Clear-Com MS-222 - MS-222 Troubleshooting; Symptom #1: System Non-Operable; Symptom #2: Red Short LED Illuminated; Symptom #3: Excessive Microphone Background Noise

TROUBLESHOOTING
/
Clear-Cam
MS-222
2-Channel
Main
Station
SECTION
4
/ TROUBLESHOOTING
THE
MS-222
2-CHANNEL
INTERCOM
STATION
Symptom
#1:
System
is non-operable:
GREEN
power
led
is not illuminated
and
the RED
short led is
not illuminated.
CAUSE:
Loss
of
AC power.
REMEDY:
Plug
unit
into dependable
AC source.
CAUSE:
Fuses
could
be blown.
REMEDY:
Replace
fuse(s);
If
it blows
repeatedly,
probably
the powersupply
has
internal
component
failure.
Symptom
#2:
The
RED
short
led stays
illuminated
without
the
GREEN
led pulsing
on
periodically.
CAUSE:
Shorted
or mis-wired
intercom
cable.
REMEDY:
Remove
cables,
one
at a
time,
from
Main
Station
until
faulty
line
is
located.
Check
for shorts
between
pins
1
and
2. When
removing
a
possible
short
waft
for several
seconds
to see
if the
automatic
reset
will
clear
itself.
CAUSE:
Defective
Remote
Station.
REMEDY:
Check
Remote
unit.
Symptom
#3: Excessive
back-ground
noise
pick-up
by microphone.
CAUSE:
Distance
from
mic
to
mouth
is
too
far.
REMEDY:
Move
closer
to mic.
CAUSE:
Too
many
mics
on in
entire
system.
REMEDY:
Turn
off all
unused
mics.
RMK
can
be used
to kill
all Series
500
belt-pack
open
mics.
CAUSE:
Volume
too
high.
REMEDY:
Lower
headset
volume.
11/90
Rev. 1.0
Page
21