Teac A-4000 Service Manual Download

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Summary of Contents for A-4000

Page 1: ...TEAC A 4000 STEREO TAPE PLAYER A 4010 STEREO TAPE RECORDER SERVICE MANUAL TEAC CORPORATION CA...

Page 2: ...that the head alignment has been altered as the following Fig 9 1 instead of previous Fig 9 REVERSE FORWARD PLAYBACK HEAD PLAYBACK HEAD AZIMUTH HEIGHT AZIMUTH HEIGHT ERASE HEAD RECORD HEAD AZIMUTH HE...

Page 3: ...Selma CONTROL BUTTONS MECHANISM ADJUSTMENTS ALIGNMENT AND PERFORMANCE CHECKS MAINTENANCE 2 wu TROUBLE SHOOTING e e e TRANSPORT MECHANISM WIRING DIAGRAM AMPLIFIER SCHEMATIC DIAGRAM RECORDING AMPLIFIER...

Page 4: ...alization 50 microseconds NAB for 71 2 ips 120 microseconds EIA for 33 4 ips Signal to Noise Ratio 50 db at 71 2 ips peak record level to unweighed Crosstalk 50 db channel to channel at 1 000 cps 40 d...

Page 5: ...COMPONENT LOCATION A 4000 PLAYER DECK AD FIG 1 A 4000 DECK...

Page 6: ...and for rewind Head Assembly Tape Lifter lifts tape from heads during fast wind operation Capstan drives tape in recording and play back mode Pressure Roller Pinch Roller drives tape with capstan Pow...

Page 7: ...ape is used Playback Preamplifier Output Jacks OUTPUT EQUALIZER TO AMP Socket for connection to the equalizer of the record amplifier Remote Control Socket TO REC AMP Socket for connection to the race...

Page 8: ...ntrol Line Level Control NOTE Level controls shown 62 63 and 69 above are dual potentiometers Inner knob Channel A is friction coupled with outer knob Channel B to be operated together or separately L...

Page 9: ...PLA Record Input and Playback Output Jack LINE Line Input Jack OUTPUT Output Jack TO DECK Socket FUSE 2 AMP Fuse The input signal to be recorded can be reproduced through head phones or speaker syste...

Page 10: ...ble and equal izer cable 5 Remove the case Q from the transport by removing four screws Qo 6 Turn the recorder and lay the recorder face up on a soft mat 7 Remove the following parts and hardware see...

Page 11: ...RA 40 RECORD AMPLIFIER...

Page 12: ...my a St on Oe Hibs Ma Ao ey Pr id eT a A y Cl e e 7 a anr i tee Sitti F jisei Pie SS a SO SH at S e 7 O ASS Gy i C A 4000 TAPE PLAYER...

Page 13: ...SU FT T AY Seco A a Baer A _ ES...

Page 14: ...PLAY marked When the reverse play button is depressed a The brake solenoid is energized freeing the turntables b Relays RL 2 RL 3 and KL 4 are energized c RL 3 reverses drive motor rotation by switchi...

Page 15: ...en the REC buttons of CHAN A and or CHAN B are depressed record relays RL 5 and or RL 6 are energized These relays apply voltages to the following points a B to the bias oscillator b Bias and audio si...

Page 16: ...ch roller pressure press the STOP button and using a string about 20 inches long tied in a loop Slip the loop between the pinch roller and roller arm so that the string rests against the pinch roller...

Page 17: ...6T CAPSTAN i et i PINCHROLLER 2 a S FIG 6 PINCHROLLER PRESSURE ADJUSTMENT...

Page 18: ...BACK TENSION J B REV BACK TENSION TO_LEFT MOTOR R 304 A REV TAKBUP TENSION B FORWARD BACK TENSION RED W RED GRN NOTE A or B DECREASE TENSION DIRECTION REV REVERSE FORWARD BACK actor REVERSE BACK TENS...

Page 19: ...op to the tape anchor on the reel hub and the other to a 0 to 4 oz spring scale 6 Operate the PLAY button and allow the clockwise motion of the left reel to draw a turn of string onto the hub 7 Make c...

Page 20: ...oop to the tape anchor on the reel hub and the other to a 0O 10 oz spring scale Wind several turns of string onto the hub counterclockwise Pull the scale making certain that the string does not touch...

