TM 11-6625-828-12
a brush dipped in trichoroethane. Remove excess
with item No. 8 in the daily preventive maintenance
cleaning compound from the brush to prevent it from
checks and services chart (para 4-5) and proceed
dripping into the equipment.
through the items until an abnormal condition or result is
c. Apply a thin coating of Grease, Aircraft and
observed. When an abnormal condition or result is
observed, perform the checks and corrective actions
Instrument (MIL-23827) both the gear and rack teeth,
indicated in the troubleshooting chart. If the corrective
and rotate the ATTENUATOR iv control to distribute the
measures indicated do not result in correction of the
grease evenly over ,he gear and rack.
trouble, higher category of maintenance is required.
4-10. General Troubleshooting Information
contain additional information and step-by-step
Troubleshooting the AN/ARM-5A is based on the
instructions for performing equipment tests and
operational check contained in the daily preventive
adjustments to be used during the troubleshooting
maintenance checks and services chart.
To
procedures.
troubleshoot the equipment, perform all functions starting
4-11. Troubleshooting Chart
Item
NO.
Trouble symptom
Probable trouble
Checks and corrective measures
a. Red indicator lamp
a. Power cable loose, no input power,
a. Tighten power cable connections, check
1
does not light and
defective fuse F101 or F102, or de-
availability of input power (para 4-
tone generator does
fective switch S106.
not start.
gory of maintenance for repair.
b. Red indicator lamp
b. Defective indicator lamp DS101 ---------- b. Replace defective indicator lamp -
(para4-13a. Refer
does not light and
DS101
tone generator
to higher category of
starts.
maintenance.
c. Red indicator lamp
c. Defective tone gener-motor B101 of
c. Refer to higher category of mainte-
lights but tone gen-
MG101.
nance.
erator does not
start.
2
% M meter needle does
Defective resistor R216, electron tube
Refer to higher category
not zero.
V115, ZERO SET control R219, or
of maintenance.
defective meter M102.
3
RF meter needle does
Defective ZERO SET control R218 or
Refer to higher category of maintenance
not zero.
defective meter M101.
for repair.
4
Very slight or no indica-
Defective crystals Y101 or Y101, defect-
Replace
defective crystals
Y101 or Y102 (para 4-13c).
tion on RF meter.
ive switch S105, defective electron
tubes V108, V109, or V110, defective
Refer to higher category
capacitors C141, C145, C150, or C152,
of maintenance for repair.
defective trimmer capacitors C143A,
C143B, C149A, or C149B, defective
chokes L119 or L120, defective resistor
R185, R208, or R212.
5
RF meter needle does
Defective electron tube V102, resistors
Refer to higher category of
not align with the red
R115 or R186, capacitor C112, chokes
maintenance.
LEVEL SET line.
L116, or L118, switch S103, or RF
LEVEL SET control R119.
13
% M meter needle does
Defective capacitors C109, C110, C162A,
Refer to higher category of
not align with the
or C162B: resistors R112, R209, R213,
maintenance.
green line on the up-
R215, or R224, electron tube V116,
per scale.
9960~ MOD control R109, or % M
meter M102.
14
% M meter needle does
Defective electron tube V104, OMNI
Refer to higher category of
not align with the
TRACK switch S101C, MODULA-
maintenance.
green line on the up-
TION switch S102B, S102E, or S102H,
per scale.
capacitors C121A, C121B, or C121C,
discriminator Z101, choke L106, resist-
ors R133, R138, R139, R142, R143,
R161, or R231, or 30 - MOD control
R131.
Change 1 4-5
