LBI-3899
MAINTENANCE
PREVENTIVE MAINTENANCE
NOTE
To ensure high operating efficiency, and to prevent mechanical and electrical failures from interrupting system operations,
routine checks should be made of all mechanical and electrical equipment at regular intervals. This preventive maintenance
should include the checks as listed in Table 1, Maintenance Checks.
Table 1 - Maintenance Checks
MAINTENANCE CHECKS
CONNECTIONS - Ground connections and connections to the voltage source
should be periodically checked for tightness. Loose or poor connections to the
power source will cause excessive voltage drops and faulty operation. When
ground connections are not made directly to the battery, the connection from
the battery to vehicle chassis must be checked for low impedance. A high
impedance may cause excessive voltage drops and alternator noise problems.
Every
6
months
ELECTRICAL SYSTEM - Check the voltage regulator and alternator or
generator periodically to keep the electrical system within safe and economical
operating limits. Overvoltage is indicated when the battery loses water
rapidly. Usage of 1 or 2 ounces of water per cell per week is acceptable for
batteries in continuous operation. A weak battery will often cause excessive
noise or faulty operation.
As
Required
MECHANICAL INSPECTION - Since mobile units are subject to constant
shock and vibration, check for loose plugs, nuts, screws, and parts to make
sure that nothing is working loose. Be sure that all screws are properly
torqued.
Every 6
months
ANTENNA INSPECTION - The antenna, antenna base, and all contacts
should be kept clean and free from dirt or corrosion. If the antenna or its base
should become coated or poorly grounded, loss of radiation and a weak signal
will result.
Every 6
months
ALIGNMENT - The transmitter and receiver measurements should be
checked periodically. Refer to the applicable Alignment Procedure and
troubleshooting sheet for typical voltage readings.
As
Required
FREQUENCY CHECK - Check transmitter frequency and deviation, as
required by the FCC. Normally, these checks are made when the unit is first
put into operation, after the first six months, and once a year thereafter.
As
Required
3
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