Page 21: ...SPRING SCALE MOTION FIG 8 BRAKE ADJUSTMENT 39s...

Page 22: ...ough head assembly and observe the position of the tape at each of the heads Thread a piece of clear tape or recording tape with oxide coating removed across head assembly in the observed playing posi...

Page 23: ...WARD ERASE HEAD RECORD HEAD PLAYBACK HEAD PLAYBACK HEAD AZIMUTH HEIGHT AZIMUTH HEIGHT AZIMUTH HEIGHT AZIMUTH HEIGHT f 4 i j i ft PLAYBACK HEAD ERASE HEAD RECORD HEAD REVERSE FORWARD FIG 9 HEAD ALIGNME...

Page 24: ...OL my aS Www 0 BLANK _TAPE Blas alr o REC METER LEVEL CALIBRATE oe AUDIO 080 ERASE Ce RECORD C _ PERAK e FIG 10 0 ERASE 5 RECORD REV P B P_ FORWARD es OEE ERI8oecor ad bie eG a A4000 FRE AvP or s FIG...

Page 25: ...500 cycle reference tone 10 db below normal operating level adjust OUTPUT level control so that VIVM reads exactly 5 db 0 44V Playback Head Azimuth 5 Play 15 ke tone and turn azimuth adjustment screw...

Page 26: ...mal operation level and playback Adjust the playback level control to obtain O VU reading on the VU meter NOTE When the VU meter indicates 0 VU and the OUTPUT level controls at maximum position the ou...

Page 27: ...le recording a 500 cycle tone on tape adjust Channel A bias potentiometer VR7 Figs 37 and 38 for maximum output Then turn the bias potentiometer counterclockwise until output meter reading decreases b...

Page 28: ...osition and TAPE SPEED selector switch to HIGH 7 1 2 position 2 While recording a 15 kc signal on the tape set LINE INPUT level control so that meter reads 15 20 db below normal operating level 15 20...

Page 29: ...e LINE and MIC INPUT level controls to minimum Rewind the tape to the beginning portion of the 500 cycle recording Record the tape with LINE and MIC INPUT level controls at minimum position over the p...

Page 30: ...FREQUENCY WILL INCREASE WITH AN INCREASE IN R13 FIG 28 FIG ll A BLANK TAPE REC HEAD RA 40 RECORD AMPLIFIIR IN BASIC THREE STAt S CH A 7 1 2 TAPE SPIED MODE VR 6 SEMI FIXED by f Fd R15 eee R115 C65 OS...

Page 31: ...funk okies i toy i bake Alaa pend Pei E aah a te ee ee ED hE eda ee mate yh ae nkhes 3 i RECORD 50 100 200 i CSC SOCS 4000 2000 5000 10000 20000 FREQUENCY IN CPS PLAYBACK AMPLIFIER es a AUDIO OSCILLAT...

Page 32: ...cord amplifier voltage check chart If a check of the recording monitor circuit record input to line out put is required connect a signal generator to record input circuit and an VIVM across output jac...

Page 33: ...00 26 50 2SB257 NUMBER IS D C VOLTAGE MEASURED WITH 20 x0 V METER NORMAL OPERATING LEVEL IN DB O DB 0 775V ALL VOLTAGES MEASURED AT 117V WITH MACHINE IN STOP MODE 7 1 2 TAPE SPEED NOTE A 4000 PLAYBAC...

Page 34: ...TO ERASE HEAD Y d j 4 snHEAD 2SB200 20 00 25 00 IN RECORD MODE D C VOLTAGES NOTE NUMBER IS D C VOLTAGE MEASURED WITH 20 V METER CONORMAL OPERATING LEVEL IN DB 0 DB 0 775 V_ aT 500 CPS ALL VOLTAGES MEA...

Page 35: ...ormance of the equipment and to prevent the possibility of gradual deterioration of your recorded tapes CAUTION Do not allow the demagnetizer to come in close proximity with the level indicator meter...

Page 36: ...lying SAE 10 non detergent oil to the following points if there should be evidence of binding or dragging Capstan assembly top bearing 2 drops after every 300 hours of use Pinch roller bearing 1 drop...

