TS Guide 15. RTA: LESS THAN 30W FWD PWR OUT OF PA FROM 30-40 MHZ

115820-890-20-3

3.2.

TROUBLESHOOTING GUIDES. Continued

TS Guide 15. RTA: LESS THAN 30W FWD PWR OUT OF PA FROM 30-40

MHZ

ACTIONS

CHECKS

STEPS

N/A

15.1

Start veh engine

Re-measure FWD PWR

NO:

FWD PWR

GO to 15.2

greater than

YES: Problem is with

30 w?

vehicle power

N/A

15.2 Remove W2 from RTA

N/A

Remove PA

N/A

Connect test set cable from

N/A

RT ANT to test set RADIO

Press PTT

N/A

Measure voltage at VAA J1,

NO:

67 Vdc?

Go to 15.3

YES: Go to 15.4

Pin N to Pin A (GND)

15.3 Remove RT

N/A

Check continuity at VAA

Open?

NO:

Replace RT

YES: Replace VAA

J1, Pin N to J8, Pin H

N/A

15.4 Press PTT

N/A

Measure voltage at VAA J1,

67 Vdc?

NO:

Go to 15.5

YES: Go to 15.6

Pin P to Pin A (GND)

15.5 Remove RT

N/A

Check continuity at VAA

Open?

J1, Pin P to J8, Pin M

15.6 Measure voltages at VAA J1:

All voltages

YES: Replace PA

Pin B

6.556.95 Vdc

NO:

correct?

Replace VAA

Pin C

12.5 -13.5 Vdc

Pin D

22.032.0 Vdc

Pin F

180220 Vdc

VAA J1 and PA MOUNT J4 have 200 VDC on Pin F.

WARNING:

Use extreme caution in measuring voltage.

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