NAVELEX EE 181-AA-OMI-110/E121 C-9412
Inspect varistors for evidence of
physical damage or overheating.
Check varistors by disconnecting one
lead of each varistor from TB1. Set
multimeter to ohms and connect meter
leads to varistor. Meter should
indicate over 100,000 ohms.
Refer to figures 5-1, 5-2, 5-3, 5-4, and FO-1
and table 5-1 for maintenance controls, parts locations
and identification, and wiring diagram and test points
referred to in table 5-2 troubleshooting procedures.
Before you use table 5-2, be sure you
have performed all applicable operating
The Audible Alarm presents a noise
hazard to personnel in the area. It must
be disabled before any troubleshooting
procedures are attempted.
Disable the Audible Alarm. To Disable The
Audible Alarm (AA) for maintenance or
troubleshooting, notify proper authorities per
installation/site security procedures. Enter the
Control Unit area and turn the operating mode
switch (key operated) to TEST/RESET position.
If the Control Unit audible signal device sounds,
ignore it for the moment. Inspect the Control
Unit door to ensure it is flat, straight, and
completely closed. Open the door, pull the TAS
plunger all the way out, and ensure there is no
debris between the door and enclosure. There
are six LEDs on PC board A12 in the upper right
comer of the Control Unit. Note any of these
LEDs that are on. To locate the source of an
alarm, turn the mode switch to TEST/RESET,
unlock and open the door. Look at the LEDs in
the upper right corner of the
CU. Each detector is connected to one LED.
The first alarm signal received at the CU will light
the LED connected to the detector that
originated the alarm.
If the AA is silenced, don ear
protection and open the AA door. Pull
the TAS plunger all the way out,
remove screws that secure the
faceplate, and remove the faceplate.
The power switch is in the upper left
corner of the AA; turn it off.
If the AA continues to sound, tag,
remove, and isolate the green wire
(from status processor) from TB4-1 in
the Control Unit. Install a jumper
between TB4-4 and 1. AA should be
off. Don ear protection and open the
AA door. Pull the TAS plunger all the
way out, remove screws that secure
the faceplate, and remove the
faceplate. The power switch is in the
upper left corner of the AA; turn it off.
In the Control Unit, remove
interconnecting wire from AA from
TB4-3, and connect a jumper wire
between TB44 and 3. The AA is now
disabled; however, for safety it should
be treated as if it were on. Remove
jumper from TB4-4 and 1.
HIGH VOLTAGE is used in the operation
of this equipment. DEATH ON CONTACT
may result if personnel fail to observe
safety precautions. Learn the areas
containing high voltage in each piece of
equipment. Be careful not to contact high-
Voltage connections when installing or
operating this equipment. Never work on
electronic equipment unless there is
another person nearby who is familiar with
the hazards of the equipment and
competent in administering first aid.