Shure SCM410E manual Changing the Limiter Threshold, Changing Hold Time, Local AUX Operation

Page 15

CHANGING THE LIMITER THRESHOLD

To change the limiter threshold from the preset value of +16 dBu, modify the circuitry according to the following table.

CHANGE LIMITER THRESHOLD

Limiter

Limiter

X9003

R9149

R9142

Threshold (dBu)

DIP switch

 

 

 

 

 

 

 

 

0

On

--

Remove

20k

 

 

 

 

 

+4

On

Short

--

--

 

 

 

 

 

+8

Off

Short

--

--

 

 

 

 

 

+12

On

--

Remove

110k

 

 

 

 

 

+16

Οn

--

--

--

(default)

 

 

 

 

+20

On

--

Remove

300k

 

 

 

 

 

+24

On

--

Remove

400k

 

 

 

 

 

CHANGING HOLD TIME

To change the hold time from the preset value of 0.4 seconds, modify the circuitry according to the following table.

CHANGE HOLD TIME

Hold Time

X9000

R9073

R9079

(seconds)

 

 

 

 

 

 

 

0.3

--

--

2M

 

 

 

 

0.4 (default)

--

--

--

 

 

 

 

1.0

Short

--

--

 

 

 

 

1.5

Short

470k

--

 

 

 

 

LOCAL AUX OPERATION

This modification removes the auxilliary audio from the SCM410 out- puts. Auxilliary audio originates from the aux inputs of the Shure SCM810, SCM800, and AMS8100 mixers when linked to the SCM410.

MUTE IN PRECEDENCE TO OVERRIDE IN PRECEDENCE

When both MUTE IN and OVERRIDE IN logic are grounded, the Over- ride mode will take precedence (as supplied, the MUTE IN takes prece- dence over OVERRIDE IN).

DEAD ZONE ON MUTE IN DEFEAT

As supplied, MUTE IN is intended for use as a momentary cough but- ton or privacy function (mute when necessary). However, if the MUTE IN is intended to be used so that the talker must unmute microphones to en- able 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 acti- vate for that talker.

CHANGING MUTE IN TO INHIBIT

As supplied, a channel will mute when its MUTE IN terminal is ground- ed. 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.

Procedure:

1.Remove resistor R9187.

Procedure:

1.Short jumper X1005.

2.Remove resistor R1087.

Procedure:

1. Short jumper X1002.

Procedure:

1.Short jumper X1007.

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.

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Contents Model SCM410/SCM410E User Guide Table of Contents Front Panel FeaturesDescription Operating PrinciplesDIP Switch Functions DIP SwitchesRear Panel Installation Supplied HardwareRack Mounting Hanging Mount TABLE-TOP MountingFixed Mounting TOP MountSCM410 Connections Linking Multiple MixersLinked SCM410 and SCM810 Mixers LOW-CUT Filter Effects HIGH-FREQUENCY Shelving Effects Basic Mixer OperationLimiter Equalizer FunctionsA15LA SpecificationsAdvanced Functions Logic Connection SpecificationsLogic Equivalent Circuit Diagram Logic ConnectorCHAIRPERSON-CONTROLLED Muting Remote CHANNEL-ON IndicatorsSuggested Logic Applications Cough ButtonFilibuster Mode Inhibiting Gating for Unwanted SoundsLoudspeaker Muting External Logic Devices Remote Volume ControlInhibit Function Diode Isolation of Logic ControlsInternal Modifications Knob Assembly and DisassemblyMute in Precedence to Override in Precedence Changing the Limiter ThresholdChanging Hold Time Local AUX OperationGroup Gating Changing Override in to Mute in Filibuster ModeManual Mode Enable Changing the OFF-ATTENUATION LevelCaribbean
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SCM410E, SCM410 specifications

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