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  TM 11-6625-1702-12
knobs; use a soft, clean cloth. If dirt is difficult
Troubleshooting Information
General
t o remove, dampen the cloth with water; use
Troubleshooting procedures for the equipment
a r e based upon the operational checks in the
mild soap if necessary.
m o n t h l y preventive maintenance checks and
e. R e m o v e r u s t o r c o r r o s i o n w i t h a l i g h t
services chart. To troubleshoot the equipment,
grade sandpaper and repaint the exposed
p e r f o r m all functions starting with sequence
metal surface (para 4-12).
N o . 1 in the monthly preventive maintenance
checks and services chart (para 4-7) and pro-
ceed through the sequences until an abnormal
condition or result is observed. When an ab-
R e m o v e rust and corrosion from metal sur-
normal condition or result is observed, refer to
faces by lightly sanding them with fine sand-
the applicable reference in the troubleshooting
p a p e r . Brush two thin coats of paint on the
c h a r t (para 4-15). Perform the checks and
bare metal to protect it from further corrosion.
c o r r e c t i v e actions indicated in the trouble-
shooting chart. If the corrective measures in-
R e f e r to applicable cleaning and refinishing
d i c a t e d do not correct the trouble, higher
practices specified in TB SIG 364.
c a t e g o r y maintenance is required. Paragraph
4 - 1 6 contains information that is supplemen-
4-13. Lubrication
t a r y to the troubleshooting chart and is too
A n t e n n a Test Set AN/ARM-115 requires no
lengthy or complex to be included in the chart.
When a trouble symptom indicates the use of
lubrication,
a n additional procedure, a reference made to
C a u t i o n : Lubrication may be harmful to
this paragraph appears in the Checks and cor-
the equipment since the equipment is designed
rective measures column of the troubleshooting
to operate in a lubricant-free environment.
chart.
Item
Trouble
symptom
Checks and corrective measures
Probable
trouble
1 Not applicable - - - - - - - - - - - - -
2 a. Meter reading high - - - - - - -
is
Defective
28V
INPUT
load
re-
Higher
category
of
maintenance
(1)
sistor.
required.
Defective
microammeter
is
Higher
category
of
maintenance
(2)
required.
b. Meter
reading
low
is
Higher
category
of
maintenance
Defective
28V
INPUT
load
re-
(1)
sistor.
required.
is
Higher
category
of
maintenance
Defective
capacitor
--
(2)
required.
is
Higher
category
of
maintenance
Defective
microammeter
.
.
(3)
required.
is
Higher
category
of
maintenance
Defective
METER
FUNCTION
(4)
required.
switch.
is
Higher
category
of
maintenance
Short
in
28V
INPUT
associated
(5)
required.
circuits.
(1)
Replace
the
27.5±2
vdc,
2A
fuse
c . Meter reading zero. . . . . . . .
Defective
fuse
.
.
.
.
.
(1)
on
the
control
panel
16).
(2)
Higher
category
of
maintenance
Defective
28V
INPUT
load
re-
(2)
is
required.
sistor.
Defective
microammeter
(3)
(3)
Higher
category
of
maintenance
is
required.
(4)
Higher
category
of
maintenance
Defective
METER
FUNCTION
(4)
is
required.
switch.
+28-volt
dc
line
open
(5)
Higher
category
of
maintenance
(5)
is
required.
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