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CHAPTER 4. ORGANIZATIONAL MAINTENANCE INSTRUCTIONS - TM-11-6625-2843-140017
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TM-11-6625-2843-14 Test Set Synchro TTU-23/E Manual
Next
Figure 4-1. Removal of panel assembly from case.
TM
11-6625-2843-14
S e c t i o n II. ORGANIZATIONAL TROUBLESHOOTING
however, if the symptom disappears, the trouble is
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
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;
Oraganizational
Troubleshooting
Procedures
Symptom
Corrective action
Probable cause
a
Replace
fuse.
a
Blown
fuse.
1.
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.
a
Disconnect
unit.
2. Fuse blows with unit under teat connected.
a
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.
If
tuba
are
good,
replace
ser-
Faulty
servoamplifier.
3.
AMPLIFIER
8
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
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

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