CLEAR-COM ENCORE MS-704 RM-704 FOUR-CHANNEL MAIN STATION FOUR-CHANNEL REMOTE STATION INSTRUCTION MANUAL
MS-704/RM-704 Four-Channel Main/Remote Stations Instruction Manual © 2007 Vitec Group Communications All Rights Reserved Part Number 810345Z Rev. 2 Vitec Group Communications, LLC 850 Marina Village Parkway Alameda, CA 94501 U.S.A Vitec Group Communications 7400 Beach Drive Cambridge Research Park Cambridgeshire United Kingdom CB25 9TP Vitec Group Communications Room 1806, Hua Bin Building No. 8 Yong An Dong Li Jian Guo Men Wai Ave Chao Yang District Beijing, P.R.
CONTENTS OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 The Clear-Com Concept. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 Understanding the MS-704/RM-704 Main and Remote Stations . . . . . . . . . 1-2 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Internal Option Jumpers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12 IFB Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12 Run/Test Mode Jumper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12 Program Audio Feed to Announce Output Jumper . . . . . . . . . . . . . . . 2-12 MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 Introduction . . . . . . . . . . . .
IMPORTANT SAFETY INSTRUCTIONS 1. 2. 3. 4. 5. 6. 7. Please read and follow these instructions before operating this product. 8. 9. 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. Do not block any ventilation openings. Install in accordance with the manufacturer’s instructions.
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 maintenance instructions are included in the literature accompanying this product.
1 Clear-Com manufactures a wide variety of both portable and fixed installation units. All are compatible with each other. 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, educational, broadcast and industrial applications. The ruggedness and high build-quality of Clear-Com products defines the industry standard.
Clear-Com main stations, power supplies and certain remote stations each have an auxiliary program input with its own volume control, which allows an external audio source to be fed to the intercom system. Visual signal circuitry (call lights), a standard feature on all main and remote stations, allows the user to attract the attention of operators who have removed their headsets.
The MS-704 is a four-channel main station that contains a no-fail system power supply. The RM-704 is a four-channel remote station intended to be powered from the intercom line. The following is a list of features found in the MS-704 and RM-704 intercom stations: • MICROPROCESSOR CONTROL: Most aspects of station operation are under microprocessor control. • REMOVABLE ACCESS PANEL: A removable access panel allows access to most controls and option DIP switches.
• SPEAKER ON/OFF SWITCH: The speaker may be turned on and off with a front panel switch. • SPEAKER DIMMING: Whenever a talk is active, the speaker output is dimmed approximately 6 dB to prevent feedback. • PANEL MIC GAIN: The preamplifier for the panel microphone has a gain trim adjustment to allow field trimming. Adjustment of the panel microphone gain also varies the frequency response of the preamplifier to compensate for feedback when the microphone is used up close.
• The announce function Intercom Power Status Lights (MS-704) The four red short lights are failure indicators for each of the four intercom lines. These lights will assist in locating a shorted or overloaded channel. Within as little as ½ second of automatically cutting off power to an overloaded intercom line, the MS-704 will attempt to turn power on again. This allows momentary short or overload conditions to clear automatically. Shorts are normally caused by miswiring or damaged cables.
The button will be illuminated blue when the talk function is off and amber when the talk function is on. Another option allows the automatic setting of a listen function whenever a talk is active (auto-listen DIP switch) for each channel. The All-Talk Function Pressing the button marked all talk sends the selected microphone to all channels while the button is pressed (momentary only). This button lights amber when pressed.
beltpacks have inadvertently been left activated, incidental noise and talking can make it difficult or impossible to communicate on the party line intercom. The remote mic kill button can be pressed to quiet the line in this situation. Those needing to communicate can then set their talk functions to on as needed. Note: The remote mic kill button only functions if the MS-704 main station is powering all of the stations in the system.
• LINE LENGTH: Four DIP switches (one for each channel) allow the optimization of the nulling circuitry for each channel. The default (up position) is for lines less than 400 ft. (122 m). The down position is for lines longer than 400 ft. (122 m). Hidden Adjustment Controls Various adjustments are available beneath the front access panel. • PANEL MIC GAIN: This control trims the panel microphone preamplifier gain to compensate for different uses of the station.
2. The auxiliary input connector has four individual program inputs for each channel. These inputs cannot be disabled with front-panel DIP switches. REAR PANEL OPTIONS This section describes the switches on the rear panel. These switches and controls are usually set and not used in daily operation of the unit. INTERCOM LINE TERMINATION (MS-704) The MS-704 has switch-selectable intercom line termination networks. The RM-704 is a remote station and therefore does not have terminating networks available.
