Telex MCE325 User Manual
USER INSTRUCTIONS
MODEL MCE325
PROGRAMMABLE USER STATION
9350-6464-00 Rev J, 7/2001
PROPRIETARY NOTICE
The RTS product information and design disclosed herein were originated by and are the property of Telex Communications, Inc. telex reserves all patent, proprietary design, manufacturing, reproduction, use and sales rights
thereto, and to any article disclosed therein, except to the extent rights are expressly granted to others.
COPYRIGHT NOTICE
Copyright © 1995-2001 by Telex Communications, Inc. All rights reserved. Reproduction in whole or in part without prior written permission from Telex is prohibited.
UNPACKING AND INSPECTION
Immediately upon receipt of the equipment, inspect the shipping container and the contents carefully for any discrepancies or damage. Should there be any, notify the freight company and the dealer at once.
WARRANTY INFORMATION
RTS products are warranted by Telex Communications, Inc. to be free from defects in materials and workmanship
for a period of three years from the date of sale.
The sole obligation of Telex during the warranty period is to provide, without charge, parts and labor necessary to
remedy covered defects appearing in products returned prepaid to Telex. This warranty does not cover any defect,
malfunction or failure caused beyond the control of Telex, including unreasonable or negligent operation, abuse,
accident, failure to follow instructions in the Service Manual or the User Manual, defective or improper associated
equipment, attempts at modification and repair not authorized by Telex, and shipping damage. Products with their
serial numbers removed or effaced are not covered by this warranty.
To obtain warranty service, follow the procedures entitled “Procedure For Returns” and “Shipping to Manufacturer
for Repair or Adjustment”.
This warranty is the sole and exclusive express warranty given with respect to RTS products. It is the responsibility
of the user to determine before purchase that this product is suitable for the user's intended purpose.
ANY AND ALL IMPLIED WARRANTIES, INCLUDING THE IMPLIED WARRANTY OF MERCHANTABILITY ARE LIMITED TO THE DURATION OF THIS EXPRESS LIMITED WARRANTY.
NEITHER TELEX NOR THE DEALER WHO SELLS RTS PRODUCTS IS LIABLE FOR INCIDENTAL OR
CONSEQUENTIAL DAMAGES OF ANY KIND.
CUSTOMER SUPPORT
Technical questions should be directed to:
Customer Service Department
RTS/Telex
12000 Portland Avenue South
Burnsville, MN 55337 U.S.A.
Telephone: (952) 848-4051
Fax: (800) 323-0498
RETURN SHIPPING INSTRUCTIONS
PROCEDURE FOR RETURNS
If a repair is necessary, contact the dealer where this unit was purchased.
If repair through the dealer is not possible, obtain a RETURN AUTHORIZATION from:
Customer Service Department
Telex Communications, Inc.
Telephone: (877) 863-4169
Fax: (800) 323-0498
DO NOT RETURN ANY EQUIPMENT DIRECTLY TO THE FACTORY WITHOUT FIRST OBTAINING A
RETURN AUTHORIZATION.
Be prepared to provide the company name, address, phone number, a person to contact regarding the repair, the type
and quantity of equipment, a description of the problem and the serial number(s).
SHIPPING TO MANUFACTURER FOR REPAIR OR ADJUSTMENT
All shipments of RTS products should be made via United Parcel Service or the best available shipper, prepaid. The
equipment should be shipped in the original packing carton; if that is not available, use any suitable container that is
rigid and of adequate size. If a substitute container is used, the equipment should be wrapped in paper and surrounded
with at least four inches of excelsior or similar shock-absorbing material. All shipments must be sent to the following
address and must include the Return Authorization.
Factory Service Department
Telex Communications, Incorporated
West 1st Street
Blue Earth, MN 56013 U.S.A.
Upon completion of any repair the equipment will be returned via United Parcel Service or specified shipper collect.
End-User License Agreement for Telex® Software
IMPORTANT - Please read this document carefully before using this product.
