40T18G26A
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 the four screws
holding the front panel onto the cabinet. Carefully slide the amplifier out of the front of the cabinet.
2.
Remove the 12 screws that secure the lower cover and the 12 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 three high-voltage connectors. While the cover is removed, check
for loose wires, components, or fasteners.
Reassemble in the reverse order.
4.4 TROUBLESHOOTING
Table 4-1. Model 40T18G26A TWTA Troubleshooting Guide
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, EPROM pins are bent, 64-conductor ribbon
cable is defective.
Control module "datalink failure" error or “Communication Problem”
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
Defective remote control board
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 any 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.
26
Rev C
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