Pacific Research BMX-III-18 User manual

BMX-III
Operations
&
Technical
Manual
PR&E Document #75-10
Broadcast Console
2070 Las Palmas Drive • Carlsbad, CA 92009 USA • Tel: [phone] FAX: [phone] • E-Mail: [email protected] • Internet: http://www.pre.com
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
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

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BMX SERIES III CONSOLE
PACIFIC RESEARCH & ENGINEERING
PR&E DOCUMENT #75-10
STATUS PAGE
(Revision C - June 1999)
Thislistingprovidesareferenceofcurrentpagesofthisdocument,andtheirrevisionnumbers(i.e.,A.1,A.2,etc.).
WhenarevisiontothisdocumentisreceivedfromPR&E,simplyreplacetheoldpageswiththenewones,discard
the old pages, and post the new status page in the front of this manual (NOTE: It may be desirable to retain
replaced status pages in order to have a record of document changes). If deemed necessary by PR&E’s
Engineering Department, comment information relating to any change may also be included on this page.
Page No. Revision Comments
ALL B Corporate Name Change
4,5,78,89 C Standard output level is now
90,100,101 +4 dBu instead of +8 dBu.
References in text updated.
ALL C Files changed to PC format.
Text & graphics updated.
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TABLE OF CONTENTS
1.0 GENERAL INFORMATION 1
1.1 Introduction 1
1.2 Description 1
1.3 Specifications 3
1.4 Warranty Information 6
2.0 INSTALLATION 7
2.1 General Guidelines 7
2.2 Cable Preparation 8
2.3 Mainframe Configuration 10
2.3.1 Control Panel 10
2.3.2 Meter Panel 11
2.3.3 Connector Panel 12
2.4 Grounding And Shielding 14
2.5 Power Connection 14
2.6 Patch Point Connection 15
2.7 Audio And Logic Connection 16
2.7.1 Microphone Input Module Connection 18
2.7.2 Stereo Line Input Module Connection 19
2.7.3 Stereo Line Output Amplifier Connection 20
2.7.4 Monitor Module Input Connection 21
2.7.5 Control Room Monitor Module Connection 22
2.7.6 Two-Studio Monitor Module Connection 23
2.7.7 Monaural Line Output Amplifier Connection 24
2.7.8 Telco Mix Module Connection 25
2.7.9 Send And Return Module Connection 26
2.7.10 Slate/Talkback/Test Osc. Module Connection 27
2.7.11 Meter Switcher Module Connection 28
2.7.12 Remote Line Selector Module Connection 29
2.7.13 Timer Control Connection 30
2.8 Module Remote Control Capabilities 31
2.8.1 Microphone Input Module Remote Control 31
2.8.2 Stereo Line Input Module Remote Control 32
2.8.3 Control Room Monitor Module Remote Control 33
2.8.4 Two-Studio Monitor Module Remote Control 35
2.8.5 Send And Return Module Remote Control 37
2.8.6 Slate/Talkback/Test Oscillator Remote Control 38
2.9 Module Internal Option Switches 40
2.9.1 Microphone Input Module Option Switches 40
2.9.2 Stereo Line Input Module Option Switches 42
2.9.3 Control Room Monitor Module Option Switch 44
2.9.4 Two-Studio Monitor Module Option Switch 46
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2.9.5 Telco Mix Option Switch 47
2.9.6 Send And Return Module Option Switches 48
2.9.7 Slate/Talkback/Test Osc. Module Option Switch 49
2.9.8 Meter Switcher Module Option Switch 50
3.0 OPERATION 51
3.1 Microphone Input Module 51
3.2 Microphone Input Module With Sends 52
3.3 Stereo Line Input Module 53
3.4 Stereo Line Input Module With Sends 54
3.5 Stereo Line Output Amplifier 55
3.6 Control Room Monitor Module 56
3.7 Two-Studio Monitor Module 57
3.8 Monaural Line Output Amplifier 58
