Shure M367 User's Manual
Contents
1. DUAL BANANA JACK OUTPUT FIGURE 6 Connect this adapter to the M367 Line output CHANGING MONITOR IN TO AUX IN NOTE This modification disables the M367 s monitor function Remove resistors R642 and R647 near Phones potentiometer R648 Locate empty pads X601 near output transformer T601 and X643 near Monitor In jack J683 Solder a jumper wire from X643 to X601 The Monitor In jack is now an unbalanced tip positive sleeve ground Aux In jack with an input impedance of 11 kQ and a maximum gain to Line Out loaded with 600 2 of 17 dB The Aux In signal is only controlled by the Master control To change Aux In gain locate resistor R605 near X601 Care fully remove R605 and replace it with a surface mount resistor 0805 package of the desired value If replacing R605 with 15 kQ maximum Aux In to Line Out gain equals 14 dB and input impedance equals 16 KQ if replaced with 6 8 kQ maximum Aux In to Line Out gain equals 20 dB and input impedance equals 7 8 kQ CHANGING MONITOR IN HIGH GAIN DIP Switch 701 Position 5 Down Locate resistor R647 near Phones potentiometer R648 and re move it Locate empty pads X647 near R647 Solder a 330 2 1 4 W resistor in the holes of X647 for 6 dB gain boost with DIP switch S701 position 5 down input impedance equals 6 5 kQ in this position CHANGING MONITOR IN JACK FROM MONO INPUT TO STEREO SUM INPUT Locate empty pads X645 near Monitor In jack2. 2 Remove the indicated capacitor for each channel to be modified 3 Calculate new capacitor value for higher high cut corner fre quency Use the following formula C in uF 85 frequency Example for 400 Hz corner frequency C 85 400 0 21 For 400 Hz corner frequency use a 0 22 uF capacitor 4 Solder a new capacitor through the holes of the empty pads for each channel to be modified SLOWING OUTPUT METER FROM True VU BALLISTICS Locate empty pads X691 at left of VU meter M1 Solder a 100 uF x 6 3 V electrolytic capacitor through the holes of X691 Ob serve capacitor polarity as marked on the PC board The response time is now 500 ms with no overshoot To further slow the meter response use a larger capacitor value CHANGING MIC LEVEL OUTPUT IMPEDANCE Locate resistor R631 near output transformer T601 and remove it Locate empty pads X631 near T601 Solder desired value 1 4 W resistor through the holes of X631 For example use a 150 Q 1 4 W resistor for 150 Q output impedance ADAPTING LINE OUT TO DUAL BANANA JACK Add a dual banana jack balanced line level output capability by purchasing a commercial unit Sescom XLR F 3BP or equivalent or obtaining a female XLR connector Radio Shack 274 011 or equivalent a dual banana jack ITT 2269 or equivalent a small utility box and a short length of high quality shielded output cable and constructing the adapter shown in Figure 6
3. Perform all modifications through solder points accessible on the main PC board DISASSEMBLING THE M367 1 Remove the mixer top cover as previously described 2 Carefully remove three multi pin cable assembly connectors from upper front PC board nearest front panel Remove the three Phillips head screws securing the PC board Remove up per front PC board 3 Carefully remove four multi pin cable assembly connectors from upper rear PC board nearest rear panel Remove the three Phillips head screws securing the PC board Remove upper rear PC board 4 Perform modification refer to appropriate following proce dure Note that all modifications can be performed without removing the main PC board 5 Reassemble M367 by performing above steps in reverse assembling the Phillips screws in the order indicated on the upper front and upper rear PC boards CHANGING LINE LEVEL OUTPUT IMPEDANCE TO 600 Q Locate resistor R621 near IC U602 pin 8 on the main PC board and remove it Locate empty pads X621 near resistor R621 Solder a 430 2 1 2 W resistor through the holes at X621 CHANGING UNSWITCHED LINE OUTPUT TO MIC LEVEL Locate resistor R632 near output transformer T601 and remove Locate empty pads X632 near transformer T601 Solder a jumper wire through the holes of X632 CHANGING MIXER AUDIO LEVELS IN HEADPHONES Pull Monitor Switch Activated DIP Switch S701 Position 4 Closed Locate empty pads X649 near Phon
