Clear-Com MR-202 User Manual
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Clear-Com MR-202 User Manual

Clear-Com MR-202 User Manual

Two- and four-channel headset stations
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MR-202/MR-204
TWO- AND FOUR-CHANNEL HEADSET STATIONS

USER MANUAL

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Summary of Contents for Clear-Com MR-202

  • Page 1: User Manual

    MR-202/MR-204 TWO- AND FOUR-CHANNEL HEADSET STATIONS USER MANUAL...
  • Page 2 (MR-202) or four (MR-204) intercom channels. The dual-action talk button operates in electronic momentary or latching mode. The MR-202 and MR-204 offer visual call signaling to attract the attention of operators. The Remote Mic Kill (RMK) feature on main stations will turn off any open microphones on these headset stations.

  • Page 3: Quick Start

    Read the rest of this manual for further information. Operation Normal operation of the MR-202 or MR-204 Headset Station only requires 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 control to the desired level and press the Talk button when talking.

  • Page 4: Front Panel

    Clear-Com Intercom Systems MR-202/MR-204 Two- and Four-Channel Headset Stations Front Panel The controls, indicators, and connectors found on the MR-204 front panel are shown in Figure 1 on page 3 and are described by the following text. The MR- 202 front panel is identical except the channel switch has two positions.
  • Page 5 6—Headset Connector The headset connector is located on the front panel. All Clear-Com headsets are recommended for use with the MR-202 or MR-204. The Clear-Com PT-4 Push-to-Talk Microphone or the HS-6 Telephone Handset will also plug into the headset connector. The following is a description of the characteristics of a suitable headset: •...

  • Page 6: Internal Adjustments And Connections

    Internal Adjustments and Connections The controls and connectors found inside the MR-202 and MR-204 are shown in the following figure and described by the following text. The jumpers can be accessed without completely removing the panel from its wall box by removing the top two screws and loosening the bottom two screws a few turns.
  • Page 7 Talk button must be held in continuously while the operator is talking. 8—Intercom Line Connection The MR-202 contains a five-terminal, plug-on connector for intercom line connection. The MR-204 contains a seven-terminal, plug-on connector for intercom line connection. This connector is intended to be unplugged from the circuit board when connecting the intercom line(s), and then plugged back on when the wiring is completed.
  • Page 8 When the optional 4-Wire or TW Modules are used, both P1 and P3 must be removed. Save these jumper plugs for possible future. Note: The MR-202 and MR-204 will not operate without either these jumper plugs or the optional modules installed.
  • Page 9 MR-202/MR-204 Two- and Four-Channel Headset Stations Clear-Com Intercom Systems Sidetone Intercom Null Volume Headset Headset Output Mute Power Talk Long Line Talk Call TW Option Call Light Call Send & Microprocessor Receive Common Latch +30 VDC Channel Disable Ch. B Switch Ch.

  • Page 10: Troubleshooting

    System does not operate. Talk Light does not come on when Talk button is pressed. Scenario 1 The MR-202 or MR-204 doesn’t have an intercom connection. If the EB-4W 4- Wire Option Module is connected, the MR-202 may not be receiving AC power.
  • Page 11 MR-202/MR-204 Two- and Four-Channel Headset Stations Clear-Com Intercom Systems Scenario 2 Defective headset. Solution: Test with another headset. Scenario 3 Plug P3 is missing on circuit board. Solution: Plug P3 must be installed in the J3 jack if the EB-4W or EB-TW option is not used.
  • Page 12 Excessive DC loading of intercom line. Solution: Remove any audio transformers or other equipment which 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.

  • Page 13: Parts Lists

    MR-202/MR-204 Two- and Four-Channel Headset Stations Clear-Com Intercom Systems PARTS LISTS Parts List for the MR-202/MR-204 Main PCB and Chassis Capacitors Value Type Volts Tol. Part # Designator Ceramic Disc 1.4KV 150029 Aluminum NP 150087 .047 Metal Film 100V 150123...
  • Page 14 Clear-Com Intercom Systems MR-202/MR-204 Two- and Four-Channel Headset Stations 15.0K OHM 1/10 411502 20.0K OHM 1/10 411514 R20 R25 R28 100K 1/10 411581 121K 1/10 411589 221K 1/10 411614 475K 1/10 411646 1.0M 1/10 411677 X4 SMD DIP Isolated1% 416016...
  • Page 15 MR-202/MR-204 Two- and Four-Channel Headset Stations Clear-Com Intercom Systems FIGURE 7: Main PCB Component Layout Rev. B © Clear-Com Intercom Systems 2000...
  • Page 16 FIGURE 8: MR-204 Main PCB © Clear-Com Intercom Systems 2000 Rev. B...
  • Page 17 MR-202/MR-204 Two- and Four-Channel Headset Stations Clear-Com Intercom Systems This page is a place holder. Rev. B © Clear-Com Intercom Systems 2000...

  • Page 18: Technical Specifications

    Clear-Com Intercom Systems MR-202/MR-204 Two- and Four-Channel Headset Stations Technical Specifications Headset Microphone Pre-Amp Input Type: Dynamic Impedance: 1k ohms Input Level: -55 dBV nominal; -10 dBV max. Gain from headset mic to intercom line: +41 dB Pre-Amp Response Curve...

  • Page 19: Notice About Specifications

    0.52 lbs. (0.23 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.

  • Page 20: Clear-Com Limited Warranty

    This warranty is the sole and exclusive express warranty given with respect to Clear-Com products. It is the responsibility of the user to determine before purchase that this product is suitable for the user's intended purpose.

  • Page 21: Non-Warranty Repair

    Clear-Com Intercom Systems Non-Warranty Repair Equipment that is not under warranty must be sent prepaid to Clear-Com. If requested, an estimate of repair costs will be issued prior to service. Once repair is approved and repair of equipment is completed, the equipment will be shipped freight collect from the factory.
  • Page 22 4065 Hollis Street, Emeryville, CA 94608 (510) 496-6666 Fax (510) 496-6601 Manual Part Number 810256 Rev. B...

This manual is also suitable for:

Mr-204

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