AR 10012514, Руководство по эксплуатации и обслуживанию

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Model 300T2G8
Disconnect power, RF and any other interface connectors. On the rear of the unit, remove any screws
used to connect brackets to amplifier (two on each bracket). On the front of the unit, remove the four
screws (two outside screws on each side) mounting the front panel to the cabinet. Carefully slide the
amplifier out of the front of the cabinet.
2. Remove the six screws that secure the lower cover and the six screws that secure the upper cover.
Remove the covers to gain access to the interior of the TWTA.
Vacuum dust and debris from inside the enclosure. Clean dust from the TWTA and its flying leads. Remove
any dirt from around the five high voltage connectors. While the cover is off, check for loose wires,
components or fasteners
Reassemble in reverse order.
4.4 TROUBLESHOOTING
Symptom Possible cause
TWT or power supply overtemperature Air inlet filter dirty
Collector heat sink dirty
Inadequate clearance behind TWTA
High air inlet temperature
Defective blower or power supply
No response when main power turned on Panel open interlock switch open
Control module display does not come up; unit does not beep when
powered up Shorted or defective control module power supply
Control module failure
Control module does not boot EPROM(s) missing.
Control module "datalink failure" error appears
HPA interface failure.
Fiberoptic link failure
+15 VDC supply failure
Heater power supply does not come up Defective low voltage power supply module
Defective heater power supply module
No high voltage Open external interlock
Keylock switch on INHIBIT or REMOTE
Defective high voltage power supply.
Voltages normal, but no RF output, helix current low No RF input
No pulse gate input in pulse mode
Defective remote control board
Defective SSA
Gain turned down
Open inhibit
After review of the symptoms of the failure, the user may want to check for a loose connector or component
especially after rough handling of the unit. Look externally for physical damage and internally for unmated or
loose parts.
The service technician should become familiar with the internal mechanical construction to permit correct re-
assembly. Limited troubleshooting may be conducted, with caution, based on the failure symptom and an
understanding of the logic/schematic diagrams.
30 Rev A