SECTION II. ORGANIZATIONAL TROUBLESHOOTING

11-6625-2843-14

S e c t i o n II. ORGANIZATIONAL TROUBLESHOOTING

however, if the symptom disappears, the trouble is

4-4.

General

probably caused by a defective power source, a defec-

When a test set malfunction occurs, do not assume the

tive test cable or an improperly selected test cable.

test set is defective without first eliminating the power

source and improperly connected cables as a possible

4-5.

Troubleshooting

Procedures

source of trouble. A positive way to eliminate these two

Table 4-2 describes the symptoms of defective opera-

items is to perform the self-test procedure (para 2-4)

tion, the probable causes of the symptoms, and the

while operating the test set from a completely new

remedial action to be taken. Any malfunction that is

power source. If the symptom persists, the trouble is

beyond

the

organizational

maintenance

category

should be referred to direct support maintenance.

probably caused by a defective power cable or test set;

Table

4-2.

Oraganizational

Troubleshooting

Procedures

Symptom

Corrective action

Probable cause

Replace

fuse.

Blown

fuse.

P O W E R 16 indicator

does

not

light

when

b. Replace lamp.

POWER 17 switch is ON.

b. D e f e c t i v e

lamp.

Disconnect

unit.

2. Fuse blows with unit under teat connected.

Faulty

unit

under

test.

b. Replace

teat

cable.

b. F a u l t y t e a t c a b l e .

Check

tubes.

tuba

are

good,

replace

ser-

Faulty

servoamplifier.

AMPLIFIER

control

does

not

increase

voamplifier.

gain

when

rotated

clockwise

and

TEST

SEL 2 switch is in SERVO position.

S e c t i o n Ill. ORGANIZATIONAL MAINTENANCE

disassembly and reassembly of the test set. The index

4-6.

General

number and the figure are given in parenthesis after

Organizational maintenance is limited to cleaning the

each item.

test set; and removal and replacement of defective con-

trol knobs, fuses, and tubes. Replace these items when

4-8. Removal of Panel Assembly From Case

required.

Considerable torque is required to remove the screws

(1, fig. 4-1), so be careful to avoid damage from slipping

4-7. Removal and Replacement

screwdriver. Remove the panel assembly from the case

Disassemble the test set only to the extent necessary to

by removing the 16 screws that secure the front panel

make the repairs. Removal of the panel assembly from

(2) to the case (3).

t h e case will permit most checks and repairs to be

made. The following procedures are to be used in the

4-2