4. A AA 2 9900100 Ol 041 PEAK IL 1 IL O oFFoN ox OFFON BATT EN CHECK IMITER 1kHz ONE MASTER M367 FRONT PANEL CONTROLS AND INDICATORS FIGURE 1 Input Gain Control For best performance adjust each Input Gain Control so the associated Input Peak LED illuminates red only on the loudest signal peaks Input Low Cut Filter Switch Provides low frequency roll off to reduce wind noise and rumble When using the filter the frequency response is down 7 dB at 150 Hz Roll off slope is 6 dB per octave Input Peak LED Illuminates at 6 dB below clipping Limiter Switch Activates a fast acting peak responding limiter optimized for speech An internal modification can provide a slower release time for music signals see DIP Switches Output Peak Limiter Bi Color LED Red output signal at 12 dBm 6 dB below clipping Green output signal at limiter threshold when limiter is on Output Level VU Meter Meter response approximates true VU characteristics about 300 ms rise and fall 1 to 5 over shoot For a slower response see Internal Modifiable Func tions 0 VU is switchable between 4 and 8 dBm see DIP Switches When using batteries use the BATT CHECK switch to illuminate the meter 1 kHz Tone Oscillator Switch Sends a 1 kHz tone to all out puts and mutes all inputs The MASTER control adjusts tone level Battery Check Button Press and hold to show battery level on the VU meter Pres
5. 16 dBm Attack Time 1 ms 0 5 ms Input Designed for Actual Clipping Release Time Constant 100 ms 30 ms neem Internal Level Indicator Green when limiting by 1 dB or more Mic 19 to 600 2 1kQ 10 dBV Phantom Power Ti a a rae 12 V Phantom 12 V through 340 Q lt ng a 48 V Phantom 48 V through 3 4 kQ Monitor lt 1kQ 13 kQ 0 dBV AC Power Mix Bus 930 Q bal 930 Q bal 23 dBV M367 100 120 Vac 50 60 Hz 100 mA M367 1860 Q unbal 1860 Q unbal cee 220 240 Vac 50 60 Hz 50 mA no signal current drain Mix Bus 3 5 kQ 3 5 kQ 17 dBV DC Power M267 18 Vdc nominal at 40 mA typical no signal 45 mA typical at 4 dBm output 13 5 Vdc minimum Outputs Batteries Two 9 V alkaline batteries IMPEDANCE Output Battery Life Up to 8 hours at 4 dBm output in continuous use Output Designed for Actual Clipping see Battery Operation Use With internal bevel Temperature Range Mic Low Z inputs 1Q 31 dBV Operating 18 to 57 C 0 to 135 F Line 600 Q 1506 18 dBm Storage 29 to 74 C 20 to 165 F Overall Dimensions H x W x D Phones 8 to 200 Q 300 2 11 dBV 71 9 mm x 308 mm x 233 mm 2 13 16 in x 12 5 32 in x 9 5 32 in including feet Mix Bus 930 2 bal 930 Q bal 11 dBV Weight without batteries oe 1860 Q unbal 1860 Q unbal 3 kg 6 6 Ib Mix Bus 3 5 kQ 3 5 kQ 28 ABV Measurement conditions unless otherwise specified operating M267 voltage 120 Vac 60 Hz 18 1 Vdc for dc test operating tempera ture 22
6. C 72 F input signal 1 kHz internal DIP switches 1 7 open Power switch on Mic Line switches to Line low cut switches to flat Limiter out Phantom power off Mix Bus to M367 channel 1 gain full CW channel 2 through 6 full CCW Master full CW Phones level full CCW Line output terminations 600 Q pins 2 and 3 Mic output ter minations 150 Q pins 2 and 3 Phones 1 4 ring 300 Q to ground Phones 1 4 tip 300 Q to ground Phones 3 5 mm unloaded Mix Bus 930 Q M367 position or 3 5 kQ M267 position not connected unless specified 1 kHz input signal REPLACEMENT PARTS Foot Kit 4 in Kit 212 daan itna aa 90S8100 M367 Fuse 0 125 A 250 V ooooWoWo W Wo maan 80E380 M367E Fuse 0 063 A 250 V oooooo W oo 80G380 Knob MASSA amankan 95 8238 Channel Gain Phones ooooooo 95B8238 Line Power Cord eh Naa PRA RP PPA AE TA 9518389 NT TA DAR AAA AN AOI PA NU MAA Ae AE 95B8389 OPTIONAL ACCESSORIES Rack Mount Kits iecrccrssceesccbivecsestcecicostasdaossameracncesesSaeton A367R STATEMENT OF CONFORMITY Conforms to European Union directives eligible to bear CE marking VDE GS Certified to EN60065 meets European Union EMC Immunity Requirements EN 50 082 1 1992 RF radiated IEC 801 3 meets Criterion A ESD meets Criterion B EFT IEC 801 4 meets Criterion B GENERAL INFORMATION Changes or modifications not expressly approved by Shure Inc could void your authority to operate th
