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Pacific Research BMX-III-18 Operation And Technical Manual

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BMX-III
Broadcast Console
BMX-18 Mainframe: PR&E # 99-260-3CU
BMX-22 Mainframe: PR&E # 99-260-4CU
BMX-26 Mainframe: PR&E # 99-260-5CU
BMX-30 Mainframe: PR&E # 99-260-610U
BMX-34 Mainframe: PR&E # 99-260-7CU
Operations
&
Technical
Manual
PR&E Document #75-10
P A C I F I C
R E S E A R C H
&
E N G I N E E R I N G
C O R P O R A T I O N
2070 Las Palmas Drive • Carlsbad, CA 92009 USA • Tel: 760.438.3911 FAX: 760.438.9277 • E-Mail: info@pre.com • Internet: http://www.pre.com

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Summary of Contents for Pacific Research BMX-III-18

  • Page 1 BMX-III Broadcast Console BMX-18 Mainframe: PR&E # 99-260-3CU BMX-22 Mainframe: PR&E # 99-260-4CU BMX-26 Mainframe: PR&E # 99-260-5CU BMX-30 Mainframe: PR&E # 99-260-610U BMX-34 Mainframe: PR&E # 99-260-7CU Operations & Technical Manual PR&E Document #75-10 P A C I F I C R E S E A R C H &...
  • Page 2 Engineering Department, comment information relating to any change may also be included on this page. Page No. Revision Comments Corporate Name Change 4,5,78,89 Standard output level is now 90,100,101 +4 dBu instead of +8 dBu. References in text updated. Files changed to PC format. Text & graphics updated. PACIFIC RESEARCH & ENGINEERING REVISION C...

  • Page 3: Table Of Contents

    Slate/Talkback/Test Oscillator Remote Control Module Internal Option Switches 2.9.1 Microphone Input Module Option Switches 2.9.2 Stereo Line Input Module Option Switches 2.9.3 Control Room Monitor Module Option Switch 2.9.4 Two-Studio Monitor Module Option Switch PACIFIC RESEARCH & ENGINEERING REVISION C...
  • Page 4 Stereo Line Output Amplifier 4.4.1 Function 4.4.2 Circuitry Control Room Monitor Module 4.5.1 Function 4.5.2 Circuitry Two-Studio Monitor Module 4.6.1 Function 4.6.2 Circuitry Monaural Line Output Amplifier 4.7.1 Function 4.7.2 Circuitry Monaural Output/Telco Mix Module PACIFIC RESEARCH & ENGINEERING REVISION C...
  • Page 5 Talkback/Intercom Module MAINTENANCE AND ALIGNMENT Routine Maintenance 6.1.1 Checking Power Supply Voltages 6.1.2 Lamp Replacement 6.1.3 Button Replacement 6.1.4 Collet Knob Removal Troubleshooting (Module Removal) Level Alignment Tool Kit Spare Parts Kit Replacement Parts PACIFIC RESEARCH & ENGINEERING REVISION C...
  • Page 6 7.26 Remote Line Selector Mother Board Schematic 7.27 Console Wiring (Edge Connector Layout) 7.27.1 Microphone Input Module Audio 7.27.2 Stereo Line Input Module Audio 7.27.3 Input Module Logic 7.27.4 Program Amplifier Output 7.27.5 Audition Amplifier Output 7.27.6 Utility Amplifier Output PACIFIC RESEARCH & ENGINEERING REVISION C...
  • Page 7 8.6.3 TD-2 Digital Clock 8.6.4 TD-171 Digital Slave Clock 8.6.5 DT-4 Digital Timer 8.6.6 Timer Control Panel 8.6.7 PPM Buffer Amplifier 8.6.8 Power Supply Coupler Unit 8.6.9 TCI-2A Cartridge Interface 8.6.10 CI-2 Cartridge Interface PACIFIC RESEARCH & ENGINEERING REVISION C...
  • Page 8 8.6.17 #99-464 Console To TI-2 Interface Cable 8.6.18 #99-465 Console To CI-2 Interface Cable 8.6.19 #99-453 Control Cable, 9-Pin Male To Male 8.6.20 #99-454 Control Cable, 12-Pin Male To Male 8.6.21 #99-455 Control Cable, 24-Pin Male To Male PACIFIC RESEARCH & ENGINEERING REVISION C...

  • Page 9: General Information

    BMX III’s features, its specifications and warranty information. 1.1 INTRODUCTION Congratulations on your decision to join the growing ranks of Pacific Research & Engineering Corporation (PR&E) broadcasters. PR&E is in the business of supplying the finest audio systems to the world’s leading broadcast facilities.
  • Page 10 The third output (+12 volts) is used to power the logic control circuitry, lamps and relays. The fourth output (+ 48 volts) is for the phantom powering of condenser microphones connected to the Microphone Input Modules. PACIFIC RESEARCH & ENGINEERING REVISION C...

  • Page 11: Specifications

    Source Impedance 30 ohms, unbalanced. Output Level 0 dBu nominal, +20 dBu maximum. Headphone Outputs: Load Impedance 45 ohms or greater. Source Impedance Less than 4 ohms. Output Level 0 dBu nominal, +20 dBu maximum. PACIFIC RESEARCH & ENGINEERING REVISION C...
  • Page 12 Line Input to Program Output Less than 0.008%, 20 Hz to 20 kHz, +4 dBu input, +4 dBu output into 600 ohm load, 80 kHz meter bandwidth; less than 0.01 at 1 kHz, +28 dBu output. PACIFIC RESEARCH & ENGINEERING REVISION C...
  • Page 13 20 kHz measurement bandwidth; the use of a meters with 30 kHz bandwidth will result in a noise measurement increase of approximately 1.7 dB. Pacific Research & Engineering Corporation reserves the right to change specifications without notice or obligation. PACIFIC RESEARCH & ENGINEERING...