THIS DOCUMENT STATES THE TERMS AND CONDITIONS UPON WHICH TELEX COMMUNICATIONS,
INC. (the “COMPANY”) OFFERS TO LICENSE THE INSTALLED SOFTWARE OR PROGRAM (the “SOFTWARE”) FOR USE WITH THE PRODUCT IN WHICH IT WAS INSTALLED. YOU ARE AGREEING TO
BECOME BOUND BY THE TERMS OF THIS AGREEMENT. IF YOU DO NOT AGREE TO THE TERMS OF
THIS AGREEMENT, DO NOT USE THIS PRODUCT. PROMPTLY RETURN THE PRODUCT TO THE
PLACE WHERE YOU OBTAINED IT FOR A FULL REFUND.
The installed software as supplied by the Company is licensed, not sold, to you for use only under the terms of this
license, and the Company reserves all rights not expressly granted to you. You own the product or other media on or
in which the Software is originally or subsequently recorded or fixed, but the Company retains ownership of all
copies of the Software itself.
1. License: This license allows you to use the Software for internal purposes only on a single product in which it
was installed.
2. Restrictions: (a) You may not market, distribute or transfer copies of the Software to others or electronically
transfer or duplicate the Software. YOU MAY NOT REVERSE ENGINEER, DECOMPILE, DISASSEMBLE,
MODIFY, ADAPT, TRANSLATE, RENT, LEASE OR LOAN THE SOFTWARE OR CREATE DERIVATIVE
WORKS BASED ON THE SOFTWARE OR ANY ACCOMPANYING WRITTEN MATERIALS. (b) The Software and the accompanying written materials are copyrighted. Unauthorized copying of the Software, including
portions thereof or the written materials, is expressly forbidden. (c) You understand that the Company may update
or revise the Software and in so doing incurs no obligation to furnish such updates to you.
3. Limited Warranty: The Company does not warrant that the operation of the Software will meet your requirements or operate free from error. The Company DISCLAIMS ALL OTHER WARRANTIES AND CONDITIONS
EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY, FITNESS
FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT OF THIRD PARTY RIGHTS.
4. Limited Liability: The liability of the Company for any claims arising out of this License based upon the Software, regardless of the form of action, shall not exceed the greater of the license fee for the Software or $50.
TABLE OF CONTENTS
Description & Specifications 1-1
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Front Panel Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Channel Selector and Operation Buttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Volume Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Sidetone Nulling Trimmers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Connections, Inputs and Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Panel Microphone Jack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Rear Panel Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Intercom Lines. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
External Program Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Speaker Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Auxiliary Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Mounting Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
MCE325 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Microphone Preamplifier. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Headphone Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Speaker Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Power and Mechanical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
MCS325 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Installation 2-1
Internal Programming and Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Intercom Line-Channel Configurations (DS1-DS3, J6, J7, J19 & J20) . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Front Panel Setup Mode Lock-out (DS4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
ISO (DS5) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
Remote Talk-off (DS7) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
VOX (DS8) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
Program Assignment – IFB Option (J4, J5, J16-J18) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
Balanced/Unbalanced Dynamic Microphone Selection (J24) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
Headphone Sidetone Trimmer Adjustment (R37) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
Speaker Dim Adjustment (R157) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
Mechanical Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
Electrical Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
AC Power and Fuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
Intercom Lines J8, J9, and J10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
Connector Pin-outs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
Four-wire Output Termination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
Program Inputs, J14 and J15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
External Speaker, J27 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
Auxiliary Connector, J22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
Four-Wire Channel A and B Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
Key outputs – Expanded IFB Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
Remote Microphone Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
ISO Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
External Headset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
External Electret Microphone. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
i
Unswitched Microphone Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
External DC Power Source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
Remote Speaker Mute Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
Front Panel Headset Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
Headset Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
Headset Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
Operation 3-1
General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1
Operating Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1
Momentary/Latching Button action . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1
LED Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1
Channel Selection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1
Panel Mic/Headset Mic Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2
Microphone On/Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2
Speaker On/Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2
Volume Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Front Panel Sidetone Nulling Trimmer Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2
