Control-interface Unit Troubleshooting

TM 11-6625-2937-13

5-7.

Control-interface Unit Troubleshooting

Test equipment

Common name

a. Tools and Test Equipment Required. The

Oscilloscope AN/USM-281C

Oscilloscope

following tools and test equipment are required for

Test Set, Electronic Systems AN/UYM-7

Digital tester

troubleshooting the control-interface unit.

Tool Kit, Electronic Equipment TK-IOSG

Tool kit

b. Test Setup. The control-interface unit test

Test equipment

Common name

setup is shown in figure 5-1. Perform the physical tests

given in table 5-3 prior to connecting the equipment in

Program card SM-A-942909-2

BITE card

the test setup.

Extender card SM-D-942431-2

STE extender card

Multimeter AN/USM-223

Multimeter

Figure 5-1. Control-interface unit, test setup.

c. Preliminary Control Settings. Set the

d. Testing Procedures.

The first step in

equipment controls as follows prior to functionally testing

troubleshooting the control-interface unit is to perform

the control interface unit.

the functional test procedure given in table 5-1. Then,

when a faulty indication is obtained, locate the

Control

Setting

appropriate MALUN ON in table 5-2 and continue as

Control-interface unit:

directed by the TEST or INSPECTION and

POWET ON/OFF

OFF

CORRECTIVE action columns of the table.

Power circuit breaker CB1

In (on)

e. Troubleshooting Procedures. Table 5-2

MODE SELECT

POWER OFF

contains the control-interface unit troubleshooting

Digital tester:

procedure. If the performance test (table 5-1) fails, refer

POWER

Down (off)

to the appropriate malfunction in table 5-2. Waveforrns

UUT POWER

Down (off)

are shown in figure

DISPLAY

PASS/FAIL

TEST RATE PER SEC

NUMBER OF TESTS

20M

PROBE THRESHOLD

5-2