SUMMARY OF FRONT-PANEL LIGHTS Table 1 summarizes the meaning of various front-panel key colors.
2 INSTALLATION This chapter discusses how to install the MS-704 and RM-704 intercom stations in an intercom system. INSTALLATION OVERVIEW This section describes the Clear-Com concept of intercom line interconnection. The following subjects are discussed: • Intercom line connection • Line termination • Station powering • Cable considerations Intercom Line Connection The MS-704 provides two male XLR-3 connectors for each intercom line.
FAIL-SAFE POWER An intercom power supply has special needs that are not met by traditionally designed power supplies. An intercom power supply must work in adverse conditions such as low AC line voltage, momentary shorts on the DC power lines to the stations, and excessive peak loads during “power-on”conditions. The following features are incorporated into the MS-704’s power supply: • AUTOMATIC SHORT CIRCUIT PROTECTION: The MS-704’s internal power supply checks each channel for a short or current overload.
2 amperes. A short on any one intercom line will not bring the whole system down. Note: Power supply lines connected together at remote stations will disable the individual channel short circuit protection feature. • FRONT PANEL “SHORT” LIGHTS: There are four short lights on the front panel (one for each channel). The short lights illuminate steadily when an overload or short condition is detected. They blink if power to a channel has been shut off as a result of an overload or short.
FAIL SAFE POWER DISTRIBUTION SCHEME WITH SINGLE-CHANNEL REMOTE STATIONS MS-704 Main Station 2 Amp Power Supply R BELT PACK BELT PACK BELT PACK BELT PACK BELT PACK BELT PACK BELT PACK BELT PACK Ch A Ch B R Ch C Ch D THE 4 POWER LINES ARE NOT CONNECTED Wall Station Wall Station Wall Station Wall Station Wall Station Wall Station Wall Station Wall Station R R +30 Volts for each Intercom Line Figure 2-5: Stations Powered by Individual Channels The illustration above shows the proper po
J16 1 2 3 4 5 6 Placing jumper plug over pins 1 and 2 connects channels A and B Placing jumper plug over pins 3 and 4 connects channels B and C Placing jumper plug over pins 5 and 6 connects channels C and D Figure 2-6: J16 Six-Pin Jumper 5. Continue placing pins until all desired channels are connected. 6. Replace the cover of the RM-704.
will assist in locating the shorted or overloaded channel. Shorts are generally caused by miswiring or damaged cables. Overloads are generally caused by connecting too many beltpacks and stations to a channel. The current requirements of Clear-Com remote stations and beltpacks vary with model and use. A station that is simply on and idling in the circuit may draw only a small amount of current. The MS-704 provides DC power to operate Clear-Com beltpacks and remote stations.
GROUND ISOLATION The pin #1 ground connection of each XLR connector must also be isolated from the chassis. Pin #1 should not be connected to the shell of the XLR connector. Figure 2-8: Interconnect Cable Detail Note: The remote stations connected to each channel are powered from the intercom cable for that channel. In the case above, a short on any one line will only take that channel down.
CHANNEL A CHANNEL B CHANNEL C CHANNEL D PROGRAM IN AUX HOT MIC/IFB RM-704 ANNOUNCE OUT Class 2 Wiring RM-704 On On Off Off CHANNEL B CHANNEL A Term On On Off Off PROGRAM IN WARNING: MS-704 TO PREVENT FIRE OR SHOCK HAZARD DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE. HOT MIC/IFB AUX CAUTION: TO PREVENT ELECTRIC SHOCK DO NOT REMOVE COVER. NO USER SERVICEABLE PARTS INSIDE. REFER TO QUALIFIED SERVICE PERSONNEL. CHANNEL C CHANNEL D ANNOUNCE OUT Output: 30V 1.
long. The microphone is of the electret type. The microphone has a built-in ¼ in. (0.64 cm) phone jack for a connector. A proprietary mating receptacle is mounted on the station. To install a GM-9 or GM-18 panel mount microphone, use the following steps: 1. Check 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. If desired, set the set screw on top of the bushing to lock the mic in place.
ANNOUNCE OUTPUT (REAR PANEL) An XLR-3M connector provides the announce output from the station. Whenever the announce button on the front panel is pressed, the selected microphone is sent to the announce output and the announce relay is activated. 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 J11 on the main board to the on position.
