Sparta CENTURY Series Technical Manual Download Page 29 | Manualshive

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Summary of Contents for CENTURY Series

Page 1: ...IJ ELECTRONIC CORPORATION CENTURY SERIES Models 4510 4515 4520 and 4525 Tape Cartridge Reproducers 5851 FLORIN PERKINS ROAD SACRAMENTO CALIFORNIA TELEX 377 488 CABLE SPARTA 916 383 5353 A Division of Computer Equipment Corporation ...

Page 2: ...ietary data is contained herein Neither this document nor the information contained herein shall be disclosed to others for manufacturing or any other purpose except as authorized in writing by Sparta Electronic Corporation 1973 098 4510 5 00 g p lf ELECTRONIC CORPORATION 5851 FLORIN PERKINS ROAD SACRAMENTO CALIFORNIA 95828 A DIVISION or COMPUTE R EQUI PM ENT CORPORATION ...

Page 3: ...g FREQ RESPONSE v Mech oper tion Press Roller Adj MONO LEF T CHA NNEL v Fuce Power Supply Voltage Playback 50Hz S db 75Hz 1J db 150 Hz b db Azimuth Adj Play Back v Equalization set Play back IL__ __ t J d b_m_R __ _ ___ _dbrn Output evcl 600 ohms _ L __ S 6 JJt 5 R Signal Noise ow Flutter _ LL w c T ue Amp Sensitivity one Output Remote Control Start Stop 150 Hz End of Mess age Jnd Lamp use Power S...

Page 4: ...ATURES INTRODUCTION GENERAL DESCRIPTION 1 3 SPECIFICATIONS 5 INSTALLATION UNPACKING ENCLOSURES 0 AUDIO CONTROL CONNECTIONS OPERATION 0 CARTRIDGE INSERTION READY INDICATION CARTRIDGE PLAY CARTRIDGE STOP 6 6 7 8 8 8 8 CARTRIDGE RELEASE 9 E 0 M INDICATION 9 ...

Page 5: ... PINCH ROLLER PRESSURE 12 CARTRIDGE RELEASE 12 ARMATURE RETURN STOP 13 ROTARY LIFT MECHANISM 13 FLYWHEEL THRUST BEARING 13 FIGURE 1 UPPER VIEW MECHANISM 14 SOLENOID ASSEMBLY DRAWING P 3 8 14 a REPLACEMENT ALIGNMENT OF TAPE HEADS See drawing P 120487 TRACK CONFIGURATION 15 HEAD LOCATION 15 TRUE TANGENT 15 HEAD REPLACEMENT 16 HEIGHT ADJUSTMENT 16 ZENITH ADJUSTMENT 17 AZIMUTH ADJUSTMENT 17 ...

Page 6: ... 22 BELT CHANGE 23 CIRCUIT DESCRIPTIONS POWER SUPPLIES See drawing S 154 24 CONTROL CIRCUIT See drawing S 150 25 CUE TONE DETECTORS See drawing S 156 26 CUE LOCKOUT See drawing S 150 S 156 PROORAM AMPLIFIER See drawing S 157 WARRANTY SCHEMATICS S 154 POWER SUPPLIES S 150 CONTROL CIRCUIT S 156 CUE TONE DETECTORS S 157 PROORAM AMPLIFIER P 34 INTERCONNECTING DIAGRAM 0 27 28 ...

Page 7: ...ndard 3 track head The top track is the left program channel the lower track is for cue tones In the recording process a 1000 Hz cycles per second tone of about 1 second duration is automatically recorded on the cue track each time the cartridge transport is started in the record mode Each reproducer is furnished with a detector circuit which responds to this tone by stopping the transport This cu...

Page 8: ...nut grain finish Bottom plates with no mar rubber feet are provided with table top configurations and must be removed for use in the triple rack mount or quad cabinet Each module can slide forward in the rack mount and quad cabinet for convenient access to all adjustments and for head cleaning Additionally the rack mount has front panel lock screws to secure the modules and removable tabs on the r...

Page 9: ...in both the program and cue amplifiers to provide best performance while minimizing the number of components required The IC s are interchangeable between all circuits and are plug in for ease of trouble shooting in case of a malfunction A 1700 rpm hysteresis syncronous motor is utilized in Century Series reproducers and runs only when a cartridge is inserted The inherently smoother high speed mot...

Page 10: ...e generator 4720 stareo record with standard 1000 Hz stop tone generator 4725 stereo record with added 150 Hz EOM tone generator Remote Control of start stop functions is available on the barrier strip at the rear of each reproducer module Audio outputs are also taken from the barrier strip Additionally an amplified cue channel output is provided which can be used to check cue tones as well as con...

