MS-702 Manual - Clear-Com
Contents
1. dp Clear Com AN HME COMPANY Encore MS 702 Two Channel Main Station Instruction Manual Document Reference Encore MS 702 Two Channel Main Station Instruction Manual Part Number 810342Z Rev 4 Legal Disclaimers Copyright 2013 HME Clear Com Ltd All rights reserved Clear Com the Clear Com logo and Encore are registered trademarks or trademarks of HM Electronics Inc The software described in this document is furnished under a license agreement and may be used only in accordance with the terms of the agreement The product described in this document is distributed under licenses restricting its use copying distribution and decompilation reverse engineering No part of this document may be reproduced in any form by any means without prior written authorization of Clear Com an HME Company Clear Com Offices are located in California USA Cambridge UK Montreal Canada and Beijing China Specific addresses and contact information can be found on Clear Com s corporate website www clearcom com Clear Com Contacts Americas and Asia Pacific Headquarters California United States Tel 1 510 337 6600 Email CustomerServicesUS Clearcom com Europe Middle East and Africa Headquarters Cambridge United Kingdom Tel 44 1223 815000 Email SalesSupportEMEAO Clearcom com Canada Office Quebec Canada Tel 1 450 653 9669 China Office Beijing Representative Office Beijing P R China Tel 008610 85282. 1 Front Panel Talk Buttons Each channel has an illuminated ta k button for activating the microphone feed to that channel Each talk button has a dual action momentary or latching feature depending on how the button is pressed If desired the latching function for each channel can be defeated using the option switches on the rear panel The following describes the various functions of these multi purpose buttons e MOMENTARY Press and hold the talk button while you are speaking Release it when you are finished e LATCHING Press the talk button quickly to latch the talk function Press the button again to turn off the talk function TALK INDICATION The talk button will illuminate yellow whenever the talk function is activated The ta k button illuminates blue whenever the station is receiving power but the talk function is off CALL INDICATION The call button will flash red when a call signal is received on that channel CALL ON TALK Each channel can optionally be set to send a call signal whenever you press the talk button This function activates program interrupts or any other call activated function available on other stations Option switches on the rear panel enable this function e SPEAKER MUTE If the front panel speaker is turned on pressing either talk button will reduce the speaker output level to avoid feedback The talk buttons can be labeled to indicate their function To label the talk buttons use
3. 8748 CONTENTS IMPORTANT SAFETY INSTRUCTIONS OPERATION sosa nora 1 1 Introduction MD as 1 1 Descrip AA alle ges O a ge RES 1 1 Opera ili RE a aaa a EINA 1 2 Front Panel a 1 2 Rear Panelin k kenan ake ace ek er A le eh AEE Mn 1 7 Re Setting Program Interrupt Options 1 10 INSTALCATION terece daba weak na k pares dere ka 2 1 MAINTENANCE Send n b n ka ae Si Ey ur 3 1 Introduction in rai 3 1 MS 702 Block Diagram 0 0 0 0 kK KK KK KK KK KK KK KK KK KK KK KK KO 3 1 Troubleshooting Tips 3 2 Parts List are A We A Q We ab b be bee eee 3 4 SPECIFICATIONS sx Zan nak take kan h lda a y r n 4 1 LIMITED WARRANTY ee eee KK RR KK es 5 1 Warranty Pertodi o lo lak 5 1 Technical SUpPOTt 554 140 412 i a 5 1 Warranty Repairs and Returns X kk KK KK KK KK KK KK KK KK KK KK 5 2 Non Warranty Repairs and Returns 5 2 Extended Warranty 5 2 Service Contracts oi us dar ca a rei peso it be ay 5 3 Teta bility estes cece eco A oa iena 5 3 Clear Com i MS 702 Two Channel Main Station Instruction Manual 11 Two Channel Main Station Please read and follow these instructions before operating this product IMPORTANT SAFETY INSTRUCTIONS ON Y RI A 10 11 12 13 14 15 Read these instructions Keep these instructions Heed all warnings Follow all instructions Do not use this apparatus near water Clean only with dry cloth
4. Do not block any ventilation openings Install in accordance with the manufacturer s instructions Do not install near any heat sources such as a radiators heat registers stoves or other apparatus including amplifiers that produces heat Do not defeat the safety purpose of the polarized or grounding type plug A polarized plug has two blades with one blade wider than the other A grounding type plug has two blades and a third grounding prong The wide blade or 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 Protect the power cord from being walked on or pinched particularly at plugs convenience receptacles and the point where they exit from the apparatus Only use attachments accessories specified by the manufacturer Use only with the 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 injury from tip over Unplug this apparatus during lightning storms or when unused for long periods of time Refer all servicing to qualified service personnel Servicing is required when the apparatus has been damaged in any way such as power supply cord or plug is damaged liquid has been spilled or objects have fallen into the apparatus the apparatus has been exposed to rain or moisture does not oper
5. Listen controls 2 Sidetone null controls 2 Talk buttons 2 Call buttons 1 Tone alert button 1 RMK button 1 Speaker ON OFF switch 2 Short LEDs Power Requirements 90 240 VAC 50 60 Hz 60 VA Environmental 32 122 F 0 50 C Dimensions 19 in W x 1 75 in H x 6 5 in D 483 mm x 44 mm x 165 mm Clear Com MS 702 Two Channel Main Station Instruction Manual Weight 5 0 Ibs 2 75 kg Notice About Specifications While Clear Com makes every attempt to maintain the accuracy of the information contained in its product manuals that information is subject to change without notice Performance specifications included in this manual are design center specifications and are included for customer guidance and to facilitate system installation Actual operating performance may vary Clear Com 4 MS 702 Two Channel Main Station Instruction Manual Clear Com MS 702 Two Channel Main Station Instruction Manual LIMITED WARRANTY This document details the Clear Com Standard Limited Warranty for all new products for sale within all regions with the exception of Military Aerospace and Government MAG EXCEPT AS SET FORTH HEREIN LIMITED WARRANTY CLEAR COM MAKES NO OTHER WARRANTIES EXPRESS IMPLIED OR STATUTORY INCLUDING WITHOUT LIMITATION ANY WARRANTIES OF MERCHANTABILITY NONINFRINGEMENT OF THIRD PARTY RIGHTS OR FITNESS FOR A PARTICULAR PURPOSE ALL OF WHICH ARE EXPRESSLY DISCLAIMED 1 Standard Limi
