MODELS SE30 & SE30-2E GATED COMPRESSOR/MIXER OPERATING AND SERVICE MANUAL Copyright 1981, Shure Brothers Inc. 27A8025 (AK) (90A8103) Printed in U.S.A.
Table of Contents List of Illustrations WARNING To reduce the risk of fire or electric shock, do not expose this appliance to rain or extreme moisture.
(Model SE30 shown) DESCRIPTION The Shure Model SE30* Gated Compressor/Mixer is a high-quality gated memory compressor combined with a self-contained, portable, three-input mixer and remote amplifier designed specifically for professional applications in AM, FM, and TV broadcasting, film, tape, and disc recording, CATV, and sound reinforcement.
SPECIFICATIONS (Cont’d) Input/Output: Distortion: Below compression threshold, under 0.5% THD at +15 dBm output, 30-20 kHz. At 10 dB compression, under 1% THD at +15 dBm output, Response Rate set to 7, 50-20 kHz. With Response Rate set to 0 (fast), under 2% THD at 50 Hz. At 1 kHz, under 0.8% THD at any level of compression from 0 to 40 dB. Compression Ratio: 8:1 minimum from 10 to 20 db compression. 5:1 minimum from 10 to 30 dB compression.
SPECIFICATIONS (Cont’d) Battery Operation: 27 volts nominal, 21.5 volts minimum. Current consumption at 27 volts, 10 ma. at no signal; 12 ma. at 20 dB compression and +8 dBm output. Battery Life: Estimated 80 hours at 4 hours use per day. Battery Complement: 9 volt, 6 Eveready type 222 or 216 or equivalent. One heavy-duty 1.5 volt “D” size cell, Eveready type D99 or equivalent to power Aux. Light approximately 8 hours continuously.
CONTROLS AND CONNECTORS FIGURE 2
(25) AC Power Receptacle: Special internationally accepted connector for detachable ac line cord, threewire with safety ground pin. (26) 30 Volts DC Jacks: May be used for powering the unit from an external 30 ± 20% dc source, or for powering external equipment (up to 5 ma) from the batteries or ac operated power supply of the SE30. Controlled by front-panel Power switch (11) except that an external load will discharge the batteries with the unit OFF.
GENERAL OPERATION (Cont’d) The “Tip” connection of the headphone plug will be in phase with Pin 3 of all Input (13) and Output (16) connectors, and with the tip of the Mix Bus jack (12). TYPICAL SET-UP AND OPERATION A typical set-up and operation procedure is described for remote amplifier applications, with a single input source (microphone). 1. Connect microphone to Input 1 connector (13a) and set Input switches (14) to MIC.
OPERATING CONSIDERATIONS (Cont’d) conference or conversation situation, with several microphones “live” but only one speaker talking at a time, each Input control should be set so that each speaker results in approximately the same amount of compression, observing that the overall level is correct for proper Gated Memory action.
FUNCTIONAL BLOCK DIAGRAM - FIGURE 3
THEORY OF OPERATION (Cont’d) maximum of 30 dB, the second potentiometer section acts as a conventional voltage divider output attenuator for low control settings. The input transformers increase the signal voltage by 21 dB. Input 1 has a second line input, phone jack J12, which operates only in the LINE position of S9. Additionally, this stage (Q109, 110, 111) may be converted to a level-stabilized, low distortion, 1 kHz Wien bridge tone oscillator.
SCHEMATIC DIAGRAM - FIGURE 4A
SCHEMATIC DIAGRAM - FIGURE 4B
SCHEMATIC DIAGRAM - FIGURE 4C
SCHEMATIC DIAGRAM - FIGURE 4D
SCHEMATIC DIAGRAM PIN CONNECTIONSTOP VIEW INTEGRATED CIRCUIT MC201 AND MC301 FIGURE 4E REPLACEMENT PARTS FOR SE30-TABLE 1 NOTE: THE COMMECIAL ALTERNATES SHOWN ABOVE ARE NOT NECESSARILY EQUIVALENTS, BUT MAY BE USED IN THE EVENT THAT DIRECT FACTORY REPLACEMENTS ARE NOT IMMEDIATELY AVAILABLE. TO MAINTAIN SPECIFICATIONS AND RELIABILITY, SHURE FACTORY REPLACEMENT PARTS SHOULD BE USED. FOR REPLACEMENT, PURCHASE Q502-Q503 AND Q510-Q511 AS MATCHED PAIRS TIS92M-TIS93M.
