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MON-10 Switcher
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1. MON 10 Instruction Manual
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3. 12a and the L position on S12b The sin gle ended right channel output from IC 12b is fed to the Page 5 R and L R position on switch S12b and the R posi tion on S12a The right channel signal is also inverted by IC3b and fed to the L R position on switch S12b The output of the SOURCE switch S12a is fed through the VOLUME pot R38a and buffer amp IC6 to the J6 HEADPHONE jack tip contact Likewise the output of S12b is fed through VOLUME pot R38b and buffer amp IC5 to the J HEADPHONE jack ring con tact The output of the J6 tip ring switching contacts are combined by R44 and R45 to form a mono sum and fed through power amp IC9 to the rear panel AMP OUT terminal This terminal may be connected to an external speaker or it may be connected to the IN TERNAL SPEAKER terminal so that the speaker on the front panel is active The output of S12a and S12b are also combined to a mono sum by R32 and R33 and fed to op amp IC 4b which amplifies the signal and feeds it though the me ter trim control R32 to the front panel VU meter The gain of IC4a and thus the calibration of the meter is set by the resistor selected by the METER switch 11 The meter may be more precisely trimmed by adjust ing R30 for the desired reading The output of IC4b also feeds D3 which rectifies the signal and feeds holding capacitor C9 decay time resistor R28 and op amp IC4a IC4a works as a com parator comparing the rectified aud
4. 7 N N i A Lo gitek MON 10 Meter Monitor amp Switcher Operation amp Service Manual All information contained herein is con fidential No portions of this manual may be reproduced by any means with out written permission from Logitek Electronic Systems Inc COPYRIGHT 1990 LOGITEK ELECTRONIC SYSTEMS INC MON 10 INSTRUCTION MANUAL Table of Contents SECTION 1 GENERAL INFORMATION 1 1 General Description 2 1 2 Physical Description oooooooccoccccna Erana ka REE a E a R 2 1 3 Electrical Specifications 0 0 0 0 0 0 cee 2 1 4 Instrument Identification 2 1 5 Where to find hein 2 SECTION 2 PREPARATION FOR USE 2 1 Initial INSPECHON EEN eee a ee ee ee 3 AA A apa vets tet Sid Pag dads a cease pageant ge 3 2 3 Repacking for Shipment ooccocccccoccc Ea a E a 3 2 4 Installation voii ri RR nae ELE Md Re EE aie 3 2 5 Connecting Inputs and Outputs 2 2 sssaaa aeee ee eee 3 SECTION 3 OPERATING INSTRUCTIONS 3 1 Input Selector Pushbuttons 2 0 0 0 eens 4 83 2 SOURCE SWICK oras tadan bade inna E EE tyes eee pedes 4 3 3 METER SWICN auser faba ood ee Ri aa Saeed ee ees 4 3 4 VOLUME Control 4 SECTION 4 PRINCIPLES OF OPERATION 4 1 General Information s 000 cette 5 4 2 FUSO feces eee renar cha ete badd deed bee eee eee dan tee dead oh ede 5 423 TTT EE 5 4 4 Switching and Amplification Circuit 5 SECTION 5 REPLACEMENT PARTS LIST Bl MONA Oia ere ease eb A C
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6. Electrical Specifications Number of Inputs 10 stereo Input Level normal 0 dBu maximum 23 dBu Input Impedance 140kohms Line Output Level Line output switching is passive so the output level impedance and balancing is the same as that of the selected input Speaker Output Level maximum 6 watts Speaker Output Noise ref 0 dBu input 60 dBu AC Line Input Voltage 50 60 hz 105 129 V optional factory modification for 220 240 VAC 1 4 Instrument Identification The MON 10 is identified by a model number and a three or four digit serial number The model number MON 10 Instruction Manual and serial number appear on a label on the back ofthe unit near the power cord All correspondence to your Logitek dealer or to the Logitek factory should refer to the model number and serial number 1 5 Where to find help Logitek customer service personnel are available to help with any questions comments or problems you might have with the MON 10 both during and after the warranty period Our hours of operation are 8AM to 5PM central time We may be contacted in one of the following ways By Phone 877 231 5870 U S A 8 Canada or 713 664 4470 By Fax 713 664 4479 By Email help logitekaudio com By Mail Logitek Electronic Systems Inc 5622 Edgemoor Drive Houston TX 77081 USA Page 2 SECTION 2 PREPARATION FOR USE 2 1 Initial Inspection Check the shipping carton carefully for external dam
