Model SCM800/SCM800E User Guide SCM800/SCM800E EIGHT-CHANNEL MICROPHONE MIXER 27D8469 (Rev. 2) ©2008, Shure Incorporated *27D8469* Printed in U.S.A.
! IMPORTANT SAFETY INSTRUCTIONS ! 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. READ these instructions. KEEP these instructions. HEED all warnings. FOLLOW all instructions. DO NOT use this apparatus near water. CLEAN ONLY with dry cloth. DO NOT block any ventilation openings. Install in accordance with the manufacturer's instructions. DO NOT install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat.
DESCRIPTION The Shure Model SCM800 is a full-featured, eight-channel microphone mixer for sound reinforcement, general audio recording, and audio-visual systems. Any low-impedance, balanced dynamic or condenser microphone, including a wireless microphone system, can be used with the SCM800 mixer. The SCM800 operates on 120 Vac power; the SCM800E operates on 230 Vac power. Both models are supplied with rack-mounting hardware, link cable and removable block terminal connectors.
SCM800 REAR PANEL MODEL SCM800/E REAR PANEL FIGURE 2 11. 12. 13. 14. SCM800: 120 VAC Power Connector and Rocker Switch: Switch turns unit on when power cord is plugged into 120 Vac. 15. DIP Switch: The 7-position DIP switch provides control of the output limiter threshold (see DIP Switches). 16. SCM800E: 230 VAC Power Connector and Rocker Switch: Switch turns unit on when power cord is plugged into 230 Vac. LINK IN/OUT Jacks: Permit multiple SCM800 mixers to be stacked for additional inputs. 17.
SYSTEM SETUP RACK MOUNTING THE SCM800/E To mount an SCM800 or SCM800E in a standard 483 mm (19-inch) audio equipment rack so that the front panel faces out, as shown in Figure 4. Then secure the mixer to the rack with the four supplied Phillips head screws. RACK MOUNTING THE SCM800/E FIGURE 4 SCM800/E CONNECTIONS TO STEREO OR MONO HEADPHONES Refer to Figure 5 and proceed as follows: 1. 2. 3. 4. 5.
LINKING MULTIPLE SCM800 MIXERS Up to four SCM800 mixers can be “linked” using the supplied link cables If additional inputs are needed. Such a configuration can provide 32 mic inputs. Refer to Figure 6. When multiple SCM800 mixers are linked, all input signals appear at all linked mixer outputs––there is no master-slave relationship. The output controls and functions of each linked mixer are post-link and do not affect the signals appearing at other linked mixer outputs.
BASIC MIXER OPERATION 1. Turn on the Power switch. 3. Turn unused channel controls full counterclockwise. 2. 4. 5. Adjust each channel level so that its Overload LED flickers only during very loud speech or noise. Adjust the SCM800 Master level control for the desired output level, as indicated by the output peak meter. 6. Adjust the headphones volume level with the PHONES control knob.
SPECIFICATIONS Polarity Mic/Line, Send inputs to all outputs are non-inverting; Aux input to all outputs is inverting Measurement Conditions (unless otherwise specified): Line voltage 120 Vac, 60 Hz (SCM800) or 230 Vac, 50 Hz (SCM800E); full gain; 1 kHz. Overload and Shorting Protection Shorting outputs, even for prolonged periods, causes no damage. Microphone inputs are not damaged by signals up to 3 V; Line and Monitor inputs by signals up to 20 V Source impedances: Mic 150 Ω, Line 150 Ω.
INTERNAL MODIFICATIONS ABOUT PRINTED CIRCUIT BOARD MODIFICATIONS NOTE: Remove AC power before opening the unit. INSERTING A 15 dB MICROPHONE PREAMPLIFIER PAD Each channel’s microphone preamplifier gain can be reduced by 15 dB. This may be desirable with extremely high-output microphones. • A jumper is represented by “X” on the printed circuit board legend, a resistor is represented by an “R.” • The first number in the reference designator indicates the channel number; i.e.
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. LOCAL AUX OPERATION With linked mixers, the Aux input from a modified mixer does not link. Procedure: 1. Remove resistors R9177 and R9180. 2. Install new resistor R at jumper X907. Procedure: Remove resistor R9024. SEND/RETURN (INSERT) TO DIRECT OUT Procedure: 1.
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