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TM 11-5895-878-14&P
Item
Trouble Symptom
Probable trouble
Check and corrective maintenance
If continuity is not obtained at either NC1
or COM1, check associated diode.
Refer to appendix D, symbol CR1, for
parts location.
2
Audible tone from audible
Defective lamp.
a. Depress switch SW1 and then SW2.
alarm panel without any
All Tellites should glow. If any Tellite
indication on alarm panel
fails to illuminate, replace bulbs.
b. If all Tellites fail, check circuit
breakers (CB1) located on front panel
(reset if found deactivated).
3
Equipment is known to be in
Gnd not being extended from
Remove the appropriate patch from IDF
an alarm condition with
equipment to alarm panel.
and check for gnd on the lead coming
no alarm indication given.
from the defective equipment. If ground
is not present, check for open circuit
working toward defective equipment. If
ground is found, replace the jumper and
remove connector from rear of alarm
panel. Check appropriate pin number
(1 through 90), on the cable connector,
assigned to extend ground from the
defective equipment to the alarm panel.
If ground is not present, make a
continuity check from the connector to
the IDF block. After the check is
satisfactorily completed, replace the
IDF patch.
4
Audible: alarm interrupted only
Tellite hold coil open.
In order to check the Tellite coil, it will
while Tellite is depressed.
be necessary to remove the panel from
the bay to gain access to the
component parts. With the top and
bottom covers removed, a reading of
approximately 340 ohms across pins 4.
and 5 indicates a good coil while an
open reading will require the
replacement of the Tellite.
4-6

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