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Step 8. LS-671 CHECKS
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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 2. VAA DS1 NOT LIT WHEN CB1 IS SET TO ON


TM 11-5820890-203
TROUBLESHOOTING GUIDES.
3.2.
TS Guide 1. VAA CB1 TRIPS WHEN SET TO ON
*
Read notes below before troubleshooting
ACTIONS
STEPS
CHECKS
N/A
N/A
Remove cables from
1.1
N/A
N/A
MB J2/J3/J4 and VAA J9
YES: Go to 1.10
CB1 trips?
Set VAA to LOCAL
NO:
Go to 1.2
Set VAA CB1 to ON
VIC used?
YES: Go to 1.3
1.2 Check external equipment
NO:
Go to 1.4
1.3
Remove CX-13300 from VIC
N/A
N/A
YES: Replace CX-13300 **
Short to GND?
Check continuity at CX-13300,
Pin C to Pin A (GND)
NO:
Problem is with VIC
1.4 Check external equipment
YES: Go to 1.5
C-M used?
NO:
Go to 1.6
1.5
N/A
N/A
Remove CX-13290 from C-M
YES: Replace CX-13290 **
Check continuity at CX-13290,
Short to GND?
Pin F to Pin A (GND)
NO:
Problem is with C-M
1.6 Check external equipment
LS-671 used?
YES: Go to 1.7
NO:
Go to 1.8
1.7
Remove CX-13292 from LS-671 J1
N/A
N/A
Check continuity at LS-671 J1 ,
Short to GND?
YES: Replace LS-671 **
Pin C to Pin A (GND)
NO:
Replace CX-13292
1.8 Check external equipment
RT B PA
YES: Go to 1.9
Mount used?
NO:
Go to 1.10
1.9 Remove PA from PA Mount
N/A
N/A
Remove CX-13303 from PA Mount J1
N/A
N/A
Check continuity at PA Mount J1,
Short to GND?
NO:
Replace CX-13303**
Pin C to Pin A (GND)
YES: Replace PA Mount
1.10 Remove VAA from MB
N/A
N/A
Check continuity at MB J5,
Short to GND?
NO:
Replace VAA
Pin C to Pin A (GND)
YES: Replace MB
*
NOTES:
(1)
If a second radio is "daisy chained" to J2, disconnect cable at J2, If problem clears ,
reconnect and rerun Op Check on second radio set.
(2)
If UUT is an AN/VRC-89A/90A/91A/92A, RTA PA can trip the circuit breaker. Remove
PA, set CB1 to ON, and try again. If problem clears, RTA PA is bad.
(3)
If UUT has LS-671 (s), set VAA to LOCAL, remove all cables from MB J3/J4, and set CB1
to ON. If problem clears, go to Step 1,5.
(4)
If UUT has RTB PA Mount, disconnect cable from J2. If problem clears, go to Step 1.6,
After completing a corrective action, continue with the next Operational Check step.
**(5)
39


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