6. input Input Level 0 dBV Input Impedance gt 100 KQ Frequency Response 150 Hz 18 KHz 2 dB Termination Impedance Impedance 2000 switchable Power Supply Type Switching with overcurrent limiting and reset circuitry for each channel Output Voltage 30 volts DC regulated Output Current 1 2A Continuous 2A Peak Do not exceed the 1 2A rating for more than 2 seconds per 30 second period 1 75A max any channel with electronic current limiter Do not exceed the 1 2A rating for more than 2 seconds per 30 second period S 702 Two Channel Main Station Instruction Manual Short Circuit Reset Time lt 15 s Hum and Noise lt 80 dBv Station Capacity Capacity Maximum of 60 headset stations or 20 speaker stations distributed over both channels Rear Panel Connectors Intercom 6 XLR 3M 3 per channel Announce Out 1 XLR 3M audio Announce Relay 1 1 4 in 0 64 cm phone jack relay Program 1 XLR 3F Hot Mic IFB Interface 1 1 4 in 0 64 cm phone jack AC Power IEC 320 connector Rear Panel Controls 2 Termination On Off switches 8 Option switches 1 Power switch 1 Tone alert volume control Front Panel Connectors Panel Mic 1 1 4 in 0 64 cm panel mounting jack Headset 1 XLR 5F Front Panel Controls amp Indicators 1 Panel headset mic switch 1 Announce button 1 Party line link button 2 Program ON OFF INTERRUPT switches 3 Program level controls 2
7. requirements And thereby compliance with the requirement of Electromagnetic Compatibility Directive 2004 108 EC and Low Voltage Directive 2006 95 EC This device complies with Part 15 of the FCC Rules Operation is subject to the following two conditions 1 this device may not cause harmful interference and 2 this device must accept any interference received including interference that may cause undesired operation Clear Com MS 702 Two Channel Main Station Instruction Manual The MS 702 two channel main station is a powerful yet user friendly unit that can serve as the heart of a Clear Com system OPERATION INTRODUCTION Congratulations on choosing this Clear Com product Clear Com was established in 1968 and remains the market leader in providing intercoms for entertainment broadcast and industrial applications The ruggedness and high build quality of Clear Com products defines the industry standard In fact many of our original beltpacks and main stations are still in daily use around the world The MS 702 two channel main station is a powerful yet user friendly unit that can serve as the heart of a Clear Com system We recommend that you read through this manual completely to better understand the functions of the MS 702 If you encounter a situation or have a question that this manual does not address contact your dealer or call Clear Com directly at the factory Our applications support and service people are st
8. the following procedure 1 Pull the talk button straight off 2 Insert a small flat blade screwdriver into the slot between the cap and the body of the button and gently twist This will remove the cap 3 Remove the square white diffuser from the cap 4 Inserta 1 2 in 1 27 cm x 1 2 in 1 27 cm square of thin paper with the needed description into the cap Follow it up with the square white diffuser and press the cap onto the body of the button Press the button back into the front panel Call Buttons Each channel has its own call button Pressing a call button will send a call signal on that channel All the call lights on that channel will flash Call signals can also be sent while talking if required The call Clear Com MS 702 Two Channel Main Station Instruction Manual C M ar Com button will flash while the call button is pressed indicating the presence of a call signal on the line Tone Alert An audible tone alert can be enabled to sound when a call signal is received on either channel This can be useful when the operator s attention has been drawn away from the MS 702 indicator panel Press the tone alert button to alternately enable or disable the audible tone alert The button illuminates blue when the audible tone alert is enabled When enabled the tone alert will sound when a call button on a beltpack or station is pressed The tone alert will not sound if a call signal is originated at the MS 702 stati
9. will reset automatically and power will come back up Check for shorts between pins 1 and 2 or improper cable wiring Red short light is illuminated Short or overload on that channel due to a shorted or miswired cable Defective remote station Remove the intercom line cables one at a time from the system until the faulty line is located The red short light will then turn off Check for shorts between pins 1 and 2 or improper cable wiring Once the short is removed the MS 702 will reset automatically and power will come back up Check the remote station and replace if necessary Both red short lights are illuminated System is overloaded Remove the intercom line cables one at a time from the system to help determine where the excess current requirements lie Re evaluate the system current needs Short in multipair cable Remove the intercom line cables one at a time from system until the faulty line is located Check for shorts between pins 1 and 2 or improper cable wiring Problem Hum or buzz in system Inductive pickup caused by close proximity of this main station or connected remote stations to power lines or transformers Relocate the offending unit Clear Com MS 702 Two Channel Main Station Instruction Manual SYMPTOM CAUSE SOLUTION 10 Ohm chassis ground resistor is open Check the DC resistance for 10 Ohms between the chassis and pin 1 o
