TS Guide 1. VAA CB1 TRIPS WHEN SET TO ON

TM 11-5820890-203

TROUBLESHOOTING GUIDES.

3.2.

TS Guide 1. VAA CB1 TRIPS WHEN SET TO ON

Read notes below before troubleshooting

ACTIONS

STEPS

CHECKS

N/A

Remove cables from

1.1

N/A

MB J2/J3/J4 and VAA J9

YES: Go to 1.10

CB1 trips?

Set VAA to LOCAL

NO:

Go to 1.2

Set VAA CB1 to ON

VIC used?

YES: Go to 1.3

1.2 Check external equipment

NO:

Go to 1.4

1.3

Remove CX-13300 from VIC

N/A

YES: Replace CX-13300 **

Short to GND?

Check continuity at CX-13300,

Pin C to Pin A (GND)

NO:

Problem is with VIC

1.4 Check external equipment

YES: Go to 1.5

C-M used?

NO:

Go to 1.6

1.5

N/A

Remove CX-13290 from C-M

YES: Replace CX-13290 **

Check continuity at CX-13290,

Short to GND?

Pin F to Pin A (GND)

NO:

Problem is with C-M

1.6 Check external equipment

LS-671 used?

YES: Go to 1.7

NO:

Go to 1.8

1.7

Remove CX-13292 from LS-671 J1

N/A

Check continuity at LS-671 J1 ,

Short to GND?

YES: Replace LS-671 **

Pin C to Pin A (GND)

NO:

Replace CX-13292

1.8 Check external equipment

RT B PA

YES: Go to 1.9

Mount used?

NO:

Go to 1.10

1.9 Remove PA from PA Mount

N/A

Remove CX-13303 from PA Mount J1

N/A

Check continuity at PA Mount J1,

Short to GND?

NO:

Replace CX-13303**

Pin C to Pin A (GND)

YES: Replace PA Mount

1.10 Remove VAA from MB

N/A

Check continuity at MB J5,

Short to GND?

NO:

Replace VAA

Pin C to Pin A (GND)

YES: Replace MB

NOTES:

(1)

If a second radio is "daisy chained" to J2, disconnect cable at J2, If problem clears ,

reconnect and rerun Op Check on second radio set.

(2)

If UUT is an AN/VRC-89A/90A/91A/92A, RTA PA can trip the circuit breaker. Remove

PA, set CB1 to ON, and try again. If problem clears, RTA PA is bad.

(3)

If UUT has LS-671 (s), set VAA to LOCAL, remove all cables from MB J3/J4, and set CB1

to ON. If problem clears, go to Step 1,5.

(4)

If UUT has RTB PA Mount, disconnect cable from J2. If problem clears, go to Step 1.6,

After completing a corrective action, continue with the next Operational Check step.

**(5)