Internal Controls - ASL INTERCOM PS 230 User Manual

6 SPEAKER ATTENUATOR trimmer
To adjust the extent to which the speaker is
automatically dimmed if the gooseneck
microphone is switched on. It prevents unit
feedback if side tone rejection is not sufficient.
It also minimizes system feedback or a 'hollow'
sound when the gooseneck microphones of other
speaker stations on the intercom channel are
switched as well.
Adjustment procedure :
•
make sure there is no headset connected
•
feed an audio signal into one of the
intercom channels (via an AUX input on a
master station or a separate power
supply)
•
turn up the listen volume
•
activate the gooseneck microphone
•
adjust the desired degree of speaker
attenuation (turning the trimmer counter-
clockwise increases the attenuation)
7 BUZZER VOLUME trimmer
To adjust the volume of the internal buzzer. The
buzzer is activated if a CALL button of the PS 230
is pushed (or a CALL button of any other station
on a channel to which the PS 230 is connected)
longer than 2 seconds, provided there is no
'buzzer mute' on one of the channels.
4.0 SIDE PANEL CONNECTORS
11 LINE connector channel A
12 LINE connector channel B
These connectors are for connecting the PS 230
to the party lines of an intercom system.
XLR-3 pin assignments :
1. 0 V /ground shield
2. +30V power wire
3. audio wire
5.0

INTERNAL CONTROLS

Inside the unit there are trimmers to adjust the
mic gain of the gooseneck microphone and the
headset microphone separately.
The trimmers are located on the PC board.
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User Manual PS 230 / October 2013 © ASL Intercom BV
8 HEADSET connector (XLR-4)
To connect a headset to the unit. The headset
can must have an impedance of 200 ohms
minimum. When there 2 cans in parallel each can
must have an impedance of 400 ohms minimum.
The headset microphone may be of the dynamic
or electret type.
XLR-4 pin assignments :
Pin 1. Shield mic. (GND)
Pin 2. mic. +
Pin 3. phones +
Pin 4. phones
If a headset is connected, the speaker and
gooseneck microphone are disabled
automatically.
9 GOOSENECK MICROPHONE
An electret noise canceling gooseneck
microphone. A limiter prevents the microphone
preamplifier from clipping when speaking close
into the microphone
10 LOUDSPEAKER
A high quality 16 Ω loudspeaker
The trimmers can be reached as follows :
•
remove the screws of the bottom plate
•
slide the plate to one side and take it out
•
take away the plastic isolation plate
The trimmers are labeled :
'GOOSE' for the gooseneck microphone
'HEADS' for the headset microphone