Simplex 2001 Voice Communications Circuit Analysis

QSimplex Communications Analysis Simplex Time Recorder Co specifications other were Current as Of publication are subject change without notice 9 81 VOICE COMMUiWCATIONS SYSTEMS ANALYSIS OF CONTENTS Control Module 6005 Audio Power Amplifier 6001 Audio Power Amplifier 6002 Power Amplifiei6003 Power Amplifier 6004 Power Amplifier6014 Speaker Circuit Module 6009 Speaker Circuit Module 6011 Speaker Circuit Module 6013 Control Switch Module 6015 Circuit Selector Switch Module 6016 Circuit Selector Switch Module 6017,6018 8.6019 Audio Amplifier Monitor 6021 Audio Amplifier Monitor6025 Preamplifier Monitor6027 Preamplifier Monitor 6029 and Enclosure Module 6030 9 81 HAZARD electrIcal power when making any adjustments servicing should be performed by quali Simplex Representatives repairs VOICE COMMUNICATIONS ANALYSIS purpose of this manual is to analyze the circuitry of various modules and com used in 2001 Voice Communications Systems The wiring diagrams referred the headings just to the right of the type in each circuit analysis are indicated The wiring diagrams seen in other publications are cataloged ascending by the module type number The box found in the lower corner of these wiring identifies part no and WD no this manual and associated wiring diagrams system common is expressed as follows ov System Common System Common OV System Common 0V of these expressions negative side of the power supply a system common reference point connected 9 81 VOICE COMMUNICATIONS ANALYSIS CONTROL MODULE 841 302 continued provide dual switchable pre amplification and mixing of low level outputs produced Table l microphone or tape player so that the signal various tone oscillators the signal to noise ratio be further processed without appreciable degradation module also has optional switchable provisions pre ampli music and paging interfacing Audio Control Module which consists of two motherboards and 3 of four drawings indentified as part of 2001 6005 shown on sheets Sheet 1 of 4 WD No 641 306 a schematic showing components and circuits the motherboard Control with Pre amp Mixer OCPM Sheet 3 of 4 WD No 641 302 is a schematic showing components and circuits the motherboard Interface Music helpful Control Module is shown on sheets 2 and 4 of the four drawings of 2001 6005 operation of the 2001 6005 as understanding Sheet 2 of 4 WD No 641 301 is an interconnection identifying in and outputs of the OCPM Sheet 4 of 4 WD No 841 298 is an interconnection diagram showing the wiring the microphone transformer and outputs of the MIM 9 81 VOICE COMMUNICATIONS ANALYSIS CONTROL MODULE 841.302 confinued 20011 Diagram 1 TONE USED 6005 407 400 Whoop Coded or Free Running Horn 308 i 308 l 308 energized by relay K5 energized by Command Switch if used Function Interface Stop Relay 1 2 Command Switching 308 a41 308 308 1 preamplifier stage 2 preamplifier stage off by higher priority JFET for microphone to chan JFET for microphone to chan 9 81 timed VOICE COMMUNICATIONS ANALYSIS CONTROL MODULE 841 302 continued tones are developed by two of the various available pluggable oscillator located in the alarm 1 and alarm 2 positions The output of alarm 1 oscillator fed to the primary pre amplifier stage via ICl a quad bilateral switch which is turned by a high applied to its gate The output of alarm 2 oscillator the pre amplifier stage The outputs of optional oscillator boards that may be in auxiliary 1 and auxiliary 2 locations are also fed through to the primary stage when directed by a remote input The quad bilateral switch is in conjunction with relay contacts and matrix diodes to gate one of three possible to the primary pre amplifier channel This control circuitry selects proper signal auxiliary tone or music command when directed by a remote input Relay Kl K2 K3 and K4 together with selected diodes comprise the priority coding with the following priority order fed directly Microphone Operation Tape Player Operation Automatic Alarm or Manual Alarm Auxiliary Tone l Auxiliary Tone 2 Music Command first operational amplifier op amp stage of each channel IC2 and lC3 performs mixing of three possible inputs Each input has its independent gain adjustment channel has two low impedance Each of three inputs have a low pass filter tied to the op amp input resistors The band of these stages is much greater than the required system bandwidth and one high impedance second op amp stage of each channel has unity gain and limits 3db point to 10K Hz by C20 and C22 upper band 9 81 VOICE COMMUNICATIONS ANALYSJS CONTROL MODULE 81841 302 continued monitored by the Dual Pre Amp Monitor not shown output of each channel not part of the 2001 6005 Audio Control Module It is a Dual Pre Amp Monitor card mounted the event of failure of the channel the Dual Pre Amp Monitor energizes relay K6 on the 2001 6005 Audio Module The output between pins P2 2 Sig Ref and P2 4 OV is transferred the secondary channel the 2001 6030 Mike Enclosure second application used with dual amplifiers equipped with backup does not utilize relay switchable output This second application uses both outputs simultaneously