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Model 742
Model 742 Audio Mixer
User Guide
Issue 2, May 2005
This User Guide is applicable for serial numbers:
M742-00160 and later*
* For units with serial numbers 00160-00169 refer to the
Technical Notes section of this user guide
© 2005 by Studio Technologies, Inc., all rights reserved
www.studio-tech.com
50265-0505, Issue 2
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Summary of Contents for Studio Technologies 742
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Page 1: User Guide
This User Guide is applicable for serial numbers: M742-00160 and later* * For units with serial numbers 00160-00169 refer to the Technical Notes section of this user guide © 2005 by Studio Technologies, Inc., all rights reserved www.studio-tech.com 50265-0505, Issue 2... - Page 2 This page intentionally left blank.
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Page 3: Table Of Contents
System Features ............6 Configuration Review ............ 8 Installation ..............10 Post-Installation Calibration .......... 15 Operation ..............17 Technical Notes ............. 23 Specifications ..............27 Block Diagrams Model 742 User Guide Issue 2, May 2005 Studio Technologies, Inc. Page 3... - Page 4 Model 742 This page intentionally left blank. Issue 2, May 2005 Model 742 User Guide Page 4 Studio Technologies, Inc.
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Page 5: Introduction
Model 742 Audio Mixer. Additional too little time to do them, the Model 742 is background and technical information is a refreshing combination of performance also provided, as well as a product block and simplicity. -
Page 6: System Features
Model 742’s operator controls, is located on front-panel controls and indicators—the the front panel. For operator assistance, a... -
Page 7: Monitor Section
Model 742’s front panel. Internal even serve as an additional set of main configuration jumpers determine the com- bus line-level outputs. -
Page 8: Configuration Review
“pre” the Mains Power level controls, but this time with a nomi- The Model 742 requires one space in a nal level of +4 dBu. This can be used for standard 19-inch rack. Industry-standard various applications, including providing XLR-type and ¼-inch 3-conductor connec-... -
Page 9: Phantom Power
However, excep- to assist in providing clear, intelligible tions do arise and the Model 742 does audio! allow 12-volt phantom power to be supplied to the four mic/line input chan- Monitor Output Modes nels. -
Page 10: Installation
Installation Model 742’s back panel is not required. However, there is one trim potentiometer In this section, the Model 742 will be that may need to be adjusted prior to the installed in an equipment rack. Audio Model 742 going into service. This trim pot... -
Page 11: Line Inputs
Mounting It’s possible that some of the mic/line inputs will be wired to an input/output The Model 742 is intended for mounting in (I/O) panel located on the side or rear of a standard 19-inch equipment rack, requir- a broadcast vehicle. If this is the case, it’s ing 1.75 vertical inches (one standard rack... -
Page 12: Main Outputs
Main Outputs a vehicle’s I/O panel, it’s recommended that one-to-one isolation transformers be The Model 742 contains two main outputs placed in their signal paths. Ensure that which are directly associated with output any transformer selected is specified for buses 1 and 2. -
Page 13: Monitor Outputs
In the “pre +4” mode the directly on the connector that mates with monitor outputs have a fixed nominal the Model 742, not at the other end of the output level of +4 dBu. cable. The monitor outputs utilize ¼-inch 3-conductor jacks for interconnection. -
Page 14: Headphone Output
1, or the ring and sleeve terminals for main output bus 2, on the 3-conductor plug used to mate with the Model 742’s back-panel jack. Don’t use a 2-conductor (mono) plug as the headphone output for Detail of back panel showing reference tone main output bus 2 will be shorted. -
Page 15: Post-Installation Calibration
0.1 A, 5 x 20 mm time-lag as soon as AC mains power is connected. fuse. To confirm that the Model 742 is operating the LED indicator labeled PWR/TONE will Before connecting the Model 742 to AC light. - Page 16 1. Confirm that the reference tone direct output is terminated with its installa- tion-specific load impedance. 2. Ensure that the Model 742 is connect- ed to AC mains power. 3. Using an appropriate adapter cable, connect a high-input-impedance audio...
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Page 17: Operation
Brother® P-Touch ¼-inch (6 mm) labels be created. Selecting tape material that prints white text on a black background works out perfectly for the Model 742. The Brother label cassette number TX-3151, white on black, is appropriate for use with some of their printers. - Page 18 2. In the “center” posi- input signal, along with the gain or loss of tion the signal is sent to both output buses 1 and 2. Issue 2, May 2005 Model 742 User Guide Page 18 Studio Technologies, Inc.
- Page 19 Model 742 Master Section/Main Output threshold of the compressors and associ- ated LEDs depends on how the Model 742 Buses has been configured: The Model 742’s master section supports • From the factory the compressor output buses 1 and 2 with several controls...
- Page 20 Two yellow LEDs Model 742 use. To a great degree meter light with signals slightly higher in level activity will depend on how the compres- than normal.
- Page 21 Monitor output 2, (The LED lights green when the Model and the right channel of the headphone 742 is operating and the tone is not as- output, use output bus 2 as their audio signed to the output buses.) The level of source.
- Page 22 742.) Using the headphone output to configured: monitor the Model 742 is a bit different than monitoring a typical “stereo” audio source. • From the factory the monitor output is This is because the audio source for the left...
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Page 23: Technical Notes
But the LEDs takes a “keen eye.” When viewed with the should never light continuously. If this is Model 742’s cover off, it is located near the case the input level controls should be the front of the printed circuit board, near... - Page 24 Moving the mains power transformer. It is labeled the jumpers to the PRE +4 locations sets TONE FREQ. the monitor outputs to be “pre” the level Issue 2, May 2005 Model 742 User Guide Page 24 Studio Technologies, Inc.
- Page 25 Model 742 Feature Set unit. The attack and release times were The Model 742 was carefully designed also carefully selected for overall excel- with simplicity of operation in mind. Only lent performance. A typical user is not the required features and functions were in a position to, “on the fly,”...
- Page 26 Mic/Line Switching Serial Numbers 00160-00169 As previously discussed, the four mic/line Model 742 units with serial numbers in the input circuits can be selected for compat- range of 00160 to 00169 have one feature ibility with microphone or line-level signals.
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Page 27: Specifications
100 ohm series resistors and peak Compatibility: intended for connection to head- phones with impedance of 100 ohms or greater Maximum Voltage: 8 Vpp, 100 ohm load Model 742 User Guide Issue 2, May 2005 Studio Technologies, Inc. Page 27... - Page 28 9.5 inches deep (24.1 cm) Mounting: One standard rack space Weight: 8.5 pounds (3.9 kg) Specifications and information contained in this User Guide subject to change without notice. Issue 2, May 2005 Model 742 User Guide Page 28 Studio Technologies, Inc.
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