TM 11-6625-255-14/TO 33A1-13-170-1
Table 5-1. Organizational Preventive Maintenance Checks and Services -- Continued
Interval
Interval
work
and
and
Item to be inspected
time
Item to be ispected
sequence No.
sequence No.
procedure
procedure
(m/h)
M
M
Q
Q
plete, serviceable, and current.
4
TRANSFORMER TERMINALS
0.1
2
MODIFICATIONS
0.1
Inspect the terminals on the power
C h e c k DA Pam 310-7, and insure
transformer. There should be no evi-
that all applicable MWO's have been
dence of dirt or corrosion.
0.1
applied. All URGENT MWO's must
5
RESISTORS AND CAPACITORS
b e a p p l i e d immediately,
ALL
Inspect the resistors and capacitors
R O U T I N E MWO's must be sched-
f o r cracks, blistering, or other de-
uled.
fects.
3
6
SPARE PARTS
0.1
0.1
Inspect all accessories and spare
Inspect insulators, bushings, and
parts for general condition and
sleeves for cracks, chipping, and ex-
method of storage. There should be
cessive wear.
0.1
n o evidence of overstock, and all
7
INTERIOR
shortages must be noted on valid req-
Clean interior or chassis and cabinet,
uisitions.
PUBLICATIONS
1
0.1
S e e that all publications are com-
Section IV. ORGANIZATIONAL TROUBLESHOOTING
58. Physical Tests and Inspection
57. General
Troubleshooting the spectrum analyzer is based
a. Failure of the spectrum analyzer to operate
properly can be caused by one or more of the fol-
upon the operational check (para 3-5 through
lowing faults:
3-11). Perform all functions of the spectrum
( 1 ) Worn, broken, or disconnected power
analyzer as outlined in Chapter 3, until an ab-
normal condition or result is observed. Note the
cord or plug.
abnormality y and refer to table 5-2, organizational
(2) Burned-out fuses.
troubleshooting. Perform the check and corrective
(3) Power cord-not grounded properly.
(4) Defective tubes.
action indicated for the particular malfunction. If
the corrective measures indicated do not result in
b. Inspect all cabling and the general condition
o f the spectrum analyzer before removing the
correction of the trouble, higher maintenance
e l e c t r o n tubes.
category repair is required.
c. Refer to the organizational troubleshooting
p r o c e d u r e s outlined in table 5-2, in order to
localize the trouble.
Table 5-2. Organizational Troubleshooting
Malfunction
Corrective action
Probable cause
1. Meter does not indicate.
a. Defective external test leads . . . . . . . . . .
a. Repair or replace test leads.
b. Check and replace fuses F1 and/or
b. Blown fuse.. . . . . . . . . . . . . . .
F2.
c. Higher category maintenance re-
c. Defective meter . . . . . . . . . . . . . . .
quired.
Defective lamp Il. . . . . . . . . . . . . . . . . .
2. Ac power switch is set to ON, and
Replace lamp I1.
pilot lamp does not light.
3. Pilot lamp is dim.
Strapping of power transformer T1 is
Check input voltage against strapping
w r o n g (TS-723A/U or TS-723B/U)
or 115V/230V switch on rear panel
(TS-723C/U or TS-723D/U) is in
wrong position.
Defective tube . . . . . . . . . . . . . . . .
Check tubes V7 through V14, and re-
4 . With signal applied, and function
place if defective.
switch set to METER, pointer
deflects to right stop.
Defective
tube. . . . . . . . . . . . . .
6 . With s i g n a l a p p l i e d a n d f u n c t i o n
Check tubes V2 through V6, and replace
if defective.
switch set to NOISE, point-
er deflects to right s t o p ,
6 . With signal applied and function
Defective function switch S4 . . . . . . . . . . . . . .
Check switch S4, and repair or replace
switch set to SET LEVEL,
as necessary.
pointer deflects to right stop.
7 . With signal applied and function
Defective bridge circuit . . . . . . . . . . . . .
Higher category maintenance required.
switch set to DISTORTION,
meter indicates 0.
5-2
