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TS Guide 11. VARIABLE (COMSEC OR FH DATA) WILL NOT LOAD
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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 14. FORWARD POWER INCORRECT THRU PA IN RF PWR HI


TM 11-5820-890-20-3
3.2.
TROUBLESHOOTING GUIDES. Continued
TS Guide 12. FAILED FORWARD AND REVERSE POWER CHECK
ACTIONS
CHECKS
STEPS
N/A
N/A
12.1 Remove veh ant cable from ant base
N/A
N/A
Connect dummy load to vehicle
antenna cable
N/A
N/A
Set test set MODE to FWD PWR
FWD PWR
YES: Go to 12.2
Press PTT and PTTest
more than
NO:
Replace RT
2 W?
12.2 Set test set MODE to RVS PWR
N/A
N/A
RVS PWR less
YES: Go to 12.3
Press PTT and PTTest
than 0.3 W?
NO:
Replace veh ant cable
N/A
12.3 Remove ant cable from dummy load
N/A
NO: Go to 12.4
Is antenna
Connect ant cable to vehicle
YES: Go to 12.5
system clean?
antenna base
12.4 Clean ant elm contacts
N/A
N/A
N/A
N/A
Clean ant GND straps
N/A
N/A
Clean rust from ant mounting
hardware
RVS PWR
YES: Go to 12.5
Re-measure FWD/RVS PWR
high? *
NO:
UUT is now Operational
12.5 Replace ant elements
N/A
N/A
Re-measure FWD/RVS PWR
RVS PWR
YES: Replace ant base
high? *
NO:
Replaced ant elements
are bad
*
Reverse Power Check: 1. Measure Forward Power and Reverse Power
2. Divide Forward Power by Reverse Power
3. If result is 3.0 or MORE, RVS PWR is normal for voice
4. If result is 4,0 or MORE, RVS PWR is normal for data
TS Guide 13. NO SIDETONE WITH FORWARD/REVERSE POWER CORRECT
STEPS
CHECKS
ACTIONS
13.1
Remove W4 from RT AUD/DATA
N/A
N/A
Move HS to RT AUD/FILL
N/A
N/A
Press PTT; count into HS
Sidetone
YES: GO to 13.2
heard?
NO:
Replace RT
13.2
Move HS to RT AUD/DATA
N/A
N/A
Press PTT; count into HS
Sidetone
YES: Go to 13.3
heard?
NO:
Replace RT
13.3
Check continuity of W4,
Open?
YES: Replace W4 cable
Pin D to Pin D
NO:
Replace VAA
3-17


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