Sending and Receiving Call Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Using the Talk-Off Feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Front Panel Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-3
Activating Setup Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-3
Menu Selection/Ending Setup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-3
Submenus. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Channel ID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4
Four-channel Listen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Mono . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4
Call Disable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4
Button Lock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4
Latch Disable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4
Instant Mic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-5
Reset. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
Maintenance 4-1
Preventive Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1
Factory Support Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1
Corrective Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1
Access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1
Front Panel Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1
Cleaning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
Test and Adjustment Procedures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-2
Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-2
Test Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-2
Power Supply Test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
Initial Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-3
Keying Output Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-3
USMB (Un-Switched Microphone Balanced) Frequency Response and Level Check . . . . . . . . . . . . . . . . . .4-4
Frequency Response and Level Check, Mic to Line . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-4
Four-Channel, Two-Wire Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
Two-Channel, Four-Wire Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-5
Sidetone Null Test and Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-5
True Sidetone Adjust . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6
Level and Frequency Response Check, Intercom Channel to Headphone . . . . . . . . . . . . . . . . . . . . . . . . 4-6
Level and Frequency Response Check, Intercom Channel to Speaker. . . . . . . . . . . . . . . . . . . . . . . . . .4-7
Level and Frequency Response, Program to Headphones and Speaker . . . . . . . . . . . . . . . . . . . . . . . . .4-7
Program A to Left Headphone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-7
Program B to Right Headphone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-8
Program to Speaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-8
IFB Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-8
IFB B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8
ii
IFB A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9
Level and Frequency Response Check, Four-Wire Input to Headphone . . . . . . . . . . . . . . . . . . . . . . . . 4-9
Four-Wire A Input to Left Headphone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9
Four-Wire B input to Right Headphone. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9
Panel Mic to Channel Test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10
Carbon Mic to Channel Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10
VOX Test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10
Mic Kill Receive Test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10
Mic Kill Transmit Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-11
Call Transmit Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-11
Call Receive Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-11
ISO Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12
Remote Mic Switch Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12
Program Lockout Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12
Noise Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12
Parts Lists 5-1
Packaging Assembly (9000-6464-00) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
Final Assembly, MCE325 (9010-6464-00) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
Front Panel Assembly (9020-6261-00) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
Back Panel Assembly (9020-6262-00) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3
Heatsink Assembly (9020-6324-00) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3
Main PC Board Assembly (9030-6245-01) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3
PC Board Assembly, Front Panel (9030-6246-00) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-13
Diagrams 6-1
iii
iv
Description
General
The MCE325 is a four-channel, programmable intercom station. It may be used as a headset
station or, with the addition of the MCS325 Modular Speaker, as a speaker station. It may be
mounted in a console or equipment rack via optional mounting kits.
C
HAPTER
1
D
ESCRIPTION
& S
S ECTION
PECIFICATIONS
The MCE325 can be used with either two-wire or four-wire intercom lines, or a combination of
both. In this manual and in the labeling on the MCE325, references to channels 1, 2, 3, and 4
indicate two-wire lines; references to four-wire A and four-wire B indicate four-wire lines.
The MCE325 can be interfaced to a variety of external devices including external program
sources, two-way radios, paging systems, and satellite circuits. Some typical applications are
shown in Figure 1.2 through Figure 1.10.
Features
Features of the MCE325 include:
• Call Signaling: Call signaling is accomplished using an inaudible (20 kHz) signal to activate a
call indicator LED.
• Remote “talk-off”: Active, unattended remote station microphones may be deactivated by
momentarily injecting an inaudible (24 kHz) signal into the corresponding intercom line. The
MCE325 can send and receive “talk-off” signals.
• VOX circuit: The MCE325 may be programmed for voice activation of the microphone.
• Simple IFB: Program audio assigned to a channel is interrupted during talk.
• External device keying: External devices, such as two-way radios, speaker mute relays, or
paging systems may be activated through key outputs at the auxiliary connector on the rear
panel. The key outputs may also be used to expand the simple IFB function, allowing any one
of a number of MCE325 stations to interrupt the program source and talk on the line.
• Microphone limiter: The microphone preamplifier circuit contains a limiter, which helps to
equalize voice levels.
• Fully programmable: Retains programming even when power is shut off.
