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6 MAINTENANCE
6.1 Cautions and Test Equipment List
6.1.1 General Precautions
During operation, extremely high voltages are present at the output
of the transmitter, anywhere in the vicinity of the antenna coupler,
and on the antenna itself. Carelessness in working around the
equipment can result in severe electrical shock.
When working with the equipment, follow standard correct service
procedure° Avoid working with the equipment while standing in a
wet area forming a good ground.
All other applicable safety
procedures should be utilized as much as possible.
Transistors may be damaged by careless or improper measuring
techniques, particularly when checking resistance. When measuring
voltages, insulate all the probe except the tip as a momentary short
circuit can destroy a transistor. Use a low wattage soldering iron,
as excessive heat can damage semiconductor components.
Use only low wattage irons when working with components mounted on
a PWB.
Insufficient care or excessive heat in soldering and
desoldering can lift component pads, thus destroying a PWB. Use
a Solder-Wick or equivalent when desoldering components.
6.1.2 Specific Precautions
When making low level measurements in the transmitter, if possible
operate the transmitter into the dummy Load. High level fields
associated with the antenna coupler and antenna system may induce
substantial signals into the test equipment, seriously compromising
the measurements being made.
Many of the transistors and diodes used in an SS-Series radiobeacon
are especially chosen for their particular circuit. Even if one
of these transistors does cross match to a general replacement type
(ECG, HEP, SK, etc.) these replacements MAY NOT substitute and
should not be used. Replacement power transistors should be ordered
from the factory in order to avoid the possibility of substantial
damage to the transmitter.
6.1.3 Test Equipment List
The following equipment is recommended for testing an SS-Series
transmitter:
SS-800AVS
Southern Avionics
109
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