10. For channel B Move the jumper plug so that it covers pins 2 and 3 This causes call signal activation to interrupt the program audio Clear Com MS 702 Two Channel Main Station Instruction Manual C M ar Com S 702 Two Channel Main Station Instruction Manual In the default position the jumper plug covers pins and 2 which causes talk signal activation rather than call signal activation to interrupt the program audio JP5 for channel A a Talk signals 2 e interrupt 3 program audio JP6 for channelB 1 Call signals 2 interrupt 3 program audio FOR EITHER CHANNEL To interrupt program audio during talk signals place jumper plug over pins 1 and 2 To interrupt program audio during call signals place jumper plug over pins 2 and 3 Figure 4 Changing Program Interrupt Options INSTALLATION 1 Unpack the unit and inspect for any damage that may have occurred in shipping 2 Connect the proper AC mains cable 3 Install the MS 702 Note For additional information refer to the Clear Com System Installation Manual 4 Connect the AC to the mains circuit Note Information on the mains power requirement is given on the underside of the unit Connect the intercom lines Set the two termination switches on the rear panel to on Set the option switches to the default up position PISA Switch power on The blue talk button lights should be on and the two red short lights should b
11. R THIS AGREEMENT FOR ANY INDIRECT SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES INCLUDING WITHOUT LIMITATION LOST PROFITS REGARDLESS OF THE FORM OF ACTION EVEN IF ADVISED IN ADVANCE OF THE POSSIBILITY OF SUCH DAMAGES Assignment Neither party may assign this Agreement or any portion thereof without the prior written consent of the other except in the event of a merger sale of all or substantially all of the assets or other corporate reorganization Ownership of replaced parts or product All replaced parts or products become the property of Clear Com Entire Agreement This Agreement constitutes the entire agreement between the parties with respect to the subject matter hereof and supersedes all prior or contemporaneous proposals oral or written and all other communications between them relating to the subject matter of this Agreement Clear Com Standard Limited Warranty Clear Com Standard Limited Warranty
12. S 702 rear panel are shown in the following figure and briefly described by the text that follows The numbers in the left column refer to Figure 3 AAA O O T O O O n O O mags INTERI HANNEL B kik a 2 CE AT 2 Figure 3 Rear Panel 4 Tone Alert Volume Control This control adjusts the volume of the tone alert sound This is normally adjusted when the system is set up and there should be no need to adjust it in normal operation 15 Option Switches Eight option switches are provided on the rear panel They should be configured when the system is set up but are not changed Clear Com MS 702 Two Channel Main Station Instruction Manual C M ar Com 16 in normal operation The default position of the switches is in the off up position The function of each switch is as follows 1 MOM TALK A Setting the momentary talk A switch to the on position will disable the latching function of the channel A talk button In this mode the ta k button must always be held in continuously while the operator is talking on channel A 2 MOM TALK B Setting the momentary talk B switch to the on position will disable the latching function of the channel B talk button In this mode the talk button must always be held in continuously while the operator is talking on channel B 3 CALL ON TALK A If the call on talk A switch is set to the on position a call signal will be placed on channel A whenever the talk function is activ
13. To turn the feature off place the jumper plug over pins 1 and 2 7 Replace the cover of the RM 702 S 702 Two Channel Main Station Instruction Manual 11 8 Connect the unit to AC mains electricity RE SETTING PROGRAM INTERRUPT OPTIONS When you set one of the front panel Program ON OFF INTRPT switches to the INTRPT position any talk signal activated on that channel interrupts the program audio during the talk signal You can change this option so that activating a call signal rather than a talk signal interrupts the program audio for the duration of the signal You do this by re setting an internal jumper on the station s internal circuit board To re set the program interrupt option 1 Please observe anti static procedures Static electricity can damage a circuit card Please ground yourself and tools before touching the circuit card Remove the cover of the MS 702 by removing the eight Phillips screws 3 On the main circuit board locate one of the following For channel A The JP5 three pin jumper located in the center of the circuit board For channel B The JP6 three pin jumper located in the center of the circuit board 4 A jumper plug covers two of the three pins on each jumper To change the program interrupt option on your station do one of the following For channel A Move the jumper plug so that it covers pins 2 and 3 This causes call signal activation to interrupt the program audio
14. adset and speaker It also accepts Clear Com gooseneck panel microphones The integral speaker can be turned on or off by a convenient front panel switch An automatic speaker dipping circuit will lower the level of the Clear Com MS 702 Two Channel Main Station Instruction Manual C M ar Com speaker when the announce button talk buttons or program interrupt are activated This feature helps minimize feedback The MS 702 also incorporates a dual channel program interrupt system IFB When activated one or more stations can interrupt the program audio to either another intercom station or a talent wearing Clear Com s wired or wireless talent receivers Clear Com s stand alone IFB system can also be connected to this station The MS 702 provides 30 volt DC power to operate Clear Com beltpacks and remote stations This power is distributed between the two channels and will support up to 60 headset stations or 20 speaker stations Clear Com s fail safe design automatically shuts down the power to a channel when a short circuit or electronic overload is sensed on that channel The other channel will continue to operate normally Once the fault condition is removed the MS 702 s fail safe circuit will restore power even under full load conditions LED indicators signal a short or overload on either channel The DC power output details are 1 2A continuous output 2A peak output not exceeding the 1 2A rating for more t
