ASL INTERCOM PS 6379 Mk2 User Manual page 7

Null Adjustment procedure, for each channel
separately:
• turn the 'Own Voice" (side tone) control knob
to minimum
• set Null Adjust trimmers in start position: fully
clockwise.
• switch off the microphones of all connected
(speaker-) stations
• make sure that there is no automatic
speaker attenuation (turn trimmer #21 fully
clockwise)
• push the TALK button of the channel to be
null adjusted
• slowly turn up the listen volume of the PS
6379 Mk2 (channel + master volume)
• speak into the gooseneck microphone
• adjust the speaker listen level to a minimum
by turning the null adjust trimmers counter-
clockwise (first the LOW trimmer and then
the HIGH trimmer; repeat this a few times)
• Connect a headset (the loudspeaker and
gooseneck mic are now automatically
disabled) and speak into the headset
microphone. Check whether the level of
your voice in the headset can(s) is sufficient.
If not, push this level up by turning the OWN
VOICE knob ( #4) clockwise.
The operating area of the Null Adjust trimmers is
between fully clock-wise and minimum level.
Should the number of user stations on a channel
and/or the length of the party line cable change,
the null for that channel has to be adjusted again.
4. OWN VOICE control knob
With this knob one adjusts the extent to which the
headset mic signal is heard in your headset cans.
User Manual PS 6379 Mk2 / October 2013 © ASL Intercom BV
5 CHANNEL VOLUME knob
To adjust the listen level of the corresponding
channel. Turning a knob fully counter-clockwise
switches that channel off (the channel is disabled,
see also #6).
For as long as the TALK button of an IFB channel
is kept pushed, the Listen function of the intercom
channels is automatically disabled. To achieve
that these Listen functions are not disabled if an
IFB TALK button is pushed, the position of a
certain DIP switch has to be changed. See section
11.0, DIP switch B
6 CHANNEL ON LED indicator
This green LED is lit when the corresponding
channel is switched on. In case the channel is
switched off by the CHANNEL VOLUME knob
(#5), its TALK, CALL and LISTEN controls are
disabled. (Line power to the channel remains).
7 MIC MUTE button
By pushing this button the TALK button of the
corresponding PS 6379 Mk2 channel is disabled,
by which also the TALK buttons on remote
stations are disabled (the ones of the remote
station channels which are connected to the
corresponding PS 6379 Mk2 channel).
A disabled TALK button can be enabled again by
pushing it. The MIC MUTE button of a channel in
IFB mode is automatically disabled
8 BUZZER MUTE button
By pushing this button the buzzers of all stations
connected to the corresponding (party line)
channel can be remotely muted. After being
pushed the Buzzer Mute button is lit.
The buzzers remain being muted until the
BUZZER MUTE button is switched off again (the
Buzzer Mute status is abolished).
The BUZZER MUTE button of a channel in IFB
mode is automatically disabled.
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