Quantcast TS Guide 3. RTA LS-671 DS1 NOT LIT AND VAA DS1 IS LIT

 

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TS Guide 2. VAA DS1 NOT LIT WHEN CB1 IS SET TO ON
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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 4. NO REMOTE POWER FROM RTB LS-671


TM
115820-890203
TROUBLESHOOTING GUIDES. Continued
3.2.
TS Guide 3. RTA LS-671 DS1 NOT LIT AND VAA DS1 IS LIT
ACTIONS
CHECKS
STEPS
DS1 lit?
3.1
Replace RTA LS-671 DS1
NO:  Continue
YES: Replaced DS1 is bad
AM-7239 *
YES: Go to 3.2
NO:
Go to 3.3
used?
RT display lit?
YES: Go to 3.3
3.2 Set RT FCTN to SQ ON
NO:
Go to 3.6
N/A
N/A
3.3 Set RT FCTN to OFF
N/A
N/A
Set VAA & RTA LS-671 CB1s to
NO:
Open?
Go to 3.4
OFF
YES: Replace VAA
Check continuity at VAA
P1, Pin C to J9, Pin F
N/A
N/A
3.4 Remove CX-13292 from MB J3
NO:
Open?
Go to 3.5
Check continuity at MB
YES: Replace MB
J3, Pin C to J5, Pin C
N/A
N/A
3.5 Remove CX-13292 from LS-671 J1
N/A
N/A
Set LS-671 CB1 to ON
YES: Go to 3.9
Measure resistance at LS-671 J1,
Greater than
NO:
Replace LS-671
20 K Ohms?
Pin C to Pin A (GND)
N/A
N/A
3.6 Set RT FCTN to OFF
N/A
N/A
Set VAA & LS-671 CB1s to OFF
N/A
N/A
Remove CX-13292 from
RTA LS-671 J1
N/A
N/A
Set RTA LS-671 CB1 to ON
NO: Go to 3.7
Open?
Check continuity at LS-671 J1,
Pin B to Pin D
YES: Replace LS-671
N/A
N/A
3.7 Set RTA LS-671 CB1 to OFF
N/A
N/A
Reconnect CX-13292 to LS-671 J1
N/A
N/A
Remove VAA from MB
N/A
N/A
Set RTA LS-671 CB1 to ON
NO:
Measure voltage at MB J5,
2232 Vdc?
Go to 3.8
YES: Replace VAA
Pin E to Pin A (GND)
3.8 Remove CX-13292 from MB J3
N/A
N/A
Check continuity at CX-13292,
Open?
YES: Replace CX-13292
Pin B to Pin D
NO:
Replace MB
3.9 Connect CX-13292 to LS-671 J1
N/A
N/A
Measure resistance at CX-13292,
YES: Replace LS-671
Greater than
Pin C to Pin A (GND)
20 K Ohms?
NO:
Replace CX-13292
*
Not AM-7239A or AM-7239B
3-11


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