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Teac A-400, Service Manual, Page: 48 / 56

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Teac A-400 Service Manual Download Page 48

Summary of Contents for A-400

Page 1: ......

Page 2: ...7 Reel Table Replacement 7 4 2 1 Record Playback Head Azimuth 2 7A Take up Reel Table 04 7 SMIUSIGIG 9 02 2 g0 ah eh series sepens 15 278 Supply Reel Table j 4 2 2 Specified Output Level Setting es 1...

Page 3: ...istortion 4 4 track 2 channet Record Play back Head DC Servo Motor with F G voltage control 100 kHz Horizontal 100 117 220 240 V AC 50 60 Hz General Export Models 117 V AC 60 Hz USA Canada Models 220...

Page 4: ...on its top surface as illustrated in Fig 1 2 Remove the 7 screws from the bottom 3 Remove the Main Chassis from the Cabinet Pe NS af 7 P M3xl2 7 W 3 216 1 6t Fig 1 Cabinet Removal Fig 2 Front Panel R...

Page 5: ...Cabinet and the Front Panel See Section 2 1 2 2 2 Remove the 4 screws 1 4 3 Extract the Insulator Plate A 5 from the Main Chassis 6 4 Remove the Reinforcing Angle 7 by taking off the 2 screws and loos...

Page 6: ...e head terminal pins should be done quickly to prevent breaking of internal wires of the head due to overheating PINCH ROLLER REPLACEMENT Remove the Cabinet and the Front Panel See Section 2 1 2 2 Qpe...

Page 7: ...EPLACEMENT After removing the Tape Transport Chassis from the Main Chassis do the following procedures See Section 2 1 2 2 2 4 Remove the Capstan Belt 1 from the Motor Pulley Remove the PC Board part...

Page 8: ...p of a light machine oil with an oil applicator to the shaft of the Flywheel and spread oil evenly over the shaft with a flannel cloth After installing the Flywheel be sure to clean the tape moving po...

Page 9: ...ivalent 8 Frequency counter Digital type capable of 10 Hz to 100 kHz indica tion NOTE All the mechanical checks and adjustments should be done with the Cabinet and the Front Panel removed See Section...

Page 10: ...ble Assy See Section 2 7 3 3 FAST FORWARD TORQUE MEASUREMENT The fast forward torque should be 80 g cm 1 1 oz inch or more 1 Repeat step 1 to 3 in 3 2 above 2 Set the Cassette Reel Adapter 22 mm Dia c...

Page 11: ...the Pinch Roller and the Heads with TEAC 12 261 Cleaner Kit or with pure alcohol as appro priate As the measured results will vary with respect to location on tape at which it was taken three points a...

Page 12: ...e the Muting Switch PC Board to the right toward the arrow as far as possible by hand and retighten the 2 screws 5 After adjusting secure the 2 screws with a drop of locking paint Right Rotary Lever P...

Page 13: ...pedance for Dolby Test Point is 1 M ohms or more 6 While performing all electrical alignments the INPUT switch should be placed in the LINE position unless otherwise indicated 7 All checks and adjustm...

Page 14: ...low to each input jack 11 Check for the specified value of 580 mV 2 5 dB at the Dolby test points using the VTVM INPUT Switch Position Input Jacks Minimum Input Level 19 dB 3 dB 61 5 mV 122 mV 67 dB 3...

Page 15: ...load resistor The value should be 21 dB 2 dB 54 8 mV 86 mV 400Ht ATTENUATOR RECORD contro Specified Seting DECK under TEST PAUSE mode Fig 30 Test Condition for Headphone Output Level Checks IMPORTANT...

Page 16: ...If the response does not meet specified response limits the head should be checked for accumulated oxide or dirt Then if no dirt is found the head azimuth should be readjusted 4 2 5 Signal to Noise Ra...

Page 17: ...deck 2 Connect a VTVM to the OUTPUT jacks bacilkaren 3 Connect an AF oscillator to the LINE IN jacks through an attenuator 4 Place the BIAS EQ switches to the 1 positions i aa 5 Place the deck in the...

Page 18: ...6 Place the deck in the record mode for regular tape 7 Rewind and play this recorded section of the tape 8 Read the indicated value on the distortion analyzer Test tape To 9 The distortion factor shou...

Page 19: ...be used The test signal delivered from the AF oscillator should be tuned to the filter used 1 SEO SY ee ey Connect an AF oscillator to the LINE IN jacks through an attenuator Connect a VTVM to the OU...

Page 20: ...m 10 9 mV maximum ONE 2 4 3 11 Dolhy NR System Efficiency Checks The variation at 1 kHz should be 5 5 dB 2 5 dB The variation at 10 kHz should be 10 dB 2 dB 1 Connect an AF oscillator to the LINE IN j...

