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Teac A-7300RX, Service Manual, Page: 63 / 65

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Teac A-7300RX Service Manual Download Page 63

Summary of Contents for A-7300RX

Page 1: ...2 track MASTER RECORDER A7300RX Stereo Tape Deck with dbx System edits TEAC CORPORATION 51031760 20 Poares oS...

Page 2: ...be applied to the A 7300 also dbx noise reduction system made under license from dbx Incorporated The word dbx and the dbx symbol are trademarks of dbx Incorporated NOTE 1 When placing an order for p...

Page 3: ...NAB 50 y sec 3180 sec Three Erase Record and Playback dbx System type 1 One direct Drive DC Servo Capstan Motor Two Eddy Current Induction Reel Motors 100 kHz 5 kHz Push Pull oscillator 100 117 220 24...

Page 4: ...minimum of the following tools and test instruments are required for measuring and adjusting to obtain optimum performance Regular maintenance tools will be adequate for those not listed here If any...

Page 5: ...REMOVING TAPE TRANSPORT CASE AMPLIFIER CASE AND CASE LEGS TAPE TRANSPORT AMPLIFIER See illustration for complete dis assembly instructions Fig 4 1 Removing Tape transport and Case legs Fig 4 2 Removi...

Page 6: ...ssembly After the head is replaced be sure to replace the shield case and tighten the 2 counter sunk screws on the rear of the head assembly plate Also insure that the spring D on the head housing is...

Page 7: ...ews in Tension Arm Ring C _ Lift off these parts Tension Arm Ring C and Tension Arm D Dunk wn Fig 4 5 Right Tension Arm and Drive Roller ass y Removal 4 5 REMOVAL OF TENSION ARM LEFT 1 Do steps 1 and...

Page 8: ...Watch for the washers T 559 Fig 4 7 Pinch Roller ass y Removal 4 7 REMOVAL OF CAPSTAN MOTOR ASS Y 1 Do steps 1 and 2 of Section 4 4 2 Dis connect Multi 11P Socket B 3 Remove 3 mounting screws on Moto...

Page 9: ...4 Voltage Selector and Frequency SW Reel Motor Right Reel Motor Left C155 Reel Motor pee Stablilizer Unit B Solenoid Power Unit Drive Unit Stabilizer Unit Capstan Motor ass y Impedance Roller Drive R...

Page 10: ...n shaft 2 drops Remove the dust cap for access to the oil pit NOTE Neither the reel motors which utilize oilless metal bearings nor the direct drive DC capstan motor require oiling Therefore no oiling...

Page 11: ...e playing back the Test Tape Coarse Adjustment Without Tape TPs start es By Height and tilt screws This alignment is performed by viewing from the side without tape threaded Check that the head surfac...

Page 12: ...in the cut out window of the plug 4 Only the voltages indicated on the selector plug socket can be selected with the selector plug If you desire to use your deck connected to a voltage that is not ind...

Page 13: ...peed Adjustments Lock Nut 14 8 6 WOW AND FLUTTER CHECK NOTE Before performing this measurement clean the head and Tape run guides also check pinch roller pressure etc Use new Test Tape if possible for...

Page 14: ...As brake torque will change with cleaning brake drums and brake shoes should be cleaned only when absolutely neces sary If cleaning is required use TEAC cleaner TZ 261B After cleaning operate the brak...

Page 15: ...reel to slowly draw the scale toward the hub 4 Hold the spring scale with enough force to allow a steady reading 5 The torque reading should be approx REEL SW TAKE UP LARGE 530 to 570 g cm 7 4 to 8 0...

Page 16: ...am 808 10k 1 10 20 PHONE a 24dB 81 30 40 at ape OUTPUT control is positioned at specified 50 output Level 2 Each level given in the diagram shows values 60 55 HEAD during playback with YTT 1004 400 Hz...

Page 17: ...Rec Mono L or R VR 814 814 Encoder Level VR 624 624 Decoder Level Fig 10 1 Ampli PC Board Location and Adjustment Points 10 2 ADJUSTMENT SEQUENCE CHART PLAYBACK HEAD PREPARATION AZIMUTELADI PLAYBACK P...

Page 18: ...at heads have been properly mounted as to height tilt and tangency review Fig 10 5 Head Alignment Fine Adjustment Setup and page 12 test connections PLAYBACK FINE ADJUSTMENT Tape SPEED SW LOW 7 1 2 ip...

