Sparta Century 4710 Technical Manual Download Page 23 | Manualshive

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Summary of Contents for Century 4710

Page 1: ...ls 4710 4715 4720 and 4725 Record Module Part of Models 4610 4615 4620 and 4625 R P Systems I f T S A Pt TA B Division of Cetec Corporation 4 _ I J _ t t I f I J t 5851 Florin Perkins Road Sacramento...

Page 2: ...4620 and 4625 R P Sy tern PROPRI TARY OTICE part El ctroni Corporation propri t ry data i contain d h r 1n ith r thi docum nt nor th inform tion ontain d h r 1n ha I b di clos d t th r for manufacturi...

Page 3: ...io Com I I I I I I I I I L I I I I I I I I I I I CONTENTS_ CENTURY SERIES FEATURES INTRODUCTION GENERAL DESCRIPTION SPEClFICATIONS I NSTALLJ TION UNPACYJNG ENCLOSURES AUDIO CONTROL CONNECTIONS RECORD...

Page 4: ...M REC ORD 8 RECORD LEVEL 8 SOURCE SELECT 8 TEST fUNCT IONS 9 RECORDING PROCEDURE 10 ELECTRONIC ADJUSTMENTS GENERAL 13 PROGRAM BIAS 13 PROGRAM BIAS TRAP 14 RECORD BIAS TEST CALIBRATION 15 PROGRAM RECOR...

Page 5: ...E O M TONE LEVEL TONE TEST CALIBRATION ENCODER LEVEL ELECTRONIC ADJUSTMENTS AND TEST POINTS P 42 CIRCUIT DESCRIPTIONS POWER SUPPLY CONTROL CIRCUIT RECORD CIRCUITS 150 Hz GENERATOR WARRANTY SCHEMATICS...

Page 6: ...erator These models include a recording h ad to convert the appropriate re producer module to a record pla yback unit Refer to the Reproducer Operating Manual for deta ils of installation and a lignme...

Page 7: ...ts Program bias levd can be adjusted through an access hole in the p c bourd cover A combination of discrete and integrated circuits have been used in the record circuits to provide best possible perf...

Page 8: ...NAB Standard Reference Level NAB Adjustable 3 selected by pushbuttons balanced bridging 10 to 8 dbm Program record level cue record level bias I I I I I I I 1 NAB l kHz stop standard 150 Hz E O M opti...

Page 9: ...es are fa stencd together for use with the Dual Lid and Triple Rack Mount A 10 32 x 1 2 machine screw secures the two modules together at the upper rear inside edges A cha ssis tie tab is used at the...

Page 10: ...individual movement of the record or playback module If desired the modules can be secured to the cabinet by means of angle brackets whic h attach to the upper part of the p c board covers The record...

Page 11: ...Common Shield I 7 Input 3 Left Channel I 8 Input 3 Left Channel 9 Common Shield I 10 Record Preset I 11 Record Preset 12 Record lamp I 13 Input 1 Right Channe l I 14 Input 1 Right Channel 15 Common S...

Page 12: ...ers below are for the record plug 1 Record Preset Line 25 in run mode 2 25 VDC from stop switch 3 25 VDC stop ready mode 4 25 VDC run mode 5 Common 6 EOM remote record normally jumpered to pin 5 cut j...

Page 13: ...M tones can be applied i n either the record or play modes This control adjusts the level of audio to the record am plifier The material to be recorded should be auditioned before recording and the l...

Page 14: ...eadings between 80 and 120 on the meter scale should be considered normal On stereo recorders only the left channel meter displays the tone test function The presence and level of bias to the program...

Page 15: ...tion applied with a soft clean cloth or cotton swab Insert the cartridge into the tape transport then start and stop the cartridge once or twice before pushing the Record button This will insure that...

Page 16: ...pcrating practice to select cartridges that are only slightly longer than the announcement to be recorded This minimizes the cue out time which means more efficient utilization of time during recordi...

Page 17: ...r the E O M tone has ended The E O M tone can be any desired length determined by how long the Record tutton is depressed However the circuit is designed to produce a minimum tone length of 5 second e...

Page 18: ...and a signal generator or test record 1 Insert erased cartridge into transport 2 Connect meter to ground and blue test point 3 Depress Record button momentarily 4 Adjust R80 for a reading of 64 milli...

Page 19: ...control for the same playback level at both frequencies Use a 620 ohm resistor across the audio output unless it is already feeding a terminated input of an audio console Requires oscilloscope or hig...