7. chan nel input See Pull Monitor switch description You can also modify the MONITOR IN jack to accept a stereo input and provide a stereo sum monitor signal see Internal Modificable Functions Mixer Output These male XLR outputs are transformer balanced The Line output is preset to line level but can be modified to a true 60022 output impedance or changed to microphone level see Inter nal Modifiable Functions Power Connector See AC Operation Time Delay Fuses The slide out compartment contains two power line fuses The outer toward you is a spare M367 0 125A 250V fuse M367E 0 063A 250V fuse WARNING For continued protection against fire replace with the same type and rating of fuse AC OPERATION Use the supplied power adapter to connect the M367 to a power outlet M367 100 120 VAC 50 60 Hz M367E 220 240 VAC 50 60 Hz The operating voltage can be switched internally see nternal Modifiable Functions NOTE Appliance inlet is the main disconnect device to power off the M367 you must unplug the power supply BATTERY OPERATION Open the battery compartment by grasping the sides of the compartment squeezing to release the locks and pulling the com partment outward Insert two 9 volt batteries During battery operation use the BATT CHECK button Press and hold to show battery level on the VU meter Press once to illu minate the VU switch for 10 seconds or set DIP swit
8. the battery com part ment 3 Slowly slide cover up and off chassis VCA DISTORTION TRIMPOT R607 DO NOT ADJUST This potentiometer is precisely calibrated on each mixer for minimum distortion VU METER ADJUSTMENT R684 This trimpot adjusts the VU meter to indicate 0 VU at a preset output level The factory setting is 4 dBm The user adjustment range is 10 dBV to 4 dBm 6 dBV to 8 dBm with DIP switch 1 down To set the VU meter to a value other than the factory setting 0 VU 4 dBm proceed as follows 1 Connect a 600 Q load to an XLR output set for Line 2 Connect an ac voltmeter with 1 MQ or greater input impedance Fluke 77 or equivalent in parallel with the load 3 Set the 1 kHz tone oscillator switch to the ON position 4 Adjust the 1 kHz tone oscillator level with the Master gain con trol until the ac voltmeter reading is at the level desired 5 With the M367 top cover removed adjust the VU Level Cali bration trim pot R684 with a screwdriver until the VU Meter reads 0 6 For 0 VU settings between 4 and 8 dBm set internal DIP switch S701 position 1 down and perform steps 1 through 5 VU METER lt CALIBRATION q TRIMPOT VCA DISTORTION TRIMPOT R684 R607 a ACCESSED THROUGH HOLE IN UPPER FRONT PC BOARD DIP SWITCH 701 q pe INTERNAL ADJUSTMENTS FIGURE 5 INTERNAL MODIFIABLE FUNCTIONS NOTE Only gualified service technicians should perform these modifications
9. when con necting to a SHURE M267 FP42 FP51 M67 or SE30 Use the M367 setting with another M367 or SHURE FP32A IMPORTANT Unless required leave the mix bus LEVEL switch in the M367 position The M367 setting may increase mixer out put noise up to 30 dB depending on the MASTER output setting Mix Bus Jack Allows you to connect the M367 to another mixer The mix bus connection is two way and pre master When two M367 mixers are connected all 12 inputs appear at both mixers outputs The MASTER gain control of either M367 can be adjusted without affecting the other mixer s output NOTE The output level of each M367 mixer drops by 6 dB when connected through the MIX BUS increase the Master Gain to compensate For a balanced mix bus connection between two M367s use a mix bus cable with two 1 4 in stereo tip ring sleeve plugs When connecting other types of Shure mixers construct a mix bus cable with a 1 4 in mono phone plug tip signal sleeve ground and the appropriate connector for the other mixer s mix bus jack see Figure 3 BALANCED TO M367 1 TO M367 2 UNBALANCED TO M367 N C TO M267 MIX BUS CONNECTIONS FIGURE 3 Channel Inputs These female XLR inputs are transformer balanced to provide superior rejection of hum RFI and other interference Monitor In Jack Accepts mono line level signals tip signal sleeve ground for tape return or a communications