15. anding by to assist you Refer to Chapter 5 Warranty for contact information Thank you for selecting Clear Com for your communications needs DESCRIPTION The Clear Com MS 702 is a two channel one rack space main station ideal for ENG and EFP trucks production studio consoles theatre live performances and small TV facilities It features excellent speech intelligibility in all noise levels and can be tailored to your needs through its programmable options Selectable two channel talking and or listening allows the operator to communicate on either of the intercom channels separately or on both at once The illuminated dual action talk buttons provide electronic momentary or latching capability Monitoring can be done through the headset the integral speaker or both at once The MS 702 offers both visual and audible call signaling to attract the attention of operators who have removed their headsets or turned off their speakers The remote mic kill RMK feature provides the ability to turn off all open mics on remote beltpacks The MS 702 can control a paging speaker for studio announcements A front panel button activates both this function and an associated relay A balanced program input allows monitoring of external audio using the headset or speaker This main station accepts dynamic headsets Individual sidetone controls for each intercom channel allow the operator to vary the level of his her own voice as heard in the he
16. annel A may require some readjustment Speaker ON OFF Switch The speaker on off switch turns the front panel speaker on or off This switch does not affect whether the tone alert is heard through the speaker The speaker volume will automatically dip whenever the panel or headset microphone is on Remote Mic Kill Switch The remote mic kill RMK switch will turn off the talk function of every beltpack on channels A and B If the talk functions of a large number of beltpacks have inadvertently been left activated incidental noise and talking can make it difficult or impossible to communicate on the party line intercom The RMK switch can be Clear Com MS 702 Two Channel Main Station Instruction Manual C M ar Com 12 13 14 18 pressed to quiet the line in this situation Those needing to communicate can then set their talk functions to on as needed Note The RMK switch can only function if the MS 702 main station is powering all of the stations in the system The switch momentarily interrupts power to the other beltpacks and stations in the system If there are other power supplies or main stations in the system then the RMK switch cannot interrupt power and therefore cannot work Mic Select Switch Set the mic select switch to select whether the panel microphone or the headset microphone is active Panel Mic Gain This control is located on the inside of the MS 702 chassis It may be used to increase or decr
17. ate normally or has been dropped WARNING To reduce the risk of fire or electric shock do not expose this product to rain or moisture Please familiarize yourself with the safety symbols in Figure 1 When you see these symbols on this product they warn you of the potential danger of electric shock if the unit is used improperly They also refer you to important operating and maintenance instructions in the manual Clear Com MS 702 Two Channel Main Station Instruction Manual CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN This symbol alerts you to the presence of uninsulated dangerous voltage within the product s enclosure that might be of sufficient magnitude to constitute a risk of electric shock Do not open the product s case This symbol informs you that important operating and main tenance instructions are included in the literature accompanying this product Figure 1 Safety Symbols EMC AND SAFETY The MS 702 meets all relevant CE FCC UL and CSA specifications set out below EN55103 1 Electromagnetic compatibility Product family standard for audio video audio visual and entertainment lighting control apparatus for professional use Part 1 Emissions EN55103 2 Electromagnetic compatibility Product family standard for audio video audio visual and entertainment lighting control apparatus for professional use Part 2 Immunity UL 60065 7 CAN CSA C22 2 No 60065 3 IEC 60065 7 Safety
18. ated This can be used to activate any call activated functions available on other stations 4 CALL ON TALK B If the call on talk B switch is set to the on position a call signal will be placed on channel B whenever the talk function is activated This can be used to activate any call activated functions available on other stations 5 INTRPT ANNC If the interrupt announce switch is set to the on position pressing the announce button will disconnect the microphone from the intercom line s This will allow announcements to be made without being heard over the intercom channels 6 INTRPT EXT IFB When the hot mic output is connected to Clear Com s IFB system and the interrupt external IFB switch is set to the on position pressing a key on the IFB system will disconnect the selected headset or panel microphone from the intercom line s This allows the MS 702 microphone to be used to cue talent without affecting intercom line communication 7 LONG LINE A Ifa long cable run on channel A is unavoidable and approaches 1 000 ft 305 m or more set the ong line A option switch to the on position The ability to set a sidetone null on channel A depends upon properly setting this switch 8 LONG LINE B Ifa long cable run on channel B is unavoidable and approaches 1 000 ft 305 m or more set the ong line B option switch to the on position The ability to set a sidetone null on channel B depends upon properly setting this switch T