7. Rectifiers RT1 1A bridge GI DF10M Switches S 1 10 Input selector EC 10XTA15 NONE 4UGRA S11 Meter selector GR 71BDF30 01 1 AJN 12 Source selector GR 71BDF30 02 1 AJN 10 pc Pushbutton cap SH FA20108010112 2 pc Knob SO S211 250BLACK 2 pc Cap with line SO C211BLACK Speakers SP1 Speaker IC S300SA Transformers T1 36v 1A ST P8671 T1 220V version 36V 1 2A 220V primary SI A41 43 36 Terminals 4 pc Terminal blocks RD 3PCV 15 Label strip AD 4 15230 0030 Page 7 Label strip holder Label strip window Power cord Selector card Terminal card Amp card AD 4 25357 0020 AD 4 25358 0140 BE 17251 LG 131B LG 132A LG 133D MON 10 Instruction Manual SECTION 6 MANUFACTURERS LIST CODE MANUFACTURER LOCATION AA Aavid Engineering Laconia NH AD ADC Minneapolis MN BE Belden Wire and Cable Richmond IN BN Bourns Inc Ogden UT BQ Bergquist Co Minneapolis MN CE Centralab Electronics Div Milwaukee WI CL Clarostat Mfg Co Inc Dover NH CM Chicago Miniature Lamp Inc Buffalo Grove IL EC Electronic Components Groupe Minneapolis MN EM Ecam Technology Scottsdale AZ Gl General Instruments Quality Technologies Sunnyvale CA GR Grayhill Inc LaGrange IL IC Intervox International Components Corp Melville NY IE Industrial Electronics Engineers Van Nuys CA IL Illinois Capacitor Lincolnwood IL LF Littlefuse Inc Des Plaines IL LG Logitek Circuit cards Houston TX MO Motorola Semiconductor Products Pho
8. TI TLO72CP 1C5 6 Dual Quiet op amp SG NE5532N IC7 18 volt regulator Tl uA7918CKC IC8 18 volt regulator Tl uA7818CKC IC9 Power op amp NA LM1875T 6 pc 8 pin dip socket EM 100 083 10 1005 1 pc Heat sink pc mount AA 5632B 2 pc Heat sink clip TM 6045B 1 pc TO 220 insulator BQ K4 54 AC Connectors J1 6 pin large dip socket PN CE156F20 6A J2 3 6 pin socket PN CE100F28 6A J4 5 3 pin socket PN CE100F28 3A J6 Headphone jack SW RN114BPC J7 10 40 pin socket PN 050 040 455 J11 3 pin socket PN CE100F28 3A P1 6 pin header large PN MFSS156 6A P2 3 6 pin header PN MFSS100 6A P4 5 3 pin header PN MFSS100 3A P7 10 40 pin header PN 051 040 153 P11 3 pin header PN MFSS100 3A P14 Power entry module SR 6200 4115 Meter M1 2 1 2 VU meter SO AL29R B SCALE 1 pc 2 1 2 light box SO 29 LIGHT BOX 12VDC 1 pc Light bulb CM 382 MON 10 Instruction Manual Page 6 SYMBOL DESCRIPTION LOGITEK PART NUMBER Resistors R1 4 69 8K 1 R5 8 4220 1 R9 12 69 8K 1 R13 16 4220 1 R17 6810 1 R18 1540 1 R19 909 1 R20 562 1 R21 174 1 R22 53 6 1 R23 24 5100 R25 560 R26 11 5K 1 R27 5100 R28 1M R29 5000 peak trim BN 3386P 1 502 R30 10K meter trim BN 3386P 1 103 R31 1000 R32 33 20K R34 1000 R35 10K R36 37 10 R38a b 10K ohm VOLUME pot CL 70W1N04S103A R39 1000 R40 10K R41 42 10 R43 1000 R44 45 10K R46 1000 R47 1 2 R48 10K R49 150 1 pc Knob SO S211 250BLACK 1 pc Cap with line SO C211BLACK
9. age If the carton shows evidence of abuse ask the carrier s agent to be present when the unit is un packed Carefully unpack the unit to avoid damaging the equipment through the use of careless proce dures Inspect all equipment for damages immediately after unpacking Bent and broken parts dents and scratches should be noted If damage is found refer to paragraph 2 2 for recommended claim procedures Keep all packing material for possible future use 2 2 Claims If the unit has been damaged notify the carrier im mediately File a claim with the carrier and advise Logitek of such action to arrange for repair or replace ment without waiting for a claim to be settled with the carrier 2 3 Repacking for Shipment If the unit must be returned to Logitek attach a let ter to it showing the owner s name and address A de scription of necessary service should be included in the letter The original shipping carton and packaging materials should be used for reshipment if possible Use FRAGILE labels on each surface Return the unit freight prepaid Be sure to insure the unit for its full value The unit will be repaired promptly and returned freight prepaid 2 4 Installation The MON 10 is designed to be mounted in a stan dard 19 equipment rack by using the four mounting holes in the corners of the front panel While flow through ventilation is not necessary the unit should not be mounted directly above equipment which produ
