Clear-Com ICS-21, Инструкция по эксплуатации

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I C S - 2 1 / 2 1 D T S P E A K E R S T A T I O N
4 - 2
Speaker does not
operate, but the talk
light comes on when
talk button is pressed. 1.The intercom-level
knob is turned all the
way down.
2.The speaker plug or
wiring has come loose.
1. Adjust control
appropriately.
2. Make sure speaker is
connected internally.
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.
System feedback
(acoustical). The intercom-level
control at this station or
another station is set too
high. Adjust.
System feedback
(acoustical). Channel unterminated. Set the main station or
power supply
termination switch for
the appropriate channel
to the ON position.
System feedback
(acoustical). The station’s
microphone is too close
to an open speaker on
another station. Turn down the speaker
or change the unit’s
location.
Program signal sounds
distorted. The program-level
control is set too high. Turn the
program-level control
counterclockwise.
Program signal sounds
distorted. The program input
circuit is overloaded. Reduce the gain of the
program signal at the
source, such as an audio
mixer.
Rapid clicking noise. 1. Defective wiring or
connectors.
2. Defective IC1 on
710533 assembly.
1. Repair/replace wiring
or connectors.
2. Replace IC1.
SYMPTOM CAUSE SOLUTION
• System feedback can
have three different
causes.
• When the program signal
is distorted, check
whether the program
input is getting too much
signal.