19. e DC loading of intercom line Remove any audio transformers or other equipment that may be connected across the intercom line If equipment other than Clear Com intercom equipment must be connected to the intercom line please contact Clear Com application or service personnel for advice lear Com Cc MS 702 Two Channel Main Station Instruction Manual SYMPTOM CAUSE SOLUTION Far too many terminations on the intercom line Check all main stations and power supplies to make sure each intercom channel is terminated at only one point Table 3 1 Troubleshooting Tips Clear Com MS 702 Two Channel Main Station Instruction Manual C M ar Com SPECIFICATIONS dBv is an absolute measurement 0 dBv is referenced to 0 775 V RMS Headset Microphone Pre Amp Input Type Dynamic Impedance 1KQ Input Level 55 dBV nominal 10 dBV max Frequency Response 200 Hz to 15 kHz Gain from headset mic to intercom line 41 dB Panel Microphone Pre Amp Input Type Electret Input Level 45 dBV nominal Frequency Response 450 Hz to 12 kHz Gain from panel mic to intercom line 31 dB Headphone Speaker Amplifier Load Impedance Range 500 2 KQ Output Level At least 20 dBV across 6000 Distortion lt 0 2 THD 1 KHz Frequency Response 200 Hz 18 KHz 2 dB Gain from intercom line 37 dB Power Output 110 dB SPL Program Amplifier Transformerless balanced differential
20. e Generator Level B Main Power A 3 Pgm amp 03 30VDO j So SA Main Main Output 3 Channel A Pgm TT Pgm 2 Power 91 XLRs 3 20 Control uP L On Off o Hot Mic 30VDC Q Power B 30VDC IFB Out 2 Lr T Switching T Channel B U Power svpc 1 XLRs 3 IEC Power Supply 2 Inlet Intercom A Intercom Lines B Line Linking amp Option Switches Anne Rly Termination 00 0 0 0 0 0 0 aon AA Control Front Panel 2 Ji gt Ex To All Call Alert Switches pes suine Tone RMK Link Buttons amp Gal Indicators System Logic Signal A Intercom gt Send amp B Lines Receive Clear Com M Figure 3 6 Block diagram of the MS 702 S 702 Two Channel Main Station Instruction Manual TROUBLESHOOTING TIPS SYMPTOM CAUSE SOLUTION System does not operate Blue talk buttons do not illuminate and short lights do not illuminate No AC power to the MS 702 Make sure the power switch on the rear panel is turned on Check the AC connection and cable Plug into a dependable AC source The MS 702 has an internal power supply failure Unit requires servicing System does not operate when power switch is turned on Blue talk lights and red short lights wink Direct short on the intercom channel indicated by the red short light Remove the intercom line cables one at a time from that channel until the faulty line is located Once the short is removed the MS 702
21. e front panel of the MS 702 To install a GM 9 or GM 18 microphone use the following steps S 702 Two Channel Main Station Instruction Manual 1 Check and unscrew the set screw in the mic mounting flange to make sure it is clear of the threads in the bushing 2 Screw the microphone into the bushing hand tight 3 Turn the set screw on top of the mic mounting flange clockwise to lock the microphone in place 19 Headset Connector The headset connector is located on the front panel All Clear Com headsets are recommended for use with the MS 702 The following is a description of the characteristics of a suitable headset Mic Type Dynamic 150 to 250 ohms impedance 55 dB output level Headphone Dynamic 50 to 2000 ohms impedance The wiring of the headset is to be as follows Pin 1 Mic common Pin 2 Mic hot Pin 3 Headphone common Pin 4 Headphone hot The mic and headphone wiring in the headset cord must be individually shielded Do not connect pins 1 and 3 together Headset extension cords or headset Y cables are not recommended because they will increase crosstalk between channels 26 Short Lights There is one red light for channel A and one for channel B These lights illuminate when the MS 702 senses a short or overload on the associated channel When the fault is removed the MS 702 will automatically reset and the light will go out REAR PANEL The controls and connectors found on the M
22. e off 9 Set listen levels and sidetones Refer to the listen level and sidetone setting topics in the Operation sec tion of this manual 10 The intercom system should now be operating properly Read the rest of this manual for further information Clear Com MS 702 Two Channel Main Station Instruction Manual C M lear Com S 702 Two Channel Main Station Instruction Manual MAINTENANCE INTRODUCTION This chapter provides maintenance information including a block diagram and troubleshooting tips Caution These servicing instructions are for use by qualified personnel only To reduce the risk of electrical shock do not perform any servicing other than that contained in the operating instructions unless you are qualified to do so MS 702 BLOCK DIAGRAM The following is a block diagram of the MS 702 MS 702 Headset Mic XLR4 Main A j Headset Pgm 1 XLR4 Mic pale Program Limiter Line a i Length ET Panel f Sidetone Mi Headset ck Na Limiter Jack Se Panel Mic Gain Z Listen Main A A Spkr Pgm On Off Intercom Program Line A Mute Level A Line Length PFT Sidetone Null Alert Tone Level Listen Main A 5 Pgm Intercom P Program DERE
23. ease the volume of the panel microphone It has no effect on the sensitivity of the headset microphone To adjust the panel microphone gain remove the top cover of the MS 702 Locate the R161 jumper which is located on the leftmost side of the circuit board toward the front of the MS 702 when facing it Use a small screwdriver to turn the control clockwise to increase sensitivity or counterclockwise to decrease sensitivity Gain Adjust Figure 2 Gain Adjust Control R161 Announce Press the announce button to make stage or PA system announcements It directs the audio from the selected headset or panel microphone to the annc out rear panel connector and activates the announce relay Simultaneously if the program audio feed to the announce output is enabled it is interrupted by the announcement Program audio feed to the announce output is selected by setting jumper JP2 on the main board to the on position Optionally pressing the announce button can also disconnect the selected headset or panel microphone audio from the intercom line s This option is controlled by the interrupt announce option switch Panel Mic Connector Clear Com recommends the GM 9 and GM 18 plug in panel microphones for use with the MS 702 The GM 9 is 9 in 22 86 cm long and the GM 18 is 18 in 45 72 cm long The microphone is an electret type The 1 4 in 0 64 cm phone jack on the microphone mates with the panel mic receptacle on th