3.9 Monaural Output/Telco Mix Module 59
3.10 Send And Return Module 60
3.11 Monaural Output/Telco Mix/Send And Return Module 61
3.12 Slate/Talkback/Test Oscillator Module 62
3.13 Meter Switcher Module 63
3.14 Remote Line Selector Module 64
3.15 Timer Control Panel 65
4.0 EQUIPMENT DESCRIPTION 66
4.1 Mainframe 66
4.1.1 Function 66
4.1.2 Circuitry 66
4.2 Microphone Input Modules 67
4.2.1 Function 67
4.2.2 Circuitry 67
4.3 Stereo Line Input Modules 70
4.3.1 Function 70
4.3.2 Circuitry 70
4.4 Stereo Line Output Amplifier 72
4.4.1 Function 72
4.4.2 Circuitry 72
4.5 Control Room Monitor Module 73
4.5.1 Function 73
4.5.2 Circuitry 73
4.6 Two-Studio Monitor Module 75
4.6.1 Function 75
4.6.2 Circuitry 75
4.7 Monaural Line Output Amplifier 76
4.7.1 Function 76
4.7.2 Circuitry 77
4.8 Monaural Output/Telco Mix Module 77
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4.8.1 Function 77
4.8.2 Circuitry 77
4.9Send And Return Module 78
4.9.1 Function 78
4.9.2 Circuitry 78
4.10Monaural Output/Telco Mix/Send And Return Module 80
4.11Slate/Talkback/Test Oscillator Module 80
4.11.1Function 80
4.11.2Circuitry 80
4.12Meter Switcher Module 85
4.12.1Function 85
4.12.2Circuitry 85
4.13Remote Line Selector Module 86
4.13.1Function 86
4.13.2Circuitry 86
4.14VU Meter Power Regulator 86
4.14.1Function 86
4.14.2Circuitry 87
4.15VU Meter Buffer Amplifier 87
4.15.1Function 87
4.15.2Circuitry 87
4.16Power Supply Assembly 87
4.16.1Function 87
4.16.2Circuitry 87
5.0 OPTIONS AND MODIFICATIONS 89
5.1Phantom Microphone Powering 89
5.2Output Level Conversion (+4 dBu to +8 dBu) 89
5.3Stereo Send Operation 90
5.4Input Module Steady Cue Indication 91
5.5Using Send Circuits For Telco Operations 91
5.6Talkback/Intercom Module 94
6.0MAINTENANCE AND ALIGNMENT 98
6.1Routine Maintenance 98
6.1.1 Checking Power Supply Voltages 98
6.1.2 Lamp Replacement 98
6.1.3 Button Replacement 99
6.1.4 ColletKnob Removal 99
6.2Troubleshooting (Module Removal) 99
6.3Level Alignment 100
6.4 Tool Kit 102
6.5Spare Parts Kit 102
6.6Replacement Parts 104
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7.0 DRAWINGS AND SCHEMATICS 110
7.1 Functional Block Diagrams (Console Block Diagram) 112
7.1.1 Microphone Input Module Block Diagram 113
7.1.2 Stereo Line Input Module Block Diagram 114
7.1.3 Stereo Line Output Amplifier Block Diagram 115
7.1.4 Control Room Monitor Module Block Diagram 116
7.1.5 Two-Studio Monitor Module Block Diagram 117
7.1.6 Monaural Line Output Amplifier Block Diagram 118
7.1.7 Telco Mix Module Block Diagram 119
7.1.8 Send And Return Module Block Diagram 120
7.1.9 Slate/Talkback/Test Oscillator Block Diagram 121
7.1.10 Meter Switcher Module Block Diagram 122
7.1.11 Remote Line Selector Module Block Diagram 123
7.2 Microphone Input Module Schematic 124
7.3 Microphone Input Module With Sends Schematic 129
7.4 Stereo Line Input Module Schematic 134
7.5 Stereo Line Input Module With Sends Schematic 139
7.6 Stereo Line Output Amplifier Schematic 144
7.7 Control Room Monitor Module Schematic 146
7.8 Two-Studio Monitor Module Schematic 149
7.9 Monitor Module Switching Schematic 153
7.10 Monaural Line Output Amplifier Schematic 154
7.11 Monaural Output/Telco Mix Module Schematic 155
7.12 Send And Return Module Schematic 157
7.13 Mono/Telco/Send And Return Module Schematic 160
7.14 Slate/Talkback/Test Oscillator Module Schematic 165
7.15 Talkback/Intercom Module 168
7.16 Meter Switcher Module Schematic 170
