TS Guide 14. FORWARD POWER INCORRECT THRU PA IN RF PWR HI

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

Remove RF cable from PA J2

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

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

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.

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