10. 1 4 W 1 resistor and solder it to the holes of X734 151 4 KQ 4 Re 1 eee ae 52 5 kQ 35 000 105 000 Obtain a 49 9 kQ 1 4 W 1 resistor and solder it to the holes of X735 gt j pe ice an oe Ea ta 18 000 105 000 150 000 52 300 49 4 KQ SHURE SHURE Incorporated http www shure com United States Canada Latin America Caribbean 5800 W Touhy Avenue Niles IL 60714 4608 U S A Phone 847 600 2000 U S Fax 847 600 1212 Intl Fax 847 600 6446 Europe Middle East Africa Shure Europe GmbH Phone 49 7131 72140 Fax 49 7131 721414 Asia Pacific Shure Asia Limited Phone 852 2893 4290 Fax 852 2893 4055
11. IGURE 7 Recommended parts are Potentiometer 10 25 KQ linear taper Radio Shack 271 1715 1 4 in Stereo Phone Plug Switchcraft 280 Ferrite Bead Rings Ferronics 21 031J Capacitors ceramic 0 001 uF 50 V Cable 2 conductor shielded 50 ft maximum 15 m Ferrite bead rings and capacitors should be as close to the phone plug as possible 6 Insert the phone plug in the Monitor In jack The remote con trol potentiometer now controls M367 gain with a control taper similar to that of the Master gain control CHANGING LIMITER RELEASE TIME TO ONE SECOND Remove resistor R741 about 15 mm behind ribbon cable assembly W813 CHANGING LIMITER THRESHOLD PRESETS 1 Select the eguivalent resistor values for the desired limiter thresholds from the following table Then fill in the following work sheet with the resistor selections Limiter Threshold Reguiv Limiter Threshold Reguiv dBm into 600 2 k2 dBm into 600 2 kQ 0 18 10 81 1 21 11 93 2 25 12 105 3 30 13 122 4 35 14 139 5 41 15 156 6 47 16 175 7 54 17 194 8 62 18 215 9 71 DIP Switch 701 Limiter Threshold Reguiv above Position 2 Position 3 a dBm up up high ares kQ R1 down up med high Nana kQ R2 up down med low e kQ R3 down down low er kQ R4 2 Remove resistors R721 R731 R732 R733 R734 and R735 surrounding IC U704 3 Locate empty pads X732 X733 X734 and X735 surro
12. J863 Solder a 1 KQ 1 1 4 W resistor in the holes of X645 The Monitor In jack will now accept a stereo input signal tip left ring right sleeve ground and sum these signals to the monitor circuit NOTE If using a true stereo feed to drive the M367 Monitor In and another stereo device the source impedance must be 20 Q or less to maintain at least 40 dB separation in the stereo device Use a stereo distribution amplifier or buffer to maintain optimum stereo separation MASTER GAIN REMOTE CONTROL NOTE This modification disables both the M367 s monitor function and its front panel Master gain control 1 Remove resistor R641 near Monitor In jack J863 2 Remove resistor R746 near Master potentiometer R706 3 Locate empty pad X702 near Master potentiometer R706 Solder one end of a 100 2 1 4 W resistor in the hole of X702 Solder an insulated wire to the other end of the 100 Q resistor Locate empty pad X644 near jack J863 Solder the other end of the insulated wire to X644 4 Locate empty pad X701 next to empty pad X702 Solder an insulated wire to X701 Locate empty pads X645 near jack J863 Solder the other end of the insulated wire to the empty pad X645 nearest channel 6 input connector J856 5 Construct a remote control potentiometer cable assembly as shown in Figure 7 EN O i O TIP Er O t l OX 6 0 RING aa os O e O SLEEVE MASTER GAIN REMOTE CONTROL F
13. SDN hard disk recording and DAT Sound reinforcement The M367 comes with rubber feet detachable power cord and spare power line fuse It can be rack mounted using the optional Model A367R rack mount kit FEATURES Six selectable mic line inputs e Selectable mic line output and dedicated line output e Transformer balanced inputs and outputs for superior rejection of RFI and electromagnetic hum e Professional mechanical VU meter LED backlighting for high reliability no lamp replacement 2008 Shure Incorporated 2708511 Rev 5 Headphone monitoring 3 5 mm 1 4 in Output peak limiter with switchable threshold and bi colored LED indicator Peak indicator LED and switchable low cut filters on each input 1 4 in return monitor input AC power or 2 9V battery operation ADDITIONAL FEATURES 48 Vdc or 12 V phantom power for condenser microphones 1 kHz tone oscillator e Mutes all input channels when activated e Tone level control is on the master Wide range input gain controls handle hot signal levels without attenuators Customized operation via internal DIP switches trim pots and optional alternate wiring Battery check switch and low battery warning indication Power on LED Input expansion via mix bus jack to link M367s or other mixers Rugged all metal chassis with protective end caps Detachable AC power cord z C Printed in U S A w FRONT PANEL CONTROLS AND INDICATORS E ja a Ta Sa T
