RTS MCE325 User Instructions
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RTS MCE325 User Instructions

Programmable user station
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U
I
SER
NSTRUCTIONS
M
MCE325
ODEL
P
U
S
ROGRAMMABLE
SER
TATION
9350-6464-00 Rev J, 7/2001

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Summary of Contents for RTS MCE325

  • Page 1 NSTRUCTIONS MCE325 ODEL ROGRAMMABLE TATION 9350-6464-00 Rev J, 7/2001...

  • Page 2: Unpacking And Inspection

    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,...
  • Page 3 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.

  • Page 4: End-User License Agreement For Telex® Software

    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 “SOFT- WARE”) FOR USE WITH THE PRODUCT IN WHICH IT WAS INSTALLED.

  • Page 5: Table Of Contents

    MCE325 Specifications ........
  • Page 6 Unswitched Microphone Output ......... . . 2-11 External DC Power Source .
  • Page 7 Final Assembly, MCE325 (9010-6464-00) ........

  • Page 9: Description & Specifications

    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.

  • Page 10: Front Panel Features

    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.

  • Page 11: Rear Panel Features

    (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.

  • Page 12: Speaker Output

    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.

  • Page 13: Mce325 Specifications

    MCE325 Specifications General Bridging Impedance (to line) Noise Contribution to 200-ohm Line Call Signal Frequency Talk-off Frequency Microphone Preamplifier Maximum Voltage Gain Frequency Response Input Impedance Limiter Range Headphone Amplifier Maximum Voltage Gain Frequency Response Headphone Impedance Output Power Output Voltage Level...

  • Page 14: Connectors

    Carbon Mic Auxiliary Connector Program Inputs Speaker Output Panel Mic MCS325 Specifications The MCS325 is designed for use with MCE325, but may also be used as a general-purpose monitor for program material. Impedance Power Rating Sensitivity Frequency Response Free Air Resonance...
  • Page 15 Figure 1.3 Standard four-channel, two-wire configuration. Figure 1.4 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. Figure 1.5...
  • Page 16 Standard two-channel, four wire configuration. Figure 1.6 Figure 1.7 Multiple interconnected stations in four-channel, two-wire configuration with two channels used for IFB’s. M C E 3 2 5 U s e r I n s t r u c t i o n s...
  • Page 17 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).
  • Page 18 Configuration for an ENG truck using one four-wire intercom channel and two two-wire Figure 1.10 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...
  • Page 19 Figure 1.11 MCE325 button configurations. 1-11...
  • Page 20 1-12 M C E 3 2 5 U s e r I n s t r u c t i o n s...

  • Page 21: Installation

    General 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.

  • Page 22: Intercom Line-Channel Configurations (Ds1-Ds3, J6, J7, J19 & J20)

    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.
  • Page 23 When a two-wire line is connected to channel one and a four-wire line is connected to channel 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 functions and default settings.
  • Page 24 Internal DIP switches, jumpers and level trimmers. Figure 2.2 C S I - 2 0 0 U s e r I n s t r u c t i o n s...

  • Page 25: Front Panel Setup Mode Lock-Out (Ds4)

    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.

  • Page 26: Program Assignment - Ifb Option (J4, J5, J16-J18)

    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.
  • Page 27 Figure 2.3 Mounting configurations.

  • Page 28: Electrical Installation

    Electrical Installation AC Power and Fuse The Model MCE325 is pre-wired for either 115 or 230 VAC operation, and the appropriate fuse is already installed. The MCE325 uses a 0.5A Slo-Blo fuse for 115 volt operation, or a 0.25A Slo- Blo fuse for 230 volt operation.

  • Page 29: Program Inputs, J14 And J15

    Sleeve Common The MCE325 must be internally programmed to assign the program inputs to the intercom lines, headphones, or speaker output (see “Program Assignment”). Program volume to the headphones and speaker is controlled by the PGM VOL control on the front panel.

