Shure SCM410E User Manual page 17

MUTE IN PRECEDENCE TO OVERRIDE IN PRECEDENCE
When both MUTE IN and OVERRIDE IN logic are grounded, the
Override mode will take precedence (as supplied, the MUTE IN takes
precedence over OVERRIDE IN).
DEAD ZONE ON MUTE IN DEFEAT
As supplied, MUTE IN is intended for use as a momentary cough
button or privacy function (mute when necessary). However, if the
MUTE IN is intended to be used so that the talker must unmute
microphones to enable speech pickup (unmute when needed), this
modification is needed. This removes the muted channel from the
MaxBus which eliminates "dead zones." A dead zone is an area in
which a microphone picks up a talker through a muted microphone and
other microphones do not activate for that talker.
CHANGING MUTE IN TO INHIBIT
As supplied, a channel will mute when its MUTE IN terminal is
grounded. The mute function for each channel can be modified so that
a logic "low" at the MUTE IN terminal prevents that channel from gating
on if it is off, but allows it to remain on if it is already on. Use this
modification to enable Filibuster Mode.
IMPORTANT: To prevent high-frequency oscillation, never connect the
GATE OUT to the MUTE IN of the same channel unless the "Inhibit"
modification has been made.
CHANGING OVERRIDE IN TO MUTE IN (FILIBUSTER MODE)
This modification should only be performed with the Change MUTE IN to
Inhibit modification described above. This is only necessary if the Mute
function is desired along with Filibuster Mode.
CHANGING THE OFF-ATTENUATION LEVEL
This procedure changes the off-attenuation level from -13 dB (as sup-
plied). Refer to the following table for attenuation levels and resistor
values.
Off-Attenuation Level
10 dB
13 dB
(default)
20 dB
30 dB
 dB
NOTE: As more Input channels are added to the system, the
off-attenuation increases slightly.
GROUP GATING
With this modification, several channels can be grouped together so that
all of them activate whenever one of them activates. This is useful for
miking choirs.
Resistor Value
18 k
30 k
75 k
250 k
open circuit
Procedure:
1. Short jumper X1005.
2. Remove resistor R1087.
Procedure:
1. Short jumper X1002.
Procedure:
1. Short jumper X1007.
Procedure:
1. Short jumper X1006.
2. Remove resistors R1087 and R1082.
Procedure:
1. Remove resistor R9178.
Install new resistor
2.
Procedure:
1. Locate pad PD1000.
2. Solder a wire from PD1000 to the other channels in the group.
For example, to gate channels 1-3 as a group, solder a wire
connecting PD1000, PD2000, and PD3000.
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at jumper points R9177.