Page 11: ...mary cue stop l KHz standard second ary cue EOM 150 Hz optional EOM signal provided as Form A contact closure 5 7 5 ips shielded hysteresis synchronous motor non magnetic dynamically balanced flywheel multiple belt flutter filter drive system 2 seconds to 10 1 2 minutes NAB size A cartridge All functions available Single desk dual desk 7 rack mount adaptor for 3 modules custom walnut grain cabinet...

Page 12: ...e incurred in shipping but the claim must be promptly filed by the receiver ENCLOSURES Table top units are shipped with lids installed fiowever Triple Rack Mounts and Quad Cabinets are shipped separately from the transport modules The modules slide in from the front and in the Triple Rack Mount can be fastened in place by turning the front panel lock screws clockwise There is a tab on the rear of ...

Page 13: ...Out 2 Left Channel Audio Out Monaural 3 Common Shield 4 Right Channel Audio Out 5 Right Channel Audio Out 6 Common Shield 7 Decod r Out cue track audio 8 Remote Stop mom sw to 25 9 2 5 vdc 10 Remote Start mom sw to 25 End of Message Contact Closure Optional End of Message Contact Closure 12 7 ...

Page 14: ...ion The motor starts when the cartridge is inserted and requires approximately 2 1 2 seconds to reach operating speed Depress the right side of the Touchbar to start the cartridge The bar will glow green indicating a play condition The Touchbar should not be tapped to start a cartridge as the spring tension of the switch contacts may cause the bar to bounce back and actuate the stop contacts momen...

Page 15: ... released by lifting the end of the cartridge that extends through the front panel Pause momentarily to let the pinch roller retract before withdrawing the cartridge The cartridge cannot be released while being played On reproducers equipped with the optional secondary cue tone detector end of message signal a visual indication of the presence of the tone is provided When the tone is detected the ...

Page 16: ...urther adjustment should be required until considerable head wear has occurred The control s should then be adjusted for flattest response during playback of a frequency response test cartridge If no test cartridge is available the equalization should be set to produce natural sounding high frequencies R23 is the left channel mono equalization control Both can be reached through the access hole in...

Page 17: ...l The control can be reached through an access hole in the p c board cover if adjustment is necessary An accessory a c outlet is provided on the rear of each reproducer module so that a single power cord can supply operating voltage to a group of modules Each module is simply plugged into its neighbor and the power cord from the last one plugs into the wall outlet The accessory outlets are not fus...

Page 18: ...ter tightening the screws PINCH ROLLER PRESSURE Make adjustments in the following sequence a Raise the pinch roller and operate start switch b Loosen the catch plate screw c Insert screwdriver blade into the notches in the edge of the rocker arm and catch plate d Twist the blade counter clockwise to increase pinch roller pressure e Tighten the catch plate screw when the capstan indents the pinch r...

Page 19: ... screw out in small increments until a cartridge held against the stop screws will barely pull tape solenoid turned off Now turn screw clockwise 1 8 turn The cartridge should not pull tape with this setting Try several cartridges to confirm that adjustment is correct Recheck adjustment of pinch roller FLYWHEEL THRUST BEARING The flywheel thrust bearing is a nylon screw in self locking threads in t...

Page 20: ...Com 0 ROTARY L FT M Ct AN SM AL C ST A SCRGW CAPSTAN 0 STOP SCRG WS o VC 41 R OLLER 14 ARMATURE I PLUNGGR ASSEMBLY ARMATt RG RE TURN STOP AL t ST PIVOT ARM NOTC 1 S CATC L PL 4T CATCH PLAT 5CR W RELEASE AL t 5T t OCK Nt T j ...

Page 21: ...w SteamPoweredRadio Com 0 0 0 0120621 IIUSHING 0l20H5 DAMPING l AD 01206H Sl lllNG ARMATUH HTUIIN 14A 0120620 IIIIACKIT SACRAMENTO CALIFORNIA 9151211 _______ mu CENTURY SER E S SO NOID A S E Me Y NO P 35 ...

Page 22: ...ion called True Tangent recording in which the record head is rotated 5 clockwise as viewed from above compared to the reproduce head The result is a more consistent high frequency recording characteristic As the tape is pulled around the corner post of the cartridge it tends to move out from the corner post so that the tape travels an arc of more than 90 Therefore with conventional record head mo...

