Clear-Com KB-702GM - Manual (Page 21)

K B - 7 0 2 / K B - 7 0 2 G M T W O - C H A N N E L S P E A K E R S T A T I O N S
3 - 3
TROUBLESHOOTING
SYMPTOM CAUSE SOLUTION
System does not operate. Talk
button does not light. No intercom connection to the
KB-702. If the EB7-4W four-wire
option module is connected, the
KB-702 may not be receiving AC
power. Check connections and cable.
The KB-702 has an internal failure. Unit requires servicing.
Speaker does not operate. Talk
button lights amber when
pressed. Speaker switch turned off, volume
knob turned all the way down, or
channel switch set to unused
channel. Adjust controls appropriately.
Speaker plug or wiring has come
loose. Make sure speaker is connected
internally.
Plug P3 missing on circuit board. Plug P3 must be installed in jack J3
if the EB-TW or EB7-4W options
are not used.
Hum or buzz in system Inductive pickup caused by close
proximity of this speaker station or
connected stations to power lines or
transformers. Relocate the offending unit or
wiring. If the cable run is
exceptionally long, consider adding
and using the EB7-4W four-wire
option module. (Requires an
additional four-wire interface at the
opposite end of the “long run.”)
System feedback (Acoustical) Intercom level control at this station
or another station is set too high. Adjust.
Sidetone null control at this station
or another station is not adjusted
correctly. Adjust. Refer to the chapter
“Operation.”
Channel not terminated. Set the main station or power supply
termination switch for that channel
to the on position.
Channel switch set to an
unconnected channel. If only one intercom line is
connected, set option switch #1 to
the on or closed position to link both
channel switch positions to the same
intercom line.
A headset extension cord was used. Headset extension cords are not
recommended.