1-1
NOTE
Front Panel Features
Channel Selector and Operation Buttons
These buttons have two modes of operation: standard operating mode and program, or setup,
mode. The printing on the face of each button indicates its function in standard operating mode;
printing under each button indicates its setup mode function. (See Section 3 for operation and
programming instructions.) An LED located above each button provides status information.
The MCE325 is factory pre-programmed for two-channel operation, with each channel having
one talk and one listen button. However, the MCE325 may also be programmed so that each
channel selector button controls both talk and listen for a single channel, permitting operation of
up to four intercom channels. Additionally, users may wish to customize the identification of
channels. With this in mind, a button kit has been supplied with the MCE325 to allow you to
customize the button labeling to suit your particular application. Figure 1.11 shows the available
button caps as well as some typical button configurations.
The standard buttons are opaque. As a result, the front panel LED’s may not be visible when
viewing the MCE325 from a low angle (such as when it is mounted high in an equipment rack).
As a remedy for this problem, clear buttons are available that allow the LED light to pass through.
(Order RTS™ part no. 9000-2698-800)
Volume Controls
CH1 (VOL 1): This control adjusts the volume of channels 1 and/or 3 to the left headphone when
stereo headphones are used. It adjusts the mono mix level of these channels when monaural
headphones or an external speaker is used.
CH2 (VOL 2): This control adjusts the volume of channels 2 and/or 4 to the right headphone
when stereo headphones are used. It adjusts the mono mix level of these channels when monaural
headphones or an external speaker is used.
PGM VOL: This control adjusts the mono mix of program A and program B (input at the rear
panel and assigned via internal programming) to the headphones and external speaker.
Sidetone Nulling Trimmers
These trimmers are adjusted to prevent acoustic feedback when using a panel microphone along
with an external speaker.
Connections, Inputs and Outputs
Front Panel
DYNamic MIC HEADSET: This connector accepts a stereo-earphone, dynamic-microphone
headset (with or without a mic on/off switch).
CARBon MIC HEADSET: This connector accepts a standard 3-conductor, ¼-inch phone plug.
The necessary phantom power is provided to power a carbon microphone or its electronic
equivalent.
Panel Microphone Jack
The MCE325 may be optionally fitted with a gooseneck panel microphone by removing the
blanking plug located in the upper-right corner of the front panel. The panel microphone jack
accepts specially made gooseneck microphones (MCP-90 series), which are available from RTS.
1-2 MCE325 User Instructions
Figure 1.1
MCE325 front and rear panel features.
Rear Panel Features
Intercom Lines
Connectors J8 and J9 are parallel-wired for loop-through connection to additional stations. These
connectors are used either for two-wire channels 1 and 2 input/output, or four-wire channel A
output. (The four-wire channel A input is connected at the auxiliary connector.)
Connector J10 is used for two-wire channel 3 and 4 input/output, or four-wire channel B output,
but no loop-through connector is provided for these channels. (The four-wire channel B input is
connected at the auxiliary connector.)
The MCE325 presents a bridging impedance of 10,000 ohms to the intercom line, and is designed
for use with intercom lines having a 200-ohm line terminating impedance. A 200 ohm termination
plug is supplied (connected to J10) to prevent channels three and four from oscillating when the
MCE325 is in two-channel mode.
External Program Input
Two ¼-inch phone jacks are provided for external program input. The station accepts line-level,
balanced input. The two program inputs are mixed internally, and may be assigned (through
internal programming) to right headphone, left headphone, external speaker, or any combination
of these. In addition, program A may be assigned (through internal programming) to two-wire
channel 3 or four-wire channel A; program B may be assigned to two-wire channel 4, but cannot
1-3
be assigned to a four-wire channel. The program assigned to channels is interrupted during talk
output.
Speaker Output
A ¼-inch phone jack is provided for connection of an external speaker (8-ohms minimum
impedance). The speaker output is compatible with the MCS325 speaker.
