Model SCM410/SCM410E User Guide
Contents
1. 12 On Remove 110k 16 On 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 English 16 Procedure Remove resistor R9203 Install new resistor at jumper R9173 Procedure Remove resistor R9187 Procedure Short jumper X1005 Remove resistor R1087 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 whi2. 14 dBV Outputs Impedance Output Designed for Actual Output Clipping use with typical Level Line 25k Q 300 Q 24 dBV Mic 2600 Q 30 18 dBV Aux 210k Q 1 5KQ 14 dBV Total Harmonic Distortion lt 0 1 at 4 dBu output level 50 Hz to 20 kHz through 22 Hz to 22 kHz filter Input at 12 o clock and Master at 12 o clock all other controls full counterclockwise Hum and Noise 150 source through 22 Hz to 22 kHz filter Equivalent Input Hum and Noise 123 dBV max 125 dBV typical Output Hum and Noise channel controls full counterclock wise Master full counterclockwise 90 dBV Master full clockwise 70 dBV Common Mode Rejection gt 70 dB at 1 kHz Polarity All inputs to all outputs are non inverting Input Channel Activation Attack Time 4 ms Hold Time 0 4 s Decay Time 0 5 s Off Attenuation 13 dB Overload and Shorting Protection Shorting outputs even for prolonged periods causes no damage Microphone inputs are not damaged by signals up to 10 dBV 3V Equalization Low frequency 6 dB octave cut adjustable corner from 25 to 320 Hz High frequency 6 dB at 5 kHz 8 dB at 10 kHz shelving Limiter Type Peak Threshold 16 dBu at output Attack Time 2 ms Recovery Time 300 ms Indicator Lights red when limiting occurs Input LEDs Green on channel activation red at 6 dB below clipping Phantom Power 12 Vdc open circuit through 680 Q resistors Operati
3. The limiter may be turned on via the rear panel DIP switch The default limiter threshold is 16 dBu As supplied the limiter is defeated NOTE Limiter thresholds can be changed from their factory settings Refer to the INTERNAL MODIFICATIONS section HIGH FREQUENCY SHELVING The fixed frequency equalizer produces a 6 dB boost or cut at 5 kHz and above see Figure 17 High frequency shelving is extremely useful for boosting flat frequency response and tempering sibilant vocal micro phones or enhancing the sound of off axis lavalier microphones 10 FULL 8 CW 6 TH z w 2 Q 50 PRN ROTATE 2 Q xq 4 6 8 FULL re Ccw 200 1 000 10 000 20 000 FREQUENCY Hz HIGH FREQUENCY SHELVING EFFECTS FIGURE 17 English 8 SPECIFICATIONS Measurement Conditions unless otherwise specified Line voltage 120 Vac 60 Hz SCM410 or 230 Vac 50 Hz SCM410E full gain 1 kHz one channel activated source impedances Mic 150 Q terminations Line Mic Aux 10 kQ Frequency Response at 1 kHz channel controls centered 50 Hz to 20 kHz 2 dB 3 dB corner at 25 Hz Voltage Gain typical controls full clockwise Output Input Line Mic Aux Low impedance mic 150 Q 80 dB 40 dB 68 dB Inputs Impedance Input Designed for Actual Input Clipping Level use with typical Mic 19 600 Q 1 4 KQ
4. Decreased Erratic LED and or Signal Signal to Noise Channel Distortion Ratio Operation High RF Field X X X generated by nearby radio transmitter Electrostatic X X Discharge Magnetic Fields close proximity to mains power lines or CRTs x lt gt x lt Mains Power Line X X Interruptions Dips poor power grid qualtiy storms Mains Surges and X X Line Transients nearby lightning strikes mains arcs English 9 Replacement Parts Knob Master White ccccccsceceessseeeesseeeeeeees 95A8238 Knob Channel Gain blue cccccceeeeeeeeeeeee 95B8238 Line Power Cord SCM410 ccccccccccsssseeeeees 95A8762 Line Power Cord SCM410E 95A8778 Link Cable ina een enea aN teenie 95A8889 Fuse SCM410 5 x 20 mm T 125mA L 250V time delay 800730 Fuse SCM410E 5 x 20 mm T 50mA L 250V time lag 800380 Long Rack Mount Bracket ccccececeeeeeeeeeee 53A8484 Short Rack Mount Bracket 53B8484 Straddle Bracket cccecesssseeeeseeeeeeseeeeeessneeees 53A8443 Bagged Hardware Kit 90AF8100 English 10 Optional Accessories Line Power Cord 230 240 Vac UK 0006 95A8713 External 50 dB Line Pad ceee A15LA Service Statement For additional service or parts information contact the Shure Service Department at 1 800 516 2525 Outside the U S A contact your authorized Shure Servi
5. Limiter 12V Lock On Level Phantom Power Switch 1 2 3 4 Number Switch Up All mics off after Mic Level ON ON hold time Switch ON Line Level OFF OFF Down Factory setting English AUX OUT Phono Connector Feeds consumer level audio equipment such as a tape recorder VCR or video camera Not affected by MIC LINE switch MIC LINE XLR OUTPUT Connector Can be set for micro phone or line level output via a DIP switch 5 Q LINK IN OUT Connector Permits multiple SCM410 E FP410 SCM810 SCM800 or AMS8100 mixers to be linked creating additional inputs Q MIC LEVEL XLR INPUT Connectors Active balanced microphone level XLR inputs For instructions on how to modify the level of these inputs refer to the Internal Modifi cations section Last Mic Lock On Keeps the most recently activated microphone turned on until another microphone is activated When defeated micro phones turn off after their default hold time XLR Output Level Sets the level of the XLR output to line or micro phone level Make sure the output level matches the input level of the de vice connected to the SCM410 NOTE The output level does not affect the auxiliary output AUX OUT level Limiter Activates the output limiter and sets it to a default threshold of 16 dBu see Internal Modifications for other threshold settings 12V Phantom Power When this switch is in the ON position the SCM410 provides 12Vdc phantom power