  • Page 14: Warranty Information

    This product carries a manufacturer’s warranty which is subject to the following guidelines and limitations: Except as expressly excluded hereinafter, Pacific Research & Engineering Corporation (“Seller”) warrants equipment of its own manufacture against faulty workmanship or the use of defective materials for a period of one (1) year from date of shipment to Buyer. The liability of the Seller under this Warranty is limited to replacing, repairing or issuing credit (at the Seller’s discretion) for any equipment, provided that Seller is promptly notified in...

  • Page 15: Installation

    32" 36-1/2" 36-3/4" BMX III-14 38" BMX III-18 42-1/2" 42-3/4" 44" 24-7/8" BMX III-22 50" 48-1/2" 48-3/4" 54-3/4" BMX III-26 56" 54-1/2" BMX III-30 60-1/2" 60-3/4" 66-3/4" BMX III-34 66-1/2" FIGURE 2.1 CONSOLE DIMENSIONS PACIFIC RESEARCH & ENGINEERING REVISION C...

  • Page 16: Cable Preparation

    NOTE: It is very important to sleeve the shield drain wire and the shield (at cable ends) with heat-shrink tubing. This is the only means of assuring an installation according to recommended grounding procedures. PACIFIC RESEARCH & ENGINEERING REVISION C...
  • Page 17 If a pin is inserted in the wrong connector position, or it is desired to make a circuit change, use the connector pin extractor tool (PR&E #70-4) to release the pin and press it out of the connector housing. PACIFIC RESEARCH & ENGINEERING REVISION C...

  • Page 18: Mainframe Configuration

    NOTE: The “optional” module positions labeled A through E are pre-wired with 24-pin logic cables. These cables are routed to corresponding rear panel OPTION cutouts, as defined in Figure 2.5. INPUT MODULES 1 - 14 FIGURE 2.3 CONTROL PANEL LAYOUT PACIFIC RESEARCH & ENGINEERING REVISION C...

  • Page 19: Meter Panel

    NOTE: Blank filler panels are supplied for any unused clock or timer position. BMX III-10 BMX III-14 AUXILIARY PROGRAM CLOCK TIMER LEFT RIGHT LEFT RIGHT BMX II I PACIFIC RESEARCH & ENGINEERING Talkback Microphone BMX III-18 BMX III-22 AUXILIARY PROGRAM AUDITION CLOCK TIMER LEFT RIGHT LEFT...

  • Page 20: Connector Panel

    NOTE: Audio and logic pin assignment information is provided in Figure 2.6 as a quick reference only. It is highly recommended that the complete information contained in Section 2.7 be used when connecting the console. PACIFIC RESEARCH & ENGINEERING REVISION C...
  • Page 21 WARNING TALLY Microphone B Logic Common -No Connection- " DIM Control Room Monitors Patch Send PATCH MUTE Control Room Monitors FIGURE 2.4 CONNECTOR PANEL LAYOUT -No Connection- " Patch Return " -No Connection- " PACIFIC RESEARCH & ENGINEERING REVISION C...

  • Page 22: Grounding And Shielding

    The third pin “U-ground” on the power connector must be left intact and connected to a properly installed three way AC outlet. For safety, the “U-ground” wire is connected to the chassis of the power supply and the cores of the power transformers. PACIFIC RESEARCH & ENGINEERING REVISION C...

  • Page 23: Patch Point Connection

    The level at all patch points is -10 dBu nominal. This level was determined to provide optimum headroom within the console as well as a good compatibility match with currently available processing equipment. See Section 2.7 for PATCH connector pin assignment. PACIFIC RESEARCH & ENGINEERING REVISION C...

  • Page 24: Audio And Logic Connection

    The BMX III uses “common” or “ground” switching for all of its control inputs, thus preventing the possibility of defective remote controls shorting out the logic power supply. PACIFIC RESEARCH & ENGINEERING REVISION C...
  • Page 25 An open collector that provides a connection to Logic Common when activated. Control Inputs: Control A line above the word indicates that the function is activated when a connection to Logic Common is made. PACIFIC RESEARCH & ENGINEERING REVISION C...

  • Page 26: Microphone Input Module Connection

    10 11 12 NOTES: A) A input logic is connected to LOGIC-A; B input logic is connected to 13 14 15 LOGIC-B. B) Consult Section 2.8.1 when connecting Microphone Input Module INPUT - # remote controls. PACIFIC RESEARCH & ENGINEERING REVISION C...

  • Page 27: Stereo Line Input Module Connection

    NOTES: 13 14 15 A) A input logic is connected to LOGIC-A; B input logic is connected to LOGIC-B. B) Consult Section 2.8.2 when connecting Stereo Line Input Module INPUT - # remote controls. PACIFIC RESEARCH & ENGINEERING REVISION C...

  • Page 28: Stereo Line Output Amplifier Connection

    Patch Returns. If no external processing or patch bay equipment is connected, a mating connector with jumpers 10 11 12 from pins #2 to #8, #3 to #9, #5 to #11 and #6 to #12 must be installed. OUTPUT NAME PACIFIC RESEARCH & ENGINEERING REVISION C...

  • Page 29: Monitor Module Input Connection

    INPUT 6 Input 6/Right " INPUT 6 Input 7/Left INPUT 7 Input 7/Right " Input 8/Left INPUT 8 Input 8/Right " INPUT 7 Input 9/Left INPUT 9 Input 9/Right " INPUT 8 INPUT 9 PACIFIC RESEARCH & ENGINEERING REVISION C...