Auxiliary Connector
Standard Options on the 25-pin, female, D-Sub connector are:
1 Unswitched microphone output
2 ISO connection to a VCP6A/VCP12A/VCP12B
3 Microphone on/off switch
4 Remote headset
5 Remote panel microphone
6 Separate inputs for +10 to +15 volts DC, and +17 to +24 volts DC
7 Common/ground circuit
8 Four-wire channel A and B inputs
9 Remote speaker mute
10Key outputs
Programming
Three methods of programming are used:
1 Front panel programming via the channel selector and operation buttons.
2 Internal programming via circuit board DIP switches.
3 Internal programming via circuit board jumpers.
The most commonly programmed options are assigned to the front panel for convenience.
Detailed information on internal programming is provided in Section 2, Installation. Detailed
information on front panel programming is provided in Section 3, Operation.
Power
The MCE325 is designed for local powering, and is supplied ready for use with either 115 or 230
VAC (but not both). The unit may also be powered from an external DC source connected at the
Auxiliary (J22) connector on the rear panel. For information on changing the AC supply voltage
configuration, or using DC power, see Section 2.
Mounting Configuration
Mounting configurations are illustrated in Figure 2.3 and include rack mount speaker station,
console mount headset station, rack mount headset station, desk top headset station, and portable
speaker station. Some mounting configurations may require a remotely located microphone or
headset. These may be connected to the Auxiliary connector (J22) on the back of the unit.
1-4 MCE325 User Instructions
MCE325 Specifications
General
Bridging Impedance (to line) 10,000 ohms typical
Noise Contribution to 200-ohm Line -90 dBu
Call Signal Frequency 20 kHz, crystal controlled
Talk-off Frequency 24 kHz, crystal controlled
Microphone Preamplifier
Maximum Voltage Gain 54 dB
Frequency Response 100 Hz to 8,000 Hz, ±3 dB
Input Impedance 1,000 ohms
Limiter Range 30 dB
Headphone Amplifier
Maximum Voltage Gain 30 dB
Frequency Response 100 Hz to 8,000 Hz, ±3 dB
Headphone Impedance 50 to 600 ohms
Output Power 150 mW into 50 ohms
Output Voltage Level 8 Vp-p
Speaker Amplifier
Maximum Voltage Gain 30 dB
Frequency Response 100 Hz to 8,000 Hz, ±3 dB
Speaker Impedance 8 to 16 ohms
Output Power per Amplifier 5W into 8 ohms
Output Voltage Level 16 Vp-p
Power and Mechanical
Power Requirements 115 to 230 VAC, 20 VA max,
12 to 25 VDC, 100 to 125 mA quiescent, 900 mA max
Dimensions 1.72” H x 8.2” W x 8” D (44 mm x 208 mm x 203 mm)
Weight 4.25 lbs (1.93kg)
Material/Finish Thermo-plastic front panel, aluminum case, light gray
finish
1-5
Connectors
Intercom Line Connector XLR type, 3-pin (male-female loop through on two-wire
Dynamic Mic XLR type, 6-pin female
Carbon Mic ¼-inch phone jack, 3-circuit
Auxiliary Connector 25-pin, female, D-Sub
Program Inputs ¼-inch phone jack, 3-circuit
Speaker Output ¼-inch phone jack, 3-circuit
Panel Mic ¼-inch phone jack, metal busing, 3-circuit
MCS325 Specifications
The MCS325 is designed for use with MCE325, but may also be used as a general-purpose
monitor for program material.
Impedance 8 ohms (DCR5.5 to 7 ohms)
Power Rating 5W RMS continuous
Sensitivity 90 dB ±2 dB/2.83 volts/one meter on axis averaged over
channel 1 and 2, or four-wire channel A; Female only on
two-wire channel 3 and 4, or four-wire channel B
one octave bands centered at 250 Hz, 500 Hz, 1 kHz,
2 kHz, 4 kHz, and 8 kHz when enclosed in a sealed box
of 1.3 liters volume.
Frequency Response 200 Hz to 10 kHz ±4 dB on 1/10 octave measurement in
1.3 liter sealed box.
Free Air Resonance 200 Hz to 250 Hz
Distortion Less than 10% @ 5W at resonance.
