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Page Title:
Table 5-1. Troubleshooting Chart |
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|  TM 11-5821-285-12-1
Table 5-1. Troubleshooting Chart--Continued
Item
No.
Malfunction
Probable Cause
Corrective Action
should be obtained. If not, request
higher level maintenance to replace
power relay.
a. Check for 27.5 volts dc between JB-1,
2
Panel lamps on associated ICS
a Defective circuit breaker.
box do not light when INT
TB1-20, and ground. If voltage is not
circuit breaker is pushed in.
present, request higher level main-
tenance to replace the circuit breaker.
b. Loose cable connection at rear of unit.
b. Check to insure cable connection is
tight.
c. Defective lamps.
c. Replace lamps (para 5-11).
d. Defective ICS box.
d. Replace ICS box (para 5-6).
a. Defective circuit breaker.
a Check for 27.5 volts dc between JB-2,
3
Panel lamps on FM control head
do not light with associated
TB8-2, and ground for FM-1, be-
FM circuit breaker pushed in
tween JB-2, TB9-2 and ground for
and function switch on FM
FM-2, and between JB-2, TB9-17
control head set to T/R.
and ground for FM-3. If voltage is
not present, request higher level
maintenance to replace defective
circuit breaker.
b. Loose cable connection at rear of FM
b. Check to insure cable connection is
connection at rear of FM control
tight.
head.
c. Defective lamps.
c. Replace lamps (para 5-12).
d. control head.
d. Replace FM control head (para 5-8).
a. Defective circuit breaker.
a. Check for 27.5 volts dc between JB-2
4
POWER-ON indicator on KY-
28 control does not light with
TB9-18 and ground. If voltage
is not SEC circuit breaker
present, request higher level main-
pushed in and POWER
switch at KY-28 control set
to ON
tenance to replace the circuit breaker.
b. Loose cable connection at rear of KY-
b. Check to insure cable connection is
28 control head.
tight.
c. Defective POWER-ON indicator lamp.
c. Replace indicator lamp (para 6-11).
d. Defective KY-28 control head.
d. Replace KY-28 control head (para
a. Loose cable connection.
a. Check to insure cable connection is
5
Power at FM-1, FM-2, or FM-
3 control head not at associ-
tight.
b. Open line filter.
b. Check for 27.5 volts dc at output of
ated FM radio.
associated line filter. If voltage is not
present, request higher level main-
tenance to replace defective line
filter.
c. Defective FM radio.
c. Replace FM radio (para 5-9).
a. Eye on indicator closed.
a Turn outside ring on indicator.
6
SEC indicator lamp does not
b. Defective SEC, FM-l, FM-20or FM-3
b. Replace defective lamp (para 5-11).
light when associated cipher
unit is turned on in cipher
indicator lamp.
c. Defective KY-28 control head.
c. Replace KY-28 control head (para
mode.
a. Defective switch on U-94A/U.
a. Request higher level maintenance to
7
Transmitter will not key from
one operating station.
replace U-94AIU.
b. Defective associated keying relay.
b. Remove power cable assembly and
check between following terminals for
a resistance of 615 ohms 10%:
JB-1, TB7-1, 4, 7, 10, 13 and 16 to
JB-1, TB7-19. If a resistance of 615
ohms 10% is not obtained, request
higher level maintenance to replace
associated keying relay.
8
All or one radio set does not
Loose or poor connection to ICS box.
Check connection to connector on rear of
operate from one ICS box.
ICS box (para 5-6).
Same radio set operates from
other ICS boxes.
A radio set does not operate a. Defective radio set cabling connection.
a. Check all cable connections to radio
9
from any ICS box.
set, cipher equipment, and antenna.
b. Defective facility component.
b. Replace component one-by-one with
known good component.
5-2
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