6. PRYE went cete ly me OU women eta TE 5 TABLE TOP MOUNTING ier care ace ee ae ae baa doe ence ge abe Gece ea aa deus T a Ea Gg saa deuge pha n D dow oe 6 FIXED MOUNTING o hetae abcde ae ovace es 4 wba a E Banal alte cess owed aee draws n Gah bake eA OA dates aa Bless iaa 6 SCM410 CONNECTIONS cio i oie oa een aaa a otic be el tee bs a dee alee wend a etd a beep ade wie r ao Wo apal es cea beg e wl sare ceep leu 7 LINKING MULTIPLE MIXERS 2 0 0 0 0 cc en eee eee ee eee eee ees 7 BASIC MIXER OPERATION o iaar aaa a eh Chae cb ee aw raed a a a A aa a ala a e a a eine gab arabe pe eee pee asta Bee 8 EIMITE R c naa aa te eaea Nooo EEA E E babe hes a aa E e ah An a E te ON a Er A oe A 8 EQUALIZER FUNCTIONS i aaa a Be add aa a T a a T athe Medea a a A a oe poh Oe aed aT S 8 SPECIFICATIONS iaa nni a E A eas se ea a E le a E enc ad oa ae eat E A E a A EA a 9 ADVANCED FUNCTIONS 5 25 cfc 25s Gee amaaa ag aa ee da a a aA ace a a AN Sok eee bo a A hoe wale aa a eats aAA 11 LOGIC CONNECTION SPECIFICATIONS i et 000 e Tani ee Aa A E A a e E eens 11 SUGGESTED LOGIC APPLICATIONS o eioun iaoea aa a a e i a e aa ati aae dat bata aa A aa a ae ar aaia aa acts 12 INTERNAL MODIFICATIONS iaa a ea naaa a a A a car a aa a aa aa a tad aa ard aa aE a AA aae aa 15 This symbol indicates that there are important operating and This symbol indicates that dangerous voltage constituting a risk FAN maintenance instructions in the literature accompanying this unit AN of elec
7. R10 E1Y2 V185 Newark number 45F 106 or equivalent NOTE A diode across each relay coil is required to suppress inductive voltage spikes which may damage the SCM410 An existing sound system using 24 volt relays can be used with the SCM410 without modification if the relay coil current draw is under 500 mA e L D 1N4148 D e f D 4 2 4 2 EE bd f 12 V POW ER SUPPLY O O y N 5 LOGIC K es GROUND G1 G3 12 3 4 X 6 7 89 10 11 12 13 14 15 oN JN LOUDSPEAKER MUTING FIGURE 25 FILIBUSTER MODE Normally when several people talk each microphone gates on so that no speech is missed In filibuster mode a microphone remains gated on until the talker pauses long enough for that microphone to gate off No other microphone can gate on until that microphone gates off This pre vents talkers from being interrupted To establish filibuster mode refer to Figure 26 and proceed as follows 1 Perform the Mute to Inhibit modification as presented in the Internal Modifications section Connect all the MUTE IN pins together on the modified channels Connect all the GATE OUT pins together on the modified channels Connect the GATE OUT pin of one modified channel to the MUTE IN pin of another modified channel 5 Turn the Last Mic Lock On switch to OFF NOTE To prevent high frequency oscillation do not wire a GATE OUT pin to a MUTE IN pin on the same channel unless the Mute to Inhibit modifi
8. with LED indicator Peak responding output level meter channel even if multiple microphones hear that talker s Last Mic Lock On Keeps the most recently activated micro phone open until another microphone is activated Without Last Mic Lock On a long pause in conversation would cause all microphones to turn off which would sound as if the audio signal had been lost Last Mic Lock On ensures that back ground ambience is always present U S Patents 4 658 425 and 5 297 210 IntelliMix is a registered trademark of Shure Incorporated SHURE SCM410 J PWR 7 0 10 10 lt 1 2 3 OQOOOOOO O eee eud MASTER lt 00 4 5 O Q MODEL SCM410 FRONT PANEL FIGURE 1 Microphone Channel Gain Controls 1 4 Allows adjust ment of microphone gain Input LED 1 4 Lights green when channel is active lights red at 6 dB below clipping level Low Cut Filter 1 4 Provides adjustable low frequency rolloff high pass reducing presence of undesirable low frequency signals High Frequency Shelving Filter 1 4 Provides level boost or cut in mid high frequency region for reduced sibi o 000 lance from vocal microphones or to compensate for off axis coloration in lavalier microphones 5 Output Level Meter Six segment LED meter indicates peak output signal level in dBu 0 dBu 0 775V The red LED illuminates when the output is 6 dB