Stray Magnetic Field Less than 1 gauss at 1 cm from chassis.
Mechanical Noise Unit to be free of buzzes and rattles at 5 W sine wave
input from 100 Hz to 10 kHz.
Figure 1.2
Standard two-channel, two-wire configuration.
1-6 MCE325 User Instructions
Figure 1.3
Standard four-channel, two-wire configuration.
Figure 1.4
Figure 1.5
A four-channel, two-wire configuration with two channels used for IFB’s.
Configuration for one or two two-wire channels and one four-wire channel.
1-7
Figure 1.6
Standard two-channel, four wire configuration.
Figure 1.7
Multiple interconnected stations in four-channel, two-wire configuration with two channels
used for IFB’s.
1-8 MCE325 User Instructions
Figure 1.8
Multiple interconnected stations using one four-wire intercom channel and two two-wire
channels for IFB’s.
Figure 1.9
A four-channel, two-wire configuration with two channels used for IFB’s (shown with TELCO
interface).
1-9
Figure 1.10
Configuration for an ENG truck using one four-wire intercom channel and two two-wire
IFB’s.
1-10 MCE325 User Instructions
Figure 1.11
MCE325 button configurations.
1-11
1-12 MCE325 User Instructions
Internal Programming and Adjustments
WARNING
Hazardous voltages exist inside this equipment. Disconnect the AC line cord before
opening the equipment or attempting any internal programming or adjusting.
General
S ECTION
C
HAPTER
2
I
NSTALLATION
Prior to installing the MCE325, it may be necessary to change some of the internal programming
to suit your particular application. Table 2.1 and Table 2.2 list the functions for the DIP switches
and jumpers which are used for internal programming. Also shown are the default settings that
were pre-programmed at the factory.
If your application requires settings that are different from the defaults, you will have to remove
the top cover of the unit (see Figure 2.1) and make the required changes. If you do change the
internal programming, it may be useful to note the changes for future reference.
The locations of the DIP switches and jumpers are illustrated in Figure 2.2. DIP switch
programming is accomplished by setting switches to the “off” or “on” positions. Jumper
programming is accomplished using shorting jumpers. By inserting the jumpers to short the
appropriate pins, a function is either assigned or not assigned. Pin 1 of each jumper is indicated by
a square symbol in Figure 2.2 for reference when making changes. Also shown in Figure 2.2 are
trimmers for adjusting the sidetone and speaker dimming levels. Usage of the DIP switches,
jumpers, and level trimmers is described in the following paragraphs.
2-1
Figure 2.1
Top cover removal.
NOTE
Intercom Line-Channel Configurations (DS1-DS3, J6, J7, J19 & J20)
The four channels of the MCE325 may be assigned to intercom lines in a variety of ways.
Channel assignment is determined by the settings of DIP switches DS1 through DS3 and jumpers
J6, J7, J19, and J20. There are six possible intercom line configurations. These are listed in Table
2.3 together with the proper DIP switch and jumper settings for each.
Table 2.1
Switch Number Switch Function Default Setting
DS1 four-wire CH A output not installed (off), four-wire CH A output installed
DS2 four-wire CH B output not installed (off), four-wire CH B output installed
DS3 two-channel mode (off)*, four-channel mode (on) Off
DS4 Front panel setup lock-out disabled (off), Front panel setup lock-out
DS5 Listen and talk muted during ISO (off), Talk only muted during ISO (on) Off
DS6 Not used Off
DS7 Talk-off transmit disabled (off), Talk-off transmit enabled (on) On
DS8 VOX disabled (off), VOX enabled (on) Off
The terms “two-channel mode” and “four-channel mode” apply only to two-wire lines. In twochannel mode, each two-wire line uses two channel selector buttons: one for talk and one for
listen. In four-channel mode, each two-wire line uses one channel selector button for both talk and
listen.
DIP switch functions and default settings.
Off
(on)
Off
(on)
Off
enabled (on)
The two-channel mode should be selected under only two circumstances:
1 When only one or two two-wire lines are connected to channels one and two only.
2-2 CSI-200 User Instructions
2 When a two-wire line is connected to channel one and a four-wire line is connected to channel
B.
