PAGE 7
User Manual PS 6379 Mk2 / February 2013 © ASL Intercom BV
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 controls the extent to which
the headset mic signal is heard in your headset
cans.
5 CHANNEL VOLUME knob
With this knob the listen level of the
corresponding channel can be adjusted.
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 On 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.
(11 paginas)
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