9. SCM410 is now ready for use NOTE The sensitivity of the ntellimix circuitry may allow some channel gating due to static discharge or electrical disturbance to the power or signal lines The unit will not be damaged normal operation will resume after the disturbance ceases LIMITER Output limiters prevent distortion during loud program peaks without affecting normal program levels This keeps the devices connected to the SCM410 output from becoming overloaded Increasing individual or Mas ter controls on the SCM410 increases average output and in turn the amount of limiting EQUALIZER FUNCTIONS LOW CUT FILTER HIGH PASS Low cut filters are used to reduce unwanted low frequency sounds such as footsteps motorized traffic and to control proximity effect The SCM410 has a one pole low cut high pass filter of 6 dB per octave The low cut filter allows all frequencies above its cutoff point to pass through unchanged Frequencies below the cutoff are attenuated see Figure 16 The cutoff point is defined as the frequency where the signal has dropped 3 dB relative to the flat or bandpass region Below the cutoff point the filter exhibits increasingly more attenuation as the frequency diminishes 2 o FULL CW 2 6 Xg 4 50 FULL CCW ROTATION 20 100 1 000 5 000 FREQUENCY Hz AMPLITUDE dB LOW CUT FILTER EFFECTS FIGURE 16
10. SHURE Model SCM410 SCM410E tame User Guide SHURE 801 410 InreruMix OUTPUT LEVEL METER No i ASTE b t d 8 eet J w SCM410 SCM410E FOUR CHANNEL AUTOMATIC MICROPHONE MIXER 27D8690 CD 2003 Shure Incorporated Printed in U S A TABLE OF CONTENTS DESGRIP TION eso oe cere Pesce a Bas eaten dap ahd waded ara a a ake se ape ws E ea Woe Sa galtatie ite Seabee vasa ata A TTE EA Soate rete es 3 FEATURE Sted 2k poster Aad tected aie chee a anette ato a buted chu Restate Td Ate ois Ne ok oe ak eat eee E i E ae Ax 3 OPERATING PRINGIPLES csc cccchedsne e besarte yobs e toe a aaa eunce a r patency oven mah a e 3 PRON TERAN Ele eh 87 Sercrec ae haan cect nane hh sar ean be ent meet a pata ence casndac doh Se mer cs dace nrat a gh bey Sasa a E res Penh A a E rade ae 3 REAR PANE Lice a ole ieee aaa ieee Nin abated saan ooh ie av oo ae Oe vg ah aes baw ee ne Win eg edad Me ete Phage cd ee ae Meee AN ne Geet 3 4 DIP SWITCH ARUNGTIONS erin el we Pe orale 2 los A sates cal natn os et ato Bas de od hea he lt tee Dats pala al tan sland 4 INSTALLATION oeiia a a Chana ata aie a tad ae a a facta ata tahe cane aaia dure Gea la ara cacahaca AA aa a cofeuaceuacaheccarecacs EAE A aracecdla anata 5 SUPPEHED HARDWARE ieee set ne Stele ie te Pie ose a Seek ag ele bony Peer boa va hls assleny eter A Sd Saeety let aaah abun Setar be seep a suger bce ae 5 RACKMOUNTING een eine a fa a watt A ay eee te cede BU a tognds Snueheye Te wad E ols acl mol
11. URFACE FIGURE 11 English 6 A HANGING MOUNT Fasten the straddle brackets to the top of the mixer as shown in Figure 12 INSTALLING STRADDLE BRACKETS FOR HANG MOUNTING FIGURE 12 Fasten the straddle brackets to the bottom of the mounting sur face using the four 4 supplied wood screws See Figure 13 iA AS i 1 1 1 1 1 i 1 i N X q 1 1 1 1 1 a 1 1 BN tf SECURING MIXER TO BOTTOM MOUNTING SURFACE FIGURE 13 SCM410 CONNECTIONS 1 Connect microphone signal sources to the Channel Input connec tors as shown in Figure 14 Use conventional 2 conductor shielded audio cables 2 If any condenser microphones are connected set the 12V phantom power DIP switch to ON Connect the SCM410 Mic Line Level Output to the input of mixers EQs amplifiers or recorders Connect the power cord to 100 120 Vac SCM410 or 220 240 Vac SCM410E LINKING MULTIPLE MIXERS If more than four inputs are needed multiple Shure SCM410 FP410 or SCM810 mixers can be linked by connecting the LINK OUT of the first mixer to the LINK IN of the next mixer and so on See Figure 15 Leave the LINK IN jack of the first mixer and the LINK OUT jack of the last mixer unconnected When properly linked the mixers will operate as a system Automatic mixing functions will be sha
12. below clipping The last LED indicates limiter action O MASTER Level Control Controls overall output level Q POWER LED Lights green when mixer is plugged into a power source English 3 REAR PANEL LOGIC MIC LINE OUT 0000 00000 JO 0o00 OUT AUXI OUT LINK SHURE ee anal O C MC ON usm N T oF PHANT ON IMER CFF QUTLEV LINE POWER 1 2 ooo o Q REAR PANEL FIGURE 2 MODEL SCM410 1 Power Connector Unit is energized when the power cord is plugged into a 100 120 Vac SCM410 or 220 240 Vac SCM410E power source Can be internally modified Refer to the Internal Modification section NOTE There is no power On Off switch on this mixer DIP Switch The 4 position DIP switch provides additional functions Refer to the DIP Switch Functions section 27 Microphone Logic Connector High density DB 15 male connector provides connection to GATE OUT MUTE IN and OVERRIDE IN logic terminals on each channel Refer to the Advanced Functions section NOTE THIS IS NOT A VGA MONITOR PORT DIP SWITCH FUNCTIONS The rear panel DIP switches shown in Figure 3 provide the functions listed in the table below 1234 DIP SWITCHES FIGURE 3 Last Mic XLR Output
