AR 10027190, Руководство по эксплуатации и обслуживанию

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Rev – 27
4. MAINTENANCE
The TWTA does not require routine scheduled maintenance . The only moving parts are the elements of
switches, relays and blowers. Preventive maintenance is recommended in Paragraph 4.3.
The TWTA is basically a factory repairable unit . However , since limited logic schematics and partial parts
information is supplied in this manual (Section 5) some user service organizations may choose to perform
their own corrective maintenance
. Warnings and Cautions should be observed.
4.1 SAFETY WARNING
WARNING:
Only technicians thoroughly familiar with the high voltages present in
microwave tube amplifiers must perform Service work in general, and
with this equipment in particular.
Never handle the TWT leads or the high-voltage connectors unless it has
been positively established that the high-voltage filter capacitors have
been discharged to a known safe level.
CAUTION:
A malfunctioning power supply can cause damage to the TWT. When
troubleshooting the TWTA, remove the TWT and substitute suitable
loads to prevent damage to the TWT.
4.2 UNAUTHORIZED REPAIRS
CAUTION:
Unauthorized repairs or modification of this product during the warranty
period may void the warranty. In the event that the TWTA malfunctions
while it is still under warranty, always contact an authorized service
representative.
4.3 PREVENTIVE MAINTENANCE
The RF characteristics and power supply voltages and currents of the TWTA should be logged on a regular
basis. Maintenance should be performed if significant deviations from the logged values appear. If the unit is
under warranty, contact an authorized service representative if impaired performance is suspected.
If there is accumulated dust on the air intake grill, clean it with dry compressed air. If significant dust has
been noted on the air intake grill, it may be desirable to vacuum the dust and debris from inside the enclosure.