20
E-200 SERIES INTERCOM SYSTEM — EF-200 DUAL CHANNEL MASTER STATION
7. SPECIAL OPERATIONS
In order to set-up some of the master station possibilities, the unit must be opened removing
the eight screws of the unit top cover, and for the input and output transformers placement also the
eight screws of the unit bottom cover, to solder the transformers.
NOTE:
This type of operations takes place with the unit is opened; the best thing should be to carry it
out by a qualified technician.
DANGER:
Before opening the unit, disconnect it from the mains. It is important to indicate that
although the unit is switched off (with the power switch in 0 position), if it keeps being connected to
the mains there are different parts of the unit that are subjected to high voltage.
CAUTION:
Protect the master station from the rain and moisture, mostly if it is open. If liquid is spilled
into the unit, disconnect it from the mains and consult a qualified service technician.
PROGRAM INPUT TRANSFORMER (IT-DA)
In order to improve the input common mode rejection ratio and for a galvanic isolation with
the previous part of the audio system, an input transformer is available.
The program input has an insert point for the input transformer (TR2) placed just beside the
XLR-3-31 program input connector, in the rear right corner of the main PCB.
Before placing the transformer, you should remove the two links corresponding to the
program input transformer (LK3 and LK4).
In the following picture is shown the placement of the input transformer TR2. It is important to
keep in mind the placement of the input transformer pins to make it coincide with the main PCB
(four behind and three forward).
Remove the links corresponding to the program input
transformer (LK3 and LK4).
Place the input transformer, keeping in mind the position of their
pins (four behind and three forward), and solder it to the main PCB.
OUTPUT TRANSFORMER (OT-DA)
In order to make a galvanic isolation with the next part of the audio system, an output
transformer is available.
The PA output has an insert point for the output transformer (TR1) placed just beside the XLR-
3-32 pa output connector, in the rear right corner of the main PCB.
The following picture is showing the placement of the output transformer TR1. It is important
to keep in mind the placement of the output transformer pins to make it coincide with the main
PCB (seven behind and six forward).
Before placing the transformer, you should remove the two links corresponding to the pa
output transformer (LK1 and LK2).
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