Quantcast TS Guide 10. COMSEC ALARM NOT HEARD, OR WILL NOT CLEAR (EXTERNAL DEVICE)

 

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TS Guide 8. RT DISPLAY READS FAIL 6
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TM-11-5820-890-20-3 Ground ICOM Radio Sets AN/PRC-119A AN/VRC-87A AN/VRC-88A AN/VRC-89A AN/VRC-90A AN/VRC-91A AN/VRC-92A Manual
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TS Guide 11. VARIABLE (COMSEC OR FH DATA) WILL NOT LOAD


TM
115820-890-20-3
TROUBLESHOOTING GUIDES. Continued
3.2.
TS Guide 10. COMSEC ALARM NOT HEARD, OR WILL NOT CLEAR
(EXTERNAL DEVICE)
CHECKS
ACTIONS
STEPS
Alarm heard?
Go to 10.2
10.1 Define problem
Go to 10.10
Alarm will not
clear?
YES: Go to 10.3
10.2 Check external devices
CX-13313 or
CX-13417
NO:
Go to 10.4
present?
N/A
N/A
10.3 Remove VAA and set to LOCAL
N/A
N/A
Remove cables from MB J3/J4
N/A
N/A
Reinstall VAA and RT
Set RT:
N/A
N/A
COMSEC to CT
NO:
FCTN to LD
Go to TS Guide 9
Alarm still
heard?
YES: VIC/cables are bad
Alarm heard
10.4 Recheck alarm
YES: Go to 10.5
Go to TS Guide 9
at HS?
NO:
` 10.5 Check for LS-671 use
LS-671
YES: Go to 10.6
present?
NO: Go to 10.8
10.6 Recheck alarm
A l a r m heard NO:
Go to 10.7
at LS-671 ?
YES: Go to 10.8
N/A
N/A
10.7 Remove CX-13292 from LS-671
N/A
N/A
Set VAA to LOCAL
Measure voltage at CX-13292,
Go to 10.8
NO:
0.4 Vac or
greater?
YES: Replace LS-671
Pin K to Pin A
10.8 Remove VAA from MB
N/A
N/A
Remove CX-13292 from MB
N/A
N/A
NO:
Check continuity at CX-13292,
Open?
Go to 10.9
Pin K to Pin K
YES: Replace CX-13292
10.9 Check continuity at MB
Open?
YES: Replace MB
J5, Pin H (RTA)/Pin P (RT B)
NO:
Replace VAA
to J3/J4, Pin K
10.10 Check external devices
CX-13313 or
NO:
Go to 10.11
CX-13417
YES: Go to 10.3
present?
10.11 Clear alarm at HS
Alarm clears?
YES: Go to 10.12
NO:
Go to TS Guide 9
10.12 Check for LS-671 use
LS-671
YES: Go to 10.13
present?
NO:
Go to 10.17
10.13 Move HS to LS-671 and clear alarm
Alarm clears? NO:
Go to 10.14
YES: Go to 10.17
315


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