Teac MT-20D-IO Maintenance Manual Download

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Summary of Contents for MT-20D-IO

Page 1: ...TEAC MT 2ST 20D IO STREAMING CASSETTE MAGNETIC TAPE UNIT MAINTENANCE MANUAL...

Page 2: ...TEAC MT 2ST 20D IO STREAMING CASSETTE MAGNETIC TAPE UNIT INTENANCE MANUAL TEAC CORPORATION fiN 10 1 03 4 0 REV A...

Page 3: ...AS Interface control PCBA Interface Control 3 4 1 CPU 3 4 2 3 4 3 3 4 4 3 4 5 3 4 6 3 4 7 3 4 8 ROM RAM Host interface control DMAC Counter timer Write read control I O port 301 301 304 311 311 315 31...

Page 4: ...lization of SOA Initialization of SOB Initialization of SOD 4019 4021 4023 4 2 8 Initialization of SOE 4025 4 3 Check and adjustment procedures 4027 4 3 1 Positional adjustment of reel motor F R Ass y...

Page 5: ...ncoder roller Replacement of solenoid Ass y Replacement of head base Ass y Replacement of PCBA Drive Control Replacement of PCBA Interface Control Replacement of front bezel Replacement of ej ect butt...

Page 6: ...309 310 310 310 313 Example of operational waveforms of read circuit 314 Write circuit and erase circuit block diagram 315 Servo circuit block diagram 317 Other control circuits block diagram 319 Int...

Page 7: ...at TP3 Example of waveform at TP4 Example of waveform at TP5 Example of waveform at TP6 Example of waveform at TP9 Example of waveform at TP1 Example of waveform at TP2 Example of waveform at TP3 Exm...

Page 8: ...4031 Bonding of encoder roller 4031 Check of rotary direction of reel motor 4033 Mounting of FPT J l g 4035 Check of file protect sensor 4035 Loading of mirror cassette 4040 Tape movement check tape...

Page 9: ...4098 4099 4099 4102 4103 4104 4109 4109 4110 4114 4115 Fig 454 Replacement of eject Button Fig 501 Fig 502 Fig 503 Fig 504 External view 1 External view 2 External view 3 External view 4 502 503 504 5...

Page 10: ...presented by the following symbols 90 ips 30 ips Permalloy head Ferrite head D CAS SCSI BASIC Applied only to the models in which the tape speed is 90 ips inch per second during data write read opera...

Page 11: ...90 ips Ferrite head MT 2ST 20S 13 19305060 13 30 ips MT 2ST 20S 20 19305060 20 90 ips Permalloy head MT 2ST 20S 21 19305060 21 30 ips SCSI MT 2ST 20S 22 19305060 22 90 ips Ferrite head MT 2ST 20S 23 1...

Page 12: ...SECTION 3 THEORY OF OPERATION 300...

Page 13: ...R I TR 0 y DSO TSI I I I I I I I I I I I I I I I I WRITEIREAD 1 CONTROL _f_t_ l TS O _ _t_ _ __i 1 0 PORTS 1 CONTROL a SERVO GO fWD HIS lOK I I I I I I I I I I I I L ________J il II R fPT ACK ClD COUN...

Page 14: ...WRITE I I ERASE HEAD I I I I fJ ENCOOE i I Dp I LEO OT EOT T I I I CAS E LOAD I FI PRnTFC I MOTOR REV I MOTOR fWD I I 12 1 OV I L t J POWER b SCSI Fig 301 Overall Block Diagram iPCBA iNTERFAcECoNrRoL...

Page 15: ...EAD WRITE a ERASE TR 0 2 RMODE I I I I I I j r lSENSOR I CONTROL a SERVO MOTOR REV BOT EOT HOLE SOLENOID i ENCODER I Lq ________C Cl LEO BOTIEOT I T CASSETTE LOAD I fiLE PROTECT MOTOR REV I MOTOR FWD...

Page 16: ...center It consists of a loading base C Ass y loading base M Ass y lever base Ass y and loading arm Ass y etc centering around the chassis The loading unloading operation of the cassette tape is perfo...