13. cation has been made RON e LOGIC G1 G2 G3 GROUND 1 2 3 4 5X 6 7 89 10 11 12 13 14 15 FILIBUSTER MODE FIGURE 26 English 13 INHIBIT FUNCTION For information on the inhibit function refer to the Internal Modifica tions section REMOTE VOLUME CONTROL The level of the Aux or Master output can be controlled from an exter nal VCA Voltage Controlled Amplifier such as the RU VCA1 from Radio Design Labs Tel 1 800 281 2683 or www rdinet com To connect a VCA to the SCM410 proceed as follows 1 Connect the SCM410 Line output to the VCA line input 2 Connect the VCA line output to the external device 3 For remote Master level control set the SCM410 Master control to 5 DIODE ISOLATION OF LOGIC CONTROLS Two or more control functions that use the same logic pins can be iso lated with diodes as shown in Figure 27 With this modification a chan nel can be muted by an overall group mute switch or by its own cough button us D 1N4148 OR GROUP EQUIVALENT MUTE D LOGIC is GROUND 12 3 45 M1 41 12 1314 15 7 DIODE ISOLATION OF LOGIC TERMINALS FIGURE 27 COUGH BUTTONS DIGITAL CONTROLS OR MICROCOMPUTERS The SCM410 logic pins can interface with custom designed digital control circuitry or microcomputers for unlimited possibilities of system control functions EXTERNAL LOGIC DEVICES SCM410 logic levels are directly compatible with TTL and 5V CMOS logic families Mixer lo
14. ce Center ADVANCED FUNCTIONS CAUTION Use of Advanced Functions is recommended only for qualified audio technicians LOGIC CONNECTION SPECIFICATIONS The SCM410 logic functions expand the range of installation and con trol options Logic can be used for everything from simple cough switches to elaborate computer controlled room systems Shure s AMS Update publication contains additional applications of advanced logic This publi cation is available by contacting the Shure Applications Department The following logic functions are available for each channel GATE OUT Follows channel gating and goes to logic low sinks cur rent when microphone is gated on 500 mA of current sinking ability is provided see Figure 18A MUTE IN Applying logic low from GATE OUT or a switch closure to logic ground gates channel off see Figure 18B Channel output drops to 0o A BvD B C 5V gt k L 10K 55K MUTE IN l lt 8 e gt ang OR OVER o e scm410 RIDEJN CIRCUIT FROM scm410 gt CIRCUIT LOGIC GROUND LOGIC EQUIVALENT CIRCUIT DIAGRAM FIGURE 18 OVERRIDE IN Applying logic low from GATE OUT or a switch clo sure to logic ground forces channel on see Figure 18B When both Mute and Override are activated Mute takes precedence see Internal Modifications for Override precedence LOGIC GROUND Logic ground is distinct from audio ground Make all logic ground connections to this pin includi
15. ch a microphone picks up a 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 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 CHANGING OVERRIDE IN TO MUTE IN FILIBUSTER MODE This modification should only be performed with the Change MUTE IN to Inhibit modification described above This is only necessary if the Mute function is desired along with Filibuster Mode CHANGING THE OFF ATTENUATION LEVEL This procedure changes the off attenuation level from 13 dB as supplied Refer to the following table for attenuation levels and resis tor values Off Attenuation Level Resistor Value 10 dB 18 KQ 13 dB 30 kQ default 20 dB 75 kQ 30 dB 250 kQ dB open circuit NOTE As more Input channels are added to the system the off attenuation increases slightly GROUP GATING With this modification several channels can be grouped together so that all of them activate whenever one of them activates This is useful for miking choirs SHORTING OVERRIDE IN TO LOGIC GROUND INTERNALLY This mo
16. ded pair may result in audible clicking due to capacitive coupling between the dc power lines and microphone lines o 470 gt 1 4 W gt LOGIC ry ry GROUND G1 G3 f 12 3 45 67 8 9 10 1 12 13 14 15 G2 470 h 14w ANAN REMOTE CHANNEL ON INDICATORS FIGURE 22 DISABLING THE GATING FUNCTION BYPASS To keep certain microphones on at all times wire the desired micro phone channel s OVERRIDE IN pins together to the Logic Ground pin The selected channels now function as they would in a non automatic mixer see Figure 23 To perform this modification internally on the mixer refer to the Shorting Override In to Logic Ground Internally paragraph in the Internal Modifications section LOGIC otlozlos SRPUND ft l2 3 4 5 6 7 8 9 10 11 12 13 14 15 GATING BYPASS FIGURE 23 English 12 INHIBITING GATING FOR UNWANTED SOUNDS MaxBus attempts to activate only one microphone per sound source Muting a microphone channel prevents its audio from appearing at the mixer s output However the muted microphone still communicates with other mic channels via MaxBus A sound source picked up by a muted mi crophone will not activate other microphones Sound sources that may cause unwanted microphone channel activa tion include Heating ventilation or air conditioning systems e A noisy fax machine or printer e A squeaky door e A paging system loudspeaker An audio teleconferencing return signal lo
