Types of Operation - TM-11-6625-467-120017

TM 11-6625-467-12

presents a visual indication of the performance of

ticular switch is not relative to the test being per-

the module. Paragraphs 3-6 through 3-12 cover the

formed.

various module tests that can be performed with the

NOTE

test set.

The calibration adjustments of the test

b. Power Supply. The test set may also be used

set required for the module tests are in-

as a 27.5-volt direct current (de) power source to

dicated in the CIRCUIT SELECTOR

operate a complete Radio Set AN/ARC-54. Refer to

c o l u m n i n parenthesis

switches

paragraph 3-13 for instructions for this mode of

( c a l i b r a t e ) . If the result in the in-

operation.

structions column is not obtained for the

given adjustment, troubleshooting of the

3-5. Starting Procedure

test set is required

Follow the instructions in a through d b e l o w

(4) Instructions. The instructions column gives

before performing any tests specified in paragraphs

the step-by-step procedure for performing the

3-6 through 3-12.

module test. The steps must be performed in

a Preliminary Switch and Control Setting (fig.

numerical order. All switches, connectors, and

3-1). Set the switches and controls on the test set as

meters refereed to in this column are on the test set

follows: POWER switch to OFF, POWER SELEC-

unless otherwise indicated.

TOR switch to 27.5V, and DESPIKE AMPL con-

(5) Test limits. When a test step in the in-

trol to full counterclockwise position.

structions column calls for a meter reading, the

NOTE

meter reading in percent is given in the test limits

All switches and controls other than

column. Usually a minimum and maximum limit for

those listed in a above may be left in any

the reading is specified: however, where only one

desired position.

limit is specified, the other limit (minimum or

maximum) does not exist.

b. preliminary Connections and Adjustments (fig.

c. Arrangement of Tests. Each module test is

3-1).

subdivided into individual tests that can be per

(1) Connect the power cable connector end to

formed on the module. The individual teats are

the POWER INPUT 115/230 VAC connector on the

a r r a n g e d so that any particular test module

front panel.

may be performed without performing the tests

(2) Connect the other end of the power cable to a

preceding it. For example, the variable if receive

115-volt alternating current (at) power source.

gain test given in paragraph 3-6, step 5, my be per-

NOTE

formed on the rf subchassis without performing

If 230-volt operation is desired, refer to

steps 1 through 4. However, all substeps (5a, b, etc.~)

paragraph 2-4 for initial connection.

must be performed to insure that the equipment is

(3) Set the POWER switch to ON.

calibrated for that particular test. The starting

(4) Press the PRESS TO MONITOR

procedure (para 3-5) must be performed before

VOLTAGE switch and check to see that the TEST

plugging a module into the test set.

METER indicates from 60 to 70 percent.

d. Trouble Isolation. If the test limits given for

(5) Set the POWER SELECTOR switch to

each test in paragraphs 3-6 through 3-12 are not

N O R M A L , press the PRESS TO MONITOR

o b t a i n e d , troubleshooting of the AN/ARC-54

VOLTAGE switch and check to see that the TEST

module under test is required.

METER indicates from 60 to 70 percent.

e. Self-Test Procedures. The test set has a self-

(6) Set the POWER SELECTOR switch to

test feature that may be used to detect a misad-

HIGH VOLTAGE, press the PRESS TO

justment or malfunction within the equipment.

MONITOR VOLTAGE switch, and check to see

T h e s e tests can be found in table 4-1, the

that the TEST METER indicates from 60 to 70 per-

Operator/Crew Preventive Maintenance Checks and

cent.

Services.

NOTE

3-4. Types of Operation

If any of the above readings is not within

t h e specified tolerance, perform the

a. Module Tester. The primary purpose of the

procedures in table 4-1, Operator/Crew

test set is to test the individual modules of Radio

Preventive Maintenance Checks and Ser-

Set AN/ARC-54. The front panel of the test set (fig.

vices.

3-1) contains a mating connector for each individual

c. Plugging in Modules (fig. 3-2). When a module

AN/ARC-54 module. Function switches on the test

is to be tested, first set the POWER switch to OFF,

set connect power and simulated loads to the

and then plug the module into the appropriate

various module circuits and a metering circuit

3-5