For all other intercom line configurations that use two-wire lines, DS3 must be set to the “on”
position for four-channel operation.
Table 2.2
Jumper Number Jumper Function Default Setting
J4 Assigns PROGRAM A input to two-wire CH 3 or four-wire CH B.
J5 Assigns PROGRAM B input to two-wire CH 4.
J6 Selects two-wire CH1 and CH 2, or four-wire CH A output. (See J19
J7 Selects two-wire CH 3 and CH 4, or four-wire CH B output. (See J20
J16 Assigns mono mix of the PROGRAM A and B inputs to the left
J17 Assigns mono mix of the PROGRAM A and B inputs to the right
J18 Assigns mono mix of the PROGRAM A and B inputs to the speaker.
J19 Selects four-wire CH A input. Off (not used): pins 2 & 3 shorted.*
J20 Selects four-wire CH B input. Off (not used): pins 2 & 3 shorted.*
J24 Selects unbalanced or balanced dynamic mic input.
Jumper functions and default settings.
Not assigned
Not assigned: pins 2 & 3 shorted.
Assigned: pins 1 & 2 shorted (IFB to CH 3).
Not assigned
Not assigned: pins 2 & 3 shorted.
Assigned: pins 1 & 2 shorted (IFB to CH 4).
Two-wire operation
for CH A input.)
CH1 and CH 2 selected: pins 2 & 3 shorted.
Four-wire CH A output selected: pins 1 & 2 shorted.
Two-wire operation
for Ch B input.)
CH 3 and CH 4 selected: pins 2 & 3 shorted.
Four-wire CH B output selected: pins 1 & 2 shorted.
Assigned
headphone.
Not assigned: pins 2 & 3 shorted.
Assigned: pins 1 & 2 shorted.
Assigned
headphone.
Not assigned: pins 2 & 3 shorted.
Assigned: pins 1 & 2 shorted.
Assigned
Not assigned: pins 2 & 3 shorted.
Assigned: pins 1 & 2 shorted.
Off
On when LISTEN 1 button is on: pins 1 & 2 shorted.
Always on: pins 3 & 4 shorted.
Off
On when LISTEN 2 button is on: pins 1 & 2 shorted.
Always on: pins 3 & 4 shorted.
Unbalanced mic input
Unbalanced: pins 2 & 3 shorted.
Balanced: pins 1 & 2 shorted.
NOTE
*J19 and J20 jumpers should be in “off” positions when two-wire lines are used.
2-3
Figure 2.2
Internal DIP switches, jumpers and level trimmers.
2-4 CSI-200 User Instructions
Table 2.3
DIP SWITCHES JUMPERS
DS1 DS2 DS3 J6 J7 J19 J20
Configuration 1: Two 2-wire lines (CH 1& CH 2). (Default configuration.)
Off Off Off Pins 2 & 3 shorted Pins 2 & 3 shorted Pins 2 & 3 shorted Pins 2 & 3 shorted
Configuration 2: Three or four 2-wire lines (CH 1, CH 2, CH 3, CH 4).
Off Off On Pins 2 & 3 shorted Pins 2 & 3 shorted Pins 2 & 3 shorted Pins 2 & 3 shorted
Configuration 3: One 2-wire line (CH 1); One 4-wire line (CH B).
Off On Off Pins 2 & 3 shorted Pins 1 & 2 shorted Pins 2 & 3 shorted Pins 1 & 2 shorted
Configuration 4: Two 2-wire lines (CH1 & CH2); One 4-wire line (CH B).
Off On On Pins 2 & 3 shorted Pins 1 & 2 shorted Pins 2 & 3 shorted Pins 1 & 2 shorted
Configuration 5: Two 2-wire lines (CH 3 & CH4); One 4-wire line (CH A).
On Off On Pins 1 & 2 shorted Pins 2 & 3 shorted Pins 1 & 2 shorted Pins 2 & 3 shorted
Configuration 6: Two 4-wire lines (CH A & CH B).
