Harris Platinum HT EL 2000LS, Technical Manual

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Section V
Maintenance and Alignments
5.1
Introduction
This section provides preventive maintenance checks, cleaning
and corrective maintenance information for the Platinum™ Se-
ries BROADCAST TRANSMITTER. Maintaining a transmitter
consists of several phases:
Routine maintenance
Performance checks and adjustments
Control circuitry checks and metering calibration
Keeping proper station records
The information contained in this section is intended to provide
guidance to establish a comprehensive maintenance program to
promote operational readiness and eliminate downtime. Particu-
lar emphasis is placed on preventive maintenance and record
keeping functions.
5.2
Station Records
The importance of keeping station performance records cannot
be overemphasized. A logbook should be maintained for opera-
tion and maintenance activities. These records can provide data
for predicting potential problem areas and analyzing equipment
malfunctions.
5.2.1
Transmitter Logbook
As a minimum performance characteristic, the transmitter should
be monitored (using front panel meters) and the results recorded
in the transmitter logbook.
5.2.2
Maintenance Logbook
The maintenance logbook should contain a complete description
of all maintenance activities required to keep the transmitter
operational. A list of maintenance information to be recorded and
analyzed to provide a data base for a failure reporting system is
as follows:
DISCREPANCY
Describe the nature of the malfunction. Include all
observable symptoms and performance characteristics.
CORRECTIVE ACTION
Describe the repair procedure used to correct the mal-
function.
DEFECTIVE PART(S)
List all parts and components replaced or repaired.
Include the following details:
a. Component Part Number
b. Component Schematic Number
c. Component Reference Designator
d. Assembly Serial Number
5.2.3
Safety Precautions
It is very dangerous to attempt to make measurements or to
replace components with power on. Before attempting any meas-
urements or maintenance procedure, consider the voltage and
current hazards that may exist. It is very important to remove
primary power to the transmitter when AC mains voltage is
exposed. The information and procedures in this section is to be
used by trained and experienced personnel. Good judgement,
alertness and common sense are the best accident preventives.
5.3
Preventive Maintenance
Preventive maintenance is a systematic series of operations per-
formed periodically on equipment. As these procedures cannot
be applied indiscriminately, specific instructions are necessary.
a. Visual Inspection. Inspection is the most important pre-
ventative maintenance operation because it determines the
necessity for the others. Become thoroughly acquainted
with normal operating conditions in order to recognize and
identify abnormal conditions readily. The remedy for most
visible defects is obvious. However, care must be taken if
heat damaged components are located. Overheating is
usually a symptom of trouble. It is essential to determine
the actual cause of overheating before the heat damaged
component is replaced, otherwise the damage will be re-
peated. Inspect for the following:
1. Overheating, indicated by discoloration, bulging of
parts and peculiar odors.
2. Oxidation.
3. Dirt, corrosion, rust, mildew and fungus growth.
b. Feel. Check parts for overheating, especially rotating parts
such as the blower motor. The need for lubrication, the lack
of proper ventilation, or the existence of some defect can
be detected and corrected before serious trouble occurs.
Become familiar with operating temperatures in order to
recognize deviations from the normal range.
c. Tighten. Tighten loose screws, bolts, and nuts. Do not
tighten indiscriminately as fittings that are tightened be-
yond the pressure for which they are designed may be
damaged or broken.
d. Clean. Clean parts when inspection shows that cleaning is
required.
e. Adjust. Make adjustments when inspection shows that
adjustments are necessary to maintain normal operation.
f. Lubricate. The fans in this transmitter have sealed bear-
ings that do not require lubrication. There are no other parts
requiring lubrication.
g. Paint. Paint surfaces with the original type of paint (use
prime coat if necessary) when inspection shows rust, worn
or broken paint film.
5.3.1
Air Filter Maintenance
A disposable air filter is used for cabinet air filtration. They must
changed as necessary to allow sufficient cooling air flow.
888-2457-001 5-1
WARNING: Disconnect primary power prior to servicing.