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MA 4120 480W Mixer Amplifier
User Manual
9
Operating instructions
MIC priority:
During normal operation the MA 4120 MKII features priority for MIC1 over the other microphone and
line inputs. For certain applications, the installation engineer may need to defeat the MIC1 priority
function. In order to do this, the product must be fully disconnected from any AC or DC power sources,
and disconnected from all inputs/outputs.
Remove the 15 screws from the outer casing as per the diagram below and keep in a safe location.
Remove the upper casing and place to one side. Locate the PCB towards the rear of the unit as pictured
below. Carefully move the jumper from the
"ON"
position to the
"OFF"
position. Refit the outer casing,
taking care to avoid damaging the unit. Refit all of the screws to fully secure the outer casing.
Top of Mixer
Rear of Mixer
Side 1 of
Mixer
Side 2 of
Mixer