Page 19: ...re oe sponse limits given in Fig 10 7 If adjustment is required adjust VR 203 204 on PLAY EQ AMPL UNIT for HIGH speed Change Tape SPEED SW to LOW 7 1 2 ips position Thread a Test Tape YTT 1003 on the...

Page 20: ...TPUT controls are at the Specified setting Do not move these controls unless instructed in this procedure to do so The accuracy of many of the following adjustments and readings depends on these contr...

Page 21: ...r less 10 16 RECORD HEAD AZIMUTH ADJ Tape SPEED SW LOW 7 1 2 ips FINE ADJUSTMENT NOTE The effect of turning the azimuth screw will not immediately register on the VTVM A slight delay will be noticed T...

Page 22: ...signals feeding into the Test equipment should be filtered out by using an external Bias Trap RECORD BIAS and EQ SW at position 1 Tape SPEEDSW HIGH 15 ips 19 Apply signal swept from 30 Hz to 28 kHz 8...

Page 23: ...se OVERALL 2 24 RECORD BIAS and EQ SW at position 3 Tape SPEEDSW HIGH 15 ips 28 Apply signal swept from 30 Hz to 24 kHz 28 dB 30 8 mV and record on a blank TEAC YTT 8023 29 During recording monitor th...

Page 24: ...UT on Right channel with VTVM connected through a 1 kHz band pass filter Level shall be 45 dB or less Repeat the above procedure using a 125 Hz signal and by passing the 1 kHz band pass filter Depress...

Page 25: ...sed in this Test must be 1 M ohm or more 26 10 27 ENCODER OPERATION CHECK With controls set as described above in Section 10 25 10 26 step 1 and set ENCODER SW to IN 1 Change the Input frequency to 10...

Page 26: ...19 2 Check also for reading within the Response Limits chart See Fig 10 20 for Input Level FS 1 2 RESPONSE IN 6B et ET Low 7 4 RESPONSE IN 48 K FREQUENCY IN Hz Fig 10 20 dbx Single Sinewave Response L...

Page 27: ...IT J121 Pin 3 Defective Q121 or Q122 High Level output voltage not present on the CONTROL UNIT P41 Pin 1 Defective CONTROL UNIT Fast Forward OK Defective Q71 or Ki2 High Level output voltage not prese...

Page 28: ...on P151 at Pins 10 or 11 Defective Q601 Q602 Q603 on AMPL STABILIZER UNIT Defective Q207 Q208 Q209 on PLAY EQ AMPL UNIT or associated parts SOURCE also inoperative Defective Q301 on METER PHONE AMPL...

Page 29: ...ERT TURMAHYVINWOHOO oo a wo WOH DOA HND UBREwE OA Nanya CoOwo we aw SERSASESs TENSION TORQUE CONVERSION FORMULA Aan GAornrsna Grams Cm to Oz In Grams x 0 014 Oz In Oz In to Grams Cm Oz 0 014 Grans Cm...

Page 30: ...RESISTORS 22 31 ASSEMBLING HARDWARE CODING LIST 32 Effective OCTOBER 1976 194 PARTS ORDERING INFORMATION Spare parts are available through your nearest TEAC Autho rized Service Center or directly fro...

Page 31: ...1 EXPLODED VIEWS AND PARTS LIST SECTION EXPLODED VIEW 1 AUSTRALIA ONLY L...

Page 32: ...XPORT 51240140 Socket AC Power 3P AUSTRALIA 1 17 50541150 Capacitor Polyst 0 0047 mfd 250V 1 18 55546720 Holder Cord 1 19 50279490 Clamp B 1 20 50435070 Jack Pin 2P 1 21 55540990 Plate Connector Mount...

Page 33: ...2 EXPLODED VIEW 4 P M2x6 t4 swee 4 P Maxd sw2 4 SC M3x4...

Page 34: ...ate 2 23 55240840 Spring Head E 2 24 55341990 Plate Head P 2 25 55507180 Head Shield 2 26 50664520 Head Record 2T 2CH 2 27 50664530 Head Playback 2T 2CH 2 28 50435040 Socket 9P w Clamp 2 29 55546740 S...

Page 35: ...EXPLODED VIEW 3 3 BSA M4x10 2 BSA M3x6 7 a RSE I 0 4...

Page 36: ...ex 3 30 55405020 Stud A 3 31 55405030 Stud B 3 32 55202100 Spring Cue Return 3 33 55507190 Journal Cue Link 3 34 55507220 Link Cue 3 35 55305150 Lever Cue 3 36 51330010 Switch Rotary Toggle 3 37 51330...