  • Page 30: Control Room Monitor Module Connection

    Function Pin Number Logic Common Logic +12 VDC TALKBACK MUTE WARNING TALLY Logic Common DIM Control Room Monitors MUTE Control Room Monitors NOTE: Consult Section 2.8.3 when connecting Control Room Monitor Module remote controls. PACIFIC RESEARCH & ENGINEERING REVISION C...

  • Page 31: Two-Studio Monitor Module Connection

    10 11 12 Function Pin Number Logic Common LOGIC Logic +12 VDC TALKBACK MUTE WARNING TALLY Logic Common DIM Studio Monitors MUTE Studio Monitors NOTE: Consult Section 2.8.4 when connecting Two-Studio Monitor Module remote controls. PACIFIC RESEARCH & ENGINEERING REVISION C...

  • Page 32: Monaural Line Output Amplifier Connection

    " MONO/SEND METERS NOTES: A) The Main and Auxiliary Outputs are balanced. B) Monaural and Send Meter Source signals are provided for connection to a Meter Switcher Module input, if desired. 10 11 12 PACIFIC RESEARCH & ENGINEERING REVISION C...

  • Page 33: Telco Mix Module Connection

    NOTE: When "off-air" Telco monitoring facilities are desired, these Direct Outputs should be continuous (reference Section 2.9.2). This allows the Telco system to be fed caller audio regardless of the ON/ OFF status of the caller's Stereo Line Input Module. PACIFIC RESEARCH & ENGINEERING REVISION C...

  • Page 34: Send And Return Module Connection

    Return ON TALLY LOGIC Return OFF TALLY -No Connection- -No Connection- -No Connection- 10 11 12 -No Connection- 13 14 15 -No Connection- SEND/RETURN NOTE: Consult Section 2.8.5 when connecting Send And Return Module remote controls. PACIFIC RESEARCH & ENGINEERING REVISION C...
  • Page 35 Pin Number Logic Common Logic +12 VDC TALK to Studio-1 TALK to Studio-2 TALK to Control Room -No Connection- -No Connection- TALK -No Connection- NOTE: Consult Section 2.8.6 when connecting Slate/Talkback/Test Oscillator Module remote controls. PACIFIC RESEARCH & ENGINEERING REVISION C...

  • Page 36: Meter Switcher Module Connection

    B) On BMX III-10 and 14 mainframes, Input 4 will be pre-wired for AUDITION metering and Input 5 will be pre-wired for UTILITY INPUT-5 metering. The INPUT-4 and INPUT-5 connectors will not be present. PACIFIC RESEARCH & ENGINEERING REVISION C...

  • Page 37: Remote Line Selector Module Connection

    INPUTS 9+10 INPUTS 9+10 Input 9/Right " Input 10/Left " Input 10/Right " Output 1/Left OUTPUTS 1+2 10 11 12 Output 1/Right " Output 2/Left " OUTPUTS 1+2 Output 2/Right " 10 11 12 PACIFIC RESEARCH & ENGINEERING REVISION C...

  • Page 38: Timer Control Connection

    BMX SERIES III CONSOLE 2.7.13 Timer Control Connection TIMER CONTROL LOGIC PIN ASSIGNMENT Function Pin Number HOLD Logic Common RESET START STOP NOTE: These output commands are provided for the control of external "slave" timers. PACIFIC RESEARCH & ENGINEERING REVISION C...

  • Page 39: Module Remote Control Capabilities

    All button switches except PRIVACY are momentary-action (the PRIVACY button switch is maintained-action. Lamps are 12-14 volt, 80 mA. When COUGH, TALK TO and PRIVACY tallies are connected as shown above, switch lamps will be illuminated at all times. PACIFIC RESEARCH & ENGINEERING REVISION C...

  • Page 40: Stereo Line Input Module Remote Control

    RECORD OR FAST WIND LAMP 1N914 READY STOP LAMP NOTES: Button switches are momentary-action. Lamps are 12-14 volt, 80 mA. Relays are 12 volt DC, 100 mA maximum. Opto-isolators are Motorola MCT-2 or equivalent. PACIFIC RESEARCH & ENGINEERING REVISION C...

  • Page 41: Control Room Monitor Module Remote Control

    Module. Typical applications include equipping the Control Room door with a “door open” switch, or a telephone set with an “off-hook” switch to automatically dim the Control Room speakers whenever the door opens or the telephone is picked up. PACIFIC RESEARCH & ENGINEERING REVISION C...
  • Page 42 MUTE command. The C/R WARNING tally is a 12 volt DC, 150 mA maximum, source output for connection to a magnetic or solid-state relay unit for driving the Control Room entry warning light(s). PACIFIC RESEARCH & ENGINEERING REVISION C...

  • Page 43: Two-Studio Monitor Module Remote Control

    Typical applications include equipping the Studio door with a “door open” switch, or a telephone set with an “off-hook” switch to automatically dim the Studio speakers whenever the door opens or the telephone is picked up. PACIFIC RESEARCH & ENGINEERING REVISION C...
  • Page 44 MUTE Command. The STUDIO WARNING tally is a 12 volt DC, 150 mA maximum, source output for connection to a magnetic or solid-state relay unit for driving the Studio entry warning light(s). PACIFIC RESEARCH & ENGINEERING REVISION C...

  • Page 45: Send And Return Module Remote Control

    LOGIC COMMON NOTES: Button switches are momentary-action. Lamps are 12-14 volt, 80 mA. SEND-1 and SEND-2 remote ON/OFF control inputs can be momentary- or maintained-action, as determined by module internal option switches (reference Section 2.9.5). PACIFIC RESEARCH & ENGINEERING REVISION C...