24. ermination Switches These switches provide switchable terminations for channels A and B In most systems both terminations on the MS 702 should be in the on position default setting The fundamental concept of the Clear Com party line intercom is that all channels are terminated in one location preferably at a main station or power supply The termination switches on the MS 702 rear panel should be set to the off position only if the channel is terminated by another main station or power supply in the system If there are no other main stations power supplies or other terminations on the line set the rear panel switches labeled term A and term B to the on position Note All intercom lines must be terminated only once whether they are used or not Never double terminate a line S 702 Two Channel Main Station Instruction Manual 17 20 21 22 23 Power Switch The power switch can be used to turn AC power to the MS 702 on and off When in the on position the front panel talk buttons illuminate blue AC Power Connection An IEC type 320 connector is provided to interface to the appropriate AC power cord to be used Voltages from 90 to 240 VAC at 50 or 60 Hz are acceptable The MS 702 will automatically adjust for the power applied so there are no manual switches to set power line voltage or frequency Intercom Line Connection The MS 702 contains three 3 pin male XLR connectors for each intercom line These connec
25. f any intercom connector If this condition occurs it is because the system ground came into contact with something that was HOT with respect to the power supply earth ground Carefully check the system ground and AC distribution in the area Warning This is a potentially dangerous situation A shock hazard may exist between a remote station headset and ground System feedback Acoustical Listen level control at this station or a remote station is set too high Adjust Sidetone null control at this station or a remote station is not adjusted correctly Adjust Refer to the procedure in the front panel section of this manual Channel unterminated Set the MS 702 termination switch for that channel to the on position A headset extension cord was used Headset extension cords are not recommended Excessive crosstalk High DC resistance in ground return Use heavier cable add additional conductor s to ground return Multi channel cable pairs are not individually shielded Replace cable with individually shielded pairs Headset cables are not wired properly or shielded properly Correct wiring Use headsets with properly shielded wiring Program signal sounds distorted Overload of program input circuit Reduce program input level or reduce the gain of the program signal at the source such as an audio mixer Call signals do not function Excessiv
26. han 2 seconds per 30 second period 1 75A max on any channel with electronic current limiter not exceeding the 1 2A rating for more than 2 seconds per 30 second period The MS 702 will operate from any AC line voltage between 90 and 240 volts AC at 50 or 60 Hz The MS 702 installs in a standard 19 inch 48 26 cm equipment rack using only one rack space The steel chassis and extra thick front panel with integral rack ears maintains legendary Clear Com ruggedness Three 3 pin XLR connectors are provided for connection to each intercom channel The MS 702 is compatible with all Clear Com party line intercoms OPERATION Normal operation of the MS 702 main station requires access only to the front panel controls The controls located elsewhere on the unit are intended to be set and forget in nature For intercom operation set the listen level controls for each channel to the desired level and press the talk buttons when talking If a headset is used set the sidetone control for each channel for the desired amount of sidetone in the earphone If using the panel mic and speaker set the sidetone controls for minimum feed through to the speaker to prevent feedback FRONT PANEL The controls indicators and connectors found on the MS 702 front panel are shown in the following figure and are described the text that follows The numbers in the left column refer to Figure 1 S 702 Two Channel Main Station Instruction Manual Figure
27. hipped from Clear Com to the Customer The Standard Warranty Period start date for contracts that include commissioning will be the date of the Site Acceptance Test SAT or one month from conclusion of the commissioning project whichever is earlier f Invalidation of Warranty i This Limited Warranty shall be invalidated if the product s outer case has been opened and internal modifications have been made or damage has occurred or upon the occurrence of other damage or failure not attributable to normal wear and tear Authorized modifications with Clear Com s express written permission will not invalidate the warranty g Software Updates i Software Updates are released periodically to correct discovered program bugs During the Warranty Period software updates are available to Customers free of charge Clear Com ii Standard Limited Warranty 2 h Software Upgrades i Software Upgrades include new Features and or Functional Enhancements and are not included as part of the Standard Warranty but may be purchased at the published rates ii Note In the absence of a Software Update containing a program correction and no available workaround to mitigate the problem at the discretion of Service Sales Engineering or Product Management the Customer may be provided a Software Upgrade under warranty Exclusions Services do not cover damage or failure caused by any occurrence beyond Clear Com s reasonable control including with
