9
the 12-pin connector towards the front of the amplifier. Put the transformer in at a slight angle (about 10
degrees), so that it does not touch the section of the wire loom between the control board and the front panel
display. Mind also the micro-switch, the front panel switches and the control board at the back.
See picture on
page 6.
Move the transformer close to the front panel (do not slide it on the base plate – lift it and move). This will
create more space at the back, so that the high voltage wires can be connected. Plug the two wires from the
high voltage power supply into the 2 pins at the lower part of the transformer. Connect also the 4-way
connector and the orange / black wire.
Move the transformer all the way to the rear, to create more room at the front.
Plug the 16-way connector into the display board. If the wire loom has an 18-way female connector fitted, the
2 bottom positions are not used. Make sure the VIOLET wire is at the top and the GREEN wire at the bottom.
Move the transformer to the middle position, trying to line up the holes in the transformer with the holes in
the chassis and the mounting plate. When the holes line up, pull the amplifier so that it overhangs, about 1/3
on the desk and 2/3 out. Make sure somebody is helping during this operation. The back of a chair of suitable
height can be used to help support the amplifier, but make sure someone else is holding it firmly in position.
Insert the screws and washers from underneath. When all 4 screws are in, tighten them firmly using a large
size Philips screwdriver.
Connect the 2 mains wires to the terminal block of the soft start module.
See picture, Page 6
.
Put the cover back and the installation is complete.
4 INSTALLATION ENVIRONMENT
4.1 Required environment
The DX-3 amplifier can be operated at an ambient temperature between 0 and 40° Celsius. It should be
installed in a place with good ventilation and protected from the direct sunlight. At least 5 cm (2”) of free
space must be left at the left and right of the amplifier for ventilation. Do not place any object on top of the
amplifier, especially above the ventilation opening.
An environment free of dust, smoke and high humidity is required, as for any high powered RF amplifier.
Dust or particles resulting from burning fire wood or coal could be responsible for sparks or electrical
discharges between the capacitor plates, or in other parts of the RF section.
4.2
Power requirements
When operating at full power, up to 30A from the 240 VAC mains is required. Ensure that the AC supply you
intend to use is fully rated and properly fused. The Emtron "soft start" circuitry ensures that there are no
momentary surges of current at power-up, therefore the fuse does not need to be over-rated. However, the
wiring of the mains supply for the amplifier should be able to handle the power at full load with minimal drop
in the voltage, to insure the performance of your DX-3 does not suffer.
5 REAR PANEL
The following connectors and controls are present on the rear panel
5.1 Power / Earth connections
A wing-nut Earth connection is provided at the rear of DX-3. A good Earth link must be provided here.
Connect this first, before making any other connection to the amplifier. Two fuse holders are fitted along with
30A, normal acting fuses.