Page 23: ...coding when connecting clips STE REO HEAD RED Q 0 ORG BRN 0 0 GRN YEL 0 0 BLU REAR VIEW HEIGHI ADJUSTMENT Height is the vertical positioning of the head relative to the tape guides so that the pole pieces are equally spaced from the tape center line Once this adjustment has been made it will normally suffice for the life of the equipment even if new heads are installed Height can be checked by rem...

Page 24: ...t Azimuth adjustment is necessary to reproduce high frequencies due to their short wavelengths The SPARTA AG 2 Alignment Gauge can be used to achieve near optimum Azimuth alignment optically For exact alignment a test tape such as the SPARTA AL 1 Alignment Cartridge should be used The AL 1 cartridge provides a 12 000 Hz recorded tone which can be monitored for maximum program output while adjustin...

Page 25: ...rongly recommended This procedure also requires an oscilloscope and a c VTVM If these facilities are not available it is suggested that the reproduce head Azimuth be adjusted using a 12 15 KHz alignment cartridge while monitoring the left channel Align the record head Azimuth using a signal generator applying a 12 000 Hz tone to the record amplifier left audio input The reason for using the left c...

Page 26: ...ection amplifier s To determine the correct in phase display connect a signal generator simultaneously to both the horizontal and vertical inputs of the oscilloscope FIG 1 A 0 CORRECT C 90 D 180 The reproduce head Azimuth should be adjusted to produce the best pattern least phase shift Plus or minus 10 is entirely satisfactory The same cartridge can now be used as a station standard for Azimuth ad...

Page 27: ...I i ri I 1 f ll IJJ v z 0 Cl I 0 I LI Y _ 0 X w I Ii I fl tJ I 1 z r lJ z 4 1 IJI 1 L 0lf lL l f _ _ J eL r I 11 L If I q J z 0 1 _j 9 L 0 0 0 0 Q J I 0 N ru I 1 Ii l J 1d I _ 10 Cl 1 Cl r tll I 0 L L z I J 0 0 0 __j 2 z I io ii J i Ll v f l td _ lJ 11 l c J 9 r 0 iJ J 0 _ J 0 0 0 0 N 1 1 I cl X I 1 CL l 4 N N J r 1 0 _ _ 1 l I J 2 0 IJ t N ll _l o 1 L I i l 1 oc r u 0 4 fJ 0 O lO I I i 0 5 r Lj R...

Page 28: ... usually observed when the announcement is heard in stereo Phase shift often occurs in the record playback of cartridges as the result of skewing of the tape Skewing uneven alignment of the tape across the record and reproduce head is fairly common in most cartridges Further there is considerable variation in tape guidance from cartridge to cartridge of the same brand apparently due to the molding...

Page 29: ...unit The SPARTA DM 200 is available at a nominal cost and will extend the life and quality of cartridge recordings CARTRIDGE CARE Because of the inherent friction present in tape cartridge systems the tape is subject to considerable wear Both the lubricated and oxide side of the tape gradually deteriorate Cartridges of 5 10 minutes length can usually be used for several years before the tape must ...

Page 30: ...eads e Remove P C Board f On the record playback units remove the connecting tab between the record and playback chassis g Remove the screws securing the deck plate to the chassis Total of six screws h Remove the button from the cartridge release arm i Raise deck plate being careful not to damage wiring If sufficient clearance cannot be obtained to provide access to the belts the P C plug can be r...

Page 31: ...decreasing the current through Q2 which maintains the load voltage at the original value The regulated voltage set point may be 21 26 volts de due to component tolerances and should be considered normal if it falls within this range Current limiting is provided by a 10 ohm 1 2 watt resistor R4 The value of resistance and wattage was purposely chosen to be the weakest link in the power supply in th...

Page 32: ...saturates Q8 which turns Q7 on connecting the coil of Kl to the 25 vdc line Resistor R48 provides the latching current for QS so that the relay remains energized The stop switch Sl connects 25 vdc to the base of Q7 which turns it off and removes the voltage to Kl Q8 also turns off since the latching current is removed The relay drive can also be turned off by 1000 Hz stop tones on the cartridge cu...

Page 33: ...tected the relay driver turns off the control relay Kl stopping the tape by turning off the pinch roller solenoid The optional 150 Hz E 0 M end of message detector consists of an integrated circuit active filter and relay driver The filter passes only the 150 Hz tones which are rectified integrated and coupled to the base of Ql0 in the relay driver circuit When a 150 Hz tone is detected Ql0 starts...