TABLE 1 (Cont’d) NOTE: THE COMMERCIAL ALTERNATES SHOWN ABOVE ARE NOT NECESSARILY EQUIVALENTS BUT MAY BE USED IN THE EVENT THAT DIRECT FACTORY REPLACEMENTS ARE NOT IMMEDIATELY AVAILABLE. TO MAINTAIN SPECIFICATIONS AND RELIABILITY, SHURE FACTORY REPLACMENT PARTS SHOULD BE USED. FOR REPLACEMENT, PURCHASE Q502-Q503 AND Q510-Q511 AS MATCHED PAIRS TIS92M-TIS93M. ORDER REPLACEMENT PARTS UNDER THIS NUMBER WHEN APPLICABLE. IF NO NUMBER IS SHOWN IN THlS COLUMN, ORDER UNDER SHURE PART NUMBER.
TEST VOLTAGES, P. C.
TEST VOLTAGES, TRANSISTORS - TABLE 2B 19
TEST VOLTAGES, INTEGRATED CIRCUITS TABLE 1C NOTES TO SCHEMATIC DIAGRAM AND TEST VOLTAGES (Figure 4, Table 2) 1. All capacitors shown in microfarads and 50 volts or more unless otherwise indicated. Electrolytic capacitors shown in mF X volts. pF = picofarad. 2. All fixed resistors ±10%, ¼ watt unless otherwise shown. K = 1,000 M = 1,OOO,OOO 3. Components and wiring enclosed within dashed lines are parts of printed circuit board assemblies. 4.
CHASSIS PARTS PLACEMENT FIGURE 5 21
PRINTED CIRCUIT BOARD 1 PRINTED CIRCUIT BOARD 2 PARTS PLACEMENT FIGURE 6A 22
PRINTED CIRCUIT BOARD 3 PRINTED CIRCUIT BOARD 4 PARTS PLACEMENT FIGURE 6B 23
PRINTED CIRCUIT BOARD 5 PARTS PLACEMENT FIGURE 6C 24
SERVICE INSTRUCTIONS The SE30 Gated Compressor/Mixer uses components of the highest quality, operating well within their ratings to assure long life and excellent stability. No routine maintenance is necessary with the exception of battery replacement. CAUTION: There are no user serviceable parts within the case of the SE30. Refer servicing to qualified service personnel. BATTERY REPLACEMENT: No special tools are required. 1.
SERVICE INSTRUCTIONS (Cont’d) push-on retainers so that it may be raised above the chassis for service without complete removal. With all power turned off, depress retainer locking tab, if any, and pry each corner of the board from its retainers. Lift the board straight up assuring that all wires clear any obstructions, and position the two lower board mounting holes over the two upper plastic retainers.
SERVICE INSTRUCTIONS (Cont’d) PROCEDURE: First, the meter (7) must be mechanically set to zero. Turn the Power switch (11) OFF and wait one minute. The meter pointer should rest over the mark at the left-hand end of the scale, left of the -20 VU and 0 dB Compression line. Using a small blade screwdriver, rotate the black plastic screw below the meter face to set the pointer, if necessary. The electrical calibrations may now be performed as outlined below.
SERVICE INSTRUCTIONS (Cont’d) C. Set the Meter switch (8) to VU and the VU Range switch (4) to +4. Adjust VU CAL trimmer potentiometer (R529) for a 0 VU meter reading. Calibration is complete. STEREO SYNCHRONIZATION Two SE30’s may be synchronized to operate together for two-channel stereo applications. With the Stereo Parallel jacks (23) connected together and the adjustment below performed, the two units will respond equally to the sum (left and right) signal to minimize apparent stereo image shift.
MODIFICATIONS Noise Improvement for Single Inputs: The overall signal-to-noise ratio of the SE30 may be improved for single-input applications by disabling the two unused input channels. This automatically reduces the noise level of the mixing circuitry without changing the gain or other characteristics of the remaining input. It is recommended that Input 1 be used and Inputs 2 and 3 disabled to retain the Tone Oscillator and Aux. Line Input features associated with Input 1.
MODEL A100A CARRYING HANDLE ASSEMBLY MODEL A100B RACK PANEL The Shure Model A100A Carrying Handle Assembly provides a means for conveniently carrying the Shure Model SE30 Gated Compressor/Mixer. The Model A100A serves as a handle for carrying the SE30, as a cover for the front panel, and as a tilt stand for positioning the SE30 at an angle for easy reading of the controls and meters.
