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The recommended cycle is three months but inspection may be
required more often if local air pollution warrants it. To verify
proper TWT cooling proceed as follows:
b.
c.
d.
e.
f.
6.3 Other Preventive Maintenance Tasks
Refer to the Preventive Maintenance Chapter of the Service Manual
for additional preventive maintenance tasks (Requires a service
technician who has attended a formal training program for service
of the amplifier to perform these tests).
6.4 Customer Service
Refer to Appendix A, "Warranty and Support Information", for CPI
Satcom contact, service, and return information.
6-4
Put the amplifier in STANDBY mode and allow the TWT to
cool; then set the amplifier main power to OFF.
Visually check the TWT heatsink fins. Check for build up of
foreign material that creates a reduction in air flow. If there
are air flow restrictions or extensive dust deposits, have the
service technician remove the Amplifier fan shroud and/or
fan assembly and clean the fins with a small vacuum cleaner
or compressed air.
Monitor the operation of the fan with AC power ON.
With the amplifier in STANDBY State, verify that the fan is
operating smoothly. If a mechanic's stethoscope is available,
check for bearing rumble (which indicates wear). If a fan is
faulty, have the service technician replace it
Check for dust in the fan assembly. An accumulation of dust
is a sign that the TWT heatsink fins need more frequent
cleaning.
M A I N T E N A N C E
Installation and Operation Manual
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