Page 34: ...e tone detector s for approximately 2 seconds after a cartridge is started When the transport is stopped but ready 25 vdc passes through n c contacts 9 10 of Kl charging an RC circuit at the base of Q9 turning off the transistor Diode switches DS D6 conduct to ground disabling the tone detector s When the transport is started 2 5 vdc is removed from the RC circuit However Q9 remains off until C38 ...

Page 35: ...n of 35 dbm the output of which is coupled through capacitor C4 to the input of IC2 an integrated circuit voltage amplifier with a gain of 30 dbm This is then coupled through resistors Rl2 and Rl3 to bases of transistors Ql and Q2 which are used in the complimentary mode as current amplifiers The output is then fed through capacitor C8 to transformer Tl which provides a balanced and isolated outpu...

Page 36: ...on transformers reactors and filter chokes carry an extended warranty of 50 of the replacement cost being allowed should failure occur during the second year The foregoing express warranty does not apply to any products manufactured by Sparta that have been repaired worked upon or altered by persons not authorized by Sparta or that have been subject to misuse negligence or accident or the serial n...

Page 37: ..._ _ _ _ _ _ _ _ _ TAPE START SOlENOID 23K19C ORTRIAD I F45X b ll l W05 REGULATED 7 Pl Fl I C30 50 R44 1 8K Q6 2N2102 as 2N3054 I I I e I Pl C C32 35 I I l r c31 oa l f 1 1N 750 I I 35 27V I Pl IC I i 25V t_ 065 7041 PLAYBACK BOARD _ _ _ _ _ _ _ _ _ _ _ _ _ j SACRAMENTO CALIFORNIA 95828 a Ol IIUON o cmaoutr1t UIYlf Ml n n G I I TITll UNREGULATED REGULATED POWER SUPPLY PLAYIACK CENTURY SERIES SCALI ...

Page 38: ...P f EcB27 1c a 3 I C35 L R53 7 30 L J K I CART SENSE I II Jna 1 12 A 7 _j_ I I I I I I L CUE LOCKOUT CONTROL LINE SWITC H _ L _ _ _ _ J o 25 voe SW l T81 9 I G S3 3 R55 ll 220 CONTROL _ QJ 4 C B li P C IOARO STOP START P lC 1819 J 1819 S3 S D 150Hz cue signal indicator To record board preset line TB 1 is barrier strip on chass s rear panel To LCR lamp Key lKHz osc Record preset clear Relay shown i...

Page 39: ...ll DECODER OUT LOCKOUl t _ 1 ____ _ D 7 I I I 150Hz I GAIN I I I I I I I L ___ _ D2 IN4 57 ClO 0 1 i 1 4t M R13 620K ca C9 Cll 1 2 2 D4 IN45 R18 12K OPTIONAL 150Hz AUX TONE DETECTOR IN4004 I Ml 7P lM D5 IN4004 P l J V o P lH K2 AZ 530 06 2 I I I I I R12 1 _ _J 022I T 022 3 9K I l I Tllll S AkTA ELECTAOllliC CORPORATION CENTURY SERIES CUE DETECTOR SACRAMENTO CALIFORNIA 95828 SHT J OF J PLAYBACK DWG...

Page 40: ...LS QC 6 2 5 4 3 709 BOTTOM VIEW IMPORTANT C12 B E C TRANSISTOR BOTTOM VIEW cu ICI All DC READINGS MUST BE MEASURED WITH 20 000 VOLT VOM All AC MEASUREMENTS TO BE MADE WITH HEWLETT PACKARD 400E OR EQUIV G MEASUREMENT ON SECONDARY OF T1 T2 ISTAKEN WITH A NOMINAL 600A LOAD G TO CONTROL BOARD R29 0 1 X Q A v 0 2 5 _ 10 J V v 02 0 s l 4 0 1 V r O 3 s AkTA EucnKINIC CORPORATION SACRAMENTO CALIFORNIA 958...

Page 41: ...CUIT BOARD CONNECTOR fold line TB 1 12 ENO OF MESSAGE 11 START 25V STOP TONE COMMON RIGHT CH RIGHT CH COMMON MONO LEFT CH 10 9 8 7 6 1 I 5 4 3 LEFT CH LJ BARRIER STRIP REAR PANEL PLAYBACK 5 3 11 5 I I 6 1 I 3 41 1 _ j RECORD CONTROL SOCKET V2AMPS Bo FUSE Sf I I I L J1 PIN S of P 1 RECORD PRESET AC OUT 2 PIN 8 of TB 1 STOP 3 Kl N C 4 Kl N Q 5 TB 1 6 COMMON G CAUTION JNOT FUSED NOT SWITCHED TITLE C ...

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