17. dification is equivalent to shorting one of the channel OVER RIDE IN to the LOGIC GROUND pin via the high density DB 15 logic con nector With this modification a channel is always on SHORTING MUTE IN TO LOGIC GROUND INTERNALLY This modification is equivalent to shorting a channel MUTE IN to the LOGIC GROUND pin via the high density DB 15 logic connector With this modification a channel is always muted talker through a muted microphone and other microphones do not acti vate for that talker Procedure 1 Short jumper X1002 Procedure 1 Short jumper X1007 Procedure 1 Short jumper X1006 2 Remove resistors R1087 and R1082 Procedure 1 Remove resistor R9178 2 Install new resistor at jumper points R9177 Procedure 1 Locate pad PD1000 2 Solder a wire from PD1000 to the other channels in the group For example to gate channels 1 3 as a group solder a wire con necting PD1000 PD2000 and PD3000 Procedure 1 Short jumper X1003 Procedure 1 Short jumper X1004 English 17 DISABLING AUTOMATIC MIXING FUNCTION BY CHANNEL This modification removes a given channel from the ntelliMix automat Procedure ic mixing circuitry so that a source such as music can be played through 1 If necessary modify the channel input to accept line level sig a channel of the SCM410 without affecting the automatic mixing of the un nals Refer to the Inserting an Input Line Pad paragraph modinee channels 2 Modif
18. f Open Microphones Attenuated Last Mic Lock On circuit maintains ambient sound Fits in half rack space e Adjustable EQ for each channel OPERATING PRINCIPLES The operating concept behind the SCM410 Automatic Mixer is Shure s patented IntelliMix circuitry Intellimix delivers seamless auto matic mixing by combining three separate functions Noise Adaptive Threshold Distinguishes between constant background noise such as air conditioning and changing sound such as speech for each input channel It continuously adjusts the activation threshold so that only speech levels louder than the background noise activate a channel MaxBus Controls the number of channels that may be acti vated for a single sound source One talker activates only one FRONT PANEL Each input channel has a two band equalizer and three logic termi nals The equalizer reduces unwanted low frequency audio pickup and makes different microphone types lavaliers boundary and handheld sound similar The logic terminals can be used to control external devices The SCM410 operates on 100 120 Vac power and the SCM410E op erates on 220 240 Vac power Each mixer is supplied with a power cord rack mounting hardware and a link cable e Active balanced microphone level XLR inputs and an active balanced Mic Line level XLR output Unbalanced auxiliary level phono output Bi color channel activation and clipping LEDs Peak responding output limiter
19. gic may be used with 15V CMOS logic if a pull up resistor is used with each GATE output See Figure 28 NOTE For information on logic gate use refer to the TTL Cookbook and CMOS Cookbook both by D Lancaster Howard Sams Publishing Co V a A N a lt V NA gt A CMOS N GATES 7 G1 01 LOGIC GROUND 12 34 S le 7z 8 9 10 1112 13 14 15 M1 15V CMOS FIGURE 28 English 14 INTERNAL MODIFICATIONS service personnel WARNING Voltages in this equipment are hazardous to life No user serviceable parts inside Refer all servicing to qualified e Only make changes to jumpers X and resistors R The cir cuit board contains holes where resistors are to be added For Channel modifications the first character of the reference designator indicates the channel number i e R1027 refers to a Channel 1 resistor X2001 refers to a Channel 2 jumper DISASSEMBLING THE SCM410 SCM410E To access the printed circuit board for internal modifications proceed 3 as follows 4 1 Remove the power cord from the ac power source 5 2 Remove the knobs retainer nuts and washers from the front panel as shown in Figure 29 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 mod 3 ify if for use with 220 240 Vac 50 60 Hz power proceed as f