Page 21: ...OLBY TP R ch DOLBY TR L ch vrio2 TR eS Noon sao MS BIAS TRAP TR BIAS TRAP T R Fig 50 Adjustment Location A R ch L ch Fig 51 Adjustment and T P Location B VR101 VR201 Output level L102 L202 MPX filter...

Page 22: ...g BAe licen playback with MTT 150 Test Tape Dolby tone e VR101 Output level adjustment Recording Section 10 5 vR402 es 2 rode 0 zs V 580mv a 8dB 10 4 8 Negus _ 3 548 9 aisas 9 VRIO4 ec _s METER 20 FEz...

Page 23: ...wires Poor soldering of head terminations Defective Head Sound can be heard during recording Defective Switch 101 Defective Transistor 0103 0104 Defective Parts associated with parts indicated above D...

Page 24: ......

Page 25: ...written on the back cover When ordering parts always include the following information 1 MODEL 4 DESCRIPTION 2 REF NO 5 UNIT SERIAL NO 3 PARTS NO 6 MANUAL CODE NO NOTICE REGARDING PARTS ORDERS 1 Do n...

Page 26: ...Head Tapping Screw A Type Round Head Tapping Screw B Type Stove Head Screw Truss lf MACHINE SCREW Binding Head Screw j Hex Socket Setscrew Flat Point Flat Countersunk Head Screw 4 Hex Socket Oval Coun...

Page 27: ...55202651 55041750 55041760 55544290 55330120 55442000 55010091 7 W 3 2 xI6 x16t 7 P M3xl2 E 179 NOTE Parts marked with require longer delivery time than regular parts DESCRIPTION Sash Side Right Cove...

Page 28: ...2 TRANSPORT SECTION A O 8 2 a eT 4x8 oe ee S 5 1907 A CES Ke 49 47 L axe 4g 4 2 PSA M26x4...

Page 29: ...Latch 2 27 55202360 Spring Lock Lever 2 28 55040970 Lever Assy Pause A 2 29 55040980 Lever Assy Pause B 2 30 55543880 Lever Eject Control 2 31 55040901 Guide Plate Assy Cassette A 2 32 55042190 Counte...

Page 30: ...TRANSPORT SECTION B 3 ei3 BM2 6x6 4 PM2xl0 2 PSA M2 W264 21 22 18...

Page 31: ...nsulator Plate B 3 21 55543921 Plate Micro Switch B 3 22 55544470 Plate Micro Switch 3 23 55041820 Cam Assy Rotary Lever 3 24 5042040 Lever Assy Record Actuator B 3 25 55042030 Lever Assy Record Actua...

Page 32: ...4 MAIN CHASSIS 2 TAPTITE M3x8 2 TAPTITE M3x8 2 TAPTITE M3x8 BIAPTITE Maxe EUROPE ONLY eA APTIT N WO TAPTITE M3x8 r4 2 M3x8 t82 EUROPE ONLY...

Page 33: ...or EX 4 17 51310320 SW Slide 4 18 51310330 SW Slide 4 19 55341180 Push Rivet 4 20 50451330 Terminal Assy 4 21 50332580 Clamp Wire E 4 22 55544250 Clamp Wire G 4 23 51681920 PC Board Assy LED C 5143047...

Page 34: ...10 FOIL SIDE PC BOARD SECTION Diagram 1 RECORD PLAYBACK AMPLIFIER See...

Page 35: ...13470 51013480 51013490 51013450 INCLUDED ACCESSORIES DESCRIPTION Cords Input output Connection 2 used Cleaning Stick TZ 275 Silicone Cloth Fuse 0 54 A 400 Owner s Manual A 400 Owner s Manual A 400 Ow...

Page 36: ...202 50425170 Silicon 1S2473VE R156 R256 50570860 1 5kQ D103 D203 50425170 Silicon 182473VE R157 R257 50570560 822 D104 D204 50425170 Silicon 1S82473VE R158 R258 50571140 22kQ2 R159 R259 50571200 39kQ...

Page 37: ...uF 5O0V 5 51681972 PC Bd Assy EUROPE 132 C232 50554050 Elec 10uF 16V 133 C233 50548040 Mylar 0 1F 5OV 10 51671911 PC Board only C134 C234 51703000 Dip Tant 0 33uF 35V 10 C135 C235 50554540 Elec IMF 50...

Page 38: ...50570820 Carbon 1kQ 8 1 4W 5 R326 50570640 Carbon 1802 1 4W 5 R327 50570580 Carbon 1002 1 4W 5 R328 50517860 Carbon 2 2kQ2 1 2W 5 R329 50571540 Carbon IMQ 1 4W 5 CAPACITORS C301 50546709 Dip Tant 14F...

