Quantcast TS Guide 20. RT SIG DISPLAY DOES NOT LIGHT WHEN LS-671 PTT IS PRESSED

 

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TS Guide 19. RT SIG DISPLAY INCORRECT WITH RF PWR SET TO PA
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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 21. NO SIDETONE HEARD AT LS-671


TM 11-5820-890-20-3
3.2.
TROUBLESHOOTING GUIDES. Continued
TS Guide 20. RT SIG DISPLAY DOES NOT LIGHT
WHEN LS-671 PTT IS PRESSED
ACTIONS
CHECKS
STEPS
N/A
20.1 Remove W4 from VAA
N/A
J5 (RT-A)/J4 (RTB)
YES: Go to 20,2
Measure voltage at VAA J4/J5, Pin C
12.5 Vdc?
NO:
Replace VAA
to outside of connector
YES: Go to 20.3
20.2 Define problem
CX-13417
present at MB? NO:
Go to 20.6
N/A
N/A
20.3 LS-671 to OFF
N/A
N/A
Remove VAA fro MB
N/A
N/A
Remove CX-13417 from MB
J3 (RT-A)/J4 (RT-B)
NO:
Open?
Check continuity at MB J5, Pin K
Go to 20.4
YES: Replace MB
(RT-A)/Pin S (RT-B) to
J3/J4 Pin S
N/A
20.4 Remove CX-13292 from CX-13417
N/A
N/A
N/A
Remove CX-1 3417 from MB J3/J4
N/A
N/A
Connect CX-1 3292 to MB J3/J4
NO: Go to 20.5
Press LS-671 HS PTT
RT SIG display
YES: Replace CX-13417
lights?
20.5 Remove CX-13292 from LS-671 J1
N/A
N/A
and MB J3/J4
Open?
YES: Replace CX-13292
Check continuity at CX-13292 P1,
NO:
Replace LS-671
Pin J to P2, Pin S*
20.6 Set LS-671 CB1 to OFF
N/A
N/A
N/A
N/A
Remove VAA from MB
N/A
N/A
Remove CX-13292 from MB J3/J4
NO:
Open?
Check continuity at MB J5, Pin K
Go to 20.7
YES: Replace MB
(RT-A) /Pin S (RT-B)
to J3/J4 Pin S
20.7 Remove CX-13292 from LS-671 J1
N/A
N/A
Open?
YES: Replace CX-13292
Check continuity at CX-1 3292
NO:
Replace LS-671
P1, Pin J to P2, Pin S
*
P1 is speaker end; P2 is radio end.
3-23


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