Page 20: ...tridge into transport 2 Connect meter across reproducer barrier scrip terminals 1 2 audio output or observe playback level on audi o console VU meter Put a 620 ohm resistor across the audio output unl...

Page 21: ...correctly equalized fer those units PROGRAM VU MCTER CALIBRATION Requires signal generator or test record a c voltmeter or oscilloscope or connection to audio console 1 Connect meter across reproducer...

Page 22: ...l of relay K2 4 Momentarily depress Record button 5 Adjust R41 to turn on relay K2 25 vdc a cros s coil I 6 Connect a c meter to ground and purple test point 7 Reading at test point should be 3 8 mill...

Page 23: ...til the cue bias re lay turns on normally at mid position of the control 6 Adjust C35 for mini mum indication of 68 KHz bias Requires high impedance a c voltmeter and d c voltmeter 1 Insert erased car...

Page 24: ...correct Requires high impedance a c voltmeter and d c voltmeter l Insert erased cartridge into transport 2 Connect d c meter across coil of K2 3 Apply signal tone to Encoder Input pins 22 23 on the re...

Page 25: ...c 34 C 0 R Ot RIO j o o B i 0 917 Q200 0 t 17 q s Q m m T 4 8 AS KJ MR P C 30 JRO NO ObS 7050 REV i 6 L M 9 QIO 16 It JI 0 99 7m Q 0 A Hz Cl 5 1 0 osc Riff Q 98 R 4 1 J 0Cyl4 2 5 0 7 5 0 96 150 z o s...

Page 26: ...00 ohms varies the output by 2 volts Transistors Ql Q2 arc current amplifiers The current limit is set by R4 which provides protection for the power supply components in the e vent of a short circuit...

Page 27: ...23 and turns Qll off until C23 recharges through R44 When Qll i s conducting it acts as a shunt across the 1000 Hz oscillator output When Q11 i s off the 1000 Hz signal passes to the Cue Amplifier whi...

Page 28: ...d by the adjustme nt of Rl 05 The c ircuit is duplicated in stereo systems Bias Oscilla tor This is a conventional 68Khz push pull oscillator wilh transformer coupled output Two reed relays Kl K2 swi...

Page 29: ...I I I I I I I I I I I I Each time a cartridge is started in the record mode Q 11 is turned off for approximately 1 2 second allowing the 1 000 Hz signal to pass to an integrated circuit summing ampli...

Page 30: ...ally closed section of the Record switch is opened Q3 turns on ta king the base of Q4 to near ground potential which turns Q4 off and QS on When QS turns on the transistor switch Q8 gates on the 150 H...

Page 31: ...mfd 230V Cart Guide Relay Control Kl 2 5K AZ428 70 4H Datacel 2P Sigma 301R2 24 4520 Play Solenoid Lamp Holder Lamp Start Stop CM 1819 Lamp 28V 4610 Fuse SA Slo Blo White Lens 4610 Illuminated Push Sw...

Page 32: ...lation transformers reactors and filter chokes carry an extended warranty of SO of the replacement cost being allowed should failure occur during the second year The foregoing express warranty does no...

Page 33: ...12 l I 22 T 1 R 25 ll 2 7 10 K Cll __ r 10K 10 R26 r is 1 470A_l_ C1 3 r R move Jvmper for refl o t e E O M co 4 D12 1N3 4A 13 r _ D10 1N400S m All tro n bton 2NS131 ENCODER INPUT 7 I To S 151 150 Ha...

Page 34: ...LEAD VERSION ONLY 1 o o z o z WlG SU f z o i I l _ _j_ O ooz lL ozo DIA J 4 0l0 TAG CRIMPED LEADS SPECIAL OROER ONLY TABLE 3 LENGTH H H1 238 378 258 397 278 421 278 421 298 437 338 457 338 457 MARKING...

Page 35: ...and high gain pream plifiers because less RF voltage or current is needed in such systems to cause interference With properly designed audio equipment particularly that in tended for use by radio bro...

Page 36: ...e in volved even 1 0 the extent of in cluding those of a completely separate carrier from ano ther source No maller how complex the symptoms however there are two factorscommon to all forms of RFI Fir...

Page 37: ...y which could add rather than cure RF I The pre ceding given value can be extrapo lated to other impedance levels simply by following the reciprocal rclation hip if the audio line im pedance is higher...

Page 38: ...s likely that partial or full detection would take place resulting in audible recognition of the AM component alo ng with normal program A sufficiently high level of RF however could com pletely block...

Page 39: ...www SteamPoweredRadio Com __ _ I I I I I I I...

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