20. ng Voltage SCM410 100 120 Vac rated nominal 50 60 Hz 100 mA maximum SCM410E 220 240 Vac rated niminal 50 60 Hz 50 mA maximum Mains Inrush Current 230 Vac SCM410E only 0 7 A peak Temperature Range Operating 7 to 49 C 20 to 120 F Storage 29 to 74 C 20 to 165 F Overall Dimensions 44mmHx 219mm Wx 267 mmD 1 3 4 x 8 5 g x 10 1 3 in Net Weight 1 75 kg 3 86 Ibs Certifications SCM410 UL listed to UL 6500 and cUL listed to E65 Canada SCM410E Conforms to applicable European Directives el igible to bear CE marking Low Voltage Directive 73 23 EEC VDE GS Certified to EN 60065 EMC Directive 89 336 EEC Professional Audio Products Standard EN55103 1996 Part 1 Emissions and Part 2 Immunity Electromagnetic Compatibility EMC Statement The SCM410E mixer is intended for use in E1 residential and E2 light industrial environments as defined in Europe an EMC standard EN 55103 It meets the applicable tests and performance criteria found in the standard for these en vironments EMC conformance is based on the use of rec ommended and supplied cables NOTE Under certain circumstances the SCM410E may be exposed to outside electromagnetic interference levels beyond what is typical in the intended environment Should this occur additional measures may be required to reduce interference to acceptable levels The following table identifies possible sources of unwanted interference
21. ng power supply ground of ex ternal logic circuitry To avoid switching clicks do not connect logic ground to audio chassis or rack grounds Logic controls are accessed through the high density DB 15 multi pin connector on the rear panel Figure 19 Pin connections are shown in the following table 6 7 8 91 10 11 12 13 14 15 LOGIC CONNECTOR FIGURE 19 LOGIC CONNECTIONS Pin Logic Function Logic Function Pin No No 1 OVERRIDE IN 1 GATE OUT 1 6 2 OVERRIDE IN 2 GATE OUT 2 7 3 OVERRIDE IN 3 GATE OUT 3 8 4 GATE OUT 4 GATE OUT 4 4 5 LOGIC GROUND OVERRIDE IN 1 1 6 GATE OUT 1 OVERRIDE IN 2 2 7 GATE OUT 2 OVERRIDE IN 3 3 8 GATE OUT 3 OVERRIDE IN 4 14 9 NO CONNECTION MUTE IN 1 11 10 MUTE IN 4 MUTE IN 2 12 11 MUTE IN 1 MUTE IN 3 13 12 MUTE IN 2 MUTE IN 4 10 13 MUTE IN 3 LOGIC GROUND 5 14 OVERRIDE IN 4 NO CONNECTION 15 15 NO CONNECTION NO CONNECTION 9 English 11 SUGGESTED LOGIC APPLICATIONS This section contains suggestions on the uses of the SCM410 s logic capabilities Note that uses of these functions are not limited to the listed applications The user is limited only by imagination and creativity For ad ditional suggestions and solutions to installation problems contact the Shure Applications Department COUGH BUTTON The talker can turn off his or her microphone during coughing or private conversations by installing an SPST pushbutton swi
22. o the apparatus the apparatus A polarized plug has two blades with one wider than the other A grounding 5 3 type plug has two blades and a third grounding prong The wider blade or nas sae exposed to rain or moisture does not operate normally or has been ropped the third prong are provided for your safety If the provided plug does not fit into your outlet consult an electrician for replacement of the obsolete outlet 15 DO NOT expose the apparatus to dripping and splashing DO NOT put objects 10 PROTECT the power cord from being walked on or pinched particularly at plugs filled with liquids such as vases on the apparatus convenience receptacles and the point where they exit from the apparatus NOORON gt English 2 DESCRIPTION The Shure Model SCM410 E is a four channel automatic microphone mixer designed for use in sound reinforcement audio recording and broadcast applications The SCM410 dramatically improves audio quality in any application where multiple microphones are required Any low im pedance dynamic or condenser microphone including wireless can be used with the SCM410 Multiple SCM410 mixers can be linked to other SCM410 mixers as well as to Shure Models FP410 SCM810 SCM800 and AMS8100 mixers FEATURES Fast noise free microphone selection which automatically adjusts to changes in background noise e Automatic gain adjustment as additional microphones are ac tivated NOMA Number o
23. ollows 4 1 Disassemble the SCM410 according to the procedures in the Disassembling the SCM410 SCM410E paragraph 5 2 Locate Voltage Selector switch SW9001 adjacent to power trans former T9000 MODIFYING THE SCM410E FOR 100 120 VAC 50 60 HZ OPERATION As supplied the SCM410E uses 220 240 Vac 50 60 Hz power To 3 modify it for use with 100 120 Vac 50 60 Hz power proceed as follows 1 Disassemble the SCM410E according to the procedures in the Disassembling the SCM410 SCM410E paragraph 5 2 Locate Voltage Selector switch SW9001 adjacent to power trans former T9000 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 4 DISABLING PHANTOM POWER BY CHANNEL To disable phantom power for a given microphone input channel re English 15 etc Modifications affecting the Master section are preceded by a 9 i e X9001 All Channel modifications in this section use Channel 1 as an example Remove the four screws at each corner of the rear panel Remove the two screws at each bottom corner of the front panel 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 internal components will result if too much force is used Using a screwdriver turn the center rotor to the 230 positi
