M S - 7 0 2 T W O - C H A N N E L M A I N S T A T I O N
3 - 3
10 Ohm chassis ground resistor is
open.
Check the DC resistance for 10 Ohms
between the chassis and pin #1 of any
intercom connector.
If this condition occurs, it is because
the system ground came into contact
with something that was “HOT”
with respect to the power supply
earth ground. Carefully check the
system ground and AC distribution
in the area.
Warning:
This is a potentially
dangerous situation. A shock hazard
may exist between a remote station
headset and ground.
System feedback (Acoustical)
Listen level
control at this station or a
remote station is set too high.
Adjust.
Sidetone null
control at this station or
a remote station is not adjusted
correctly.
Adjust. Refer to the procedure in the
front panel section of this manual.
Channel unterminated.
Set the MS-702 termination switch
for that channel to the
on
position.
A headset extension cord was used.
Headset extension cords are not
recommended.
Excessive crosstalk
High DC resistance in ground return.
Use heavier cable; add additional
conductor(s) to ground return.
Multi-channel
cable pairs are not
individually shielded.
Replace cable with individually
shielded pairs.
Headset cables are not wired properly
or shielded properly.
Correct wiring. Use headsets with
properly shielded wiring.
Program signal sounds distorted.
Overload of
program input
circuit.
Reduce
program input
level or reduce
the gain of the program signal at the
source, such as an audio mixer.
Call signals do not function.
Excessive DC loading of intercom
line.
Remove any audio transformers or
other equipment that may be
connected across the intercom line. If
equipment other than Clear-Com
intercom equipment must be
connected to the intercom line, please
contact Clear-Com application or
service personnel for advice.
SYMPTOM
CAUSE
SOLUTION