  • Page 46: Slate/Talkback/Test Oscillator Remote Control

    TALK TO EXTERNAL SLATE LOGIC +12 VDC LOGIC COMMON NOTES: Button switches are momentary-action. Lamps are 12-14 volt, 80 mA. When tallies are connected as shown above, switch lamps will be illuminated at all times. PACIFIC RESEARCH & ENGINEERING REVISION C...
  • Page 47 The TALKBACK control output is a current-sinking open collector, which is active (low) whenever the external location is receiving Talkback from another location. Typical applications include keying a two–way transmitter or dimming an external monitor. PACIFIC RESEARCH & ENGINEERING REVISION C...

  • Page 48: Module Internal Option Switches

    Assigning an input to more than one location will disable the module ON circuitry. Switch S7 sets whether the module’s Direct Output follows the ON/OFF status of the module or has continuous audio output. PACIFIC RESEARCH & ENGINEERING REVISION C...
  • Page 49 Switch 207 is an eight-station switch that assigns the microphone to its own location (Control Room, Studio-1, Studio-2, External) to enable the correct monitor mute function for that location. This also enables Talkback from that location to all other locations. PACIFIC RESEARCH & ENGINEERING REVISION C...

  • Page 50: Stereo Line Input Module Option Switches

    Studio-2 on the A and/or B inputs (typically only used when a preamplified microphone is connected to the module). S200-4 and S200-8 separately enable the timer reset function for each input. When closed the console timer resets at module ON. PACIFIC RESEARCH & ENGINEERING REVISION C...
  • Page 51 Ready Logic coming from a peripheral device. This allows the OFF lamp to function as a “ready indicator,” to easily alert the operator to the status of the cart machine, tape player, etc. connected to the module. PACIFIC RESEARCH & ENGINEERING REVISION C...

  • Page 52: Control Room Monitor Module Option Switch

    Control Room is talking to another location. Switch S200-3 allows the Talkback circuitry to be assigned to the Selector Output. The monitor feed to this direct output will be dimmed by 10 dB while Talkback is inserted at unity level. PACIFIC RESEARCH & ENGINEERING REVISION C...
  • Page 53 MODE 1: Stereo Cue is fed to left and right headphones, while source monitor is cut off. MODE 2: Cue is summed to the right headphone, source monitor is summed to left headphone. AUTO-CUE PACIFIC RESEARCH & ENGINEERING REVISION C...

  • Page 54: Two-Studio Monitor Module Option Switch

    Studio-1. Closing S202-2 causes the Studio-2 dim function to block incoming Talkback signals to Studio-2. Since the dim function is the result of the studio talking to another location, this function prevents other locations from talking to the studio while it is talking. PACIFIC RESEARCH & ENGINEERING REVISION C...

  • Page 55: Telco Mix Option Switch

    NOTE: This option switch is also present on the Monaural Output/Telco Mix/Send And Return Module (PR&E #99-266). S601, Audio Assignment Selector Output Function UP: Filter inserted. Telco-1 DOWN: Filter bypassed. UP: Filter inserted. Telco-2 DOWN: Filter bypassed. PACIFIC RESEARCH & ENGINEERING REVISION C...

  • Page 56: Send And Return Module Option Switches

    When momentary-action is selected for the local and/or remote ON/OFF buttons, Send-1 is active only as long as the button is held depressed. The momentary-action function may be desired when using Sends for special effects applications. PACIFIC RESEARCH & ENGINEERING REVISION C...
  • Page 57 The illustration below provides the location of this switch, and defines its function. S1, Audio Assignment Selector Function C1 (Up): Line level External input. C2 (Down): Microphone level External input. PACIFIC RESEARCH & ENGINEERING REVISION C...

  • Page 58: Meter Switcher Module Option Switch

    CUE and SOLO. The illustration provides the location of this switch, and defines its function. ¥ S6, AUX Meter Display Priority Function ON (CLOSED): SOLO has meter priority. OFF (OPEN): CUE has meter priority. PACIFIC RESEARCH & ENGINEERING REVISION C...

  • Page 59: Operation

    In addition, the ON button may be optionally set to provide a momentary cough function while held depressed (reference Section 2.9.1). • The OFF button turns the module off and cancels the muting commands. PACIFIC RESEARCH & ENGINEERING REVISION C...

  • Page 60: Microphone Input Module With Sends

    In addition, the ON button may be optionally set to provide a momentary cough function while held depressed (reference Section 2.9.1). SOLO • The OFF button turns the module off and cancels the muting commands. PACIFIC RESEARCH & ENGINEERING REVISION C...

  • Page 61: Stereo Line Input Module

    The OFF button turns the module off and initiates machine stop control commands as set during installation. The OFF lamp may be set to act as a machine ready status indicator, see Section 2.9.2. PACIFIC RESEARCH & ENGINEERING REVISION C...

  • Page 62: Stereo Line Input Module With Sends

    The OFF button turns the module off and initiates machine stop control commands as set during installation. The OFF lamp may be set to act as a machine ready status indicator, see Section 2.9.2. PACIFIC RESEARCH & ENGINEERING REVISION C...

  • Page 63: Stereo Line Output Amplifier

    3.5 STEREO LINE OUTPUT AMPLIFIER • The recessed LEFT and RIGHT GAIN TRIM controls set the gain of the line output distribution amplifiers. These controls are for engineering personnel only. LEFT GAIN TRIM RIGHT PACIFIC RESEARCH & ENGINEERING REVISION C...

  • Page 64: Control Room Monitor Module

    Cue using the selected Auto-Cue Mode. Refer to Section 2.9.3 for information on the two Auto-Cue Modes. • MONITOR controls the volume of the Control Room monitors. MONITOR CONTROL ROOM PACIFIC RESEARCH & ENGINEERING REVISION C...