10. ces significant heat such as equipment using vacuum tubes The unit should never be oper ated if the ambient temperature is above 55 degrees C 131 degrees F 2 5 Connecting Inputs and Outputs All inputs and outputs except the headphone out put are connected via the barrier strips on the rear panel These terminals are wire capturing so it is not necessary to attach crimp lugs to each wire before fastening the wire to the terminal Crimp lugs may be used however if desired Balanced line level inputs and the line output should be connected the to terminals as indicated on the rear panel Unbalanced sources can be fed to the MON 10 by connecting the hot lead from the unbal anced source to the input terminal on the MON 10 while connecting the terminal on the MON 10 to the accompanying MON 10 ground terminal Page 3 Unbalanced equipment can be fed from the output of the MON 10 by connecting the terminal on the MON 10 to the hot input on the unbalanced equip ment while leaving the terminal on the MON 10 un connected Connect the cable shield to the ground side of the input connector on the unbalanced unit When feeding unbalanced equipment from the output of the MON 10 it is important that the output termi nal be left unconnected Connecting this terminal to ground will not harm the equipment However it might cause undesired crosstalk Care should be taken to b
11. e sure that cable shields are connected to grounded equipment on only one end of the cable On any cable which connects two pieces of equipment of which both are grounded the cable shield must be left unconnected on one end or poor noise performance may result An external speaker may be connected to the SPEAKER OUT terminals on the rear panel For best performance be sure that the speaker ground return is connected to the indicated ground terminals on the unit To use the speaker on the front panel connect the SPEAKER OUT terminal to the INTERNAL SPEAKER terminal DO NOT CONNECT BOTH AN EXTERNAL SPEAKER AND THE INTERNAL SPEAKER AT THE SAME TIME AS THE AM PLIFIER MAY BE DAMAGED IF YOU DO MON 10 Instruction Manual SECTION 3 OPERATING INSTRUCTIONS 3 1 Input Selector Pushbuttons The meter monitor and outputterminals can be fed from any one often different stereo inputs The inputis selected by depressing any of the ten pushbuttons on the front panel Inputs may be labeled using the re movable label strip under the pushbuttons 3 2 SOURCE Switch The SOURCE switch determines the mode of the signal fed to the meter and monitor but DOES NOT af fect the line output signal From the stereo input se lected on the input selector pushbuttons the SOURCE switch selects the left channel the right channel the mono sum L R or the out of phase dif ference L R signal to feed to the meter and monitor allowing a vis
12. ee ee eS 6 SECTION 6 MANUFACTURERS LIST SECTION 7 DIAGRAMS Page i MON 10 Instruction Manual SECTION 1 GENERAL INFORMATION 1 1 General Description The Logitek MON 10 is a mechanical routing switcher a six range VU meter and a six watt amplifier all in one convenient rack mounted unit The MON 10 features ten balanced stereo inputs any one of which can be selected using front panel pushbuttons The selected input is passively fed to balanced output terminals on the rear panel It is also buffered and fed to a four position source mode switch This switch selects whether the meter and monitor will be fed the left channel the right channel the mono sum L R or the out of phase difference L R The output of the source mode switch feeds a meter amp which in turn feeds a built in VU meter and peak LED The VU meter can be switched between any of six ranges as determined by the front panel meter switch The mode switch also feeds a six watt monitor amp which in turn feeds either a built in speaker headphones or an external speaker 1 2 Physical Description The Logitek MON 10 is constructed within a 3 1 2 Hx 19 W X 7 D cabinet which is designed to take up two rack spaces in a standard 19 equipment rack The power cord fuse and all connections except the headphone jack are located on the rear panel The headphone jack meter speaker and all controls are located on the unit s front panel 1 3
13. enix AZ NA National Semiconductor Santa Clara CA PN Panduit Corp Tinsley Park IL RD Reed Devices Inc Carol Stream IL SG Signetics Corporation Sunnyvale CA SH ITT Schadow Inc Eden Prairie MN SI Signal Transformer Inwood NY SL AVX Stantel Corp Myrtle Beach SC SO Selco Products Buena Vista CA SR Schurter Inc Petaluma CA ST Stancor Products Logansport IN SW Switchcraft Inc Chicago IL Tl Texas Instruments Inc Dallas TX TM Thermalloy Inc Dallas TX MON 10 Instruction Manual Page 8 SECTION 7 DIAGRAMS rent Am E TN ano Q aaannr gtd Z d BD 94 Sd NI of CH Ed yanvads n d vzel 97 Gua Ee 6 P L gt en n i oL 8164 T EES DIE des 1 9 ar LSE Les eee 2 a Da T Sto ZHOS 9 N iI 3 gp SR TE EK 4 ST ELA CM a lt xF 3 N Logoen os Z f Kg HA Deche GO Tex EM ENSCH SS Z S NON pub Bei se io ome Set waster z e D9 94 Slerez lt ENSCH Btz ld DIE mea 1d 1L9
