10
7. MUTING FUNCTION
7.1. Manual Mute
Step 1.
Place the Line 2 and/or Line 3 input in Mute Receive (muted) mode using the Function switch No. 5
for Line 2 and No. 6 for Line 3.
Step 2.
Close the Manual mute (+) and (–) terminals.
The Input set for Mute Receive in
Step 1
is muted.
Step 3.
Open these terminals.
The signal being muted returns gradually to its original level in about 1 to 5 seconds.
Note:
This function is active regardless of the Automatic mute ON/OFF setting using the Function switch.
Manual mute and Automatic mute are available for the muting function.
Manual mute is a function to mute the LINE 2 and/or LINE 3 input when the manual mute terminals are
closed.
Automatic mute is an audio-signal activated mute function to automatically mute the LINE 2 and/or LINE 3
input when audio signals enter the MIC/LINE 1 input.
Neither Manual mute nor Automatic mute works on the MOH output.
UNIT
BREAKER
2A
PUSH
RESET
MOH OUT (ZONE2)
SPEAKER OUT (ZONE1)
600Ω
4Ω
18Ω 140Ω
COM
CLASS 2 WIRING
DO NOT USE THESE 4Ω , 25V AND 70V
TERMINALS AT THE SAME TIME.
70V
25V
H
C
E
LEVEL
MOH ASSIGN
1. MIC/LINE 1
2. LINE 2
3. LINE 3
7. AUTO MUTE (MIC/LINE 1)
8. MIC (ON)/LINE (OFF)
4. - - - - -
5. LINE 2
6. LINE 3
MUTE SENSE
MUTE RECEIVE
MANUAL
MUTE
MIC / LINE 1
LINE 3
H
E
LINE OUT
600Ω
H
E
LINE 2
H
E
H
C
+
10
0
10
OFF
ON
0
-
E
Manual mute terminal
Mute sensitivity control
Function switch Nos. 5, 6, and 7
MOH ASSIGN
1. MIC/LINE 1
2. LINE 2
3. LINE 3
7. AUTO MUTE (MIC/LINE 1)
8. MIC (ON)/LINE (OFF)
4. - - - - -
5. LINE 2
6. LINE 3
MUTE SENSE
MUTE RECEIVE
MANUAL
MUTE
MIC / LINE 1
H
C
+
10
0
OFF
ON
-
E
7.2. Automatic Mute
Step 1.
Set the Function switch No. 7 to ON.
The MIC/LINE 1 input is placed in Mute Send mode (audio signal-activated muting mode).
Step 2.
Place the Line 2 and/or Line 3 input in Mute Receive (muted) mode using the Function switch No. 5
for Line 2 and No. 6 for Line 3.
Step 3.
Set the muting level using the Mute sensitivity control.
Adjusts the threshold level for the MIC/LINE 1 input to activate the muting function. Turn clockwise to
increase the threshold level (lower sensitivity), and counterclockwise to decrease it (higher
sensitivity).
Note
The audio signal level to activate muting is independent of input volume settings. So, the Mute
Receive input is muted if a signal enters the MIC/LINE 1 input even when the input volume is turned
down. To avoid unwanted muting caused by unintentional inputs such as background noise and noise
sound, it is recommended to cut the audio signal at the input equipment (such as a microphone with
talk switch).
Step 4.
The Input set for Mute Receive in
Step 2
is muted by the MIC/LINE 1 input audio signals.
Step 5.
When the input signals are not present, the signal being muted returns gradually to its original level in
about 1 to 5 seconds.