28. on The level can be adjusted by the control on the rear panel See number 4 on the rear panel diagram later in this chapter Listen Level Controls Each channel has a separate listen level control Turn these controls to set the listen level you need on each channel Turn the control completely counterclockwise to silence a channel Sidetone Controls Each channel has a sidetone null control Sidetone is the level of your own voice that you hear while talking on the intercom Setting a comfortable level of sidetone will ensure that the intercom line sounds alive and also helps you modulate your voice relative to other voices on the line Typically different sidetone null settings are needed depending upon whether you are using the gooseneck panel microphone along with the speaker Use one of the following procedures to correctly set the sidetone level controls Sidetone Adjustment Procedure for Gooseneck Microphone with Speaker turned on 1 Turn off the party line link A B switch 2 Turn the level control for channel B all the way down Set the level control for channel A to a comfortable level 3 Press the channel A talk button and speak into the microphone while turning the sidetone null control for channel A slowly back and forth There should be a point where your voice and any accompanying acoustic feedback disappears This is the null point 4 Repeat this procedure for channel B by turning the channel A evel control do
29. ontrols Adjust the program level controls to set the program audio level heard on the intercom There are three program level controls The program level knob to the left of the speaker on off switch adjusts the level of program heard in the headset or panel speaker The program levels heard on each intercom channel line can be individu ally adjusted but this is intended to be a one time setting made when the MS 702 is set up This is done using the screwdriver level adjustment trimpots adjacent to the program on off intrpt switches on channels A and B Set the sidetone null controls and the program level knob fully counter clockwise when adjusting the individual channel program level trimpots After the program level trimpots are properly adjusted use the procedure listed in the Sidetone Controls section on this page to set the sidetone level Note Do not force the trimpots past their stop points This will damage them Party line Link A B Switch When pressed the party line link A B button combines both intercom channels into one for example for rehearsals The party line link button illuminates amber when on and all of the stations on the B channel will be moved onto the A intercom line This will allow communication between everyone on both channels at once In this mode the channel B controls and switches will be inactive Since the wiring for the B channel has been now added to the A channel the sidetone null control for ch
30. out limitation acts of God fire flooding earthquake lightning failure of electric power or air conditioning neglect misuse improper operation war government regulations supply shortages riots sabotage terrorism unauthorized modifications or repair strikes labor disputes or any product failure that Clear Com determines is not a result of failure in the Services provided by Clear Com Further Services excluded from this Agreement include services required due to errors or omissions in Customer purchase orders installation or maintenance of wiring circuits electrical conduits or devices external to the products replacement or reconditioning of products which in Clear Com s opinion cannot be reliably maintained or properly serviced due to excessive wear or deterioration Customer s failure to maintain the installation site in accordance with the environmental specifications of the products or service on products removed from the location originally specified by Customer and or reinstalled without the prior written approval of Clear Com Customer will pay Clear Com s then current published charges to restore such Covered Products to a condition eligible for further service under this Agreement Clear Com shall be excused from and shall not be liable for any failure or delay in performance under this Agreement due to the foregoing or any causes beyond its reasonable control Limitation of Liability INNO EVENT WILL CLEAR COM BE LIABLE UNDE
31. ted Warranty Clear Com warrants its products including supplied accessories against defects in material or workmanship for the time periods as set forth below provided it was purchased from an authorized Clear Com dealer or distributor a Pursuant to this Limited Warranty Clear Com will at its option i repair the product using new or refurbished parts or ii replace the product with a new or refurbished product b Remedies In the event of a defect the rights detailed in 1 a are your exclusive remedies For purposes of this Limited Warranty refurbished means a product or part that has been returned to its original specifications c Standard Warranty Period by Product i All Clear Com brand systems and products including belt packs have a Limited Warranty of two years with the exception of 1 Cables accessories components amp consumable items have a Limited Warranty of 90 days 2 Any Clear Com product that has been classified as obsolete at the time of sale has a Limited Warranty of 90 days from sales and will be replaced with the same product or a sales credit will be issued at the sole discretion of Clear Com 3 Headsets handsets microphones and associated spare parts as well as UHF wireless IFB products have a Limited Warranty of one year 4 UHF WBS Analog wireless intercom systems have a Limited Warranty of three years Clear Com Standard Limited Warranty 5 All software products incl
32. ther room The contacts are rated for 2 0 A at 24 VDC The contacts are wired as follows Ring Normally closed contact Tip Common contact Sleeve Normally open contact Hot Mic Out IFB System This connection is a 1 4 in 0 64 cm phone jack It provides a 0 dBV output signal from the selected headset or panel microphone This output is intended interface with the external line in jack on Clear Com s IFB System The jack is wired as follows Ring Ext IFB control signal input Tip Hot mic audio output Sleeve Ground shield 27 Headset Audio Limiter To protect the hearing of the user the headset audio limiter restricts the maximum audio level heard in the headset The MS 702 unit is shipped with the headset audio limiter on You can turn this feature on or off by using a jumper located on the main circuit board To turn the audio limiter on or off 1 Please observe anti static procedures Circuit cards can be damaged by static electricity Please ground yourself and tools before touching any circuit cards 2 Disconnect the unit from AC mains electricity Remove the cover of the RM 702 Locate the three pin jumper labeled J3 on the center frontmost portion of the circuit card A jumper plug is located over pins 2 and 3 This is the on setting Do one the following to turn the audio headset limiter feature on or off To turn the feature on place the jumper plug over pins 2 and 3 e
