Shure SCM410E manual Internal Modifications

Page 15

INTERNAL MODIFICATIONS

WARNING: Voltages in this equipment are hazardous to life. No user-serviceable parts inside. Refer all servicing to qualified service personnel.

NOTE:

Only make changes to jumpers (X) and resistors (R). The circuit board contains holes where resistors are to be added.

DISASSEMBLING THE SCM410/SCM410E

For Channel modifications, the first character of the refer- ence designator indicates the channel number,(i.e., R1027 refers to a Channel 1 resistor, X2001 refers to a Channel 2 jumper, etc.). Modifications affecting the Master section are

preceded by a ª9º (i.e., X9001).

All Channel modifications in this section use Channel 1 as an example.

To access the printed circuit board for internal modifications, proceed as follows:

1.Remove the power cord from the ac power source.

2.Remove the knobs, retainer nuts, and washers from the front panel, as shown in Figure 29.

3.Remove the four screws at each corner of the rear panel.

4.Remove the two screws at each bottom corner of the front panel.

5.Slide the back panel and printed circuit board out from the rear of the chassis.

CAUTION: When reassembling the SCM410, DO NOT OVERTIGHTEN the knob retainer nuts.Damage to the inter- nal components will result if too much force is used.

KNOB ASSEMBLY AND DISASSEMBLY

FIGURE 29

MODIFYING THE SCM410 FOR 220±240 VAC, 50/60 HZ OPERATION

As supplied, the SCM410 uses 100±120 Vac, 50/60 Hz power. To modify if for use with 220±240 Vac, 50/60 Hz power, pro- ceed as follows:

1.Disassemble the SCM410 according to the procedures in the Disassembling the SCM410/SCM410E paragraph.

2.Locate Voltage Selector switch SW9001 adjacent to power transformer T9000.

3.Using a screwdriver, turn the center rotor to the 230 position.

4.Locate Fuse F9000 and replace it with a T 50 mA L, 250 V, time lag fuse for 220±240 Vac operation.

5.Replace the power cord with a cord rated for 220±240Vac operation.

MODIFYING THE SCM410E FOR 100±120 VAC, 50/60 HZ OPERATION

As supplied, the SCM410E uses 220±240 Vac, 50/60 Hz pow- er. To modify it for use with 100±120 Vac, 50/60 Hz power, pro- ceed as follows:

1.Disassemble the SCM410E according to the procedures in the Disassembling the SCM410/SCM410E paragraph.

2.Locate Voltage Selector switch SW9001 adjacent to power transformer T9000.

3.Using a screwdriver, turn the center rotor to the 115 position.

4.Locate Fuse F9000 and replace it with a T 125 mA L, 250 Vac, time delay fuse for 100±120 Vac operation.

5.Replace the power cord with a cord rated for 100±120 Vac operation.

INSERTING A 12 DB MIC PREAMPLIFIER PAD

A microphone preamplifier channel gain can be reduced by 12 dB. This may be desirable with high-output microphones.

Procedure:

1.Short jumper X1000.

2.Remove resistor R1006.

DISABLING PHANTOM POWER BY CHANNEL

To disable phantom power for a given microphone input chan- nel, remove the resistor specified in the following table.

Channel

Remove Resistor

 

 

1

R1005

 

 

2

R2005

3

R3005

 

 

4

R4005

15

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Contents Four Channel Automatic Microphone Mixer Table of Contents Front Panel FeaturesDescription Operating PrinciplesRear Panel DIP Switch FunctionsPower On/Off switch on this mixer Not affected by MIC/LINE switchSupplied Hardware InstallationSingle Mixer Half Rack Installation Dual Mixer Full Rack InstallationHanging Mount TABLE-TOP MountingFixed Mounting Top MountLinked SCM410 and SCM810 Mixers SCM410 ConnectionsLinking Multiple Mixers SCM410 ConnectionsLow Cut Filter High-Pass Basic Mixer OperationLimiter Equalizer FunctionsSpecifications Replacement Parts Advanced Functions Logic Connection SpecificationsLogic Equivalent Circuit Diagram Logic ConnectorDisabling the Gating Function Bypass Remote Channel-On IndicatorsSuggested Logic Applications Cough ButtonInhibiting Gating for Unwanted Sounds ªFilibusterº ModeInhibiting Gating for Unwanted Sounds Loudspeaker MutingExternal Logic Devices Remote Volume ControlInhibit Function Diode Isolation of Logic ControlsInternal Modifications Changing Hold Time Inserting AN Input Line PADDisabling the Master Level Control Changing the Limiter ThresholdGroup Gating Changing Override in to Mute in Filibuster ModeDead Zone on Mute in Defeat Changing the OFF-ATTENUATION LevelManual Mode Enable Shorting Mute in to Logic Ground InternallyDisabling Automatic Mixing Function by Channel
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SCM410E, SCM410 specifications

The Shure SCM410 and SCM410E are state-of-the-art automatic microphone mixers designed to enhance audio performance in various professional environments. Known for their reliability and advanced features, these mixers are a popular choice for broadcasters, conferencing systems, and live event productions.

One of the key features of the SCM410 is its Automatic Gain Control (AGC) system, which intelligently adjusts the gain of connected microphones based on their audio levels. This ensures that the output remains consistent, making it ideal for situations where multiple speakers might share the microphone, such as panel discussions or meetings. The SCM410E variant further enhances this functionality with extended connectivity options, catering to more complex audio setups.

Both models incorporate Shure's exclusive IntelliMix technology. IntelliMix employs sophisticated algorithms to minimize interference and eliminate feedback, which is crucial for maintaining intelligibility in crowded sound environments. The mixers automatically manage the microphone levels, activating only those that are in use while suppressing those that are not, which not only enhances audio clarity but also helps in reducing background noise.

The SCM410 features four microphone inputs, allowing operators to connect multiple microphones simultaneously. Users can easily control each input's level, with individual gain adjustments and a master output level control. Additionally, LEDs provide visual feedback on the status of each microphone, indicating when they are active or inactive. The SCM410E goes a step further, offering additional mic input options and enhanced flexibility for integration into larger systems.

Durability is a hallmark of the SCM410 and SCM410E, as they are constructed with high-quality materials, designed to withstand the rigors of professional use. The intuitive interface makes them accessible for both novice users and seasoned sound engineers.

With a phantom power switch for condenser microphones, an easy-to-read, backlit display, and robust connectivity options, the SCM410 and SCM410E are versatile tools for any audio setup. Their ability to automatically mix and control audio levels in real-time ensures that users can deliver presentations, discussions, and performances with clarity and confidence. Whether it’s in a corporate boardroom or a live concert venue, these automatic microphone mixers deliver high-quality sound tailored to the needs of modern audio applications.