Clear-Com MS-702 - Manual (Page 23)

C l e a r - C o m ®
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 I n s t r u c t i o n M a n u a l
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