Page 39: ...6 Lae fg 2 ov 2 3 18 e 8 as Pe ee 3k8n 38 g alg ax 28 ats ahg ae ai 2 ols al 0 clo ais S oTS OTS Riot x ek ng Ras ek 5 8 3 3 els 2 7k ay T T 3 88 ze 2 E LJ acgasorp_ R22 2 sa 680 i Ormnd 2 Own onl 1 S...

Page 40: ...VI0 0 015 50V 5 cxs7 4 NOTES 1 Schematic diagram shown in the LEFT channel 2 Schematic diagram shown in the STOP mode 3 All resistors values in ohms 1 4 watt k 1 000 ohms 4 All capacitors values in mi...

Page 41: ...leaning 00 20000 8 Maintenance Demagnetizing 2 10 Service Note and Troubie shooting Chart 12 Bias and Equalization 2 0 00 e eee 14 51014130 Table des mati res Introduction et consid rations g n rales...

Page 42: ...Vermeiden Sie Temperaturen unter 5 C Platze mit hoher Feuchtigkeit Die Lebensdauer des Gerates wird wegen Korrosion und mdglichen Pilzbewuchses der gedruckten Schaltungen verkurzt Staubige Platze Inr...

Page 43: ...ced on the drive motor Avoid temperatures lower than 5 C 40 F High Humidity Locations Will shorten equipment life from corrosion and possible fungus growth on printed circuit boards Dusty Environments...

Page 44: ...der AuRerdem miissen Andruckrolie und Tonwelle sehr sauber gehalten werden um einen einwandfreien Betrieb zu gewahrleisten Siehe O Les bandes des cassettes sont enroul es sur des bobines incorpor es d...

Page 45: ...a rretes en una conviente caja especial que se inserta facil mente en el cassette deck El ancho de la cinta la forma y tamafio del cassette y la velocidad de la cinta estan estan darizadas para brinda...

Page 46: ...pfen herausgebrochen wurde mittels Schraubenzieher gema Abbildung und das Kassettenband spater nochmals be spielt werden mdchte kann das Zapfenloch mit einem Klebband tiberklebt werden um ein Aufnehme...

Page 47: ...ter the re cordist decides to re record the cassette a piece of tape can be placed over the tab hole to allow recording Fig F G Manejo de la Cinta No se deber dejar la cinta en tos siguientes lugares...

Page 48: ...einigungsfliissigkeit Flissigkeit B im Satz die sich besonders zum Reinigen der Andruckrolle eignet Fig T tes Apr s avoir utilis la platine pendant un long moment oxyde provenant du rev tement de la b...

Page 49: ...at is es pecially effective in cleaning the pinch roller _Mantenimiento Limpieza_ Fig K Cabezas Despu s de usarse el deck por largo tiempo el oxido y otras substancias ajenas tienden a acumularse en l...

Page 50: ...e War tel que le TEAC E 3 vous est recommand Les t tes tungsarbeit empfehlenswert d effacement et d enregistrement reproduction de m me L sch und Aufnahme Wiedergabekopf und samtliche que toutes les p...

Page 51: ...3 Turn on the head eraser demagnetizer and bring the tip of it close to the heads Move the tip up and down across all the heads and other parts in the tape path 4 Slowly withdraw the eraser about 12...

Page 52: ...DERGABE REPRODUCTION Nochmals s mtliche AnschlUsse Uber prufen Eingangspegel zum Verstarker erhohen Pegelregler und Schalterstellungen am Verstarker Uberprufen d attente PAUSE Essayez de r enrouler ou...

Page 53: ...e output level Check level controls and switch settings Verificar la conexion del cable de energia Liberar la tecla o el boton Pausa PAUSE Accionar Rewind Reen rollado o FF Avance Rapido para corregir...

Page 54: ...erwendet werden Ideal ware die Wahl einer Spezialbandmarke in jeder der drei Klassen und Einstellung der Vormagnetisie rungsschaltung des Kassettendecks auf den fiir jedes Band erforderlichen genauen...

Page 55: ...ch of the three categories and have the bias circuitry of this deck adjusted for the exact level of bias each tape requires Equalization Equalization is special circuitry that is designed and built in...

Page 56: ...pe Deck Tape Deck de Cassette Estereof nico TEAC CO RPO RATIO N 3 7 3 NAKA CHO MUSASHINO TOKYO PHONE 0422 53 1111 TEAC CORPORATION OF AMERICA 7733 TELEGRAPH ROAD MONTEBELLO CALIFORNIA 90640 PHONE 21 3...

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