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TS Guide 12. FAILED FORWARD AND REVERSE POWER CHECK
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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 15. RTA: LESS THAN 30W FWD PWR OUT OF PA FROM 30-40 MHZ


TM 11-5820-890203
TROUBLESHOOTING GUIDES. Continued
3.2.
TS Guide 14. FORWARD POWER INCORRECT THRU PA IN RF PWR HI
STEPS
CHECKS
ACTIONS
14.1 Define problem
FWD PWR
greater than
6 W?
14.2 Remove test set cable from RADIO
N/A
N/A
N/A
Remove RF cable from PA J2
N/A
N/A
N/A
Connect W2 to test set RADIO
Press PTT and PTTest
FWD PWR
YES: Go to 14.3
26 W?
NO:
Replace W2*
14.3 Remove PA
N/A
N/A
Measure voltages at VAA J1 (RTA)
All voltages
No:
Go to 14.4
or PA Mount J4 (RT- B):
YES: Replace RT
correct?
Pin B
6.556.95 Vdc
Pin C
12.5 13.5 Vdc
Pin D
22.032.0 Vdc
**
Pin F
180220 Vdc
14.4 Define problem
YES: Replace VAA
NO:
Replace PA Mount
14.5 Remove PA
N/A
N/A
N/A
Press PTT
N/A
Measure voltage at VAJ1 J1 or
(-)0.5-0.5
YES: Replace PA
PA Mount J4, Pin N to
Vdc?
NO:
Replace RT
Pin A (GND)
*
Or CG-3856
**
WARNING:
VAA J1 and PA MOUNT J4 have 200 VDC on Pin F.
Use extreme caution in measuring voltage.
3-18


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