Specifications

Drawmer - MX50 Manual http://www.drawmer.com/opmx50.htm
3 of 6 1/31/2005 2:44 PM
to the chassis connection on the XLR connector as opposed to connecting to pin1.
The MX50 fully conforms to the EMC standards.
GROUND LOOPS
If ground loop problems are encountered, never disconnect the mains earth, but
instead, try disconnecting the signal screen on one end of each of the cables
connecting the outputs of the MX50 to the patchbay. If such measures are
necessary, balanced (XLR) operation is recommended.
LEVEL CONVERSION
It is possible to apply an input to the MX50 at only one of the two possible levels,
say -10dB via the jack socket, and utilise both of the output levels and cable
options of -10dB and +4dB simultaneously.
One useful example of this connection option would be if the unit was used to
process a keyboard - commonly these have an output level of -10dB, and are
terminated with jack sockets. It is feasible using the MX50s dual output capability
to use the -10dB jack input to feed from the keyboard and the -10dB output
onwards to the amplifier, and the +4dB balanced XLR connector for a direct feed to
the mixing console. This removes the need for any DI box or cable splitter. In this
example, ground loop considerations may be required.
CONTENTS
POWER CONNECTION
The MX50 unit will have been supplied with a power cable suitable for domestic
power outlets in your country. For your own safety it is important that you use this
cable to connect to the mains supply earth. The cable should not be tampered with
or modified.
The internal fuse fitted to the power supply should never blow under normal
operation. If the fuse is suspected of having blown, then a fault will have occurred
and this fault condition MUST be inspected by a qualified service engineer. Under
NO circumstances should this fuse be replaced by yourself. Always comply with
the Safety Instructions.
If, for some reason, the unit is to be operated at a mains input voltage which is
different to that as supplied, the following procedure must be carried out by a
qualified technical engineer. If the voltage change process is to be repeated often,
a simple switch can be fitted to simplify this procedure, this part (item # 7026) is
available via your Drawmer dealer.
1: Disconnect the unit from the mains.
2: Using a number 1 size pozidrive screwdriver, remove the seven
self-tapping
screws that retain the top cover. (Two screws are found along each side;
two
along the top edge at the rear; and the upper screw on the front facia panel).
3: Remove the power supply unit (PSU) module by removing the four
pozidrive
screws: two longer screws (10mm) holding the mains input connector; two
shorter (6mm) along the bottom printed circuit board edge.
For conversion to 115Volt AC (previously set to 230Volt AC)
4a: De-solder and remove the single link marked K1.