Quantcast TS Guide 6. PA MOUNT DS1 NOT LIT AND VAA DS1 IS LIT

 

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TS Guide 4. NO REMOTE POWER FROM RTB LS-671
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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 8. RT DISPLAY READS FAIL 6


TM 115820890203
TROUBLESHOOTING GUIDES. Continued
3.2.
TS Guide 6. PA MOUNT DS1 NOT LIT AND VAA DS1 IS LIT
ACTIONS
CHECKS
STEPS
DS1 lit?
NO:
Go to 6.2
6.1
Replace PA Mount DS1
YES: Replaced DS1 is bad
N/A
N/A
6.2 Remove PA from PA Mount
N/A
N/A
Remove cable from PA Mount J1
2232 Vdc?
YES: Go to 6.3
Measure voltage at cable,
NO:
Go to 6.5
Pin C to Pin A
Go to 6.4
2232 Vdc?
6.3 Measure voltage at cable,
NO:
YES: Replace PA Mount
Pin B to Pin A
N/A
N/A
6.4 Remove VAA from MB
N/A
N/A
Remove power cable from MB J2
2232 Vdc?
YES: Replace CX13303
Measure voltage at MB J2,
Replace MB
NO:
Pin B to Pin A (GND)
N/A
N/A
6.5
Remove VAA from MB
N/A
N/A
Remove cables from MB J1 and J2
Open?
NO:
Go to 6.6
Check continuity at MB
YES: Replace MB
J2, Pin C to J5, Pin C
LS-671 or VIC
Go to 6.7
NO:
6.6 Check for external devices
YES: Replace CX13303
used?
N/A
N/A
6.7 Ensure VAA is set to LOCAL
N/A
N/A
Set CB1 to ON
Open?
YES: Replace VAA
Check continuity at VAA
NO
P1, Pin C to J9, Pin F
Replace CX-13291
TS Guide 7. RT DISPLAY DOES NOT LIGHT AND VAA DS1 IS LIT
STEPS
CHECKS
ACTIONS
7.1
If no LS-671/VIC used, ensure
N/A
N/A
VAA set to LOCAL
Set RT FCTN to STBY
N/A
N/A
Move RTA/RT-B to other RT
N/A
N/A
position
Set RT FCTN to SQ ON
N/A
N/A
RT display lit?
Observe RT display
NO:
Go to 7.2
YES: Replace VAA
7.2
Check AM-7239 model used
AM-7239B
NO:
Go to 7.3
used?
YES: Replace RT
7.3
Measure voltage at VAA J8/J7
12.51 3.5
YES: Replace RT
(RT-A/B), Pin F to Pin Z (GND)
Vdc?
NO:
Replace VAA
313


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