  • Page 30: Key Outputs - Expanded Ifb Option

    VCP Control Panel to either a four-wire input or a program input of the MCE325; connect the logic contact output of the VCP Control Station to the ISO input of the MCE325 (pin 12 of the auxiliary connector); connect VCP common to pin 11 of the auxiliary connector.

  • Page 31: External Electret Microphone

    The in-phase signal is available at pin 1; the inverted-phase is available at pin 14. External DC Power Source The MCE325 may be powered from an external DC power supply in the 10 to 25 volt range (500 mA minimum).
  • Page 32 Carbon-microphone headset connector: ¼-inch, tip-ring-sleeve phone jack. Carbon-microphone headset connector. Table 2.9 SECTION FUNCTION Carbon microphone Ring Headphone Sleeve Common/ground 2-12 C S I - 2 0 0 U s e r I n s t r u c t i o n s...

  • Page 33: Operation

    When the station is operated in four-channel mode, however, each two-wire intercom line uses only one channel selector button to control both talk and listen, and the MCE325 is pre- programmed so that a channel is activated for both talk and listen when the button is pressed. The...

  • Page 34: Panel Mic/Headset Mic Selection

    It does not affect the program volume on the intercom lines. Front Panel Sidetone Nulling Trimmer Adjustment When the MCE325 is used with two-wire lines, the station operator’s voice signal is not only transmitted onto the intercom lines, but also echoed back into the MCE325 receive circuits. This can result in acoustic feedback when the MCE325 is used with an external speaker.

  • Page 35: Sending And Receiving Call Signals

    If no submenu is selected from the main menu within 12 seconds after program mode activation, NOTE the programming mode will time out, and the MCE325 will return to normal operation. If a submenu is selected, however, the unit will remain in programming mode until intentionally exited.

  • Page 36: Channel Id

    Channel ID The MCE325 can be programmed so that when someone is talking on an intercom channel, the corresponding listen button LED will flicker as they talk to provide a visual indication of which channel is talking. With the Channel ID submenu selected, press each TALK button to select or deselect Channel ID.

  • Page 37: Instant Mic

    Long LED blink (50% on, 50% off): Instant mic on. Reset To restore the original programming, hold down the CH 1 talk button for about two seconds while powering up the MCE325. Table 3.1 Front panel control usage for the various intercom line configurations.
  • Page 38 C S I - 2 0 0 U s e r I n s t r u c t i o n s...

  • Page 39: Maintenance

    Factory support information is located on the first page of this manual. Corrective Maintenance WARNING: Hazardous voltages exist inside the MCE325. Attempting diagnosis, repair, or adjustment with the AC line connected could result in serious injury or death. These servicing instructions are for qualified personnel only.

  • Page 40: Cleaning

    • 400 Hz to 30 kHz bandpass filter with +40 dB of gain Power Supply Test Set a variac to 117 VAC, 60 Hz, and connect the MCE325 to the variac. Observe that each LED blinks on in sequence, and then all LED’s are off.

  • Page 41: Initial Configuration

    Set all internal jumpers and DIP switches as follows: DIP Switches: Set all DIP switches, except DS3, to the default settings listed in Table 2.1. Set DS3 to on. (This places the MCE325 in four-channel mode. Refer to Figure 1.11 for names of buttons in standard four-channel mode.) Jumpers: Set all jumpers, except J24, to the default settings listed in Table 2.2.

  • Page 42: Usmb (Un-Switched Microphone Balanced) Frequency Response And Level Check

    Set the MIC ON button to on. Set all other front panel buttons to off. Check for 13 VDC minimum at the key 1 output. Turn CH 1 TALK on and check for less than 2 VDC at the key 1 output. Repeat steps 3 and 4 for the other channels: CH2 TALK: key 2 out (J22 pin 19) CH3 TALK: key 3 out (J22 pin 7)

  • Page 43: Two-Channel, Four-Wire Mode

    Two-Channel, Four-Wire Mode Remove the 200 ohm terminations from intercom channels 1 through 4. Program the MCE325 to be in two-channel, four-wire mode. (See Table 2.3, configuration 6 for switch settings. See Figure 1.11 for names of buttons in standard two-channel mode.)

