Manuals / Telex / Home Audio / Stereo Amplifier

Telex MCE325 manual Panel Mic to Channel Test, Carbon Mic to Channel Test, VOX Test

Models: MCE325

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Panel Mic to Channel Test

Panel Mic to Channel Test

1Turn all front panel buttons off. Set all volume controls to minimum.

2Remove the signal from the Four-Wire B input and reconnect it to the panel mic input (J28 tip and ring, it is easiest to connect to the back of the connector.).

3Set the signal generator to –25 dBu, 1 kHz.

4Turn on the CH 1 TALK, MIC ON and PANEL MIC buttons.

5Check the channel 1 output. It should be –0.9 dBu ±2 dBu.

Carbon Mic to Channel Test

1Turn off the PANEL MIC and MIC ON buttons. (Only the CH 1 TALK LED should be on.)

2Connect a 470 ohm resistor across the CARBON MIC HEADSET jack (J3 tip and ring). The MIC ON LED should turn on.

3Remove the signal from the panel mic input, and reconnect it to the CARBON MIC HEADSET jack.

4Set the signal generator to 11.2 dBu, 1 kHz.

5Check the channel 1 output. It should be –0.9 dBu ±2 dBu.

6Remove the 470 ohm resistor from the carbon mic input.

VOX Test

1Remove the signal from the CARBON MIC HEADSET jack, and reconnect it to the DYN MIC HEADSET jack mic input (J2 pins 1 & 2).

2Set the generator to –45 dBu, 1 kHz.

3Set DIP switch DS8 to the on position (VOX enabled), and note that the MIC ON LED turns on.

4Adjust the signal generator output level to zero, and note that the MIC ON LED turns off.

5Reset DS8 to off.

Mic Kill Receive Test

1Set all buttons to off.

2Remove the signal from the DYN MIC HEADSET jack mic input, and reconnect it to intercom channel 1.

3Adjust signal generator to –5 dBu, 24 kHz (check frequency with frequency counter).

4Set the MIC ON button to on.

5Activate the CH 1 TALK button. The MIC ON LED should turn off.

6Attenuate the signal input by 20 dB. Try turning on the MIC ON button. It should not turn on.

7Attenuate the signal an additional 10 dB. Try turning on the MIC ON button. It should turn on.

8Adjust signal generator to –5 dBu at 22.320 kHz.

9Try turning the MIC ON button on and off. It should turn on and off as usual.

10Adjust the signal generator to –5 dBu at 23.520 kHz.

4-10C 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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Telex MCE325 manual Panel Mic to Channel Test, Carbon Mic to Channel Test, VOX Test, Mic Kill Receive Test