Page 37: ...EXPLODED VIEW 4 3 2 BSA M3x 6 2 BSA M4xi0 4 BSAM4xi0...

Page 38: ...or Reel Transformer Power Cap MP 7 1 5 mfd x 2 250V Resistor Wire Wound 100 ohm 30H Resistor Wire Wound 30 ohm 30H Plate Resistor Resistor Wire Wound 600 ohm 30 H Chassis Ree Motor Standoff Reel Motor...

Page 39: ...Ot BSF M3xI0 S MA3IA G3001dX3...

Page 40: ...oard Assy ENCODER UNIT 5 20 51683550 PC Board Assy DECODER UNIT 5 21 55042791 Side Chassis Assy Ampl Right 5 22 55540990 Plate Connector Mounting 5 23 50438411 Connector Socket 12P 5 24 50436631 Conne...

Page 41: ...EXPLODED VIEW 6 g 8 BSB M3x 5 2 BSA M3x6 12...

Page 42: ...er VU PC Board Assy BIAS OSC UNIT PC Board Assy RECORD AMPL UNIT B PC Board Assy AMPL STABILIZER UNIT PC Board Assy RECORD LINE AMPL UNIT C PC Board Assy METER PHONE AMPL UNIT C PC Board Assy PLAYBACK...

Page 43: ...He He e252 100k r 262 334 R258 Sk ai a re a R256 56 e dices Tariov cose 1 chose Arion Ty 41 90V 7 9 Ae x 560 i R267 antl gePOT3 AT RB ie wags TP Gn C267 Boog 10 50 10 50V b 33 16V 33 16V eo ay R276 4...

Page 44: ...5 100 R406 100 raze 860 sox an Q402 2SCl222 E R402 820k RgonB20 Q40 2scl222ie C405 IOP C403 0 001 cits sites gfies 2 1 fon Sa 0404 2SA750IE ee R411 820 0403 2SAT50O E Be Me site Ea OB R408 5 6k 2 R407...

Page 45: ...8M Q452 2SC1222 E f 0451 2SCi222 E B C E me eo C454 22P deo Peas C453 22P she T 50V Tarov peike R459 1 8k C456 330P R457 12k C455 330P pearls fea R462 27k a R461 27k B C E E C 8 Q454 2SA750 E 453 2SA...

Page 46: ...56k He fe he 47 25V 47 25V 47 25V 47 25 AM Raia 33k Reis 33k AWA Rae 12k Reis 12k NN Cara 22P Rees 1 2k R223 Re2e 1BO 5 Reet g0 Q206 7 a Bc Ce o 2gciooolBL S 48 2gciooo iOk 0 015 Qezoe 25C1317 R 8 REC...

Page 47: ...scoameuemeecta ite 7 oe bs i 000 428 Z9BY en rn 42 Ne obey ec ta elves Sled ee Seal _ d0zz eta deo 8180 A 068 Qcey ele AG2 EE peed a yAsere a on ENCODER UNIT Bove pA Bl BA 9 10 DECODER UNIT 18...

Page 48: ...11 SOLENOID DRIVE UNIT C B Q127 _ 2scizigis 12 REEL MOTOR DRIVE UNIT Ql23 2gc13 8 s a P 214 19...

Page 49: ...13 CONTROL UNIT RST 100 R58 229 51671471 1c4a SN7410 a c43 edhe HH 0 0 O01 Sennnceind SO Wensesannsi Mirena CONTROL UNIT ce 6800 16V 51672470 cg 2200 50V oe 014 ER2 06 DIS oe DIS gi8208 DIT 20...

Page 50: ...S Q26 2S8C82a S Rae 15k o O m VRa 500 B 24Vv oRITI 33 26 DITI SIBOI 04 1S2473x2 RIT 100 o _ RIT3 10k aire 2sAag RIT5 470 Wr RIT6 10k so 10 25V DZazWz 0909 he sy eco 929 280288 K MB5I3A R C23 100 25V...

Page 51: ...17 REWIND STOP UNIT Cies 0 01 50V Clea be elke Res 10K0 033 50V 18 MIC TRANSFORMER P 128 19 TRIMMER RESISTORS 22 P 126 180k 710 fhe 0 001 sov B C E 708 Q7O2 ele esci222 e P 211...