Page 37: ...D C Pinch roller fails to contact capstan 1 DC fuse F2 open 2 Jumper plug not in remote control socket 3 Capstan solenoid 58 defective DC fuse open 1 Silicon diode D205 defective 2 Capacitor C202 C225...

Page 38: ...m W bY FH WOW and FLUTTER 1 Capstan assembly defective 2 Back tension improper 3 Drive belt on oil Pape spillage when transport is stopped 1 Oil on brake drums 82 or brakes 2 Brake springs weak or bro...

Page 39: ...cts on VR 6 4 Bias oscillator circuit defective Weak or distorted sound Foreign matter on heads Heads magnetized 7 2 3 Poor bias adjustment 4 Amplifier defective Power line too high when recording dis...

Page 40: ...IZATION vio RED C227 0 1 R306 120Q 0G W RED W RED GRN w BRN SPEED SELECT MoTOR BLK W RED BLK W GRN BLK SAFETY sw ai 3 f 5 r FUSE DC 1A CHAN B Dl REC HEAD iore ia 22 Se CHAN A He CHAN B ERASE HEAD ee C...

Page 41: ...A3 NVHO QW3H s s GmMj NVHO OV3H Aau VY NWHO GW3H GMi V NVHO GV3H R13 100K a a HOIH V NVHO NOILVZITVNO3 MOT Seu SITE us CN 3B for ee PsTetafefs s afes frofis ia is fia fis sa7fas A 4000 AMPLIFIER SCHE...

Page 42: ...RN BLK BLU WHT CHAN B REC HEAD CHAN A CHAN B ERASE HEAD CHAN A ac TO REC AMP EBAABMCOAMRE CIS BFR SMALE ST COMPONET VALUES ARE SUBJECT TO CHANGE WITHOUT NOTICE W r Fe CNS tao ee eg oe hs _ Y gael rJef...

Page 43: ...oy o J Ns Fa O S 2 U 8 92 ry g 2 2 3 3 zl oraz 5 na 107 25V R115 C62 Low d el R108 g C65 et es B a a HIGH 3 g p o 0 CNG SMR 882K RIGHT I 11P PLUG TO DECK LINE IN CNIO aie 309 2L VU METER FUSE 3 28200...

Page 44: ...topper 50 17003 Brake Mounting Base Shut off Switch Ass y Magnet Magnet Catcher 400 44323 Transport Selector Switch Ass y Tension Arm Ass y Reel Holder Reel Table Brake Drum Brake Guard Reel Motor Ter...

Page 45: ...u 2SB189 2SB200 FIG 4 LEFT CHASSIS ASS Y REF NO PART NO DESCRIPTION 613 23114 Left Chassis 614 27189 Rubber Cushion 615 48804 Relay Printed Board Ass y FIG 5 RIGHT CHASSIS ASS Y REF NO PART NO DESCRI...

Page 46: ...t Chassis Rubber Grommet Power Transformer Resistor Retaining Plate Tape Tension Adjust Resistor 2502 30W Back Tension Adjust Resistor 4008 30W Speed Selector Switch Capacitor Ass y Capacitor 0 1MF Tu...

Page 47: ...3 12238 Capstan Housing 4 12240 Metal Bearing 5 27166 Bearing Washer 6 12166 Flywheel 12 12231 Capstan Base 13 13333 Housing Leg wu 13335 Tape Guide 15 Tape Lifter Ass y 16 15160 Lifter A 17 15161 Lif...

Page 48: ...08 DESCRIPTION Transport Selector Switch Ass y Switch Mounting Chassis Special Screw M3x95 Leg Micro switch Capacitor 0 1MF Tubular Micro switch Push Plate Ass y 1 ly n Cushion SV Solenoid Retaining S...

Page 49: ...Roller Arm 27 15173 Pinch Roller Link Arm 28 14113 Double Nut A 4mm 29 14110 B 4mm 30 22004 Pressure Spring 31 12153 Pressure Adjust Screw 32 14135 Stopper 33 22036 Spring 704 E clip M4 705 7 M5 710...

Page 50: ...1583 44934 DESCRIPTION Sensing Post Ass y Sensing Cap Screw M3x35 iSensing A Insulation Bushing Sensing B Terminal Sensing Sleeve Insulation Washer Sensing Retaining Plate Insulation Washer N3 Termina...