7.17 Remote Line Selector Module Schematic 171
7.18 VU Meter Buffer Amplifier Schematic 172
7.19 Meter Power Regulator Schematic 173
7.20 Power Supply Assembly Schematic 174
7.21 Output Amplifier Function Module Schematic 175
7.22 Instrumentation Amplifier Function Module Schematic 176
7.23 990 Function Module Schematic 177
7.24 Console Main Mother Board Schematic 178
7.25 Monitor Selector Mother Board Schematic 179
7.26 Remote Line Selector Mother Board Schematic 180
7.27 Console Wiring (Edge Connector Layout) 181
7.27.1 Microphone Input Module Audio 182
7.27.2 Stereo Line Input Module Audio 183
7.27.3 Input Module Logic 184
7.27.4 Program Amplifier Output 185
7.27.5 Audition Amplifier Output 186
7.27.6 Utility Amplifier Output 187
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7.27.7 Monitor Module Input 188
7.27.8 Control Room Monitor Module 189
7.27.9 Two-Studio Monitor Module 190
7.27.10 Monaural Amplifier Output 191
7.27.11 Telco Mix 192
7.27.12 Send And Return 193
7.27.13 Slate/Talkback/Test Oscillator Audio 194
7.27.14 Slate/Talkback/Test Oscillator Logic 195
7.27.15 Meter Switcher Module 196
7.27.16 Remote Line Selector Inputs 197
7.27.17 Remote Line Selector Outputs 198
7.27.18 Meter Power 199
7.27.19 Timer Control 200
7.27.20 Remote Control Panel Cable Assembly 201
8.0 ACCESSORIES 202
8.1 Tape Machine Remote Control Panels 202
8.1.1 Cart Recorder Remote Control Panel 202
8.1.2 Tape Recorder Remote Control Panel 202
8.2 Clocks And Timers 203
8.2.1 TD-2 Digital Clock 203
8.2.2 TD-171 Digital Slave Clock 204
8.2.3 DT-4 Digital Timer 205
8.3 PPM Meter 206
8.4 Redundant Power Supply Coupler Unit 206
8.5 Logic Interfaces 207
8.5.1 TCI-2A Cartridge Interface 209
8.5.2 CI-2 Cartridge Interface (+12 to +28 Volt Logic) 210
8.5.3 CI-2 Cartridge Interface (+5 Volt Logic) 210
8.5.4 TI-2 Tape Interface 210
8.5.5 TT-3 Turntable Interface 211
8.5.6 WL-2 Warning Light Interface 212
8.5.7 Dual Relay Interface 212
8.5.8 Cassette Skimmer Interface 212
8.6 Accessory Schematics 214
8.6.1 Cart Recorder Remote Control Panel 215
8.6.2 Tape Recorder Remote Control Panel 216
8.6.3 TD-2 Digital Clock 217
8.6.4 TD-171 Digital Slave Clock 218
8.6.5 DT-4 Digital Timer 219
8.6.6 Timer Control Panel 220
8.6.7 PPM Buffer Amplifier 221
8.6.8 Power Supply Coupler Unit 222
8.6.9 TCI-2A Cartridge Interface 223
8.6.10 CI-2 Cartridge Interface 224
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8.6.11 TI-2 Tape Interface 225
8.6.12 TT-3 Turntable Interface 226
8.6.13 WL-2 Warning Light Interface 227
8.6.14 Dual Relay Interface 228
8.6.15 Cassette Skimmer Interface 229
8.6.16 #99-38 Console To Interface Cable 230
8.6.17 #99-464 Console To TI-2 Interface Cable 231
8.6.18 #99-465 Console To CI-2 Interface Cable 232
8.6.19 #99-453 Control Cable, 9-Pin Male To Male 233
8.6.20 #99-454 Control Cable, 12-Pin Male To Male 234
8.6.21 #99-455 Control Cable, 24-Pin Male To Male 235
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1.0 GENERAL INFORMATION
This chapter contains an introduction to the BMX Series III Broadcast Console Technical Manual, an
overview of the 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. Your decision to go with PR&E means that you expect more
than simple working hardware. Please be assured that it is our strong desire to provide each of our
customers with the kind of products, systems, documentation and support that we would specify if we
were in your position.
