Quantcast TS Guide 17. RT-A: LESS THAN 30W FWD PWR OUT OF PA FROM EITHER 43-61.4 MHZ OR 61 .488 MHZ

 

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TS Guide 16. RT-B: LESS THAN 30W FWD PWR OUT OF PA FROM 30-40 MHZ
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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 19. RT SIG DISPLAY INCORRECT WITH RF PWR SET TO PA


TM
11-5820-89020-3
TROUBLESHOOTING GUIDES. Continued
3.2.
TS Guide 17. RT-A: LESS THAN 30W FWD PWR OUT OF PA
FROM EITHER 43-61.4 MHZ OR 61 .488 MHZ
I
CHECKS
ACTIONS
STEPS
N/A
N/A
17.1 Remove PA
N/A
N/A
Connect test set cable from
RT ANT to test set RADIO
N/A
N/A
Press PTT
YES: Go to 17.2
67 Vdc?
Measure voltage at VAA J1: *
NO:
Replace PA
54000 (CHAN 2) Pin R to Pin A (GND)
75000 (CHAN 3) Pin M to Pin A (GND)
N/A
17.2 Remove RT from VAA
N/A
NO:
Open?
Replace RT
Check continuity at VAA
YES: Replace VAA
54000 (CHAN 2) J8, Pin R to J1, Pin L
75000 (CHAN 3) J8, Pin M to J1, Pin V
TS Guide 18. RT-B: LESS THAN 30W FWD PWR OUT OF PA
FROM EITHER 43-61.4 MHZ OR 61.488 MHZ
STEPS
CHECKS
ACTIONS
18.1 Remove PA
N/A
N/A
N/A
N/A
Connect test set cable from
RT ANT to test set RADIO
Press PTT
N/A
N/A
Measure voltage at PA Mount J4: *
67 Vdc?
NO:
Go to 18.2
YES: Replace PA
54000 (CHAN 2) Pin R to Pin A (GND)
75000 (CHAN 3) Pin M to Pin A (GND)
18.2 Remove CX-13291 from PA Mount J3
N/A
N/A
Press PTT
N/A
N/A
Measure voltage at CX-13291: *
67 Vdc?
NO:
Go to 18.3
54000 (CHAN 2) Pin R to Pin A (GND)
YES: Replace PA Mount
75000 (CHAN 3) Pin M to Pin A (GND)
18.3 Remove RTB
N/A
N/A
Remove VAA from MB
N/A
N/A
Open?
Check continuity at VAA
NO:
Go to 18.4
54000 (CHAN 2) J11, Pin R to J7, Pin L
YES: Replace VAA
75000 (CHAN 3) J11, Pin M to J7, Pin V
18.4 Check continuity at CX-13291:
Open?
YES: Replace CX-13291
54000 (CHAN 2) P1, Pin R to P2, Pin R
NO:
Replace RT
75000 (CHAN 3) P1, Pin M to P2, Pin M
WARNING:
VAA J1 and PA MOUNT J4 have 200 VDC on Pin F.
Use extreme caution in measuring voltage.
3-21


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