Shure SCM810 manual Internal Modifications, Disable Master Level Control

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INTERNAL MODIFICATIONS

WARNING: All modifications must be performed by qualified service tech- nicians.

This section describes SCM810 modifications that can be made using sol- der “jumpers” on the printed circuit board; the pads where jumpers may be used are placed close together so that a single solder drop functions as a jumper. Note too that:

1.he only printed circuit board legends used for these modifications are jumpers (X's) and resistors (R's).

2.Where resistors are to be added, through-holes are present on the board.

3.For individual channel modifications, the first number of the reference designation refers to its channel number, i.e., R1027 refers to a Chan- nel 1 resistor, X7216 refers to a Channel 7 jumper, etc. All references to Channels 1 through 8 in the following paragraphs use Channel 1 jumpers and resistors as reference. Modifications affecting the Master section are preceded by the number “9" (X901, etc.).

To gain access to the main printed circuit board, remove the 8 Phillips head screws securing the top cover, and remove the top cover. Most modifica- tions can be made from the top of the main board.

Line-Level Output to Mic-Level Output

Procedure: Short jumper X901. Remove resistors R900 and R909.

Disable Master Level Control

The Master gain control can be disabled so it cannot be tampered with. The table indicates the resistor value to be used for the desired gain.

Procedure: Remove resistor R9230. Install new resistor at jumper X914.

Master Section Gain

Resistance

 

 

-6 dB

5.1 kΩ

 

 

0

10 kΩ

 

 

6 dB

20 kΩ

 

 

Change Limiter Threshold

All three threshold settings (+16, +8 and +4 dBm) can be changed. To shift the threshold down by 6 dB, resistor R will be 82 kΩ. To shift the limiter thresholds up by 6 dB, R will be 330 kΩ.

Procedure: Remove resistors R9177 and R9180. Install new resistor R at jumper X907.

Local Aux Operation

With linked mixers, the Aux input from a modified mixer does not link. Procedure: Remove resistor R9024.

Direct Out to Post-Fader

A channel's Direct Out phone jacks can be changed from pre- to post-fader.

Procedure: Short jumper X106. Remove resistor R1011.

Direct Out to Post-Fader Send/Return (Insert)

Changes a channel's 1/4-inch Direct Out jack to a post-fader insert point. Send is tip of phone jack; return is ring. Insert jacks are useful for inserting line-level signal processors into a channel. For instance, a parametric EQ or compressor/limiter can be inserted into a channel for additional process- ing.

Procedure: Short jumpers X101, X102, X105 and X106. Remove resistors R1011 and R1020.

Direct Out to Gated Direct Out

This post-fader, post-EQ channel output is gated, but without NOMA. In this mode, if the Local/Global switch is in “Local”, a manual mix of channel in- puts is present at the Line output. The Off-Attenuation level of the Gated Direct Out signal is infinite.

Procedure: Short jumpers X104 and X906 (in Master section). Remove re- sistor R1011.

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Contents SCM810/SCM810AZ EIGHT-CHANNEL Microphone Mixer Table of Contents Operating Principles System FeaturesDescription AC Power Connector and Rocker Switch Connector supplies AC Front Panel FeaturesRear Panel Features = Limiter off DIP SwitchesSW702 15 dBRack Mounting the Mixer Installation and System SetupOutput Limiter Settings SCM810/E ConnectionsLow Cut Filter High-Pass Equalizer FunctionsBasic Mixer Operation High-Frequency ShelvingLink Cables Networking Multiple MixersGLOBAL/LOCAL Functions Specifications Replacement PartsAdvanced Functions Logic Connection SpecificationsLogic Function Input Connector Pin No Cough Button Remote Channel-On IndicatorsSuggested Logic Applications Chairperson-Controlled MutingLoudspeaker Muting Filibuster ModeInhibiting Gating for Unwanted Sounds Inhibit FunctionExternal Logic Devices Voltage SelectionDiode Isolation of Logic Controls Digital Controls or MicrocomputersDisable Master Level Control Internal ModificationsSCM810 Speech Gate for Mixing Console Off-Attenuation Level Resistor ValueIncrease Hold Time 米国、 カナダ、 中南米、 カ リ ブ海諸国 :

SCM810 specifications

The Shure SCM810 is a state-of-the-art automatic mixer designed for audio professionals seeking precision and reliability in various environments such as live events, broadcasting, and recording studios. This mixer is an integral part of speech reinforcement and meeting applications, providing seamless integration of multiple microphones while ensuring clarity and minimizing feedback.

One of the defining features of the SCM810 is its automatic mixing technology. It employs an advanced algorithm that intelligently manages microphone levels. Instead of manually adjusting levels for each microphone, the SCM810 automatically reduces the gain of inactive mics while boosting those in use. This results in improved sound quality and prevents unwanted noise interference, allowing for a professional audio experience.

The SCM810 supports up to eight microphones, making it versatile enough for panel discussions, roundtable meetings, or larger conferences. In addition to its mixing capabilities, the device boasts a unique "automatic gain control" system that maintains consistent audio levels regardless of the number of active microphones. This ensures that the audience receives a balanced sound across the room without sudden volume fluctuations.

Another notable characteristic of the SCM810 is its low noise operation. The mixer features high-quality preamps that reduce self-noise, providing clear audio reproduction. This is particularly important in environments where clarity is paramount, such as in broadcast applications. The device also includes individual channel gain controls, allowing audio engineers to fine-tune levels to suit specific needs.

In terms of connectivity, the SCM810 features balanced XLR inputs and outputs, ensuring compatibility with a wide range of professional audio equipment. Additionally, it is equipped with a built-in signal processing capability, including a 3-band EQ per channel, which allows for further customization of the audio signal.

Robust and reliable, the Shure SCM810 is built with durability in mind, making it suitable for both permanent installations and portable setups. Its intuitive front-panel controls simplify operation, ensuring that even less experienced users can achieve high-quality audio without extensive training.

In summary, the Shure SCM810 automatic mixer stands out in a crowded market with its advanced automatic mixing algorithms, low noise operation, versatile connectivity, and durable construction. It's an essential tool for anyone requiring dependable, high-fidelity audio control in diverse applications, helping to elevate the audio experience to a professional standard.