We invite your comments and suggestions for improvement of this document, and of all our services.
By constant attention to our customer’s needs, we will continue to earn our reputation for excellence,
and to refine our understanding of the requirements of the marketplace.
Thismanualisdesigned to provide the information required tounderstand,install,operateandmaintain
theBMXIIIBroadcastConsole. Itisassumedthatthereaderhasaworkingknowledgeofaudiocontrol
consoles, systems and installation practices. The BMX III is a very sophisticated device with an
extensive range of features and capabilities. To obtain the maximum benefit of the console’s
capabilities, it is strongly recommended that the Installation, Operation, and Equipment Description
chapters of this manual be read thoroughly prior to installing the console.
Each BMX III is specifically configured to the customer’s requirements, thoroughly tested, and
“burned-in” prior to packing for shipment. Should you encounter any difficulty during installation or
initial operation, we recommend that you contact PR&E for assistance.
1.2 DESCRIPTION
The BMX III is designed with the capacity to accomplish almost any type of stereo on-air audio control
taskinaradiobroadcastfacility.Inaddition,patchpointsaresuppliedforalltheinputandthelineoutput
amplifiers for the insertion of processing equipment. This gives the BMX III the capability for creative
production as well as on-air applications.
The BMX III was developed in parallel with our AMX Broadcast Operations Console, and many of the
function modules were derived from the AMX concepts. For example, the BMX III Microphone and
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StereoLineInputModulesarealmostidenticaltotheAMXmodules,withtheexceptionofthetwoSend
circuits, while the Control Room Monitor, Two-Studio Monitor, Stereo Line Output, and Slate/
Talkback/Test Oscillator Modules are identical. The BMX III will also accommodate the AMX input
modules with Sends, along with the optional Send And Return Module. The Monaural Output, Telco
MixandSendAndReturnModulesfortheAMX havebeencombinedintoa singlemodulefortheBMX
III, but all are still available as individual modules, depending upon customer requirements.
NOTE: The BMX III was not derived from the BMX Series II, but was designed to be part of the ABX
and AMX family of broadcast consoles. Therefore, the BMX Series II and Series III consoles do not
share any common modules or subassemblies.
The BMX III is currently being produced in seven mainframe sizes which will accommodate 10, 14,
18, 22, 26, 30 and 34 input modules. The term “input modules” refers to microphone and line input
modules. The seven mainframes are virtually identical with the only difference being the available
space for the meter panel.
In order to realize the full potential of the BMX III, it is important that the user become fully acquainted
withtheextensiveaudio and logic control functions available. Theconsoleandmoduleblockdiagrams,
located in Chapter 7 of this document, show the audio signal flow and the extensive logic control inputs
and outputs which are available to the user. These block diagrams present a concise picture of the
modules’ operating functions and features as well as the overall console system, and can be very useful
in determining how to best utilize your BMX III.
The BMX III has been designed functionally, mechanically and electronically to provide the maximum
value in performance and features of any currently available broadcast console. Highest quality
components and circuit designs are used throughout the console. The gain structure of the console has
been designed so that normal operation is easily achieved without danger of internal clipping (when
operating the amplifiers at optimum signal to noise conditions).
The input modules accommodate the range of input levels normally found in broadcast operations
without the use of external pads or amplifiers. A patch point is provided for each input position after
theinputamplifierandbefore the fader. This is the optimumpointatwhichto insert external processing
devicessuchaslimitersandequalizers.Patchpointsarealsoprovidedineachmainoutputchannel(after
the mixing amplifier and before the line output amplifiers).
All console inputs and program outputs are balanced, for best noise rejection and simplified system
grounding. When properly installed using the information in this manual, the BMX III console is free
of internal pops, clicks, and radio-frequency interference (RFI).
The separately packaged power supply is fully regulated, and is protected with magnetic circuit
breakers, as well as electronic safeguards against excessive current and line voltage fluctuations. The
powersupplyprovidesfourseparatevoltageoutputs.Twooftheseoutputs(±22volts)areusedtopower
the audio circuitry. The third output (+12 volts) is used to power the logic control circuitry, lamps and
relays.Thefourth output (+ 48 volts)is for the phantom poweringof condenser microphones connected
to the Microphone Input Modules.