Section II. TROUBLESHOOTING SIMULATOR-TEST SET, RADIO SM-348/ARC-51X

TM 11-6625-564-45

If present, this type of trouble often

in locating the troublesome

stage

may be made to appear by tapping or

quickly.

jarring the equipment. Check the

23. Tools and Test Equipment Required

cables, wiring, and connections of the

The following tools and test equipment are

maintenance kit.

(6) Stage gain procedures. The stage

required for troubleshooting the maintenance

kit. The associated technical manuals and as-

gain procedures given in paragraphs

signed common names are also listed.

2-5 and 2-8 will aid the technician

Test equipment

Technical manual

Common name

TM 11-6626-200-12

DC voltmeter

Multimeter ME-26B/U

Test Set, Transistor TS-1336/U

Transistor teat set

Toolkit

Tool Kit, Radar and Radio Repair

SM 11-4-5180-R08

TK-87/U

Headset H-101A/U

Headset

Audio Oscillator TS-421/U

Audio oscillator

Voltmeter, Meter ME-30(*)/Ua

AC voltmeter

TM 11-6626-320-12

Tube tester

Test Set, Electron Tube TV-7/U

TM 11-6626-274-12

a. lncludes Vo1tmeter, Meter ME-30A/U and Voltmeters, Electronic ME-80B/U and ME-8OC/U.

Section II. TROUBLESHOOTING SIMULATOR-TEST SET,

RADIO SM-348/ARC-51X

2-4. Resistance and Continuity

a. Disconnect all cables from the radio set

simulator.

Measurements

b. Remove the dust cover from the radio set

Make the resistance and continuity measure-

simulator.

ments indicated below. If results other than

c. Set the switch or switches shown in the

those indicated are obtained, isolate the

Switch column to the positions shown in the

faulty part by further resistance measurements

Position column. Connect the dc voltmeter

before making further tests or applying power.

between the terminal in the Terminals column.

Refer to figure 4-8, radio set simulator sche-

Cautions:

1. This equipment is partially transistorized.

matic diagram, figure 4-12, radio set simula-

Observe all precautions to prevent transistor

tor wiring diagram; and to the figures refer-

damage. Make resistance measuremnts in the

enced in the Figure column for terminal and

radio set simulator only as specified.

component location. All resistance readings

should be within 10 percent of those shown in

2. Do not attempt removal or replacement

the Resistance column. These measurements

of parts before reading the instructions given

in paragraph 3-1.

are to be made before applying power to the

unit to insure complete chassis wiring contin-

Note: Unless otherwise indicated, references to test

uity and to localize the trouble before detailed

points, jacks, connectors, and switches apply to the

troubleshooting is performed.

radio net simulator.

Switch

Position

Terminals

Figure

Resistance

(ohms)

A of J2 to 6 of relay K2 ------------

POWER

RESET ON

2-1

A o f J 2 t o 4 o f r e l a y K 2 --------------

TEST SELECT

OFF

2-1

A o f J 2 t o point No. 1 of readout

2-1 and 2-3

mechanism.

A o f J 2 t o 3 s w i t c h S 1 B ---------------

28,700

2-1

A o f 5 2 t o T o f 5 2 ------------------------------

300

2-1