Maintenance; Safety Warnings; Unauthorized Repairs - Amplifier Research Manual

Model 500T1G2
The TWTA has minimal maintenance requirements. The only moving parts are the elements of switches, relays
and the fans. Preventive maintenance recommendations are found in Paragraph 4.3.
Most repairs to the TWTA should be performed by the factory. However, some user service organizations may
choose to make feasible repairs in-house. To support this, limited schematic diagrams and parts information is
supplied in this manual (see Section V). Warnings and Cautions should be observed.
4.1 S W
AFETY ARNING
Service work must be performed only by technicians thoroughly familiar with the high voltages present in
microwave tube amplifiers in general, and with this equipment in particular.
Never handle the TWT leads or the high-voltage connectors unless the unit is unplugged and it has been
positively established that the high-voltage filter capacitors have been discharged to a known safe level.
A malfunctioning power supply can cause damage to the TWT. If you are troubleshooting the TWTA,
remove the TWT and substitute suitable loads to prevent damage to the TWT.
4.2 U
NAUTHORIZED
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 P M
REVENTIVE
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, remove it and 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. To open the enclosure:
1)
NOTE: D

MAINTENANCE

R
EPAIRS
AINTENANCE
Remove the amplifier from the cabinet or rack as follows:
UE TO THE WEIGHT OF THE UNIT
CABINET OR RACK IS A TWO PERSON OPERATION
SECTION IV
W !
ARNING
C
AUTION
C
AUTION
,
THE REMOVAL OF THE AMPLIFIER FROM THE
.
Manual Text
4-1
REV A