Table 5-2. Preventive Maintenance Schedule

TM 11-5820-917-13

Preventive Maintenance Schedule

Table 5-2.

Procedure

Schedule

1. Perform self-test to check receiver operation and

Daily (at beginning of

condition of standby battery. For receiver opera-

each shift).

tion, the main power and standby battery must be

on and the receiver must be sweeping. See para-

graph 5-15 for standby battery test.

2. Check receiver synchronization by actuating

Daily (at beginning of

DISPLAY CYCLE switch. To adjust the display

each shift).

synchronization, sequence MODE switch to the

three SET positions and, in each position, adjust

NOTE

display using the ADV/RET switch. Also check

for evidence of sounder record display dropout.

Adjust only while

A recurring indistinct or broken path display could

selected path sweep

indicate a faulty antenna connection, defective

is in progress.

power divider, or defective receiver preselector

filter.

3. Check operation of 6025 and 4028 exhaust fan

Weekly (daily if in

efficiency. Fan suction should be sufficient

dusty area).

to hold paper placed over intake filter (rear

panel of 6025 and front panel of 4028). If

necessary, remove and clean filter by submerg-

ing in warm water. Thoroughly blow dry with

compressed air.

4. Check frequency standard, and adjust if

Monthly (or if excessive

necessary per paragraph 5-21.

drift is observed on all

paths simultaneously.

5. Make visual inspection of all interconnecting

Monthly

cables and connectors at rear of units. Ensure

that plugs are fully inserted and that no undue

strain is being placed on cables.

6. Remove top covers from receiver units and

Quarterly

make visual inspection of interiors. Ensure that

modules are properly seated and that no loose wires

or signs of overheating exist.

7. Check all low voltage DC power supplies per

Semi-Annually

instructions of paragraph 5-13.

5-3