  • Page 44: True Sidetone Adjust

    Readjust the generator output level to –45 dBu, 1 kHz. Turn on the MIC ON button. Adjust R37 (sidetone) on the MCE325 main board to obtain 8.7 dBu (2.1 VAC) at the left headphone output. Level and Frequency Response Check, Intercom Channel to Headphone Set all front panel buttons to off.

  • Page 45: Level And Frequency Response Check, Intercom Channel To Speaker

    Level and Frequency Response Check, Intercom Channel to Speaker Set all front panel buttons to off. Set all volume controls to minimum. Connect an 8 ohm load across the speaker output (J27, tip and ring) Connect an AC voltmeter and an oscilloscope across the speaker output. Connect the signal generator to intercom channel 1, and adjust the generator output to –1 dBu, 1 kHz.

  • Page 46: Program B To Right Headphone

    Restore jumper J16 to short pins 1 & 2. Program B to Right Headphone Remove the signal from the PROGRAM A input, and connect it to the PROGRAM B input. Measure the level at the right headphone output (J2, 3 & 5). It should be 1.3 dBu ±2 dBu. (Program volume at maximum.) Set the signal generator to 0 dBu, 100 Hz.

  • Page 47: Ifb A

    IFB A Move the J4 jumper to short pins 1 and 2 (IFB A assigned to channel 3). Remove the signal from PROGRAM B input, and connect it to the PROGRAM A input. Set the signal generator to 0 dBu, 1 kHz. Check the output level across intercom channel 3.

  • Page 48: Panel Mic To Channel Test

    Panel Mic to Channel Test Turn all front panel buttons off. Set all volume controls to minimum. Remove 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.). Set the signal generator to –25 dBu, 1 kHz.

  • Page 49: Mic Kill Transmit Test

    Try turning the MIC ON button on. It should not stay on. Adjust signal generator to –5 dBu at 25.680 kHz. Try turning the MIC ON button on and off. It should turn on and off as usual. Adjust signal generator to –5 dBu at 24.480 kHz. Try turning the MIC ON button on.

  • Page 50: Iso Test

    Remove the 100 ohm resistor. Program Lockout Test Set DIP switch DS4 to on (front panel setup lockout enabled). Press and hold the CALL button for ten seconds, and verify that the MCE325 does not enter program mode. Reset DS4 to off.
  • Page 51 Turn on the SPKR ON button. The meter should read –38 dBu or less. Turn off the SPKR ON button. Noise measurements in the following steps were made using a 400 Hz to 30 kHz bandpass NOTE filter with +40 dB of gain. Turn on the MIC ON switch.
  • Page 52 4-14 C S I - 2 0 0 U s e r I n s t r u c t i o n s...

  • Page 53: Parts Lists

    Packaging Assembly (9000-6464-00) Table 5.1 Reference PD6464 Drawing, Section 6 Item No. Description User Manual, MCE325 User Station Label, Warning Final Assy, MCE325 Assy, 200-ohm Termination Plug Keycap, Blank Keycap, Printed (TALK 3) Keycap, Printed (TALK 4) Keycap, Printed (IFB 1)

  • Page 54: Front Panel Assembly (9020-6261-00)

    Front Panel Assembly (9020-6261-00) Reference AS6261 Drawing, Section 6 Table 5.3 Item No. Description Bezel, MCE325 PC Board Assy, Front Panel, MCE325 9030-6246-00 Bushing Adapter Keycap Stem Knob, Channel Volume, MCE325 Knob, Program Volume, MCE325 Lightpipe, Button Indicator Connector Insert, 6-pin Female (J2)

  • Page 55: Back Panel Assembly (9020-6262-00)

