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TS Guide 3. RTA LS-671 DS1 NOT LIT AND VAA DS1 IS LIT
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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 6. PA MOUNT DS1 NOT LIT AND VAA DS1 IS LIT


TM 115820890203
3.2.
TROUBLESHOOTING GUIDES. Continued
TS Guide 4. NO REMOTE POWER FROM RTB LS-671
CHECKS
ACTIONS
STEPS
4.1
Turn LS-671 DS1 full CCW
N/A
N/A
Turn LS-671 CB1 to ON
VAA DS1 lit?
NO:
Go to 4.2
YES: Go to 4.4
N/A
4.2 Set VAA & RTB LS-671
N/A
CB1s to OFF
N/A
Remove VAA from MB
N/A
Remove CX-13292 from MB J4
N/A
N/A
N/A
N/A
Set RTB LS-671 CB1 to ON
Open?
YES: Go to 4.3
Check continuity at CX-13292,
Pin B to Pin D
Replace MB
NO:
4.3
N/A
N/A
Remove CX-13292 from
RTB LS-671 J1
Open?
Check continuity at LS-671 J1,
YES: Replace LS-671
Pin B to Pin D
NO:
Replace CX-13292
4.4
Replace RTB LS-671 DS1
LS-671
YES: Replaced DS1 is bad
DS1 lit?
NO:
Go to 4.5
4.5
N/A
N/A
Set VAA & RT-B LS-671
CB1 S to OFF
Remove VAA from MB
N/A
N/A
Remove CX-13292 from MB J4
N/A
N/A
Check continuity at MB
Open?
NO:
Go to 4.6
J4, Pin C to J5, Pin C
YES: Replace MB
4.6
Remove CX-13292 from LS-671 J1
N/A
N/A
N/A
Set LS-671 CB1 to ON
N/A
Measure resistance at LS-671 J1,
Greater than
YES: Go to 4.7
Pin C to Pin A (GND)
20 K Ohms?
NO:
Replace LS-671
4,7
Connect CX-13292 to LS-671 J1
N/A
N/A
Measure resistance at CX-13292,
Greater than
NO:
Replace CX-13292
20 K Ohms?
YES: Replace LS-671
pin C to Pin A (GND)
TS Guide 5. PA MOUNT CB1 TRIPS AND VAA DS1 IS LIT
STEPS
CHECKS
ACTIONS
5.1
Remove PA
N/A
N/A
5.2 Set PA Mount CB1 to ON
CB1 trips?
Replace PA
NO:
YES: Replace PA Mount
312


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