Features

• Designed to combine paging with background music
• One active-balanced, XLR microphone input channel
• One active-balanced XLR microphone and 1/4-in. TRS line input channel
• Three STEREO INPUT channels
• Stereo AUX level OUTPUTs
• Stereo MIC/LINE OUTPUTs
• BASS and TREBLE tone controls on the master output
• 1/2-rack chassis
• 12 V phantom power for condenser microphones
• Internal power supply
• Removable power cable
• Ducking function (defeatable)
• Jukebox mute function (defeatable)

Rear Panel

① Power Connector.

Accepts 100-120 Vac (SCM262) or 220-240 Vac (SCM262E).

② Left/Right MIC/LINE Output Connectors.

These 1/4-in. connectors are stereo, balanced outputs for use with professional audio equipment. Controlled by DIP switch.

③ Left/Right AUX Output Connectors.

These phono jacks are stereo, unbalanced outputs for use with consumer stereo equipment.

④ DIP Switches.

These allow you to adjust the SCM262 for specific applications. See DIP Switches.

⑤ Left/Right STEREO INPUTS, 1-3.

These phono jacks are stereo inputs for connection to consumer stereo devices.

⑥ MIC Channel 2 INPUT.

Microphone channel 2 has two available inputs. There is a 1/4-in. connector for balanced/unbalanced line-level connections, or an XLR connector for balanced mic-level connections.

⑦ MIC Channel 1 INPUT.

This is an XLR connector for balanced mic-level connections.

General Application

This is a general setup for most situations which require the combined use of a professional microphone and consumer stereo equipment. Using this general setup, there are several other options available for further adjusting the SCM262 for your sound system. See the diagram on the facing page.

1. Turn all gain controls counterclockwise.
2. Connect L/R STEREO INPUTS of the SCM262 to the L/R stereo outputs of the desired stereo audio equipment (CD players, VCRs, televisions, juke boxes, etc.).
3. Connect microphone(s) to the MIC INPUTS on the SCM262.
4. For microphones which require phantom power, such as condenser microphones, place DIP switch 7 in the down position (phantom power on).
5. Connect the L/R outputs of the SCM262 to the L/R inputs of the amplifier.

   Note: If you are using a consumer stereo amplifier, use the AUX OUTs. If you are using a professional audio power amplifier, use the LINE OUTs. The MIC/LINE and AUX OUTPUTs can be used simultaneously to feed two separate amplifiers.

6. Apply power to the mixer by connecting the supplied power cable between the power connector on the mixer and the appropriate AC power supply. The green POWER LED will illuminate to indicate that the mixer is powered on.

   Note: The SCM262 has no power switch*. It is designed to be plugged into a power strip which supports the whole sound system. A typical power strip will have a power switch, so that when the power strip is powered on, the SCM262 is powered on. (*Power Switch, country dependent).

Paging with Ducking Application

With Ducking on, the SCM262 will automatically sense when someone is talking into one of the microphones and lower the volume of the music so the talker can be heard more clearly. Once the talker is finished, the music resumes.

Use a microphone with an ON/OFF or pushbutton switch for the Paging with Ducking Application. A microphone without a switch will false-trigger, causing unwanted interruptions in the program material.

1. Connect the SCM262 to the sound system as described in General Application.
2. Set DIP switch 3 or 4 to the down position to activate ducking for microphone channel 1 or 2, respectively.
3. Set DIP switch 5 position. The Down position sets the ducking so that the program sound is lowered 20 dB when someone uses a microphone. The Up position sets the ducking so that the program sound is muted when someone uses a microphone.

Jukebox Mute Application

In this application, designed primarily for Jukeboxes, any sound source connected to the STEREO 3 channels will automatically mute any sound coming over the STEREO 1 and 2 channels. This way, a CD player can be playing music, and then when someone plays a song on the Jukebox, the SCM262 will automatically mute the CD player channels and switch to the Jukebox. STEREO 1 and 2 channels will remain muted for about 30 seconds after program material is finished, to allow the jukebox time to move on to the next song.

1. Connect the SCM262 to the sound system as described in General Application.
2. Connect the L/R audio outputs of the jukebox to the L/R inputs of STEREO 3.

   This feature is designed especially for use with jukeboxes, but will work for any equipment connected to STEREO 3.

3. Set DIP Switch 6 to the down position (Jukebox Mute on).

   If the ducking application is used in conjuction with the Jukebox Mute application, then activated microphones will mute or duck the STEREO 3 input.

Internal Modifications

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

Disassembly

To access the printed circuit board (pc board) for internal modifications, use the following steps:

1. Unplug the power cord.
2. Remove the knobs and retainer nuts from the front panel.

   

3. Remove the two screws at each bottom corner of the front panel.
4. Remove the four screws at each corner of the back panel.
5. Slide the back panel and pc board out from the rear of the chassis.

   When reassembling the SCM262, DO NOT OVERTIGHTEN the knob retainer nuts. Use a minimal amount of force to secure the nut (0.6-0.8 N-m (5-7 in-lb)). Damage to the internal components will result if too much force is used.

Rackmount Installation

The SCM262 can be mounted as a single unit or dual-mounted with either another SCM262 or another Shure half-rack unit such as the SCM268 or DFR11EQ. Attach the rackmount brackets using one of the following methods:

Stand-Alone Installation

1. Adhere the four (4) supplied rubber feet to the bottom of the unit at each corner. This will keep it from sliding and protect the table surface.

Fixed Installation

To permanently affix the SCM262 above or below a table, shelf, or counter top, use the following steps:

1. Fasten the straddle brackets to the recessed edges of the chassis using four (4) bracket screws.

   Top Mount: Fasten the straddle brackets to the bottom of the unit.

   Hanging Mount: Fasten the straddle brackets to the top of the unit.

2. Fasten the straddle brackets to the surface using the four (4) supplied wood screws.

Voltage Gain (typical, controls full clockwise)