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CHPA SERIES
Preventive maintenance is divided into mechanical maintenance, electrical calibration, and
performance testing. Also provided is a description of how to care for spare TWTs and start-up
procedures to follow when the HPA is turned off for extended periods. The recommended
maintenance schedule is shown in Table 6-1. Certain test equipment is required for these
maintenance procedures. Table 6-2 lists the recommended equipment; equipment with
equivalent accuracy or capacity may be substituted. Locations of major assemblies are shown in
drawing 01020260, "Compact HPA power supply and 01020371 /01020270/01022070 RF
assembly drawings."
6.3 Mechanical Preventive Maintenance
WARNING! BEFORE ATTEMPTING ANY INSPECTION OR CLEANING, SWITCH OFF
ALL POWER AND LEAVE UNIT FOR FIVE MINUTES BEFORE PERFORMING
SERVICE OPERATIONS).
VENTILATION AND AVOID BREATHING FUMES.
WEAR SAFETY GOGGLES AND USE CLEAN, DRY, COMPRESSED AIR NOT
EXCEEDING 25 PSI (1.75 KG/CM).
Table 6-1. Preventive Maintenance Schedule CHPA
Mechanical Task
1 Log Meter Readings
2 Clean Air Filter
3 Check LEDs and Display
4 Perform Visual Inspection
5 Collector Air System Maintenance
6 Check the Collector Blower
7 Perform Misc. Cleaning
Electrical Task
1 Perform Initial Power-On Check
2 Test/Verify Fault & Alarm Circuits and
Limit Settings
3A Verify Heater Setting
3B Verify Collector Setting
3C Verify Helix Setting and Metering
4 Verify RF Metering
1
6-2
Daily
X
1
Daily
1
THIS DOCUMENT IS THE PROPERTY OF COMMUNICATIONS & POWER INDUSTRIES.
REPRODUCTION OR RELEASE WITHOUT EXPRESS PERMISSION IS STRICTLY PROHIBITED
WHEN USING SOLVENTS, PROVIDE ADEQUATE
1 Month
3 Months
X
1
X
1
X
1
X
X
X
1 Month
3 Months
X
X
WHEN CLEANING WITH AIR,
6 Months
1 Year
2
1
6 Months
1 Year
X
X
X
X
1
D
.01023245 R
OC
.L
EV
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