Table 5-2. Preventive Maintenance Schedule

TM 11-5820-918-13

Preventive Maintenance Schedule - Continued

Table 5-2.

Procedure

Schedule

Check cooling fan efficiency on the 1024 and 5018

Weekly

units. For the 5018 unit, movement of air should

(daily if in dusty

area)

be easily detected about 12 in. (20cm) away from

the rear panel fan which exhausts air from the unit.

The 5018 inlets are filtered (the 1024 is not filtered).

Remove and clean inlet filter if exhaust air flow is

inadequate. Remove the 12 screws that hold the unit

to the 5018 from panel and wash the filter with water,

either spraying or submerging the unit. Dry

thoroughly.

Monthly

Make check of RF power elements by determining

power output of 4011 unit to be 50-150 watts during

normal non-diplexed sweep operations. This is

accomplished by performing RF power performance

test (paragraph 5- 22) and frequency test (paragraph

5-23).

Monthly and prior

Make visual inspection of all interconnecting cables

and connectors at rear of units. Ensure that plugs

to new startup.

are fully inserted and that no undue strain is being

placed on cables.

Every 3 months

Remove top covers from all (three) units and make

visual inspection of interiors. Ensure that all

modules are properly seated and that no loose wires

or signs of overheating exist.

Every 3 months

Make visual check of power heat sink located at rear

of 4011 filter/diplexer unit. Note any discoloration

or signs of excessive heating in surrounding hard-

ware. The dummy load in this unit is designed to

absorb 300 watts (maximum) of RF power in the

diplexed mode.

Check all low voltage DC power supplies per instruc-

Every 3 months

tions given in the adjustment procedures, paragraphs

5-14, 5-19, 5-25, and 5-28.

10.

Every 3 months

Check transmitter output spectral purity by performing

harmonics/spurious response test (paragraph 5-30).

5-3