24. on Locate Fuse F9000 and replace it with a T 50 mA L 250 V time lag fuse for 220 240 Vac operation Replace the power cord with a cord rated for 220 240Vac operation Using a screwdriver turn the center rotor to the 115 position Locate Fuse F9000 and replace it with a T 125 mA L 250 Vac time delay fuse for 100 120 Vac operation Replace the power cord with a cord rated for 100 120 Vac oper ation Procedure Short jumper X1000 Remove resistor R1006 move the resistor specified in the following table Channel Remove Resistor 1 R1005 2 R2005 3 R3005 4 R4005 INSERTING AN INPUT LINE PAD To insert a 40 dB line pad for a given microphone input remove the resistors specified in the following table Channel Remove Resistor 1 R1005 R1006 2 R2005 R2006 3 R3005 R3006 4 R4005 R4006 DISABLING THE MASTER LEVEL CONTROL The Master gain control can be disabled to prevent tampering Refer to the following table for gain levels and resistor values Master Section Gain Resistance 6 dB 5 1 KQ 0 10 KQ 6 dB 20 KQ CHANGING THE LIMITER THRESHOLD To change the limiter threshold from the preset value of 16 dBu mod ify the circuitry according to the following table CHANGE LIMITER THRESHOLD Limiter Threshold Limiter X9003 R9149 R9142 dBu DIP switch 0 On Remove 20k 4 On Short 8 Off Short
25. red by all units All input signals appear at all linked mixer outputs Each mixer s Master level control only controls its own output However actual off attenuation will increase as more mixers are linked This reduces excessive noise and reverberation contributed by the increased number of microphones IMPORTANT When using logic terminals on linked mixers connect the LOGIC GROUND terminals of each unit together NOTE SCM410 link connections are unbalanced To minimize hum and noise avoid using longer link cables Use high quality shielded cable and keep them away from sources of magnetic or electrical noise such as power transformers or light dimmers To minimize SCM410 CONNECTIONS FIGURE 14 ground currents make sure linked mixers are connected to the same AC power mains LINKED SCM410 AND SCM810 MIXERS FIGURE 15 English 7 BASIC MIXER OPERATION 1 Adjust each channel level so that its Overload LED flickers only during very loud speech or noise 2 Adjust the Low Cut and High Frequency controls adjacent to each Input Gain control so that the microphones sound similar 3 Adjust the Master level control for the required output level as indicated by the output peak meter The
26. tch between the MUTE IN and Logic Ground pins for each channel to be modified see Fig ure 20 When a channel is muted no audio is passed See Dead Zone on MUTE IN Defeat paragraph in the nternal Modifications section for more information on MUTE IN logic LOGIC GROUND BR 9 10 1314 15 COUGH BUTTONS FIGURE 20 CHAIRPERSON CONTROLLED MUTING The chairperson can by activating a switch silence all other micro phones and be heard without interruption For operation in this mode connect all the MUTE IN pins together except that of the chairperson s channel and wire an SPST pushbutton or toggle switch between those MUTE IN and Logic Ground pins see Figure 21 An alternative to a switch is to connect the chairperson s GATE OUT to the MUTE IN of other channels When the chairperson s microphone activates all other microphones mute LOGIC GROUND 12 3 4 5 ij 6 7 8 9 10 11 12 13 14 15 M2 3 e CHAIRPERSON CONTROLLED MUTING FIGURE 21 REMOTE CHANNEL ON INDICATORS Remote indicators can be used to indicate when a talker s microphone is on Connect the LEDs and a 5 volt supply to the GATE OUT pins See Figure 22 To avoid switching clicks in the audio output do not ground the power supply negative terminal in the audio system or rack ground IMPORTANT If a single cable is used for the microphone audio signal and the LED dc power separate shielded pairs must be used Failure to carry the dc power on a shiel
27. to each XLR microphone input This function is particularly useful when using condenser microphones since most condenser microphones require phantom power NOTE Phantom power does not affect the operation of balanced dynamic microphones They can be connected to the SCM410 in combination with condenser microphones that use phantom power For instructions on how to disable phantom power by channel refer to the Internal Modifications section 4 INSTALLATION SUPPLIED HARDWARE 4 rubber feet 1 rackmount bracket long 1 rackmount bracket short 2 straddle brackets RACK MOUNTING The SCM410 is supplied with hardware for mounting one or two units to a 19 inch audio equipment rack The hardware can also be used to rack mount other Shure products including the SCM268 SCM262 DFR11EQ and the DP11EQ SINGLE MIXER HALF RACK INSTALLATION 1 Attach the short and long rackmount brackets to the SCM410 E with eight 8 of the supplied bracket screws as shown in Figure 4 INSTALLING HALF RACK MOUNTING BRACKETS FIGURE 4 2 Place the mixer in an equipment rack and secure it with the sup plied rackmount screws and plastic washers See Figure 5 RACK MOUNTING A SINGLE SCM410 E MIXER FIGURE 5 10 bracket screws 6 mm 1 4 in 4 rackmount screws 2 54 cm 1 in 4 plastic washers 4wood screws 1 25 cm 1 2 in DUAL MIXER FULL RACK INSTALLATION 1 Place the t
