Balanced Inputs - Yamaha EM-300B Operating Manual

4. As in the preceeding instructions, align the arrow on
the BT-150 with the arrow in the transformer compart-
ment, and insert the module firmly onto the connector
socket. (Refer to Figure 7).
5. Replace the 4 phillips head screws, removed in step 1,
to secure the module to the mixer. {Refer to Figure 4.)
NOTE: The bottom right-hand screw set in approxi-
mately 1/2" to the left of the module's bottom right
corner to ensure proper orientation of the BT- module.
6. Channels 1 through 6 now have balanced "LO-Z"
inputs. Channels 7 through 12 remain as they were,
with unbalanced "LO-Z"' inputs. It is advisable to label
the mixer's rear panel accordingly.
Figure 7
WARNING REGARDING OPERATION WITH BALANCED INPUTS
When an EM mixer's input has been balanced by instal- input. This precaution is necessary to prevent transformer
lation of any BT- transformer module, the "+4" position saturation and consequent distortion. The "+4 setting
of the Input Level switch should no longer be used for may be used for signal sources plugged into the channel's
signal sources plugged into the channel's "LO-Z'' XLR . "HI-Z" phone jack input.
RESTORING A TRANSFORMER BALANCED MIXER TO UNBALANCED OPERATION
The procedure for restoring an EM mixer to its original module from the mixer, be sure you withdraw only the 4
unbalanced configuration is the opposite of that for instal- outermost phillips head screws; the other 4 screws hold
ling the BT- transformer module. When removing the BT- һе module together.
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