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Shure Brothers Incorporated
222 Hartrey Avenue
Evanston IL 60202-3696 U.S.A.
Model M267 User Guide
Direct mix bus for stacking units
Automatic muting prevents speaker damage during
turn-on and -off
Low distortion, high-stability tone oscillator for line test
and level checks
All connections phased. Line output terminals phase-
indicated
Compact and lightweight, with rugged, abrasion-resis-
tant case
Internally selectable 120 or 240 Vac, 50/60 Hz opera-
GENERAL
tion
The Shure Model
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Outputs Headphone Output Clipping Level IMPEDANCE 3.16V (+10 dBV) into 200 Ω Designed for Actual Output Tone Oscillator Use With (Internal) Output Clipping Level Microphone Any low imped- 0.5 –34 dB 1,000 Hz, 1.5% or less THD ance microphone (20 mV) input Phantom Power Mix Bus 3.5 kΩ 3.5 kΩ –8 dBV (400 mV) Head- 8 - 2000 Ω 400 Ω to +10 dBV 30 Vdc open-circuit, 3.3 kΩ series resistance, input phones 200 Ω 3 kΩ** (3.3 V) switches in MIC position only recommended Line 600Ω 150Ω +18 dBm Operatin
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CONTROLS AND CONNECTORS Input control 1 serves an additional function as the level control for the tone oscillator when the INPUT 1/OCS 1 switch is in the OSC 1 position. WARNING IMPORTANT: For optimum signal-to-noise ratio, the indi- This apparatus must be earthed (grounded)! The vidual input controls should be operated at as high a set- M267 power supply is energized when the unit is ting as possible, consistent with maintaining adequate connected to an ac source; disconnect mains control ra
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Mix Bus Phantom Power Direct access to the mixing bus is provided through the The rear-panel PHANTOM OFF/ON switch controls the rear-panel MIX BUS phono pin jack. This provision is made application of phantom power for condenser microphones, such as the Shure SM81 and SM87A, to all inputs. With primarily to facilitate stacking or “multing” M267s to achieve additional input capacity without losing any inputs. the switch on and the rear-panel MIC/LINE switches in the MIC positions, +30 Vdc is app
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Telephone Line Surge Protection 3. Locate the voltage selector switch (S201) at the right rear of the main printed circuit board (Figure 3). Move When using the M267 connected directly to a telephone SD201 to the 240V position (toward the front panel). line subject to lightning-induced voltage surges, the follow- ing commercially available part can be installed across the LINE OUT terminals to provide additional protection for output circuit components: WHT BLK 120V Metal Oxide Varistor, Genera
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PRINTED CIRUCIT BOARDS COMPONENT SIDE INPUT TRANSFORMERS T201-T204 6
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REPLACEMENT PARTS LIST REFERENCE PART COMMERCIAL REFERENCE PART COMMERCIAL DESIGNATION NUMBER DESCRIPTION ALTERNATE DESIGNATION NUMBER DESCRIPTION ALTERNATE C101,C209, 86T628 Capacitor, Electrolytic, 5 μF, 25V Sprague TVA 1303 PL301-PL302 95A8010 Lamp, 6.3V, 0.2A Sylvania 86 C219, C227, Q201 86A350 Transistor, NPN Motorola 2N5210 C232 C115 86L628 Capacitor, Electrolytic, 250 μF, 50V Sprague Q202, Q204 86A334 Transistor, NPN Rohm TIS92 501D227F063PR Q203, Q205 86A348 Transistor, PNP Motorola 2N5