  • Page 65: Two-Studio Monitor Module

    TALK OVER MUTE is an alternate-action switch which, when engaged (down), allows communication to Studio-2 even when there is a live microphone in the studio and the studio speakers are muted. MONITOR • MONITOR controls the volume of the Studio-2 monitors. STUDIO-2 PACIFIC RESEARCH & ENGINEERING REVISION C...

  • Page 66: Monaural Line Output Amplifier

    This control is for engineering personnel only. • The MONO SOURCE buttons select the monaural output source. Any combination of the summed PROGRAM, AUDITION and UTILITY output buses can be selected. MONO SOURCE PACIFIC RESEARCH & ENGINEERING REVISION C...

  • Page 67: Monaural Output/Telco Mix Module

    Input Module with the Telco input to the UTL bus. Select only UTL on the SEND TO TELCO switches. Select which callers to add to the base mix using the TELCO-1 and TELCO-2 INPUT assignment buttons. PACIFIC RESEARCH & ENGINEERING REVISION C...

  • Page 68: Send And Return Module

    The alternate-action SOLO button routes the stereo Return audio to the console SOLO monitoring and metering systems. The SOLO button illumi- nates to tally its ON status. ∞ • The alternate-action ON button turns the Return audio ON and OFF. SOLO RETURN PACIFIC RESEARCH & ENGINEERING REVISION C...

  • Page 69: Monaural Output/Telco Mix/Send And Return Module

    AU D U T L OUTPUT S U M R I G H T L E F T S T E R E O I N P U T M O D E SOLO RETURN PACIFIC RESEARCH & ENGINEERING REVISION C...

  • Page 70: Slate/Talkback/Test Oscillator Module

    Talkback microphone to the buses selected by the OUTPUT assignment buttons. STUDIO • The three Talkback buttons (STUDIO 1, STUDIO 2, EXT) provide commu- nications to two Studios and an External location. Multiple buttons can be STUDIO pressed for simultaneous communications. PACIFIC RESEARCH & ENGINEERING REVISION C...

  • Page 71: Meter Switcher Module

    Cue level is displayed on the Auxiliary meters. C U E NOTE: SOLO or CUE metering priority is set by an internal option switch M E T E R (see Section 2.9.8). S W I T C H E R PACIFIC RESEARCH & ENGINEERING REVISION C...

  • Page 72: Remote Line Selector Module

    A ten-station switchbank selects one input source from among the ten Remote Inputs. The stereo output from each RLS module is then routed to an Input module, tape recorder, station playback system, etc. NOTE: Legend strip dimensions are provided in Section 2.1. PACIFIC RESEARCH & ENGINEERING REVISION C...

  • Page 73: Timer Control Panel

    START • START starts the timer from the displayed stop time. STOP • STOP stops the timer displaying the final running time count. NOTE: The Timer Control Panel schematic is located in Section 8.6.6. PACIFIC RESEARCH & ENGINEERING REVISION C...

  • Page 74: Equipment Description

    AUDITION and AUXILIARY). The Utility bus is metered on the Auxiliary meters, as selected by the Meter Switcher module. The BMX III-26, BMX III-30 and BMX III-34 are equipped with four sets of stereo meters (PROGRAM, AUDITION, UTILITY and AUXILIARY). PACIFIC RESEARCH & ENGINEERING REVISION C...

  • Page 75: Microphone Input Modules

    With Sends PRE/post fader Send switch S5 gets its pre-fader input from balanced differential amplifier U2, and its post-fader input from dual amplifier U4. The outputs of the Send PRE/post switch are controlled by dual PACIFIC RESEARCH & ENGINEERING REVISION C...
  • Page 76 The CONSOLE COUGH ENABLE switch is intended for use with a microphone located at the console. This switch connects the ON button directly to U215B to provide momentary channel muting whenever the ON button is held depressed. PACIFIC RESEARCH & ENGINEERING REVISION C...
  • Page 77 3, giving a low at the output of U215A, which is routed to U215B. The “on” tally circuit will be de-energized. The low at U203 pin 7, via inverter U213F, saturates Q221, pulling down the Talk to PACIFIC RESEARCH & ENGINEERING REVISION C...

  • Page 78: Stereo Line Input Modules

    The voltage gain range from module input to the output of the amplifier is -18 dB to +2 dB. The gain trim control is adjusted to provide a level of -10 dB to the Patch Output line. PACIFIC RESEARCH & ENGINEERING REVISION C...
  • Page 79 Output driver short-circuit protection is provided to prevent damage caused by shorts in the output lines. As an example of this protection, consider the case when the A INPUT ON TALLY lamp is powered; PACIFIC RESEARCH & ENGINEERING REVISION C...

  • Page 80: Stereo Line Output Amplifier

    4.4.2 Circuitry NOTE: The stereo audio path consists of two identical sets of circuitry. For clarity and simplicity, only the left channel is described below. PACIFIC RESEARCH & ENGINEERING REVISION C...

  • Page 81: Control Room Monitor Module

    The output of the monitor input stage is also routed through Talk to selector output relay K1 to select buffer amplifier U1A. The 6 dB loss of the Talk to direct relay circuit is made up by the 6 dB gain of PACIFIC RESEARCH & ENGINEERING REVISION C...
  • Page 82 S200-2, which directs the high output of U201B to monitor dim relay K3. The Control Room monitors are automatically dimmed whenever the console initiates Talkback to another location. This low dim command comes into the monitor module on the DIM CR bus. This PACIFIC RESEARCH & ENGINEERING REVISION C...

