M475A — Stereo Monitor Module

M4ZSA STEREQ MON TOR_MODULE Inputs Five stereo inputs are fed through interlocking selector switch SwI The balancec left channel input couplec through and C2 buffer amplifier U1 Similarily the right channel input coupled through and c8 buffer amplifier U2 The buffer amplifier outputs are coupled through stereo level control R1S/R16_ and C12 the The left and right mon toring channel signals couple off the arms RIS/R16 the SA14-140 Dual Booster Amplifier Solo/Talkback solo talkback input also.

provided 15 part M475A _ The solo input appearing pins connected from the sole mixer bus, input channels the mixing console the module connector which associated with the The talkback input appearing module connector pins I8M dBm source feed from externa console inputs Bridging resistors R3I/R32 feed this signal the buffer/mixer amplifier u3 _ The output irom u3 coupled through C2o controi R4O_ The output from this level control assembly as weli soloftalkback level fed the SA1A-1L0 Solidstate Sw itching the SA14-140 makes the selection either the main mon tor channel program feed the solo/talkback feed Solo/ Talkback Control The control for the solidstate swi tching on the SA14-140 assembly for the selection program stereo_ program mono solo/talkback inputs determined by logic gates Ub_ mono switch Sw6 and the solo/ talkback control input module connector pin Solo control appearing pin derived from U4C' output Pin This makes the selection between the stereo inputs and the solo/talkback input The program control pin and the output from U4 pin the other half the control input for selecting program the soio talkback signals

M4ZSA_STEREQ MONITOR MODULE DESIGNATION Labels stereo module source selections Odd numbered sources are assigned the left channel and even numbered sources are assigned the right channel SOLO/TALKBACK_TALLY DS2 illuminates when the soi0 vated talkback function acti- MUTE The Mute pushbutton cuts off the mon tor output feed . The mule function may be activated by the integra module push- button the external control circuitry MONO The Mono pushbutton switch comb nes the Left and Right stereo signals tha the stereo outputs from the mon tor module consist the L+R signai components SOURCE SELECTORS The interlocked pushbutton source ector allows five differ- ent stereo sources mon tored These typically are: Master 1/Master Sub {Sub Sub 3/Sub External (Left and Right) External (Left and Right) SOLO/TALKBACK_LEVEL This control determines the solo/talkback signal level fed into the mon tor ing system MON TOR LEVEL Sets the output signal level from the mon tor module for the source selected

M475A STEREO MONLTOR_MODULE DES GNATION Labels stereo module source selections. Odd numbered sources are assigned the left channel and even numbered sources are assigned the right channel SOL OLTALKBACK_TALLY DS2 iuminates when the solo vated talkback function acti- MUTE The Mute pushbutton cuts off the mon tor outpue feed The mute function may activated by the integral module push- button the externa control circuitry MONO The Mono pushbutton switch comb nes the Left and Right stereo signals tha the stereo outputs from the monitor module consist the L+R signal components SOURCE SELECTORS The interlocked pushbutton source selector allows five differ- ent stereo sources be nion tored These typically are Master 1/Master SuD /Sub Sub 3/Sub External (Left and Right) External (Left and Right) SOLO/TALKBACK LEVEL This control determines the solo/talkback signal level fed into the mon toring system_ MON TOR_LEVEL Sets the output signal level from the mon tor module for the source lected

M475A STEREO MONITOR MODULE Note: Specifications are based voltage evels 600 ohm system un ess otherwise specified. Gain: Monitor Solo: dB +/-0.5 dB _ dB +/-0.5 dB _ Frequency Response: +/-0.15 dB from Hz kHz _ Noise: dB below nominal output measured over Hz dBm kHz bandwidth) Harmonic Distortion: Less than 0.159 from Hz +24 dBm output less Less than 0 .

059 at kHz kHz +24 dBm output. Source Impedance: Monitor Solo 600 ohms less balanced/unbalanced. 30k ohms balanced_ Input Impedance Monitor Solo Talkback: 30k ohms balanced_ Less than onms summing input) _ 78K ohms balanced Input Level dBm nominal Output Impedance : 50 onms balanced Load Impedance : 600 onms balanced Output Levels: dBm nominal +26 dBm maximum Channel Separation: Phasing: dB _ Low number the input pair in phase with the low number the output pair.

Power Requirements: 25V MA nominal, +24 dc 120 mA _ MA maximum. Ambient Temperature: degrees Celsius Dimensions: 60" (41 mm 7.00" high 178 mm 165 Mm 50" deep Weight: Ibs (0.538 kg) IZ

M47SA STEREO MONIIOR MODULE PART DESCR IPTION MFG MFG PART NUMBER R1I R1z R13 R1L R1S) R16 ) Resistor I/4w 596 22k 22k 22k 9K1 Philips Potentiometer SK A/8 WBS 10-023 R17 RIg R2O Resistor 1/Lw53 E Potentiometer 5K Resistor 1/4w 5% 7 1 39K 39K 22K 22k 220 Philips R2I R22 R23 R24 R25 Piher PTIOV-Sk Philips R26 R27 R29 R3O R3I R32 R33 R3L R35 R36 R37 R38 R39 R4O 220 22k 22k SK SK Potentiometer Clarostat WBS 10-049 RLI R42 R43 R44 R45 Resistor 1/Lw 5% 30k 22k 10K 4K7 4K7 Philips 5-3