Figure 2-10: Accessory Connector • AUXILIARY PROGRAM INPUTS: Four different program inputs, one for each channel, are provided. These auxiliary program inputs can only be fed directly to their associated intercom line. The only controls that affect these inputs are the PGM-level controls associated with each channel and the internal program interrupt switch that is active if the function has been activated with an option DIP switch and a talk is active on that channel.
INTERNAL OPTION JUMPERS There are several jumper options inside the chassis of the MS-704 and RM-704. CAUTION: Remove AC power from the unit before removing the top cover. The following options are available: • IFB operation mode select • Run/test mode jumper • Program audio feed to announce output IFB Mode The MS-704 and RM-704 support two different modes of operation for the internally generated IFB function.
3 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.
RM-704 BLOCK DIAGRAM Figure 3-12: RM-704 Block Diagram 3-2 MS-704/RM-704 FOUR-CHANNEL MAIN/REMOTE STATIONS
4 TECHNICAL SPECIFICATIONS MS-704/RM-704 FOUR-CHANNEL STATIONS dBu is an absolute measurement. 0 dBu is referenced to 0.
IFB/Hot Mic Type Output Impedance Load Impedance Frequency Response Panel Mic - Party Line Headset Mic - Party Line Headset Mic - Line Out Program Input - Party Line Program Input - Headset Out Program Input - Speaker Out Party Line - Headset Out Party Line - Speaker Out Max Distortion Panel Mic - Party Line Headset Mic - Party Line Headset Mic - Line Out Program Input - Party Line Program Input - Headset Out Program Input - Speaker Out Party Line - Headset Out Party Line - Speaker Out Noise Panel Mi
Mains Power (MS-704) Input Voltage Range Input Frequency Range Input Power Output Voltage Output Current per Channel (Continuous) Output Current per Channel (Peak) 100 - 240 VAC 50 - 60 Hz <= 60 VAC 30 VDC ± 0.5V 1.2 A 2 A (Do not exceed the 1.2A rating for more than 2 seconds per 1 minute period) Short Circuit Recovery Time (1st short) <= 0.
(1) All talk button (1) Announce button (1) Party line link button (4) Program ON-OFF-INTERRUPT DIP switches (1) Program level control (4) Listen adjust controls (4) Channel null adjust controls (4) Channel program feed adjust controls (4) Talk buttons (4) Call buttons (4) Listen buttons (1) RMK button (1) Speaker ON-OFF switch (1) Speaker volume control (4) Short LEDs (1) Panel mic gain control (1) Sidetone adjust control (1) Headset audio limiter DIP switch (3) Interrupt enable DIP switches (4) Auto-call
(3) Interrupt enable DIP switches (4) Auto-call DIP switches (4) Auto-talk/listen DIP switches (4) Talk latch disable DIP switches (4) Line length DIP switches Environmental Dimensions (MS-704/RM-704) Weight MS-704 RM-704 32 - 122o F (0 - 50o C) 19 in. W x 3.5 in. H x 10.5 in. D (483 mm x 88 mm x 267 mm) 10.86lbs. (4.94 kg) 10.07lbs. (4.
4-6 MS-704/RM-704 FOUR-CHANNEL MAIN/REMOTE STATIONS
LIMITED WARRANTY Vitec Group Communications (VGC) warrants that at the time of purchase, the equipment supplied complies with any specification in the order confirmation when used under normal conditions, and is free from defects in workmanship and materials during the warranty period. VGC offers 24 x 7 customer support if you have an Extended Warranty or Service Contract. Return Material Authorization (RMA) numbers are required for all returns. Both warranty and non-warranty repairs are available.
such agreement. For more information, contact your authorized dealer, distributor, or sales representative. Instructions for reaching VGC’s User Support Centers are given below. Telephone for Europe, Middle East and Africa: +49 40 6688 4040 Telephone for the Americas and Asia: +1 510 337 6600 Email: vitec.support@AVC.de Once the standard warranty period has expired, the User Support Center will continue to provide telephone support if you have purchased an Extended Warranty or Service Contract.
years the warranty of any product offered with a standard two-year warranty. The total warranty period will not extend beyond five years. Any purchase of an extended warranty provides 24 x 7 customer support in addition to the warranty immediately upon purchase of the warranty extension. Note: VGC does not offer warranty extensions on UHF wireless intercom systems, or on any product with a 1-year or 90-day warranty.
of customer furnished components resulting in damage to VGC provided product. This limited warranty is not transferable and cannot be enforced by anyone other than the original consumer purchaser. This warranty gives you specific legal rights and you may have other rights which vary from country to country.
