ASL INTERCOM PS 155 User Manual download pdf (Page 9)

User Manual PS 155 / Issue 1

8

2001 ASL Intercom, Utrecht, Holland.

9

10.0 INTERNAL CONTROLS

To access these trimmers you need to

open up the unit.

Disconnect the unit of all other equipment

and then remove the cover.

- Open the PS 155 by removing the two

screws at either side.

Then carefully connect the unit to the

intercom and to the wireless unit.

OUTPUT GAIN (R4)

The output gain can be adjusted

internally by a trimmer R4.

The trimmer is located on the PCB board

at the left, near to the transformers.

To increase mic gain turn clockwise.

To decrease mic gain turn counter

clockwise.

CALL DETECT (R29)

The level of the CALL detect can be

adjusted with this trimmer.

Set the TX MODE switch at the front panel

(9) in the position CALL

Press and hold a CALL button on a

connected station and adjust the trimmer.

If the trimmer is turned too much counter

clockwise the relay of the interface will be

interrupted every second. This is also

shown by the Rx/Tx LED.

If the trimmer is turned too much clockwise

the interface will have 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.

VOX DETECT (R9)

This trimmer adjusts the attack of the

VOX switch.

To adjust this trimmer select the VOX mode

with the TX MODE switch at the front panel.

Connect an intercom station to the same

intercom line and speak into that

microphone.

First adjust the LEVEL and RELEASE

trimmers at the front panel. Then adjust the

attack with the internal trimmer

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