AR 1000TP8G18 Series, Operating And Service Manual

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Model 1000TP8G18
28 Rev -
To open the enclosure:
1. Remove the units from the cabinet or rack as follows:
NOTE: Due to the weight of the unit, the removal of the amplifier from the cabinet or rack is a two-
person operation.
2. Disconnect power, RF, and any other interface connectors. On the rear of the unit, remove any screws
used to connect brackets to the amplifier. On the front of the unit, remove all of the screws holding the
front panel to the cabinet. Carefully slide the entire amplifier out of the front of the cabinet.
3. Remove the screws that secure the lower cover and the screws that secure the upper cover. Remove the
covers to gain access to the interior of the amplifier.
4. Vacuum dust and debris from inside the enclosure. Clean dust from the TWTA and its flying leads.
Remove any dirt from around the high voltage connectors. While the cover is off, check for loose wires,
components or fasteners.
5. Reassemble in the 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 fan or fan driver.
No response when main power turned on
Disconnected power cable
Defective circuit breaker
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 head PC board defective.
Control module "datalink failure" error appears
HPA interface failure.
Fiberoptic link failure
+15 VDC supply failure
Data steering board 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
Defective SSA
Gain turned down
After reviewing 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 or loose connectors and
internally for unmated or loose parts
.