Clear-Com KB-701 - Manual (Page 16)

K B - 7 0 1 S P E A K E R S T A T I O N 3 - 2
TROUBLESHOOTING TIPS
SYMPTOM CAUSE SOLUTION
System does not operate. The
talk button does not light. (1) No intercom connection to the
KB-701. If the EB7-4W four-wire
option module is connected, no AC
power is reaching the KB-701. (1) Check connections and cable.
(2) The KB-701 has an internal
failure. (2) Unit requires servicing.
System operates incorrectly.
The talk button does not turn
amber when the talk button is
pressed, or stays amber until
talk button is pressed and the
speaker is off when it should be
on. (1) Operating mode switches are set
incorrectly. (1) Refer to the option switch setting
section of this manual.
Speaker does not operate. The
talk light turns amber when talk
button is pressed. (2) Intercom level knob turned all the
way down. (2) Adjust control appropriately.
(3) Speaker plug or wiring has come
loose. (3) Make sure speaker is connected
internally.
(4) Plug P3 missing on circuit board. (4) Plug P3 must be installed in jack
J3 if the EB7-4W or EB7-TW option
is not used.
Hum or buzz in system. (1) Inductive pickup caused by close
proximity of this speaker station or
connected stations to power lines or
transformers. (1) 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 a “long run.”)
System feedback (Acoustical). (1) Intercom level control at this
station or another station is set too
high. (2) Adjust.
(2) Channel unterminated. (2) Set the main station or power
supply termination switch for the
appropriate channel to the on
position.
(3) The KB-701’s microphone is too
close to an open speaker on the same
channel. (3) Change the unit’s location.