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Clear-Com RM-120A Manuel de service Page 28

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IV-C.
Troubleshooting
Symptom
Cause
Remedy
System
non-operable;
A.
loss
of
AC
power
A.
plug
unit
into
dependable
power
switch
not
lit
or
AC
source
B.
internal
fuse
is
B.
replace
fuse;
if
it
blows
blown;
could
be
repeatedly,
bridge
rectifier
caused
by
power
or
other
component
probably
supply
failure
shorted
inside
power
supply.
Have
power
supply
fixed.
…______________________________________________________________________________
Circuit
breaker
A.
shorted
or
mis-
A.
remove
cables,
one
at
a
time,
trips
repeatedly;
wired
cabling
from
main
station
until
short
circuit
LED
faulty
line
is
located;
check
remains
lit
for
shorts
between
Pins
I £
2
B.
defective
remote
B.
check
remote
units
station
_____-________________________________________________________________________
Hum
or
buzz
in
A.
inductive
pick-up
A.
relocate
offending
unit
system
caused
by
close
proximity
of
main
or
remote
station
to
power
lines
or
transformers.
B.
ground
loop
caused
B.
reverse
power
cord,
lift
by
improper
ground-
ground
(see
Section
11).
of
system.
C.
10
ohm
chassis
C.
check
resistance
between
ground
resistor
(R14)
chassis
and
Pin
I
of
conn-
in
power
supply
is
ector;
it
should
be
10
ohms.
open*
If
not,
open
power
supply
and
replace
resistor.
D.
inductive
pick-up
D.
move
mic
away
from
"hum
by
headset
mic;
field"
or
use
carbon
or
check
by
switching
electret
headset.
mic
on
and
off.
_____-________________________________________________________________________
Excessive
background
A.
distance
from
mic
A.
move
closer
to
mic
noise
pick-up
by
mic
to
lips
is
too
far
B.
volume
too
high
B.
turn
down
headset
or
speaker
volume
C.
too
many
mics
on
C.
turn
off
all
unused
mics
in
system
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