Telex MCE325 manual Mechanical Installation, Program Assignment IFB Option J4, J5, J16-J18

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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.

2-6C S I - 2 0 0 U s e r I n s t r u c t i o n s

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Contents Model MCE325 Proprietary Notice Return Shipping Instructions End-User License Agreement for Telex Software Table of Contents Operation Diagrams Page General FeaturesDescription Front Panel Features Connections, Inputs and OutputsRear Panel Features Intercom LinesProgramming PowerMounting Configuration Microphone Preamplifier MCE325 SpecificationsPower and Mechanical Headphone AmplifierMCS325 Specifications ConnectorsStandard four-channel, two-wire configuration Standard two-channel, four wire configuration Page 10M C E 3 2 5 U s e r I n s t r u c t i o n s 11 MCE325 button configurations 12M C E 3 2 5 U s e r I n s t r u c t i o n s Installation Internal Programming and AdjustmentsSwitch Number Switch Function Default Setting Jumper Number Jumper Function Default Setting Internal DIP switches, jumpers and level trimmers Front Panel Setup Mode Lock-out DS4 Remote Talk-off DS7Speaker Dim Adjustment R157 Mechanical InstallationHeadphone Sidetone Trimmer Adjustment R37 Program Assignment IFB Option J4, J5, J16-J18Mounting configurations Intercom Lines J8, J9, and J10 Electrical InstallationAC Power and Fuse Program Inputs, J14 and J15 Auxiliary Connector, J22Four-Wire Channel a and B Input External Speaker, J27ISO Connection Remote Microphone SwitchKey outputs Expanded IFB Option External HeadsetFront Panel Headset Connections Carbon-microphone headset connector Operating Instructions LED IndicatorsGeneral Momentary/Latching Button actionPanel Mic/Headset Mic Selection Volume AdjustmentFront Panel Sidetone Nulling Trimmer Adjustment Microphone On/OffFront Panel Programming Channel ID Call DisableLatch Disable Four-channel ListenReset Instant Mic6C S I 2 0 0 U s e r I n s t r u c t i o n s Access Preventive MaintenanceCorrective Maintenance Factory Support InformationPower Supply Test Test and Adjustment ProceduresCleaning Test EquipmentInitial Configuration Keying Output TestFour-Channel, Two-Wire Mode Frequency Response and Level Check, Mic to LineSidetone Null Test and Adjustment Two-Channel, Four-Wire ModeTrue Sidetone Adjust Talk Button Test Point PotentiometerProgram a to Left Headphone Program to Speaker IFB TestProgram B to Right Headphone Four-Wire a Input to Left Headphone Four-Wire B input to Right HeadphoneVOX Test Panel Mic to Channel TestCarbon Mic to Channel Test Mic Kill Receive TestCall Receive Test Mic Kill Transmit TestCall Transmit Test Program Lockout Test Remote Mic Switch TestISO Test Noise ChecksPage 14C S I 2 0 0 U s e r I n s t r u c t i o n s Packaging Assembly Final Assembly, MCE325Front Panel Assembly Main PC Board Assembly Back Panel AssemblyHeatsink Assembly 4C S I 2 0 0 U s e r I n s t r u c t i o n s Reference 9027-6245-01 Drawing, Section CR1 FB1 #73 Shield Bead 8C S I 2 0 0 U s e r I n s t r u c t i o n s Reference 9027-6245-01 Drawing, Section 10C S I 2 0 0 U s e r I n s t r u c t i o n s RP2 Washer Flat PC Board Assembly, Front Panel DS1-DS814C S I 2 0 0 U s e r I n s t r u c t i o n s Diagrams 2C S I 2 0 0 U s e r I n s t r u c t i o n s Date 7/23/01 Title D\TEMP\AS624501D.cal Title D\TEMP\AS626101C.cal Title D\TEMP\AS626201C.cal Date 7/19/01 Title D\TEMP\AS646401G.dwg Title D\TEMP\BD646401A.cal Title D\TEMP\IS671801A.cal Title D\TEMP\OD635501A.cal Title D\TEMP\OD635502A.cal Title D\TEMP\OD635503A.cal Title D\TEMP\OD635504A.cal Title c\home\cms\benedil\view\9000-646401.CAL Telex Mother Board Mother Board MCE325 Title D\TEMP\SD624601A.cal

MCE325 specifications

The Telex MCE325 is a sophisticated communications headset designed primarily for professionals who demand clarity and reliability in their audio equipment. Renowned for its advanced features and high-quality construction, the MCE325 is a popular choice in various fields, including aviation, broadcast, and live event production.

One of the standout features of the Telex MCE325 is its superior noise-cancellation technology. This headset is engineered to effectively reduce ambient noise, allowing users to focus on important audio signals without distractions. The exceptional passive noise isolation works in tandem with the active noise-cancelling capabilities to ensure that you can communicate clearly, even in loud environments.

The MCE325 also incorporates a high-performance microphone that delivers crystal-clear sound transmission. The flexible boom design allows users to position the microphone for optimal voice pickup, making it suitable for both left- and right-handed users. The microphone’s windscreen further minimizes wind noise, providing an extra layer of clarity during outdoor use.

Comfort is a critical aspect of the MCE325. The headset features plush, padded ear cups that provide excellent comfort for extended use. The adjustable headband ensures a secure fit, catering to a wide range of head sizes and shapes. This ergonomic design minimizes fatigue, allowing users to maintain focus during long hours of operation.

Connectivity is another area where the Telex MCE325 excels. It is versatile enough to work with various devices, thanks to its dual 1/4” and XLR connectors. This flexibility makes it compatible with many audio interfaces and communication systems used in professional settings. The headset also includes a detachable cable, allowing for easy replacement if needed.

The construction of the Telex MCE325 reflects a commitment to durability and longevity. Built with high-quality materials, the headset can withstand the rigors of demanding professional environments. This robustness ensures that users can trust the MCE325 in the most challenging situations, whether it’s in a busy studio or a bustling airport.

In summary, the Telex MCE325 is a versatile and reliable headset designed to meet the needs of professionals across various industries. With its cutting-edge noise-cancellation technology, high-quality microphone, comfort-focused design, versatile connectivity options, and durable construction, it stands out as an ideal choice for anyone seeking superior audio performance and reliability. Whether in communications, aviation, or live broadcasting, the MCE325 delivers an exceptional audio experience.
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