  • Page 83: Two-Studio Monitor Module

    The output of the mute Studio relay is routed through dim relay K2 and feeds both the fixed and variable level monitor circuits. The “fixed level” signal is routed through Talk to Studio relay K4 and buffer PACIFIC RESEARCH & ENGINEERING REVISION C...

  • Page 84: Monaural Line Output Amplifier

    4.7 MONAURAL LINE OUTPUT AMPLIFIER 4.7.1 Function The Monaural Line Output Amplifier may select or mix any combination of the PROGRAM, AUDITION and UTILITY stereo signals to produce balanced MAIN and AUXILIARY monaural outputs. PACIFIC RESEARCH & ENGINEERING REVISION C...

  • Page 85: Circuitry

    NOTE: The two Telco mix-minus circuits are identical, thus only the Telco 1 path is described. The Telco 1 mix matrix consists of resistors R614 and R615 and summing amplifier U602B operating at unity gain. PACIFIC RESEARCH & ENGINEERING REVISION C...

  • Page 86: Send And Return Module

    U5A is connected to one input of gate U4A. A high at any input to this device will cause a high at its output. This high is applied through inverter U7B to ON lamp drive transistor Q3, and to transistor Q2 PACIFIC RESEARCH & ENGINEERING REVISION C...
  • Page 87 If U12A is in the off state (pin 2 high), then U11C will deliver a high at its output. This will toggle U12A via U6A. Pressing the remote ON button again causes no further action because U11C pin 10 PACIFIC RESEARCH & ENGINEERING REVISION C...

  • Page 88: Monaural Output/Telco Mix/Send And Return Module

    15 frequencies. The tones may be assigned to any combination of the PROGRAM, AUDITION and UTILITY mix buses. 4.11.2 Circuitry The Slate/Talkback/Test Oscillator module contains these five major circuit sections: • Slate Tone Oscillator • Console Talkback Microphone/Amplifier • Producer Microphone Input • Test Oscillator • Talkback PACIFIC RESEARCH & ENGINEERING REVISION C...
  • Page 89 C107 to U18B. As with the console slate system, about 40 milliseconds after the Producer’s SLATE button is pressed, the output of U18B goes high. This operates the Producer microphone, keying relay K1B, and the signal is routed to the “out” position of the OSC switch. PACIFIC RESEARCH & ENGINEERING REVISION C...
  • Page 90 U9 harder. This lowers the resistance of the output side of the coupler to increase the negative feedback around U10, and thus reduces the output amplitude of the oscillator to its design value. PACIFIC RESEARCH & ENGINEERING REVISION C...
  • Page 91 When the console operator presses the Talk to STUDIO-1 button, the output of U15C goes high, which is routed through U21A which then goes high, driving Q3 to pull down the Talk to STUDIO-1 logic PACIFIC RESEARCH & ENGINEERING REVISION C...
  • Page 92 The External preamplifier has a switchable pad, located before the input transformer in order that line-level input signals can be accommodated. The EXTERNAL remote controls operate similarly to the Producer controls, with the addition of the ability to Talk to the Control Room. PACIFIC RESEARCH & ENGINEERING REVISION C...

  • Page 93: Meter Switcher Module

    When a console module is placed in the CUE or SOLO mode, the Control Room Monitor Module routes the appropriate CUE or SOLO stereo signal and logic command to the Meter Switcher Module. The PACIFIC RESEARCH & ENGINEERING REVISION C...

  • Page 94: Remote Line Selector Module

    The +22 volt console power is regulated down to +16 volts by series regulator U1. The -22 volt console power is regulated down to -16 volts by series regulator U2. The various small components around the PACIFIC RESEARCH & ENGINEERING REVISION C...

  • Page 95: Vu Meter Buffer Amplifier

    (as viewed from the front). The outputs of these two supplies are coupled in series for the required bipolar PACIFIC RESEARCH & ENGINEERING REVISION C...
  • Page 96 CR1 and CR2, and filtered by capacitor C1. The regulator is a discrete design, using a highly filtered zener diode reference and a series-pass Darlington transistor. The output noise is extremely low, in keeping with the requirements for the phantom powering of microphones. PACIFIC RESEARCH & ENGINEERING REVISION C...

  • Page 97: Options And Modifications

    Apply a 1 kHz test signal at -10 dBu (600 ohm source) to both the left and right Patch Returns. Adjust the module GAIN TRIM controls for a +8 dBu output into a balanced bridging load. PACIFIC RESEARCH & ENGINEERING REVISION C...

  • Page 98: Stereo Send Operation

    E5 and E6 and points E7 and E8 on the module PC assembly. This modification allows the post-fader microphone signal to be manipulated in the stereo image by means of the module PAN control. NOTE: PRE-fader Microphone Input Module operation will be the same as before this modification. PACIFIC RESEARCH & ENGINEERING REVISION C...

  • Page 99: Input Module Steady Cue Indication

    SINGLE SEND OPERATION (Using One Hybrid) In systems where a single Send output is being used, connect Telco Output 1 and the Send-1 Output to the telephone hybrid as shown in Figure 5.1 (on the following page). PACIFIC RESEARCH & ENGINEERING REVISION C...
  • Page 100 Caller-1, as shown in Figure 5.2. Depress the PRE-fader and SEND-2 buttons on all input modules to be added to the Send– 2 output, including Caller-2 audio. Turn Send-1 and Send-2 ON via the Send And Return Module. PACIFIC RESEARCH & ENGINEERING REVISION C...
  • Page 101 Tally, so that the speaker will mute whenever the Control Room is muted, as shown in Figure 5.3. "OFF-AIR" Variable Telco AMPLIFIER TELCO SPEAKER Monitor Output To C/R Monitor Module C/R WARNING TALLY To C/R Monitor Module Logic Common FIGURE 5.3 "OFF-AIR" TELCO SPEAKER CONNECTION PACIFIC RESEARCH & ENGINEERING REVISION C...