14. SHURE Model M367 User Guide SIX CHANNEL MICROPHONE MIXER 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 manu facturer s instructions 8 DO NOT install near any heat sources such as radiators heat registers stoves or other apparatus including amplifiers that produce heat 9 DO NOT defeat the safety purpose of the polarized or grounding type plug A polarized plug has two blades with one wider than the other A grounding type plug has two blades and a third grounding prong The wider blade or the third prong are provided for your safety If the provided plug does not fit into your out let consult an electrician for replacement of the obsolete outlet PROTECT the power cord from being walked on or pinched particularly at plugs convenience receptacles and the point where they exit from the apparatus 11 ONLY USE attachments accessories specified by the manufacturer POT Ne 12 15 16 17 18 19 20 IMPORTANT SAFETY INSTRUCTIONS USE only with a cart stand tripod bracket or table specified by the manufacturer or sold with the apparatus When a cart is used use caution when moving the cart apparatus combination to avoid Ae injury from tip over UNPLUG this apparatus during lightning storms or w
15. ch 6 for con tinuous illumination see DIP Switches BATTERY LIFE With two fresh 9 volt alkaline batteries the M367 operates for about eight hours Some mixer features decrease battery life as il lustrated in the following table NOTE Momentary use of headphones or meter illumination will not appreciably affect battery life Mixer Operation Battery Battery Current Life mA hours No Signal 40 9 With 4 dBm continuous output 45 8 With six mics at 12 V phantom power 55 6 5 With six mics at 48 V phantom power 70 5 With output to headphones 50 7 With meter illumination continuously on 75 4 5 until Power LED begins to flash allowing approximately 30 minutes to replace batteries CONNECTING M367 OUTPUTS TO TELEPHONE LINES Use the XLR outputs at line level to drive dc biased dialed up telephone lines A slight increase in distortion may occur Use the M367 limiter with the limiter threshold set to 4 dBm Modify the M367 output impedance to 600 Q for proper fidelity see Internal Modifiable Functions When connecting the M367 to a telephone line you must use an FCC Registered interface adapter between the mixer and telephone line SETTING LEVELS 1 Set the MASTER gain knob to the full off position 2 Activate the 1 khz tone oscillator by setting the 1 KHZ TONE switch to ON Adjust the MASTER gain until the VU meter needle indicates 0 Adjust the input levels on the equip
16. es potentiometer R648 Solder a 68 kQ 1 4 W resistor through the holes at X649 to hear program audio 12 dB down from standard headphones level with Pull Monitor switch on pulled out Solder a 24 kQ 1 4 W resistor through the holes at X649 to hear program audio 6 dB from standard headphones level with Pull Monitor switch on pulled out CHANGING LOW CUT FILTER CORNER FREQUENCY 3 DB DOWN POINT To decrease corner frequency 1 Calculate new capacitor value for lower low cut corner frequency Use the following formula C in uF 85 frequency 0 33 Example for 200 Hz corner frequency 85 200 9 0 43 0 43 0 33 0 1 For 200 Hz corner frequency use a 0 1 uF capacitor NOTE Capacitor must be non polarized ceramic or film type 16V rating or higher Pad Channel Pad Channel X421 1 X451 4 X431 2 X521 5 X441 3 X531 6 2 Locate the following empty pads Find all pads near ribbon cable assemblies W811 W812 and W813 3 Solder a new capacitor through the holes of the empty pads for each channel to be modified To increase corner frequency Note Low cut corner frequencies much higher than the factory preset of 260 Hz may excessively attenuate desired low to mid frequency program material 1 Locate the following capacitors near empty pads Capacitor Pad Channel Capacitor Pad Channel C425 X421 1 C455 X451 4 C435 X431 2 C525 X521 5 C445 X441 3 C535 X531 6
