ASL INTERCOM PS 6379 Mk2 User Manual page 10

21 SPEAKER ATTENUATOR trimmer
This trimmer adjusts the extent to which the
loudspeaker is automatically dimmed when the
gooseneck microphone is switched on. It
prevents unit feedback if Null Adjust is not
sufficient. It also minimizes system feedback or
a 'hollow' sound when the gooseneck
microphones of other speaker stations (on one
or several of the connected party lines) are
switched on as well. Adjustment procedure :
• make sure that there is no headset
connected
• switch off all TALK buttons of the PS
6379 Mk2.
• feed an audio signal to an intercom
channel (see #9 and #34)
• turn up the listen volume of the PS 6379
Mk2 (selected channel and master
volume)
• activate the gooseneck microphone
(push the TALK button of the selected
channel)
• adjust the desired degree of speaker
attenuation (turning the trimmer
counter- clockwise increases the
attenuation)
22 BUZZER VOLUME trimmer
This trimmer adjusts the volume of the internal
buzzer.
23 IFB DIM FACTOR trimmers
By turning these trimmers, the IFB DIM factor
for channel E and channel F can be set, should
these channels being put into IFB Mode (see
switches #36). The IFB Dim Factor is the extent
to which the AUX signal is dimmed (0% to
100%) when pushing the TALK button of a
channel which is put into IFB mode. If the knob
is fully clockwise, the DIM factor is at its
maximum (100% dimming)
User Manual PS 6379 Mk2 / February 2013 © ASL Intercom BV
24 BACKLIGHT trimmer
If TALK or CALL push buttons are not active,
they are lit white allowing to easily find these
buttons in a dark environment. By turning this
trimmer the light intensity can be adjusted.
25 Master OVERLOAD LED indicator
As soon as more than the allowed maximum
allowed user stations are connected to the PS
6379 Mk2 (the current from the built-in PSU is
in danger to exceed 5A) the red Overload LED
is lit and a circuit breaker disconnects the line
power from all channels. The circuit-breaker
resets (restores line power) automatically 3
seconds after the cause of the overload has
been removed. The LED also lights up red - for
a few seconds - every time mains power is
switched on.
26 MAINS LED indicator
If mains power is switched on (see #31 'Mains
Power On/Off switch') this green LED is lit.
27 DC power LED indicator
If the DC input on the rear panel (see #41)
receives DC power (24 – 30V / 5A) this yellow
LED is lit.
28 HEADSET connector
To this XLR-4 connector of a headset can be
connected. The headset must have a can
impedance of minimum 200 ohms. If the
headset has two cans in parallel, each can
must have an impedance of minimum 400
ohms.
The headset microphone may be of the
dynamic or electret type. .A limiter prevents the
mic pre-amp from clipping when speaking close
or loud into the headset microphone.The gain
for the headset microphone can be adjusted by
trimmer #45.
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