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Telex MCE325 manual Mic Kill Transmit Test, Call Transmit Test, Call Receive Test

Models: MCE325

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Mic Kill Transmit Test

11Try turning the MIC ON button on. It should not stay on.

12Adjust signal generator to –5 dBu at 25.680 kHz.

13Try turning the MIC ON button on and off. It should turn on and off as usual. 14Adjust signal generator to –5 dBu at 24.480 kHz.

15Try turning the MIC ON button on. It should not stay on.

16Remove the signal generator from channel 1.

Mic Kill Transmit Test

1Set all front panel buttons to off.

2Connect a frequency counter an AC meter to the intercom channel 1 output.

3Transmit a mic kill signal on intercom channel 1 (tap the CALL button 3 times, then press and hold the CH 1 TALK key).

4Check that the signal on the channel 1 output is between 23.7 to 23.9 kHz at –9.8 dBu ±2 dBu.

5Release the CH 1 TALK button.

Call Transmit Test

1Set all front panel buttons to off.

2Transmit a call signal on intercom channel 1 (tap the CALL button, and while the call LED is flashing, press and hold the CH 1 TALK key).

3Check that the signal on the channel 1 output is between 19.9 to 20.1 kHz at –9.8 dBu ±2 dBu.

4Release the CH 1 TALK button.

Call Receive Test

1Set all buttons to off.

2Reconnect the signal generator to intercom channel 1.

3Adjust signal generator to –5 dBu, 20 kHz (check frequency with frequency counter).

4Check that the CALL and CH 1 TALK LED’s are flashing.

5Attenuate the signal input by 20 dB, and check that the LED’s are still flashing.

6Attenuate the signal an additional 10 dB. The LED’s should stop flashing.

7Adjust signal generator to –5 dBu, 18.600 kHz.

8Verify that the LED’s do not flash.

9Adjust signal generator to –5 dBu, 21.400 kHz.

10Verify that the LED’s do not flash.

11Adjust signal generator to –5 dBu, 19.600 kHz.

12Verify that the LED’s do flash.

13Adjust signal generator to –5 dBu, 20.400 kHz.

14Verify that the LED’s do flash.

15Remove the signal generator and frequency counter.

4-11

Image 49

Telex MCE325 manual Mic Kill Transmit Test, Call Transmit Test, Call Receive Test

