TS Guide 12. FAILED FORWARD AND REVERSE POWER CHECK

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

12.1 Remove veh ant cable from ant base

N/A

Connect dummy load to vehicle

antenna cable

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

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

Clean ant GND straps

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

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

Move HS to RT AUD/FILL

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

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