33. tors are wired in parallel Any single channel station or channel of a multi channel station connected on a line plugged into channel A of the MS 702 will be party lined with all the other stations on that channel In a multi channel system the goal is to assign specific people to the correct group i e the other people they need to be in contact with the most This is particularly important when the party line users are on a single channel beltpack or station less so if they are on multi channel stations The pinout of the intercom connectors is as follows Pin 1 Ground shield Pin 2 Power 30 VDC Pin 3 Audio Program Input A 3 pin XLR female connector provides the main program input to the station Program can be fed to the headphone or speaker as well as to either or both of the intercom channels The level to the speaker or headphone is controlled by the program level control The program on off intrpt switches control whether each intercom channel receives program audio The program audio levels on each intercom channel can be adjusted using the individual program level trimpots The program input accepts a balanced or unbalanced line level audio signal from 20 dBv to 10 dBv An option is to feed program audio to the announce output This is selected by setting jumper JP2 on the main board to the on position When this option is selected a O dBv signal on the program input will produce a 0dBv signal on the announce o
34. uding Concert Client and Server ECS Production Maestro and Logic Maestro are warranted for one year and shall substantially conform to published specifications The media on which the Software is furnished is warranted to be free of defects in material and workmanship under normal use for a period of one year 6 Any Clear Com products that are listed within the last time buy period have the same Limited Warranty for their type 1 i 1 1 1 5 as above d Any Clear Com product that is repaired or supplied as a replacement under the terms of this Limited Warranty shall inherit the remaining warranty period from the original product e Standard Warranty Period Start Date i Dealer Distributor Sales In view of Dealer or Distributor stocking practices the Standard Warranty Period for products sold through Dealers or Distributors will commence from the Clear Com invoice date and will include an automatic extension of three months Any valid warranty claim within the Standard Warranty Period as determined by the Clear Com invoice date will be covered without further supporting evidence All warranty claims after this date must be supported by the Customer s proof of purchase that demonstrates the product is still within the Standard Warranty Period as detailed in Section 1 c i above plus the automatic three month extension from their purchase date ii Direct Sales The Standard Warranty Period will commence from the date the product was s
35. utput The pinout of the program input connector is as follows Pin 1 Ground shield Pin 2 Signal Pin 3 Signal Announce Out A 3 pin XLR male connector is provided as a feed to a studio PA amplifier Pressing the announce button on the front panel places the audio from the selected headset or panel microphone on the annc out rear panel connector Optionally pressing the announce button can also disconnect the selected headset or panel microphone from the intercom line s This option is controlled by the interrupt announce option switch Simultaneously if the program audio feed to the announce output is enabled it is interrupted by the announcement Program audio feed to the announce output is selected by setting jumper JP2 on the main board to the on position The pinout of the announce out connector is as follows Clear Com MS 702 Two Channel Main Station Instruction Manual C M ar Com 24 25 Pin 1 Ground shield Pin 2 Signal Pin 3 Signal The audio output is balanced and transformer isolated It has a 600 ohm impedance and a nominal output level of 0 dBV A shielded twisted pair cable should be used in the cable wired to this connector Relay Out A dry set of relay contacts is provided through a 1 4 in 0 64 cm jack to activate external switching as needed when the announce button is pressed These contacts can be used to control an external device such as a PA amplifier to ano
36. wn and adjusting the channel B controls Sidetone Adjustment Procedure for Headset 1 Turn off the party line link A B switch 2 Turn the level control for channel B all the way down Set the level control for channel A to a comfortable level by having someone talk to you from another station 3 Press the channel A talk button and speak into the microphone while turning the sidetone null control for channel A slowly back and forth until you hear your voice at a comfortable level in the headset 4 Repeat this procedure for channel B by turning the channel A evel control down and adjusting the channel B controls S 702 Two Channel Main Station Instruction Manual 10 11 Program ON OFF INTRPT Switches The program on off intrpt switches are used to manually or automatically control program audio feed into the intercom lines The settings are as follows ON The channel will receive program audio when the switch is set to on The audio level for each channel can be adjusted with the program level trimpots OFF The channel will not receive program audio when the switch is set to off INTRPT Pressing the talk button will interrupt the program when this switch is set to intrpt Note You can set this feature so the pressing the cal button for a channel rather than the talk button interrupts the program audio See the section Resetting Program Interrupt Options at the end of this chapter Program Level C
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