14. io signal of the peak adjust control R29 When the audio signal ex ceeds the threshold determined by the setting of R29 IC4a supplies current to turn on the peak led D1 MON 10 Instruction Manual SECTION 5 REPLACEMENT PARTS LIST All replacement parts are stocked in depth at the Logitek factory Most are also available through local electronic parts distributors For your convenience in purchasing replacement parts locally we include the following parts list All Logitek part numbers consist of a two letter manufacturer code followed by that manufacturer s standard part num ber for the item A List of manufacturers arranged alphabetically by manufacturer code follows this parts list in Section 7 All resistors are 1 4 watt 5 tolerance unless otherwise noted SYMBOL DESCRIPTION LOGITEK PART NUMBER 5 1 MON 10 Capacitors C1 4 47uf 10V non polar electrolutic NI UES1A470MPJ C9 01uf 16V ceramic CE UK16 103 C10 15uf 20V tantalum SL TAP156K020CCS C11 22uf 50V tantalum SL TAP224K050HSB C12 13 1000uf 35V electrolytic IL 108TTA035M C14 18 10uf 25V tantalum SL TAP106K025HSB C19 33 50V polyester film IL 33MSS063K C20 1uf 35V tantalum SL TAP105KO35HSB Diodes D1 Red LED IE LL203R D2 3 Small signal diode MO 1N4148 D4 5 1A signal diode MO 1N4001 D6 6 3V zener 1W MO 1N4735 D7 8 1A signal diode MO 1N4001 D9 6 3V zener 1W MO 1N4735 Fuses F1 1 2 amp slow blow 20mm LF 239 250 Integrated Circuits 1C1 4 Dual bi fet op amp
15. ual and aural evaluation of channel bal ance and source phasing 3 3 METER Switch The METER switch determines the 100 VU level of the meter By selecting any of the six positions the user can measure audio levels over a wide range The METER switch DOES NOT affect the line output or the speaker and headphone level 3 4 VOLUME Control This control sets the level fed to the internal speaker the external speaker and the headphone jack It DOES NOT affect line output signal or the me ter MON 10 Instruction Manual Page 4 SECTION 4 PRINCIPLES OF OPERATION 4 1 General Information The MON 10 is designed to need a minimum of maintenance for long trouble free operation Should repair be necessary the technician should first read the information in the manual concerning the circuits in question and should follow proper procedures for testing and replacing semiconductors Logitek engi neers are readily available at the factory to provide technical assistance both during and after the war ranty period 4 2 Fuse The primary winding of the power transformer is fused with a 1 2 amp slow blow type 20mm fuse housed in a fuse holder on the rear panel of the unit It should only by replaced with fuses of the same type and current rating ERA a a we IMPORTANT NOTE kk kk kk x Do NOT replace fuses without first disconnecting the amplifier s power cord from the wall socket as dangerous voltages are present
16. which may cause electrical shock Always use fuses of the same value and type as specified in this manual Do NOT use fuses of a higher value than those specified as shock hazard and fire hazard may result kk kk kk kk kk kk kk kk kk ETE TEE A blown fuse is most often although not always a symptom of another failure Related circuitry should always be carefully examined after any fuse failure especially if a replacement fuse also blows 4 3 Power Supply Each MON 10 contains a well regulated power supply to create necessary operation voltages T1 is acenter tapped step down power transformer which is loaded with a full wave bridge rectifier RT1 The DC outputs of RT1 are filtered by capacitors C11 and C12 and fed to two voltage regulators IC8 and IC7 These regulators provide positive and negative 18 volt outputs which feed the unit s amplifier stages 4 4 Switching and Amplification Circuitry Input signals to the MON 10 are selected by the in put selector pushbuttons S1 S10 and fed directly to the LINE OUT terminals on the unit s rear panel The left channel of the selected input signal is also fed to IC1b which isolate the signal and convert it to a sin gle ended source The right channel of the selected input signal is similarly fed to IC2a and IC2b which do the same as ICla and IC 1b The single ended left channel output from IC 1b is fed to the L L R and L R position on the SOURCE switch S
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