TM 11-6625-1831-13
5-3c. Troubleshooting Break Out Box
This task covers:
Correcting malfunctions found during Break Out Box electrical test (paragraph 5-2c).
INITIAL SETUP:
Special Environmental Conditions
None
Tools
General Safety Instructions
Electronic Equipment Tool Kit, TK-105/G
None
Test Equipment
Equipment Condition
Multimeter AN/USM 223
Break Out Box cover removed (para 5-4b)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1.
No continuity from test jack to cable plug.
Step 1.
Check test jack and wire connection.
Replace jack or repair wire as necessary (para 5-10, 5-14).
Step 2.
Check connection at cable plug 3P15.
Repair as necessary (para 5-10).
2.
No continuity between front panel jacks.
Step 1.
Check connection at each jack.
Repair as necessary (para 5-10).
Step 2.
Check wire between jacks.
Repair as necessary (para 5-14).
3.
Continuity through DDL-PROC switch.
Check switch. Measure resistance from terminals 2 to 3 of DDL-PROC switch; should be infinity
Replace switch if defective (para 5-10).
4. Wrong resistance from jack R through R5 and DDL-PROC switch.
Step 1.
Check wiring. Check continuity from 3P15-R to resistor R5, from R5 to terminal 2 of DDL-
PROC switch, and from terminal 3 of switch to +5 jack.
Repair as necessary (para 5-14).
Step 2.
Check components. Measure resistance of R5-should be 560 ohms. Measure resistance from
terminals 2 to 3 of switch; should be zero ohms.
Replace defective components (para 5-10).
5-39
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