On On On Pins 1 & 2 shorted Pins 1 & 2 shorted Pins 1 & 2 shorted Pins 1 & 2 shorted
Internal programming for the various intercom line configurations.
NOTE
See Table 3.1for a summary of how the channel selector buttons work for the various
configurations. The MCE325 is typically supplied with a termination plug inserted into J10. This
plug terminates CH 3 and CH 4 with 200 ohms to prevent oscillation when these channels are not
used. When the channels are used, this termination plug should be removed.
Front Panel Setup Mode Lock-out (DS4)
DIP switch DS4 may be set to lock out the front panel programming and prevent changes. Front
panel programming is described in Section 3, Operation.
ISO (DS5)
The MCE325 may be used with an RTS Model VCP6A, VCP12A, or VCP12B Control Station to
permit private conversation between the MCE325 operator and a camera operator. When ISO
mode is engaged, either talk, or talk and listen (depending on the setting of DS5) for all other
channels connected to the MCE325 will be muted, and a private line will be established between
the MCE325 operator and the camera operator. See “ISO Connection” for wiring information.
Remote Talk-off (DS7)
The MCE325 is capable of generating and transmitting an inaudible, 24 kHz signal on an
intercom channel. This signal is used to turn off the microphones on any remote stations on the
channel (stations with remote talk-off feature only). This feature is useful when an unattended
user station with an activated microphone is introducing unnecessary noise into a line. DIP switch
DS7 enables/disables this feature. When remote talk off is enabled, the talk-off signal is activated
using the CALL button on the front panel. (for Operation see “Using the Talk-Off Feature”.)
VOX (DS8)
DIP switch DS8 turns the voice activated microphone circuit on or off. Voice activation can be
used with the panel microphone, a headset, or a remote microphone connected at the rear panel.
(There is no adjustment for VOX sensitivity.)
2-5
Program Assignment – IFB Option (J4, J5, J16-J18)
Jumper J4 assigns PROGRAM A to two-wire CH 3 or four-wire CH B with interrupt during talk
(IFB A). Jumper J5 assigns PROGRAM B to CH 4 with interrupt during talk (IFB B).
(PROGRAM B is not used in four-wire mode.)
Jumpers J16, J17, and J18 assign the mono mix of both program inputs to the left headphone,
right headphone, and speaker respectively. Program volume to the headphones and speaker is
controlled by the PGM VOL control on the front panel.
See Table 2.2 for Jumper settings. See Figure 2.2 for locations of jumpers.
Balanced/Unbalanced Dynamic Microphone Selection (J24)
The MCE 325 may be used with headsets having either a balanced or unbalanced dynamic
microphone. The MCE325 is pre-programmed for use with an unbalanced microphone by
shorting J24 pins 2 and 3. For balanced microphones, remove the shorting jumper and reinstall it
to short pins 1 and 2.
Headphone Sidetone Trimmer Adjustment (R37)
The headphone sidetone trimmer (R37) adjusts the loudness of your own voice heard in your
headset when the microphone is on and the speaker is off. (It does not affect the actual level heard
on the intercom lines.) This trimmer is preset so that your voice level in the headphones will be
approximately ¾ of the intercom line level. To prevent feedback, this signal is automatically
turned off when the external speaker is turned on with the SPKR ON switch.
Speaker Dim Adjustment (R157)
When an external speaker is used, switching the microphone on will cause the speaker level to
attenuate. The level of attenuation may be adjusted with the speaker dim trimmer (R157). The
minimum attenuation of 6 dB is preset at the factory (R157 fully clockwise). The range of
adjustment is –6 dB to –40 dB.
Mechanical Installation
Dimensional requirements for the various mounting configurations are illustrated in Section 6.
Also allow an additional 4.0 inches (102 mm) of rear panel clearance for connectors.
If the headset connector is remotely located (See “External Headset”), allow space between the
cable and interfering sources such as TV monitors, power supplies and equipment with internal
power supplies. The MCE325 has no special ventilation space requirements.
Assembly of optional mounting components is shown in Figure 2.3.
2-6 CSI-200 User Instructions
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