  • Page 102: Talkback/Intercom Module

    " 10 11 12 - No Connection - " Talk From Studio-1 Output LOGIC " NOTE: The Talk From Studio Input and Talk To Studio Output are calibrated for a 0 dBu operating level. PACIFIC RESEARCH & ENGINEERING REVISION C...
  • Page 103 When the TALK TO CONTROL ROOM tally is connected as shown above, the switch lamp will be illuminated at all times. The MUTE and DIM outputs are only active when Talkback is taking place via a console Microphone Input Module. PACIFIC RESEARCH & ENGINEERING REVISION C...
  • Page 104 NOTE: Since the Studio only dims when Talkback is occurring via a console Microphone Input module, this switch will have no effect when the Talk From Studio Input is being used. Closing S3-1 causes the Studio-1 dim function to block incoming Talkback signals to Studio-1. Closing PACIFIC RESEARCH & ENGINEERING REVISION C...
  • Page 105 U7D to drive TALKBACK OUTPUT switch Q6 low. The output of U8C connects to U8B, which will allow the TALKBACK WITH MUTE switch to go low if the E1 to E2 is installed or the TALK OVER MUTE switch is disengaged. PACIFIC RESEARCH & ENGINEERING REVISION C...

  • Page 106: Maintenance And Alignment

    NOTE: Failure to use this tool will probably result in damage to the lens’ molded retaining notches. PACIFIC RESEARCH & ENGINEERING REVISION C...

  • Page 107: Button Replacement

    Once the nut is loosened, the collet should release from the shaft. This nut should not need to be removed unless the collet refuses to release. 6.2 TROUBLESHOOTING (MODULE REMOVAL) The modular construction of the console greatly enhances troubleshooting, since module substitution will usually isolate any problem. PACIFIC RESEARCH & ENGINEERING REVISION C...

  • Page 108: Level Alignment

    Apply a 1 kHz test signal at +4 dBu (600 ohm source) to both the left and right module inputs. Adjust the module GAIN TRIM controls for a -10 dBu output at the module Patch Sends. PACIFIC RESEARCH & ENGINEERING REVISION C...
  • Page 109 Apply a 1 kHz test signal at -10 dBu to the left and right Patch Returns of a Stereo Line Input Module. Place the module in CUE and adjust the Meter Switcher Module gain trim controls for a 0 VU level on the AUXILIARY meters. PACIFIC RESEARCH & ENGINEERING REVISION C...

  • Page 110: Tool Kit

    Op Amp, Dual, 8-Pin, DIP, 5532 20-53 Quad 2-input AND, 4081 21-68 Quad 2-input NAND, 4093 21-4 Quad 2-input OR, 4071 21-57 Quad 2-input NOR, 4001 21-61 Quad 2-input Multiplexer, 4551 21-90 Triple 3-input OR 21-67 PACIFIC RESEARCH & ENGINEERING REVISION C...
  • Page 111 In applications where any system “downtime” is unacceptable, it is recommended that the following modules be kept on hand as spares: DESCRIPTION PR&E# Power Supply Assembly 99-238A Microphone Input Module 99-252 Stereo Line Input Module 99-253 Stereo Line Output Amplifier 99-258-1 Control Room Monitor Module 99-257 PACIFIC RESEARCH & ENGINEERING REVISION C...

  • Page 112: Replacement Parts

    Square, Red, “ON” (Sends) 25-115-1 Square, White (Solo) 25-118 Square, White, “S” 25-118-1 Square, Yellow (Cue) 25-116 Buttons, Self-Indicating (“Winkeye”) Rectangular, Blk/Org, “PGM” 25-768-1 Rectangular, Blk/Org, “AUD” 25-768-2 Rectangular, Blk/Org, “UTL” 25-768-3 Square, Blk/Org 25-769 PACIFIC RESEARCH & ENGINEERING REVISION C...
  • Page 113 65-14 Tantalum, 10µF, 20V 65-6 Tantalum, 10µF, 35V 65-5 Tantalum, 10µF, 50V 65-8 Circuit Breakers For Audio Power Supply 30-32 For Logic Power Supply 30-28 For Phantom Power Supply 30-9 Cue Header Assembly 90-326 PACIFIC RESEARCH & ENGINEERING REVISION C...
  • Page 114 Hex Inverter, 4584 21-46 Hex Buffer, Non-Inverting, 4050 21-47 Op Amp, DIP, NE5534N 20-28 Op Amp, Dual, LF353N 20-32 Op Amp, Dual, 8-pin DIP, NE5532N 20-53 Op Amp, Dual, 8-pin DIP, NE5532, Ceramic 20-61 PACIFIC RESEARCH & ENGINEERING REVISION C...
  • Page 115 Output Assignment Switcher Assembly 95-143-1 Microphone Input Without Sends 99-262 Monaural Output Amplifier 99-264 Monaural Output/Telco Mix 99-265 Remote Line Selector 99-267 Send and Return 99-255 Output Assignment Switcher Assembly 95-143-2 Send and Return/Mono Output/Telco Mix 99-266 PACIFIC RESEARCH & ENGINEERING REVISION C...
  • Page 116 25-775 2-Station, 6PDT, Interlock/Lockout 25-755 3-Station, 2PDT, Push-Push 25-764 3-Station, 2PDT, Interlock (Telco Mix, Mono Output) 25-765 3-Station, 2PDT, Interlock/Lockout (Slate/Talkback/Test) 25-774 5-Station, 4PDT, Interlock/Lockout 25-763 10-Station, 4PDT, Interlock 25-793 12-Station, 4PDT, Interlock/Lockout 25-761 PACIFIC RESEARCH & ENGINEERING REVISION C...
  • Page 117 Voltage Regulators Variable, 1.5A, Pos., LM317T 20-49 Variable, 1.5A, Neg., LM337T 20-59 Variable, 5A, LM338K 20-57 Variable, 10A, LM396 20-58 VU Meters 3.5" 46-12 3.5", with Buffer Amplifier 99-222-1 VU Meter Buffer Amplifier 95-72 PACIFIC RESEARCH & ENGINEERING REVISION C...
  • Page 118 7.21 Output Amplifier Function Module Schematic 7.22 Instrumentation Amplifier Function Module Schematic 7.23 990 Function Module Schematic 7.24 Console Main Mother Board Schematic 7.25 Monitor Selector Mother Board Schematic 7.26 Remote Line Selector Mother Board Schematic PACIFIC RESEARCH & ENGINEERING REVISION C...

