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MODELS SE30 & SE30-2E
GATED COMPRESSOR/MIXER
OPERATING AND SERVICE MANUAL
Copyright 1981, Shure Brothers Inc.
Printed in U.S.A.
27A8025 (AK) (90A8103)
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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.
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(Model SE30 shown) Automatic, noiseless switch-over to batteries in the DESCRIPTION event of ac line failure. The Shure Model SE30* Gated Compressor/Mixer is a Battery-check switch to check battery condition with- high-quality gated memory compressor combined with a out interrupting operation of unit. self-contained, portable, three-input mixer and remote Detachable ac line cord. amplifier designed specifically for professional appli- Auxiliary meter lamp operates independently from a “D” cation
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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 Re- sponse Rate set to 0 (fast), under 2% THD at 50 Hz. At 1 kHz, under 0.8% THD at any level of compres- sion 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. Compression Threshold: Microphone: -96 dBV at maxim
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SPECIFICATIONS (Cont’d) Power Switch: Controls ac, external dc and internal (11) battery power applied to the unit, but will not prevent Battery Operation: power from being drawn from the internal batteries by 27 volts nominal, 21.5 volts minimum. Current con- a load connected to 30 Volts DC jacks (26) when sumption at 27 volts, 10 ma. at no signal; 12 ma. at switched to OFF. 20 dB compression and +8 dBm output. REAR PANEL Battery Life: Mix Bus Jack: Phono pin jack allows adding inputs by Estima
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CONTROLS AND CONNECTORS FIGURE 2
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(25) AC Power Receptacle: Special internationally ac- inputs (13) will accept balanced 600-ohm line signals. cepted connector for detachable ac line cord, three- Inputs are bridging (with 66 K ohm impedance) so that wire with safety ground pin. higher impedance sources such as Aux. signals (up to (26) 30 Volts DC Jacks: May be used for powering the 33 K ohms) may also be used. For such unbalanced in- unit from an external 30 ± 20% dc source, or for puts, the signal may be applied to pin 3, with
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GENERAL OPERATION (Cont’d) to the microphone. This adjustment is very important to insure proper operation in situations having very The “Tip” connection of the headphone plug will be in high background noise levels, such as sporting events phase with Pin 3 of all Input (13) and Output (16) connec- or parades. tors, and with the tip of the Mix Bus jack (12). TYPICAL SET-UP AND OPERATION A typical set-up and operation procedure is described OPERATING CONSIDERATIONS for remote amplifier applicatio
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OPERATING CONSIDERATIONS (Cont’d) SPECIAL APPLICATION conference or conversation situation, with several micro- CONSIDERATIONS phones “live” but only one speaker talking at a time, each SOUND REINFORCEMENT Input control should be set so that each speaker results in approximately the same amount of compression, observing The SE30 may be used in sound reinforcement installa- that the overall level is correct for proper Gated Memory tions, but some care must be exercised in such applica- action. ti
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FUNCTIONAL BLOCK DIAGRAM - FIGURE 3
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THEORY OF OPERATION (Cont’d) network with an adjustable time constant so that a smooth dc voltage is generated, equal to the average value of the maximum of 30 dB, the second potentiometer section acts full-wave rectified pulses. This dc voltage is amplified as a conventional voltage divider output attenuator for low (X2) by the AC/DC Amplifier (MC201, Q105) and applied control settings. The input transformers increase the signal to the gate of the attenuator FET (Q401). The AC/DC Am- voltage by
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SCHEMATIC DIAGRAM - FIGURE 4A
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SCHEMATIC DIAGRAM - FIGURE 4B
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SCHEMATIC DIAGRAM - FIGURE 4C
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SCHEMATIC DIAGRAM - FIGURE 4D
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SCHEMATIC DIAGRAM PIN CONNECTIONS- TOP 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. ORDER REPLACEMENT PARTS UNDER THl
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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. 17 ORDER REPLACEMENT PARTS UNDER THIS NUMBER WHEN APPLICABLE. IF NO NUMBER IS SHOWN IN THlS COLUMN, ORDER UNDER SHURE PART NUMBER. REPLACEMEN
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TEST VOLTAGES, P. C. BOARD TERMINALS TABLE 2A 18
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TEST VOLTAGES, TRANSISTORS - TABLE 2B 19
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TEST VOLTAGES, INTEGRATED CIRCUITS TABLE 1C NOTES TO SCHEMATIC DIAGRAM AND 7. P. C. board terminals and wire destinations are shown TEST VOLTAGES (Figure 4, Table 2) as board number-pin letter. 1. All capacitors shown in microfarads and 50 volts or 8. First digit of three-digit component references (for more unless otherwise indicated. Electrolytic capac- example, R101) denotes number of printed circuit itors shown in mF X volts. pF = picofarad. board upon which part is mounted. One and two-digi
