Mic 3 and 4 are provided in one plug-in module. It can be replaced to
the optional mic input module "U-51".
If setting the U-51, XLR connectors may be provided with balanced
low impedance (30 - 600 ohms) from standard screw type terminals
with unbalanced high impedance (50k ohms).
OPTIONAL MIC INPUT MODULE "U-51"
** Replacing of mic input 3 and 4 **
1) Be sure to unplug the power cable from the wall AC outlet.
2) Unscrew the Mic 3 and Mic 4 input module and pull towards you.
3) Unplug a connector fitted to the mic input module and connect it to
the Mic input module "U-51"
4) Insert the U-51 and tighten two screws.
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U-51