Instruction manual

TROUBLESHOOTING
/ Clear-Com
CS-222 2-Channel Main
Station
Symptom
#4:
Hum or buzz
in system.
CAUSE: inductive
pickup caused
by close proximity of Main
or Remote station
to
power
lines or transformers.
REMEDY: Relocate offending
unit.
CAUSE: 10 Ohm chassis
ground resistor (R224)
is open.
REMEDY:
Check the DC
resistance for 10 Ohms
between the chassis and
pin-1 of
any
intercom connector.
R224
is located on the
Rear Panel Connector
Printed Wiring
Board. If this
condition happens
It Is because
the
system ground
came In contact with something
"Hors with respect
to
the Main Station
Earth
ground.
Should this
occur, we
recommend
you carefully
check the system ground and
AC distribution In the
area.
NOTE:
THIS IS A POTENTIALLY
DANGEROUS
SITUATION; IF IT
OCCURS,
A SHOCK HAZARD
MAY EXIST
BETWEEN
THE METAL
BOOM OF A HEADSET
AND GROUND.
CAUSE:
inductive pick-up by headset
mic; check by switching mic on
and off.
REMEDY:
Move mic away from "hum field".
Symptom
#5: System feedback.
CAUSE: Acoustical.
REMEDY:
Volume too high at one station.
REMEDY: Two or more
speaker stations have mics
on simultaneously.
REMEDY:
Headset-mis-wired.
Rewire headset connector.
REMEDY: Headset
laying on table and microphone
on. Turn mic off.
REMEDY:
Headset quality. Some headsets
have poor isolation between
the
microphone
and earphone. Adjust sidetone.
CAUSE: Electrical.
REMEDY: Check
Termination.
REMEDY:
Check sidetone levels.
REMEDY:
A headset extension
cord was used.
Headset extension cords
must be
used
with great care and are not recommended.
Symptom #6: Audio
sounds low and distorted
and the Call light stays on.
CAUSE:
An ultrasonic oscillation is present.
REMEDY:
Headset mis-wired.
Rewire headset connector.
REMEDY: A
headset extension cord
was used. Headset
extension cords must be
used with great care and are not recommended.
11/90 Rev. 1.0
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