Clear-Com MS-704 4-Channel Intercom Main Station User Manual

1. Introduction

The Clear-Com MS-704 is a robust 4-channel headset/speaker main station designed for professional audio communication environments. It features a built-in 2-amp power supply capable of supporting various Clear-Com beltpacks, speaker stations, and headset stations. This manual provides essential information to ensure safe and efficient use of the MS-704.

2. Safety Information

WARNING: To prevent fire or shock hazard, do not expose this equipment to rain or moisture.

CAUTION: To prevent electric shock, do not remove the cover. No user-serviceable parts are inside. Refer all servicing to qualified service personnel.

Always ensure proper ventilation around the unit. Do not block ventilation openings. Use only specified power cables and accessories. Disconnect power before cleaning or servicing.

3. Package Contents

Verify that your package contains the following items:

• Clear-Com MS-704 4-Channel Intercom Main Station
• Power Cable
• User Manual (this document)

4. Product Overview

4.1 Front Panel Controls and Connectors

The front panel provides access to all primary operational controls and headset connections.

Image Description: A full front view of the Clear-Com MS-704 Main Station. It is a black, rack-mountable unit with various buttons, knobs, and jacks. Key features visible include a Panel Mic input, Headset connector, Listen and Talk buttons for four channels (A, B, C, D), a Volume knob, Speaker grille, and various indicator lights and smaller controls for functions like Announce, All Talk, Remote Mic Kill, and Program/Listen Levels.

Image Description: A close-up view of the channel controls on the Clear-Com MS-704 front panel. It shows the illuminated green 'Listen' buttons and blue 'Talk' buttons for Channels B, C, and D, along with the 'Call' buttons below them. The texture of the buttons and the clear labeling are visible.

• Panel Mic: Input for a panel microphone.
• Headset: XLR connector for connecting a headset.
• Channel A/B/C/D Listen Buttons: Green illuminated buttons to monitor audio on specific channels.
• Channel A/B/C/D Talk Buttons: Blue illuminated buttons to speak on specific channels.
• Volume: Rotary knob to adjust the overall speaker/headset volume.
• Announce: Button to activate the announce function.
• All Talk: Button to speak on all channels simultaneously.
• Remote Mic Kill: Button to remotely disable microphones on connected beltpacks.
• Program Level / Listen Level: Rotary controls for adjusting program input and listen levels.

4.2 Rear Panel Connectors

The rear panel provides connections for power, intercom lines, and auxiliary functions.

Image Description: A full rear view of the Clear-Com MS-704 Main Station. It shows the power input with an on/off switch on the left, followed by a 1/4-inch jack labeled 'Hot Mic IFB'. To the right are multiple 3-pin XLR connectors for Channels A, B, C, and D, each with 'On/Off' and 'Term' switches. Further right are 'Program In' (XLR) and 'Auxiliary' (DB-9) connectors, and 'Announce Out' (XLR). Warning labels are also visible.

• Power Input: IEC power connector with an adjacent power switch.
• Channel A/B/C/D (XLR): 3-pin XLR connectors for connecting intercom lines to beltpacks, speaker stations, or other intercom systems. Each channel has 'On/Off' and 'Term' (termination) switches.
• Program In (XLR): Input for external program audio.
• Announce Out (XLR): Output for the announce function.
• Auxiliary (DB-9): Multi-pin connector for auxiliary functions.
• Hot Mic IFB: 1/4-inch jack for IFB (Interruptible Foldback) input.

5. Setup

5.1 Power Connection

1. Ensure the MS-704 power switch on the rear panel is in the 'OFF' position.
2. Connect the provided power cable to the IEC power input on the rear panel.
3. Plug the other end of the power cable into a suitable AC power outlet.

5.2 Connecting Intercom Devices

The MS-704 supports up to 40 RS-701 beltpacks, 10 speaker stations, or 12 headset stations.

1. Connect your Clear-Com beltpacks, speaker stations, or headset stations to the Channel A, B, C, or D XLR connectors on the rear panel using standard 3-pin XLR cables.
2. Ensure the 'On/Off' switch for each connected channel is set to 'On'.
3. If connecting to the end of an intercom line, set the 'Term' switch for that channel to 'On' to properly terminate the line. For mid-line connections, set 'Term' to 'Off'.

5.3 Headset/Panel Mic Connection

1. Connect your headset to the 4-pin XLR 'Headset' connector on the front panel.
2. Alternatively, connect a panel microphone to the 'Panel Mic' jack.

6. Operating Instructions

6.1 Powering On/Off

1. To power on the unit, flip the power switch on the rear panel to the 'ON' position.
2. To power off, flip the power switch to the 'OFF' position.

6.2 Basic Communication

1. Listening: Press the green 'Listen' button for the desired channel (A, B, C, or D) to monitor audio on that channel. The button will illuminate when active.
2. Talking: Press the blue 'Talk' button for the desired channel to speak on that channel. The button will illuminate when active. Release the button to stop talking.
3. Adjusting Volume: Use the 'Volume' knob on the front panel to adjust the overall listening level for the speaker or headset.

6.3 Advanced Functions

• All Talk: Press the 'All Talk' button to communicate simultaneously on all active channels.
• Announce: Press the 'Announce' button to send an announcement through the designated announce output.
• Remote Mic Kill: Press the 'Remote Mic Kill' button to remotely disable the microphones on all connected beltpacks.
• Program Input: Connect an external audio source to the 'Program In' XLR on the rear panel. Adjust the 'Program Level' knob on the front panel to mix this audio into the intercom channels.
• IFB Channels: The MS-704 includes 3 IFB channels. Refer to the full technical manual for detailed configuration and use of IFB.

7. Maintenance

7.1 Cleaning

To clean the unit, disconnect it from power. Use a soft, dry cloth to wipe down the exterior. Do not use liquid cleaners or abrasive materials, as these can damage the finish or internal components.

7.2 General Care

Store the MS-704 in a cool, dry environment away from direct sunlight and extreme temperatures. Avoid dropping or subjecting the unit to severe impacts. Ensure proper ventilation during operation to prevent overheating.

8. Troubleshooting

This section addresses common issues you might encounter with your MS-704.

• No Power:
  • Check that the power cable is securely connected to both the unit and the AC outlet.
  • Ensure the rear panel power switch is in the 'ON' position.
  • Verify that the AC outlet is functional.
• No Audio on a Channel:
  • Ensure the 'Listen' button for the desired channel is pressed and illuminated.
  • Check all cable connections for that channel, including to beltpacks or other stations.
  • Verify that the 'On/Off' switch for the channel on the rear panel is set to 'On'.
  • Adjust the 'Volume' knob on the front panel.
• Cannot Talk on a Channel:
  • Ensure the 'Talk' button for the desired channel is pressed and illuminated.
  • Check your headset or panel microphone connection.
  • Verify that the 'Remote Mic Kill' function is not active.

If problems persist, contact qualified service personnel or Clear-Com support.

9. Specifications

10. Warranty and Support

For detailed warranty information, please refer to the official Clear-Com website or the warranty card included with your product. For technical support or service inquiries, please contact Clear-Com customer service directly.