17. hen unused for long periods of time REFER all servicing to gualified service personnel Servicing is reguired when the apparatus has been damaged in any way such as power supply cord or plug is dam aged liguid has been spilled or objects have fallen into the apparatus the apparatus has been exposed to rain or moisture does not operate normally or has been dropped DO NOT expose the apparatus to dripping and splashing DO NOT put objects filled with liguids such as vases on the apparatus The MAINS plug or an appliance coupler shall remain readily operable The airborne noise of the apparatus does not exceed 70dB A Apparatus with CLASS construction shall be connected to a MAINS socket outlet with a protective earthing connection To reduce the risk of fire or electric shock do not expose this apparatus to rain or moisture Do not attempt to modify this product Doing so could result in personal injury and or product failure DESCRIPTION The Shure M367 is a portable six input two output mono battery powered microphone and line level mixer preamplifier Its transformer isolated design low noise performance and compact and rugged construction make the M367 an ideal choice for studio and mobile broadcast electronic news gathering ENG and electronic field production EFP applications This versatile mixer can also be used for the following e Digital transmission links e Digital video audio recording media I
18. ine Out Non Inverting Mic Line In to Phones Non Inverting Equivalent Input Noise 127 dBV with 150 Q source 400 to 20 000 Hz Output Noise Master level full CCW 100 dBV 400 to 20 000 Hz Master level full CW 80 dBV 400 to 20 000 Hz Hum and Noise Equivalent Input lt 125 dBV 20 to 20 000 Hz Output 95 dBV Master CCW 75 dBV Master CW 20 to 20 000 Hz Common Mode Rejection Ratio 65 dB at 100 Hz 20 dBV input Mic Line In to Mix Bus tip Inverting Output Monitor to Phones Non Inverting Input Line Mic Phones MixBus Mix Mix Bus to Mic Line Out Inverting M367 Bus 7 Overload and Shorting M267 Shorted outputs even for prolonged periods cause no damage Low ZMic 87 dB 40 dB 103 dB 66 dB 27 dB Microphone inputs of up to 3 Vrms cause no damage Line and 150 9 monitor can withstand signals of up to 30 Vrms Input Peak Indicators Line 37 dB 11 dB 53 dB 15 dB 25 dB 6 dB below clipping level Monitor 12 dB E Output Peak Indicator E Lights red at 6 dB below clipping level Mix Bus 10 dB 38 dB 26 dB Output Clipping Level M367 lt 18 dBm at line output into 600 Q ine a rae Seda Low Cut Filters Matan a 7 dB down at 150 Hz 6 dB octave slope 3 dB down at 260 Hz M267 Tone Oscillator Agut 1 kHz 20 npuss Limiter IMPEDANCE Input Threshold Switchable 0 4 8
19. is equipment This equipment has been tested and found to comply with the limits for a Class B digital device pursuant to Part 15 of the FCC Rules and as set out in the Radio Interference Regulations of the Cana dian Department of Communications These limits are designed to provide reasonable protection against harmful interference in a residential installation This equipment generates uses and can radiate radio frequency energy and if not installed and used in ac cordance with the instructions may cause harmful interference to radio communications However there is no guarantee that inter ference will not occur in a particular installation If this equipment causes harmful interference to radio or television reception deter mined by turning the equipment off and on try to correct the inter ference by one or more of the following measures 1 Reorient or relocate the receiving antenna 2 Increase the separation between the equipment and receiver 3 Connect the equipment into an outlet on a circuit different from that to which the receiver is connected 4 Consult the dealer or an experienced radio TV technician for help INTERNAL ADJUSTMENTS NOTE Only gualified service technicians should perform these modifications These internal adjustments reguire only removal of the top cover 1 Remove battery compartment 2 Remove four screws securing two plastic end caps and one ground bonding screw on the side opposite
