To change the mains voltage, remove the rectangular fuse cap and replace
it so that the correct voltage is indicated by the arrow on the body of the
rectangle. The earth terminal on the IEC connector is permanently
connected to the metal casing. The unit is supplied with the 0V electronic
reference ground taken to the case via an internal ‘signal ground’ lead and
space receptacle, which inserts a ground lift resistor when in the ‘Earth Off’
position. To connect the 0V electronic reference direct to the chassis
ground, use a pair of pliers to pull off the space receptacle from the ‘Earth
Off’ position and push it onto the 0V spade terminal (marked Earth On, on
the PCB).
4
INPUT CONNECTIONS
EMX2A inputs are on female XLR type connectors and are electronically
balanced. Pin 1 is normally open circuit but may be linked to sig 0V or
chassis earth by inserting a link on the PCB. The signal is always applied
between Pin 2 (hot +) and Pin 3 (cold -).
Always use 2-core + screen ‘balanced’ type signal leads, even for
unbalanced circuits. The screen should be regarded as separate from the
signal return, even if they are connected together at one end of the line.
For either balanced or unbalanced operation, always connect the signal
between Pins 2 and 3. The input cable shield should be derived from the
equipment which is sourcing the input provided that normal safety
requirements are met (ie the mains earth is correctly connected).
Martin Audio – EMX2A System Controller
E
NGLISH
3
1
2
3
1
2
3
2
1
3
2
1
3
Source
Source
Chassis
Grounded
Shield
Signal
Grounded
Shield
EMX2A
Input
EMX2A
Input
Ground
Lift
Resistor
Ground
Lift
Resistor
Fig. 1
CONTENTS
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