Shure Four Channel Automatic Microphone SCM410 - Manual (Page 16)

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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.
Procedure:
1. Short jumper X1006.
2. Remove resistors R1087 and R1082.
CHANGING THE OFF-ATTENUATION LEVEL
This procedure changes the off-attenuation level from -13 dB (as
supplied). Refer to the following table for attenuation levels and resis-
tor values.
NOTE: As more Input channels are added to the system, the
off-attenuation increases slightly.
Procedure:
1. Remove resistor R9178.
2. Install new resistor at jumper points R9177.
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.
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 con-
necting PD1000, PD2000, and PD3000.
SHORTING OVERRIDE IN TO LOGIC GROUND INTERNALLY
This modification is equivalent to shorting one of the channel OVER-
RIDE IN to the LOGIC GROUND pin via the high density DB-15 logic con-
nector. With this modification, a channel is always on.
Procedure:
1. Short jumper X1003.
SHORTING MUTE IN TO LOGIC GROUND INTERNALLY
This modification is equivalent to shorting a channel MUTE IN to the
LOGIC GROUND pin via the high density DB-15 logic connector. With this
modification, a channel is always muted.
Procedure:
1. Short jumper X1004.
DISABLING AUTOMATIC MIXING FUNCTION BY CHANNEL
This modification removes a given channel from the IntelliMix automat-
ic mixing circuitry, so that a source such as music can be played through
a channel of the SCM410 without affecting the automatic mixing of the un-
modified channels.
Procedure:
1. If necessary, modify the channel input to accept line level sig-
nals. Refer to the
Inserting an Input Line Pad paragraph.
2. Modify the channel's Override In to On. Refer to the Shorting
Override In to Logic Ground Internally paragraph.
3. Short jumper X1001 to remove the channel from the MaxBus.
4. Remove R1064 to remove the channel from the Last Mic
Lock-On Bus.
MANUAL MODE ENABLE
This modification defeats the automatic mixing functionality of the
SCM410, so that it operates as a standard 4 x 1 mixer.
Procedure:
1. Short jumper X9001.
Off-Attenuation Level Resistor Value
10 dB 18 k Ω
13 dB
(default)
30 k Ω
20 dB 75 k Ω
30 dB 250 k Ω
∞ dB open circuit