20. ment connected to the M367 outputs accordingly Deactivate the tone by setting the 1 KHZ TONE switch to OFF 3 Adjust the Input gain controls based on the incoming signal levels The input PEAK LEDs should flicker red only on loud input peaks 4 Observe the output on the VU meter and adjust the MASTER gain to obtain the desired levels try to keep the average levels around 0 VU The PEAK LED adjacent to the VU meter should illuminate only on loud output peaks DIP SWITCHES 1234 5 6 7 S701 Access the DIP switches by removing the battery compartment and top cover Use the following table to set the switches Bold factory setting s Function Up Down z n 1 Meter 0 VU 0 VU 4 dBm 0 VU 8 dBm 2 Limiter See Figure 4 Threshold 3 4 Program to Off On adds attenu Monitor ated program signal in headphones with Pull Monitor switch on 5 Monitor In Normal High Gain 6 VU Lamp Batt Timed Turns off Toggled press on Check button after 10 seconds press off 7 Phantom 12 Vdc 48 Vdc Power Limiter Threshold 16 dBm 8 dBm 4 dBm 0 dBm LIMITER THRESHOLD SETTINGS FIGURE 4 SPECIFICATIONS Freguency Response 20 to 20 000 Hz 2 0 dB channel controls centered Total Harmonic Distortion 0 25 THD at 4 dBm output 55 to 20 000 Hz Voltage Gain Polarity Mic Line In to Mic L
21. s once to illuminate the VU meter for 10 seconds or set DIP switch 6 to toggle the meter light see DIP Switches 9 Power On Off Switch Turns the mixer on and off 10 Power On LED Green poweron low batteries about 30 minutes of operation remaining Flashing 11 Dual function control knob Headphones Gain Control level Pull Monitor Switch When using headphones pull out to listen to audio from the MONITOR IN jack Add attenuated program signal using DIP switch 4 see DIP Switches Rotate to adjust headphone WARNING The headphones circuit can produce high volume levels that can damage the user s hearing Make sure headphone volume setting PHONES is low Full CCW before putting headphones on 12 Headphones Outputs Stereo 1 4 in and 3 5 mm phone jacks 13 Master Gain Control Sets mixer output gain Set to 0 dB position for unity gain REAR PANEL CONNECTORS AND CONTROLS 100 120 VAC 50 60 Hz 100 mA MONITOR IN 6 5 4 3 2 1 ae a ee Af it REAR PANEL CONNECTORS AND CONTROLS FIGURE 2 Mic Line Level Output Switch Sets output to microphone or line level Phantom Power Switch Adds 12 volt phantom power to all inputs set to MIC Use DIP switch 7 to increase voltage to 48 volts see DIP Switches Mic Line Level Input Switches 1 6 Sets input to microphone or line level Phantom power is disabled for inputs set to LINE M267 M367 Mix Bus Level Switch Set to M267
22. unding IC U704 4 Select a 1 4 W 1 resistor closest in value to R1 from the work sheet and solder it to the holes of X732 Note Use parallel or series combinations of resistors to match the chosen values as closely as possible if 1 resistors are not 5 Calculate resistor R5 value as follows available 1 R5 a ot R2 R1 Select a 1 4 W 1 resistor closest in value to R5 and solder it to the holes of X733 10 6 Calculate resistor R6 value as follows 1 aa R3 R1 Select a 1 4 W 1 resistor closest in value to R6 and solder it to the holes of X734 7 Calculate resistor R7 value as follows 1 ai at ce al Eo el R4 R1 R5 R6 Select a 1 4 W 1 resistor closest in value to R7 and solder it to the holes of X735 See Changing Limiter Threshold Presets Samples Calculations later in the Appendix for an example of limiter threshold preset component calculations R6 R7 CHANGING LIMITER THRESHOLD PRESETS SAMPLES CALCULATIONS For the following limiter thresholds DIP Switch S701 Limiter Threshold Reguiv Position Position dBm 2 3 up up high 12 105 kQ R1 down up med high 8 62 kQ R2 up down med low 4 35 kQ R3 down down low 0 18 kQ R4 1 Obtain a 105 kQ 1 4 W 1 resistor and solder it to the holes of X732 2 Obtain a 150 kQ 1 4 W 1 resistor and solder it to the holes of X733 pee 3 Rs toy oo ie 62 000 105 000 3 Obtain a 52 3 kQ
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