28. tric shock is present within this unit WARNING Voltages in this equipment are hazardous to life No user serviceable parts inside Refer all servicing to qualified service personnel The safety certifications do not apply when the operating voltage is changed from the factory setting IMPORTANT SAFETY INSTRUCTIONS READ these instructions 11 ONLY USE attachments accessories specified by the manufacturer KEEP these instructions 12 USE only with a cart stand tripod bracket or table HEED all warnings specified by the manufacturer or sold with the FOLLOW all instructions apparatus When a cart is used use caution when DO NOT use this apparatus near water moving the cart apparatus combination to avoid CLEAN ONLY with dry cloth injury from tip over DO NOT block any ventilation openings Install in accordance with the manu a 5 ane r f facturer s instructions 13 UNPLUG this apparatus during lightning storms or when unused for long periods of 8 DO NOT install near any heat sources such as radiators heat registers stoves time es a aed or other apparatus including amplifiers that produce heat 14 REFER all servicing to qualified service personnel Servicing is required when the 9 DO NOT defeat the safety purpose of the polarized or grounding type plug apparatus has been damaged in any way such as power supply cord or plug is dam aged liquid has been spilled or objects have fallen int
29. udspeaker The SCM410 can prevent these and similar sounds from activating mi crophones as follows 1 Place one microphone near the unwanted sound source Con nect that microphone s signal to a channel input or connect the unwanted sound source directly into a channel input 2 Mute that channel using the logic terminal see Figure 24 To perform this modification internally on the mixer refer to the Shorting Mute In to Logic Ground Internally paragraph in the Internal Modifications section 3 Adjust the channel gain control just past the level where unwanted sounds do not activate other microphones in the system If the channel gain is set too high the other micro phones may not be activated by the desired sounds If set too low unwanted sounds will continue to activate other micro phones LOGIC 1 2 3 4 5 gt GROUND 6 7 8 9 10 1112 13 14 15 M1 INHIBITING GATING FOR UNWANTED SOUNDS FIGURE 24 LOUDSPEAKER MUTING Some applications require a loudspeaker to be placed near each talker to provide audio reinforcement or to permit telephone conversation or conference monitoring Each loudspeaker can cause feedback unless it is automatically switched off when the talker near it speaks To provide this function connect the GATE OUT terminal of each channel to a sep arate loudspeaker muting relay See Figure 25 Recommended relays are Radio Shack 275 248 Omron G2R 14 DC12 Digi Key number Z745 ND Potter amp Brumfield
30. wo mixers side by side and connect them with two 2 straddle brackets The brackets should straddle the recessed edges on the top and bottom of each mixer See Figure 6 INSTALLING STRADDLE BRACKETS FIGURE 6 2 Fasten the straddle brackets using eight 8 bracket screws 3 Attach the short rackmount brackets to the outsides of the com bined mixers with eight 8 of the bracket screws See Figure 7 INSTALLING FULL RACK MOUNTING BRACKETS FIGURE 7 4 Place the mixer in an equipment rack using the supplied rack mount screws and plastic washers See Figure 8 md RACK MOUNTING DUAL SCM410 E MIXERS FIGURE 8 English 5 TABLE TOP MOUNTING Adhere the four 4 supplied rubber feet to the bottom of the mixer at each corner as shown in Figure 9 This will keep it from sliding and pro tect the table surface ATTACHING RUBBER FEET FOR TABLE TOP MOUNTING FIGURE 9 FIXED MOUNTING TOP MOUNT 1 Fasten the straddle brackets to the recessed edges of the chas sis using four 4 bracket screws as shown in Figure 10 Af INSTALLING STRADDLE BRACKETS FOR TOP MOUNTING FIGURE 10 2 Fasten the straddle brackets to the top of the mounting surface using the four 4 supplied wood screws See Figure 11 SECURING MIXER TO TOP MOUNTING S
31. y the channel s Override In to On Refer to the Shorting Override In to Logic Ground Internally paragraph 3 Short jumper X1001 to remove the channel from the MaxBus 4 Remove R1064 to remove the channel from the Last Mic Lock On Bus MANUAL MODE ENABLE This modification defeats the automatic mixing functionality of the Procedure SCM410 so that it operates as a standard 4 x 1 mixer 1 Short jumper X9001 English 18 SHE SHURE Incorporated Web Address http www shure com 5800 W Touhy Avenue Niles IL 60714 4608 U S A Phone 800 257 4873 Fax 847 866 2279 In Europe Phone 49 7131 72140 Fax 49 7131 721414 In Asia Phone 852 2893 4290 Fax 852 2893 4055 Elsewhere Phone 847 866 2200 Fax 847 866 2585
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