    Nut, Hex Kep, #4-40 Lug, Solder, #16 Shrink Tubing Heatsink Assembly (9020-6324-00) Table 5.5 Reference 9020-6324-00 Drawing, Section 6 Item No. Description Heatsink, Model MCE325 IC LM4752T Adj. Regulatro, 3 Terminal, LM317T 53290000 Insulator Washer, Nylon Shoulder Washer Washer, Compression Screw PH, Cross...
  • Page 56 Reference 9027-6245-01 Drawing, Section 6 Table 5.6 C104 Capacitor, CM, 0.1µF, 50V C105 Capacitor, EL, 100µF, 25V C106 Capacitor, EL, 4.7µf, 25V C107 Capacitor, EL, 4.7µf, 25V C108 Capacitor, EL, 100µF, 25V C109 Capacitor, EL, 1000µF, 25V Capacitor, CM, 0.1µF, 50V C110 Capacitor, CM, 0.1µF, 50V C111...
  • Page 57 Reference 9027-6245-01 Drawing, Section 6 Table 5.6 Capacitor, EL, 10µF, 50V Capacitor, CD, 100pF, 100V Capacitor, CD, 100pF, 100V Capacitor, CM, 0.1µF, 50V Capacitor, CD, 10pF, 500V Capacitor, CM, 0.1µF, 50V Capacitor, EL, 22µF, 50V Capacitor, EL, 47µF, 16V Capacitor, EL, 22µF, 50V Capacitor, CD, 100pF, 100V Capacitor, CD, 100pF, 100V Capacitor, EL, 100µF, 25V...
  • Page 58 Reference 9027-6245-01 Drawing, Section 6 Table 5.6 Capacitor, Mylar, 1nF, 100V Capacitor, EL, 10µF, 50V Capacitor, CD, 100pF, 100V Capacitor, Mylar, 1nF, 100V Capacitor, CM, 0.1µF, 50V Capacitor, EL, 10µF, 50V Capacitor, Mylar, 1nF, 100V Capacitor, EL, 10µF, 50V Capacitor, CD, 100pF, 100V Capacitor, CM, 1nF, 50V Capacitor, Mylar, 1nF, 100V Capacitor, EL, 10µF, 50V...
  • Page 59 Reference 9027-6245-01 Drawing, Section 6 Table 5.6 Diode, 1N4004 Diode, 1N4004 Diode, 1N4004 Diode, 1N914B Diode, 1N914B Diode, 1N914B Diode, 1N914B Diode, 1N4004 Diode, 1N4004 Diode, 1N4004 Diode, 1N914B Diode, 1N914B Diode, 1N914B Diode, 1N4004 Diode, 1N4004 Diode, 1N4004 Diode, 1N4004 #73 SHIELD BEAD #73 SHIELD BEAD #73 SHIELD BEAD...
  • Page 60 Reference 9027-6245-01 Drawing, Section 6 Table 5.6 Transistor, 2N5210 Transistor, 2N5210 Resistor, CF, 1K Ohm, 5%, 1/8W Resistor, MF, 3.01K Ohm, 1%, 1/8W R100 Resistor, CF, 22K Ohm, 5%, 1/8W R101 Resistor, CF, 10K Ohm, 5%, 1/8W R104 Trimpot, 10K Ohm, Linear R105 Resistor, MF, 60.4K Ohm, 1%, 1/8W R106...
  • Page 61 Reference 9027-6245-01 Drawing, Section 6 Table 5.6 R170 Resistor, CF, 10K Ohm, 5%, 1/8W R171 Resistor, CF, 10K Ohm, 5%, 1/8W R172 Resistor, MF, 201 Ohm, 1%, 1/8W R173 Resistor, CF, 100K Ohm, 5% 1/8W R174 Resistor, MF, 201 Ohm, 1%, 1/8W R175 Resistor, CF, 100K Ohm, 5% 1/8W R176...
  • Page 62 Reference 9027-6245-01 Drawing, Section 6 Table 5.6 R267 Resistor, MF, 201 Ohm, 1%, 1/8W R268 Resistor, CF, 200 Ohm, 5%, 1/8W R269 Resistor, CF, 10K Ohm, 5%, 1/8W Resistor, CF, 200 Ohm, 5%, 1/8W Resistor, CF, 22K Ohm, 5%, 1/8W Resistor, CF, 5.1M Ohm, 5%, 1/8W Resistor, CF, 100 Ohm, 5%, 1/8W Resistor, CF, 100K Ohm, 5% 1/8W...
  • Page 63 Reference 9027-6245-01 Drawing, Section 6 Table 5.6 Resistor, CF, 22K Ohm, 5%, 1/8W Resistor, CF, 22K Ohm, 5%, 1/8W Resistor, CF, 22K Ohm, 5%, 1/8W Resistor, MF, 301 Ohm, 1%, 1/8W Resistor, CF, 10K Ohm, 5%, 1/8W Trimpot, 10K Ohm, Linear Resistor, MF, 60.4K Ohm, 1%, 1/8W Resistor, MF, 20K Ohm, 1%, 1/8W Resistor, MF, 60.4K Ohm, 1%, 1/8W...
  • Page 64 Reference 9027-6245-01 Drawing, Section 6 Table 5.6 IC, Dual Low-noise Op-Amp, NE5532N IC, Dual Low-noise Op-Amp, NE5532N IC, Dual Low-noise Op-Amp, TLO76 IC, Dual Low-noise Op-Amp, TLO77 IC, Analog Switch, CD4053BE IC, Analog Switch, CD4053BE IC, Analog Switch, CD4053BE IC, Dual Low-noise Op-Amp, TLO78 IC, Dual Low-noise Op-Amp, NE5532N IC, Audio Amp, LM386 IC, Audio Amp, LM387...