Contents

MODEL MCE325 USER INSTRUCTIONSPROGRAMMABLE USER STATION WARRANTY INFORMATION PROPRIETARY NOTICECOPYRIGHT NOTICE UNPACKING AND INSPECTIONRETURN SHIPPING INSTRUCTIONS End-UserLicense Agreement for Telex Software TABLE OF CONTENTS Description & SpecificationsInstallation Maintenance OperationParts Lists DiagramsPage DESCRIPTION & SPECIFICATIONS FeaturesDescription GeneralFront Panel Features Volume ControlsConnections, Inputs and Outputs Channel Selector and Operation ButtonsRear Panel Features Intercom LinesExternal Program Input Power Mounting ConfigurationAuxiliary Connector ProgrammingMCE325 Specifications Power and MechanicalMicrophone Preamplifier Headphone AmplifierMCS325 Specifications ConnectorsFigure 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 INSTALLATION Internal Programming and AdjustmentsGeneral S E C T I O NSwitch Number Switch FunctionDefault Setting Figure 2.1 Top cover removalTable 2.2 Jumper functions and default settings Default SettingJumper 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 Front Panel Setup Mode Lock-outDS4 ISO DS5Remote Talk-offDS7 VOX DS8Mechanical Installation Headphone Sidetone Trimmer Adjustment R37Speaker Dim Adjustment R157 Program Assignment - IFB Option J4, J5, J16-J18Figure 2.3 Mounting configurations Electrical Installation AC Power and FuseConnector Pin-outs Four-wireOutput TerminationAuxiliary Connector, J22 Four-WireChannel A and B InputProgram Inputs, J14 and J15 External Speaker, J27Remote Microphone Switch Key outputs - Expanded IFB OptionISO Connection External HeadsetFront Panel Headset Connections Unswitched Microphone OutputExternal DC Power Source External Electret MicrophoneTable 2.9 Carbon-microphoneheadset connector SECTIONFUNCTION Carbon microphoneLED Indicators OPERATIONGeneral Operating InstructionsVolume Adjustment Front Panel Sidetone Nulling Trimmer AdjustmentPanel Mic/Headset Mic Selection Microphone On/OffSending and Receiving Call Signals Using the Talk-OffFeatureActivating Setup Mode Menu Selection/Ending SetupCall Disable Latch DisableChannel ID Four-channelListenReset Instant Mic3-6 C S I - 2 0 0 U s e r I n s t r u c t i o n s MAINTENANCE Preventive MaintenanceCorrective Maintenance AccessTest and Adjustment Procedures CleaningPower Supply Test Test EquipmentInitial Configuration Keying Output TestFour-Channel, Two-WireMode Frequency Response and Level Check, Mic to LineSidetone Null Test and Adjustment Two-Channel, Four-WireModeTrue Sidetone Adjust Program A to Left Headphone IFB Test Program B to Right HeadphoneProgram to Speaker IFB BFour-WireA Input to Left Headphone Four-WireB input to Right HeadphoneIFB A Panel Mic to Channel Test Carbon Mic to Channel TestVOX Test Mic Kill Receive TestMic Kill Transmit Test Call Transmit TestCall Receive Test Remote Mic Switch Test ISO TestProgram Lockout Test Noise Checks15Turn all buttons off Page PARTS LISTS Packaging AssemblyFinal Assembly, MCE325 S E C T I O NFront Panel Assembly Table 5.3 Reference AS6261 Drawing, SectionItem No DescriptionBack Panel Assembly Heatsink 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 PC Board Assembly, Front Panel Table 5.7 Reference AS6246 Drawing, SectionRef No DescriptionPage DIAGRAMS S E C T I O N6-2 C 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\AS6246 01B.calTime 05 20 45 PM Title D \TEMP\AS6245 01D.cal Time 05 27 24 PMDate 7/23/01 Title D \TEMP\AS6261 01C.cal Time 05 21 25 PMDate 7/23/01 Title D \TEMP\AS6262 01C.cal Time 05 22 16 PMDate 7/23/01 Date 7/19/01 Time 02 05 07 PMTitle C \home\cms\benedil\view\9020-6324 01.DWG Title D \TEMP\AS6464 01G.dwg Time 05 23 05 PMDate 7/23/01 Title D \TEMP\BD6464 01A.cal Time 05 23 33 PMDate 7/23/01 Title D \TEMP\IS6718 01A.cal Time 05 24 13 PMDate 7/23/01 Title D \TEMP\OD6355 01A.cal Time 05 24 51 PMDate 7/23/01 Title D \TEMP\OD6355 02A.cal Time 05 25 30 PMDate 7/23/01 Title D \TEMP\OD6355 03A.cal Time 05 26 07 PMDate 7/23/01 Title D \TEMP\OD6355 04A.cal Time 05 26 42 PMDate 7/23/01 Title c \home\cms\benedil\view\9000-6464 01.CAL Time 05 03 09 PMDate 7/23/01 SCHEMATIC DIAGRAM MOTHERBOARDMCE325 9027624501MOTHER BOARD 9027624501MCE325 TitleMOTHER BOARD MCE325 9027624501Title DWG. NOTitle D \TEMP\SD6246 01A.cal Time 05 19 08 PMDate 7/23/01