Specifications

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).