  • Page 119: Monitor Module Input

    7.27.18 Meter Power 7.27.19 Timer Control 7.27.20 Remote Control Panel Cable Assembly NOTE: On PR&E schematics, capacitor values are in microfarads (µF), unless otherwise specified, and resistors are 1/4 watt, 5%, unless otherwise specified. PACIFIC RESEARCH & ENGINEERING REVISION C...

  • Page 120: Accessories

    2, for use with tape machines with 14 volt lamp tallies; #99-221-3, for use with tape machines with 28 volt lamp tallies; and 99-221-4, for use with tape machines with a 5 volt record tally only. REVISION B PACIFIC RESEARCH & ENGINEERING...

  • Page 121: Clocks And Timers

    These switches are centered beneath the three pairs of digits about 1/4 inch above the bottom of the bezel, as shown in Figure 8.1. DIGICLOCK TD-2 PACIFIC RESEARCH & ENGINEERING CORP. PR&E #90-151 FAST SLOW HOLD FIGURE 8.1 TD-2 DIGITAL CLOCK...

  • Page 122: Digital Slave Clock

    PR&E consoles. Power and master clock connection are made to the rear of the unit. TD-171 PACIFIC RESEARCH & ENGINEERING CORP. FIGURE 8.2 TD-171 DIGITAL SLAVE CLOCK CIRCUITRY The TD-171 circuit is virtually the same as the ESE model ES-171 unit (the TD-171 is manufactured with the express consent of ESE).

  • Page 123: Digital Timer

    See Section 3.15 for instruction in operating the timer. DIGITIMER DT-4 PACIFIC RESEARCH & ENGINEERING CORP. FIGURE 8.3 DT-4 DIGITAL TIMER NOTE: Three five-pin timer reset Molex connectors are provided at the rear of the mainframe for connection to external timers, if desired.

  • Page 124: Ppm Meter

    However, the second power supply in a redundant system does add approximately 50 watts of heat, due to the excitation current consumed by the power transformers. REVISION B PACIFIC RESEARCH & ENGINEERING...

  • Page 125: Logic Interfaces

    When a machine "Y" cable is used in an installation, only the "Y" cable (not the control cables) is machine dependent. Figure 8.5 (on the following page) provides an overview of the logic interface and cable system. REVISION B PACIFIC RESEARCH & ENGINEERING...
  • Page 126 B) Pin assignment for the PR&E #99-38, #99-464 and #99-465 console to interface cables, and the #99-453, #99-454 and #99-455 control cables, is defined in Section 8.6. FIGURE 8.5 LOGIC INTERFACE AND CABLE SYSTEM OVERVIEW REVISION B PACIFIC RESEARCH & ENGINEERING...

  • Page 127: Tci-2A Cartridge Interface

    Opto-isolators U6 and U7 are connected through current limiting resistors R11 and R13 to the console START and STOP pulses on J1, respectively. The open collector outputs of U6 and U7 are connected to REVISION B PACIFIC RESEARCH & ENGINEERING...

  • Page 128: Cartridge Interface (+12 To +28 Volt Logic)

    TI-2 interface cable (PR&E #99-464), see Section 8.6. NOTE: This interface may also be used with cartridge machines. In this event, use console to interface cable #99-38 if the replay lockout function is desired. REVISION B PACIFIC RESEARCH & ENGINEERING...

  • Page 129: Turntable Interface

    With the NOT RUN line’s high state fed to U2D, a START pulse, via R4, R5, C3, U2D and U2B, will cause a CONTROL pulse output via isolator circuit R8, R9, Q2, U3, R10, R11 and C5, REVISION B PACIFIC RESEARCH & ENGINEERING...

  • Page 130: Warning Light Interface

    ON. When the mic module is turned OFF, the cassette tape machines toggle from the record mode into the pause mode. In this way, a recording of a personality or personalities may be created for later review. REVISION B PACIFIC RESEARCH & ENGINEERING...
  • Page 131 R9, C10/R14 and C11/R17. Each monostable is connected to an opto-isolator to eliminate any audio or logic ground loops. Opto-isolators U3, U4, U6 and U7 are driven by transistors Q1, Q2, Q3 and Q4. REVISION B PACIFIC RESEARCH & ENGINEERING...

  • Page 132: Accessory Schematics

    #99-454 Control Cable, 12-pin Male To Male 8.6.21 #99-455 Control Cable, 24-pin Male To Male NOTE: On PR&E schematics, capacitor values are in microfarads (µF), unless otherwise specified, and resistors are 1/4 watt, 5%, unless otherwise specified. REVISION B PACIFIC RESEARCH & ENGINEERING...

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