Page 51: ...m Holder 73 27181 Rubber Cushion 74 18197 Tension Arm Base 75 18167 Limiter 76 18187 Arm Holder Nut 7 18133 Spring Hook 78 18198 Spring Retaining Drum 719 22041 Tension Arm Spring 21 27181 Counter Esc...

Page 52: ...unting Base 52 17201 Brake Lever A 53 17202 B 54 1790 Left Brake Spring 55 17189 Right Brake Spring 56 17180 Brake Band Retainer 57 Vinyl Pipe i 38 17203 Micro switch Retaining Plate 39 27179 Insulati...

Page 53: ...Y se Y 0095 AG 4AWV0 AY 11 0 W TAB 9 UIO Y Yoro N z frog N9 4W05 41V c00 0 13 PREAMPLIFIER CIRCUIT BOARD S EY ERLE vey VPP te oo a8 F FP TN 28 WYroyerer UIGE w e 0 Yoysy Boyer oN S Ss as Yow x 8 Yieo...

Page 54: ...42 13334 24039 13328 13316 13333 48031 Head Ass y Record Head Playback Head Erase Head Head Base Plate Bottom Shield Plate Head Mounting Plate A f n B n D Spring n 4 Tape Guide Leg hield Can A i B Hou...

Page 55: ...03 Pilot Lamp Socket 914 44 608 Micro switch Transiator 2SB257 915 Ly 2SB189 916 44407 Monitor Selector Switch t 2SB94 q17 43418 Jack 2SB425 918 23138 Micro switch Retainer a 2SB200 919 23136 Left Cha...

Page 56: ...SENSING REV Copstan Motor Relay Relay 0 1pF Osu 1002 Ol OyF OlpF OluF A 4000 FIG 14 RELAY CIRCUIT BOARD 200pF 50V 802 2W 2 R 1A ULL ke R 204B Reaie SD 0 uF ka 2 1A A 4000 FIG 15 POWER SUPPLY CIRCUIT...

Page 57: ...RA 40 FIG 6 BACK CHASSIS ASS Y EXPLODED VIEW...

Page 58: ...40 FIG 2 FACE PLATE ASS Y EXPLODED VIEW RA RA 40 FIG 3 FACE CHASSIS ASS Y EXPLODED VIEW...

Page 59: ...Soy S re a sseshuss ses mO NG wD NE Mi ae HER Sy AO SP CO hb oe Me sadi niil l N 4 na Seu tNleylh d RS SATII g d Saat S 8 SATIS Saxe g xX SS DBHESHDO WALLA As1 r 0S UNO G ty v05 UNG A9 W0s Yum Hors bE...

Page 60: ...RA 40 FIG 5 RIGHT CHASSIS ASS Y EXPLODED VIEW...

Page 61: ...80a 2w 200K 50 200p 50V 300 2W REC Relay CH UN 9 Uvoo 41S00 0 fc oS 9 is g 8 8 wr Yt XY 5 7 RA 40 FIG 10 RELAY CIRCUIT BOARD 10KaY 258200 oopF bov ApS ss 24vER R 204B 002 4 REC Relay CH 2 VR 50ka B...

Page 62: ...c 2 a 330a 56Kn 0 0 pF RA 40 FIG 9 BIAS OSCILLATOR CIRCUIT BOARD 309 2L 830n 2L ye 5 6Ka 0 0 MF 0 04 ur OSC TRANS...

Page 63: ...N Qi gg Rei Sehed 3 6 8 wD oN ON La nr b Be COMSLIO AN r 4 Ss joka Aw WY p piss N S i d 9 Ss 28A49 looka 3 9ka fi NS 00ka Sope asv 0Kn2 Ro RA 40 FIG 8 ee SN a ZS as 3 9 ka EO Boaeen x ae eae fr 2 28 a...

Page 64: ...VR OmH S0kKa B 300pF R 204 8 258 200 ene J00pF 50V OKLA 2b RE 3 e fi a t y hi Je o 0 0 FY UB _ CH Rela 4 s x xX XRa N Dy f o e 6 Be Oe 8 8 s 8 Sx F F 8 ess 8s Eo 6 4 RA 40 FIG 10 RELAY CIRCUI T BOARD...

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Teac A-4000, Service Manual

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