Page 52: ...fd 47 mfd 47 mfd 33 pfd 10 mfd 220 pfd 0 01 mfd 33 mfd 10 mfd 1 mfd VARIABLE RESISTORS 50534210 cOILS 50566640 Semi fixed 5k ohm B Choke 220 uhy 50V 50V 10V 10V 50V 50V 50V 50V 16V 50V 50V Parts List...

Page 53: ...ylar 0 001 mfd 50V VR551 VR552 50534210 Semi fixed Res 10k ohm B C405 C406 50547400 Dip Mica 10 pfd 50V C407 C408 50547460 Dip Mica 330 pfd 50V COILS C409 C410 50554540 Elec 1 mfd 35V C411 C412 517008...

Page 54: ...m 47k ohm 3 3k ohm 2 7k ohm 47 ohm 560 ohm 56k ohm 2 2k ohm REF NO PARTS NO DESCRIPTION CAPACITORS C301 C302 50554540 Elec 1 mfd C303 C304 50547360 Dip Mica 300 pfd C305 C306 50547440 Dip Mica 100 pfd...

Page 55: ...R C 221 C222 50554040 Elec 10 mfd 25V C519 C520 50543120 Polyst 820 pfd 250V C 223 C224 50554490 Elec 47 mid 25V C 521 C522 50548960 Mylar 0 0015 mfd 50V 5 C225 50546622 Elec 6 8 mfd 25V C523 50554900...

Page 56: ...7k ohm 10k ohm 27k ohm 2 Metal Film 3 0k ohm 2 Metal Film 22k ohm 220 ohm 3 3k ohm 390 ohm 6 8k ohm 10k ohm 2 Metal Film 270k ohm 2 2M ohm 1k ohm 20k ohm 2 Metai Film 4 7 ohm 3 3M ohm 3 9k ohm 2 Metal...

Page 57: ...20 1k ohm R635 51813760 82 ohm 2 Metal Film VARIABLE RESISTORS R636 51813380 220k ohm R637 51812480 39 ohm VR621 VR623 50539270 Semi fixed 47k ohm B R638 51813060 10k ohm VR622 50539230 Semi fixed 10k...

Page 58: ...N7402N 50427140 SN7410N 50427270 N74122N 0427250 SN7404N 50427120 SN7400N TRANSISTORS 50424670 2S8C1317 R REF NO D41 D42 D44 R41 R45 R46 R47 R50 R51 R52 R57 R58 R60 R59 R61 R62 R63 R64 R65 C41 C42 C47...

Page 59: ...eet 50V 35V 25V 10V 16 STABILIZER UNIT B REF NO Q171 Q172 Q175 Q173 Q174 Q176 Q177 Q178 D171 D172 D173 D174 D175 D176 D177 D181 ZD171 2D172 PARTS NO DESCRIPTION 51682311 PC Board Assy B 51672310 PC Bo...

Page 60: ...1670840 PC Board R361 R368 50572680 Carbon 270 ohm 1 4W 5 R369 R370 50572600 Carbon 120 ohm 1 4W 5 R371 R378 50572680 Carbon 270 ohm 1 4W 5 R379 R380 50572600 Carbon 120 ohm 1 4W 5 T361 T364 51520972...

Page 61: ...pping Screw A uD TA Round Head RTB Tapping Screw B Type re Oval Countersunk Hex Socket Head Screw Setscrew Cup Point Round Head Slotted Socket Wood Screw Setscrew Flat Point Flat Countersunk E Ring Wo...

Page 62: ...SCHEMATICS a TAC...

Page 63: ...TIMER CONTROL SCHEMATIC RC 350 oo TO TAPE DECK 51680420 REMOTE CONTROL SCHEMATIC RC 170 PAUSE LAMP 073...

Page 64: ...V LR oF One 0509 0403 0404 lasciz22ie L 6 28A721 T Q407 2SA750 E S7l2b Q451 0452 Q453 0454 ascizezie _ __2SA7S0lE _ ales L ar TUNE mic LINE MIC oe et SE eS fe 9 rc AMPL STABILZER UNIT t Q60 2SC1384 Q...

Page 65: ...4 In GaN oo gai esciseate 23 2spse6iR ai ed opal 022 280288 K a23 a28 2ScB28lS t RaKE SOL Me ITV BRN FUSED yysist ay e pep tm O GRY DIS4 VOGE DISS VO6E A ai51 nN Tay 2sa49oty C22 330 35V Swis4 3 RI r...

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