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TM 11-5820-890-20-2
4-2
4.1.
OPERATIONAL CHECK. Continued
STEP 2. POWER/COMSEC CHECKS:
STEPS TO PERFORM
CHECKS TO MAKE
ACTIONS TO TAKE
2.1
Set RCU FCTN to SQ ON
N/A
N/A
RCU display lights?
YES: Go to Step 2.2
NO:
Replace RCU battery box
RCU display then lights?
YES: Go to Step 2.2
NO:
Replace RCU
2.2
Set RCU FCTN to STBY
(Do not set FCTN to OFF;
fill data will be lost at both
RCU and RT)
Connect field wire from
RCU to RT, VAA, or SRM
N/A
N/A
N/A
Go to Step 2.3
2.3
Set RT FCTN to REM
Set RCU:
FCTN to LD
DATA to OFF
N/A
N/A
N/A
N/A
N/A
N/A
(RCU display changes to RT info af
ter 15 seconds)
RCU display reads OFF?
YES: Go to Step 2.4
NO:
Replace RCU
2.4
Clear COMSEC alarm
Alarm clears?
YES: Go to Step 2.5
NO:
Replace RCU
2.5
Load COMSEC data
Variable loads?
YES: Go to STEP 3
NO:
Replace RCU
STEP 3. RCU/RT SELF TEST:
STEPS TO PERFORM
CHECKS TO MAKE
ACTIONS TO TAKE
3.1
Set RCU FCTN to TST
RCU display reads GOOD for
RCU self test?
YES: Continue
NO:
Replace RCU
RCU display reads GOOD for
RT self test?
YES: Continue
NO:
Replace RT
RCU display then reads OPEN?
NO:
Go to STEP 4
YES: Go to TS Chart 1
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