure
This cleaning procedure is applicable to all the Affinity® plug-in modules.
NOTE: When plug-in modules are removed during the cleaning process there will be an
interruption in service. Returning the module to the sub-chassis will restore service.
This note does not apply to the Power Amplifier Segments (PAS). The amplifier segments may
be removed one-at-a-time for cleaning with the power attached. Removing an amplifier during
this cleaning procedure will cause a reduction in transmitter power until the amplifier is again
secured
x Remove the plug-in module by loosening the thumbscrew and sliding the module
out of the sub-chassis.
x Remove the side “snap-on” covers if required.
x Gently vacuum or dust inside the plug-in.
x Clean the outside covers and front panel using a damp (NOT WET) non-abrasive
cloth, and a mixture of mild detergent and water.
x Ensure that the plug-in module is COMPLETELY dry before plugging it back into the
sub-assembly.
x Tighten the thumbscrews
Power and Grounding Audit
The first step to avoiding power quality problems is to check the AC distribution and grounding
system for missing, improper, or poor connections. It is important to check the complete
grounding system from the source to the load. Checking the grounding system ensures that the
voltage drops are within acceptable limits and the ground connections are proper.
Wiring and Grounding Problems
When a neutral-to-ground connection is made at the load side of the equipment, the feeder
neutral current will divide and return on both feeder metal raceway and feeder neutral
conductor. When an AC current travels on the metal enclosure of the equipment, an
electromagnetic field is produced, which is not desirable. Grounding and wiring problems can
arise from inconsistencies in equipment installations, such as:
x Different parts of the industrial set-up were built during various time schedules.