CHPA
S
ERIES
6-2
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D
OC
.01023245
R
EV
.R
Preventive maintenance is divided into mechanical maintenance, electrical calibration, and
performance testing. A description of how to care for spare TWTs and start-up procedures to
follow when the HPA is turned off for extended periods is provided. The recommended
maintenance schedule is shown in Table 6-1. Certain test equipment is required for these
maintenance procedures. Table 6-2 lists recommended equipment; equipment with equivalent
accuracy or capacity may be substituted. Locations of major assemblies are shown in drawing
01020260, “CHPA power supply and 01020371/01020270/01022070 RF assembly drawings.”
6.3 Mechanical Preventive Maintenance
WARNING! SWITCH OFF ALL POWER AND LEAVE UNIT FOR FIVE
MINUTES BEFORE PERFORMING SERVICE OPERATIONS. BEFORE
ATTEMPTING INSPECTIONS OR CLEANING WITH SOLVENTS, PROVIDE
ADEQUATE VENTILATION TO AVOID BREATHING FUMES. WHEN
CLEANING WITH CLEAN, DRY COMPRESSED AIR, IT SHALL NOT EXCEED
25 PSI (1.75 KG/CM) AND WEAR SAFETY GOGGLES.
Table 6-1. Preventive Maintenance Schedule CHPA
Mechanical Task
Daily
1 Month
3 Months 6 Months 1 Year
1 Log Meter Readings
X
2 Clean Air Filter
X
1
3 Check LEDs and Display
X
1
4 Perform Visual Inspection
X
1
5 Collector Air System Maintenance
1
X
6 Check the Collector Blower
X
2
7 Perform Misc. Cleaning
X
1
Electrical Task
Daily
1 Month
3 Months 6 Months 1 Year
1 Perform Initial Power-On Check
X
2 Verify Fault/Alarm Circuits and Limit Settings
X
3A Verify Heater Setting
X
3B Verify Collector Setting
X
3C Verify Helix Setting and Metering
1
X
4 Verify RF Metering
1
X
1
5 Run Performance Tests
X
6 Test Any Spare Tubes
X
Table 6-1 Notes:
1.
Cleaning may be required more or less frequently than shown.
2.
Blower replacement at 40,000 hours of operation.