  • Page 65: Pc Board Assembly, Front Panel (9030-6246-00)

    PC Board Assembly, Front Panel (9030-6246-00) Reference AS6246 Drawing, Section 6 Table 5.7 Ref No. Description R1-R3 Pot, 10K Ohm, Audio LED, Super Bright, Red DS1-DS8 LED, Super Bright, Yellow 1801002200 S1-S8 Keyswitch, No LED Connector RTS Part No. 1406003901 1801001900 1911004300 2006009600...
  • Page 66 5-14 C S I - 2 0 0 U s e r I n s t r u c t i o n s...

  • Page 67: Diagrams

    E C T I O N IAGRAMS HAPTER...
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  • Page 82 TL072 R104 100pF 10K TRIMPOT VM VOX REC CHK. THESE DRAWINGS AND SPECIFICATIONS ARE THE PRPOERTY OF TELEX COMMUINCATIONS, INC.AND DATE SCALE SHALL NOT BE REPRODUCED, COPIED, OR USED 7/15/01 FOR ANY PURPOSE WITHOUT EXPRESS WRITTEN CONSENT. DO NOT SCALE DRAWING...
  • Page 83 KEY3 KEY2 KEY1 HP COM MIC HI MIC LO CHS GND PM HI PM COM HP L (SHT1,8D) HP R (SHT1,8C) REAR PANEL SPKR JACK MN-114B NOTES: SEE SHEET 3 OF 3 Title PAGE MOTHER BOARD MCE325 DWG. NO. 9027624501...
  • Page 84 SPKR ON PANEL MIC FRONT CALL LIGHT PANEL CH 4 SWITCHES CH 3 CH 2 CH 1 RP9I (SHT1,8D) (SHT2,1D) REM MIC CARB MIC (SHT1,7C) (SHT2,1D) SPKR MUTE (SHT2,1D) K40-8S VOX REC (SHT1,4A) Title PAGE MOTHER BOARD MCE325 DWG. NO. 9027624501...
  • Page 85 Date: 7/23/01 Time : 05:19:08 PM Title: D:\TEMP\SD6246_01A.cal...

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