Telex MCE325 manual ISO Test, Remote Mic Switch Test, Program Lockout Test, Noise Checks

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ISO Test

1Set DIP switch DS3 to off (two-channel, two-wire mode).

2Set DIP switch DS5 to on (talk muted during ISO).

3Set all TALK and LISTEN buttons to on.

4Connect a 100 ohm resistor from the ISO input (J22 pin 12) to circuit common (J22 pin 10). Observe that the MIC ON LED turns on and the channel 1 and 2 TALK buttons turn off.

5Remove the 100 ohm resistor across the ISO input.

6Reset DIP switch DS3 to on and DS5 to off.

Remote Mic Switch Test

1Set all buttons to off.

2Connect a 100 ohm resistor from the remote mic switch input (J22 pin 25) to circuit common (J22 pin 10), and observe that the MIC ON LED turns on.

3Remove the 100 ohm resistor.

Program Lockout Test

1Set DIP switch DS4 to on (front panel setup lockout enabled).

2Press and hold the CALL button for ten seconds, and verify that the MCE325 does not enter program mode.

3Reset DS4 to off.

Noise Checks

1Connect a 150 ohm load across the dynamic mic input (J2 pins 1 and 2).

2Connect an 8 ohm load across the speaker output.

3Connect 51 ohm loads across the left headphone output (J2 pins 3 & 4) and right headphone output (J2 pins 3 &5).

4Terminate each intercom channel into 200 ohms.

5Set the MIC ON button to on.

6Set the SPKR ON button to on.

7Set all other front panel buttons to off.

8Set all volume controls to minimum.

Note: Noise measurements in the following steps were made using a 30 kHz low pass filter with +20 dB of gain inserted between the AC voltmeter and the MCE325.

9Set the CH 1-3 volume control to maximum. Measure noise across the left headphone output. It should measure -44 dBu or less.

10Set the CH 1-3 volume control to minimum and set the CH 2-4 volume control to maximum. Measure noise across the right headphone output. It should measure –44 dBu or less.

11Set the CH 2-4 volume control to minimum. Measure noise across the speaker output. The meter should read –44 dBu or less.

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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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