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PAGE 9
User manual PS 155 / Issue 2011 © ASL Intercom BV
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11.0
INTERNAL CONTROLS
To access the internal trimmers the PS 155 needs to be opened. Before doing so, disconnect the unit of all
other equipment. Open the PS 155 by removing the two screws of the cover at either side. Then connect
the PS 155 to the intercom party line and to the wireless unit.
OUTPUT GAIN trimmer (R4)
With this trimmer the output gain can be adjusted.
The trimmer is located on the PCB board at the
left, near to the transformers.
To increase the gain, turn clockwise.
To decrease the gain, turn counter clockwise.
VOX DETECT trimmer (R9)
With this trimmer the attack time of the VOX
switch can be adjusted. Proceed as follows:
Set the TX CONTROL select switch to
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Connect a user station to the intercom
party line and connect a headset to that
station
Speak into the headset microphone
First adjust the LEVEL and RELEASE
trimmers at the front panel
Then adjust the attack time with trimmer
R9
CALL DETECT trimmer (R29)
With this trimmer the CALL detect level can be
adjusted. Proceed as follows:
Set the TX CONTROL select switch at the
front panel in the position CALL
Connect a user station to the intercom
party line
Press and hold a CALL button on that user
station
Turn trimmer R29. If the trimmer is turned
too much counter clockwise the internal
Transmit Switch is triggered every second
(this is also shown by the Rx/Tx LED). If
the trimmer is turned too much clockwise
the internal Transmit Switch has a very
long release time when the CALL button of
the connected station is released. Try to
find a suitable position for the trimmer in
between those two points.
12.0
TECHNICAL SPECIFICATIONS
Side Tone (party line)
Rejection : 0
±
35 dB adjustable
Dimensions & Weight
Width: 90 mm / Height: 38 mm
Depth: 124 mm / Weight: 260 grams