Contents

USER INSTRUCTIONS MODEL MCE325PROGRAMMABLE USER STATION PROPRIETARY NOTICE WARRANTY INFORMATIONCOPYRIGHT NOTICE UNPACKING AND INSPECTIONRETURN SHIPPING INSTRUCTIONS End-UserLicense Agreement for Telex Software Description & Specifications TABLE OF CONTENTSInstallation Operation MaintenanceDiagrams Parts ListsPage Features DESCRIPTION & SPECIFICATIONSDescription GeneralVolume Controls Front Panel FeaturesConnections, Inputs and Outputs Channel Selector and Operation ButtonsIntercom Lines Rear Panel FeaturesExternal Program Input Mounting Configuration PowerAuxiliary Connector ProgrammingPower and Mechanical MCE325 SpecificationsMicrophone Preamplifier Headphone AmplifierConnectors MCS325 SpecificationsFigure 1.3 Standard four-channel, two-wireconfiguration 1-8 M C E 3 2 5 U s e r I n s t r u c t i o n s Figure 1.8 Multiple interconnected stations using one four-wireintercom channel and two two-wirechannels for IFB’s 1-10 M C E 3 2 5 U s e r I n s t r u c t i o n s Figure 1.11 MCE325 button configurations 1-12 M C E 3 2 5 U s e r I n s t r u c t i o n s Internal Programming and Adjustments INSTALLATIONGeneral S E C T I O NSwitch Function Switch NumberDefault Setting Figure 2.1 Top cover removalDefault Setting Table 2.2 Jumper functions and default settingsJumper Number Jumper Function2-4 C S I - 2 0 0 U s e r I n s t r u c t i o n s ISO DS5 Front Panel Setup Mode Lock-outDS4Remote Talk-offDS7 VOX DS8Headphone Sidetone Trimmer Adjustment R37 Mechanical InstallationSpeaker Dim Adjustment R157 Program Assignment - IFB Option J4, J5, J16-J18Figure 2.3 Mounting configurations AC Power and Fuse Electrical InstallationConnector Pin-outs Four-wireOutput TerminationFour-WireChannel A and B Input Auxiliary Connector, J22Program Inputs, J14 and J15 External Speaker, J27Key outputs - Expanded IFB Option Remote Microphone SwitchISO Connection External HeadsetUnswitched Microphone Output Front Panel Headset ConnectionsExternal DC Power Source External Electret MicrophoneSECTION Table 2.9 Carbon-microphoneheadset connectorFUNCTION Carbon microphoneOPERATION LED IndicatorsGeneral Operating InstructionsFront Panel Sidetone Nulling Trimmer Adjustment Volume AdjustmentPanel Mic/Headset Mic Selection Microphone On/OffUsing the Talk-OffFeature Sending and Receiving Call SignalsActivating Setup Mode Menu Selection/Ending SetupLatch Disable Call DisableChannel ID Four-channelListenInstant Mic Reset3-6 C S I - 2 0 0 U s e r I n s t r u c t i o n s Preventive Maintenance MAINTENANCECorrective Maintenance AccessCleaning Test and Adjustment ProceduresPower Supply Test Test EquipmentKeying Output Test Initial ConfigurationFrequency Response and Level Check, Mic to Line Four-Channel, Two-WireModeTwo-Channel, Four-WireMode Sidetone Null Test and AdjustmentTrue Sidetone Adjust Program A to Left Headphone Program B to Right Headphone IFB TestProgram to Speaker IFB BFour-WireB input to Right Headphone Four-WireA Input to Left HeadphoneIFB A Carbon Mic to Channel Test Panel Mic to Channel TestVOX Test Mic Kill Receive TestCall Transmit Test Mic Kill Transmit TestCall Receive Test ISO Test Remote Mic Switch TestProgram Lockout Test Noise Checks15Turn all buttons off Page Packaging Assembly PARTS LISTSFinal Assembly, MCE325 S E C T I O NTable 5.3 Reference AS6261 Drawing, Section Front Panel AssemblyItem No DescriptionHeatsink Assembly Back Panel AssemblyMain PC Board Assembly Item NoC104 Capacitor, EL, 10µF Capacitor, Mylar, 1nF Diode, 1N4004 Transistor, 2N5210 R170 R267 Resistor, CF, 22K Ohm, 5%, 1/8W IC, Dual Low-noise Op-Amp,NE5532N Table 5.7 Reference AS6246 Drawing, Section PC Board Assembly, Front PanelRef No DescriptionPage S E C T I O N DIAGRAMS6-2 C S I - 2 0 0 U s e r I n s t r u c t i o n s Title D \TEMP\AS6246 01B.cal Date 7/23/01Time 05 20 45 PM Time 05 27 24 PM Title D \TEMP\AS6245 01D.calDate 7/23/01 Time 05 21 25 PM Title D \TEMP\AS6261 01C.calDate 7/23/01 Time 05 22 16 PM Title D \TEMP\AS6262 01C.calDate 7/23/01 Time 02 05 07 PM Date 7/19/01Title C \home\cms\benedil\view\9020-6324 01.DWG Time 05 23 05 PM Title D \TEMP\AS6464 01G.dwgDate 7/23/01 Time 05 23 33 PM Title D \TEMP\BD6464 01A.calDate 7/23/01 Time 05 24 13 PM Title D \TEMP\IS6718 01A.calDate 7/23/01 Time 05 24 51 PM Title D \TEMP\OD6355 01A.calDate 7/23/01 Time 05 25 30 PM Title D \TEMP\OD6355 02A.calDate 7/23/01 Time 05 26 07 PM Title D \TEMP\OD6355 03A.calDate 7/23/01 Time 05 26 42 PM Title D \TEMP\OD6355 04A.calDate 7/23/01 Time 05 03 09 PM Title c \home\cms\benedil\view\9000-6464 01.CALDate 7/23/01 MOTHERBOARD SCHEMATIC DIAGRAMMCE325 90276245019027624501 MOTHER BOARDMCE325 Title9027624501 MOTHER BOARD MCE325Title DWG. NOTime 05 19 08 PM Title D \TEMP\SD6246 01A.calDate 7/23/01