Page 17: ...assette tape gets out up to halfway from the front bezel and then the MTU is placed in the cassette unloading status Fig 302 303 c Cassette tape face identifier mechanism If the cassette tape is inser...

Page 18: ...Cassette tape loading unloading mechanism Loading base C Ass y Cam lever Loading arm Cassette tape Eject button Reel motor Ass y J I I I I c Cassette loading W U status III III t L Unloading status F...

Page 19: ...o Asymmetrical slot Stopper Chassis Selector a With face B inserted Fig 304 Cassette tape face identifier mechanism 307...

Page 20: ...to it so that the tape speed is kept always constant 4 Various detection mechanisms a Cassette loading detection mechanism This mechanism consists of a photo interrupter and a loading arm M to detect...

Page 21: ...BOT EOT holes markers of cassette tape LED built in the LED hole sensor Ass y and photo transistor in the sensor guide Ass I y detect the holes markers provided at both ends of magnetic tape Fig 308 D...

Page 22: ...e tape loading detection mechanism Write inhibit hole File protector Photo interrupter Interrupter C ASs y Fig 307 Write inhibit hole detection mechanism Photo transistor Sensor guide ASs y LED hole s...

Page 23: ...lied to the AGC amplifier The AGC amplifier adjusts automatically its own gain so that the sensitivity difference of the magnetic tape used is corrected and the read level is kept nearly constant The...

Page 24: ...of the threshold detector is reduced due to drop out etc the trigger pulse signal to the retriggerable monostable multivibrator is interrupted and the output signal of the retriggerable monostable mul...

Page 25: ..._______ J r J TRACK SELECT r o l TR 113 ATT PRE AMP f VC t U5 f TR 1 3 BIAS 6V U7 TRO 2 I I r l U6 AGC f4 1 1 I 1 s 2 l DETECTOR IlL TIME I r 9 9 r f4 1 TP7 I DOMAIN r 1 J t J I FILTER GATE t o o RD...

Page 26: ...on tape Preamplifier output TP3 Differentiator output TP7 Level detect amplifier output TP8 Zero crossing detector output U6 16 RD signal o 0 o o o 0 o o Fig 310 Example of operational waveforms of re...

Page 27: ...E HEAD TR 0 2 21 It lI _ ll J TR 113 ERASE HEAD zf x Fig 311 Write circuit and erase circuit block diagram The write circuit and erase circuit consist of a write head driver write gate erase head driv...

Page 28: ...e erase head driver feeds the erase current to the erase head according to the erase clock signal given from the PCBA Interface Control At this time the erase current is supplied from the erase gate 3...

Page 29: ...Note There is a model in which a fixed resistor is used as R43 Fig 312 Servo circuit block diagram The servo circuit consists of an encoder preamplifier comparator monostable multivibrator F V conver...

Page 30: ...formed to move the tape at a constant speed by the above mentioned signal flow The tape speed is changed over between 90 ips and 30 ips by changing the setting time of the monostable nultivirator The...

Page 31: ...OID I 1 I DRIVER I I I TROI2 TR 1 3 TRO LVS POR ROY ACK HOL FP SOLENOID HEAD SHIFT Fig 313 Other control circuits block diagram There are a select low voltage sens power ON reset ready hole sensor fil...

Page 32: ...e phototransistor for the hole sensor into a pulse signal and outputs it The file protect sensor converts the output signal of the photo interrupter for detecting the write protect hole into a pulse s...

Page 33: ...the data system requiring high speed transfer is controlled by DMAC U7 82C37 DMA controller The data transfer between the individual blocks within MTC as shown in Fig 301 a is performed by DMAC in com...

Page 34: ...ia the input port and feeds them back to the tape motion control While as for the data system the CPU generates a data block by adding a header such as track No and block address to the data received...

Page 35: ...This memory is an ROM of 8 K bytes in which the program is stored to realize the CPU operations mentioned in Item 3 4 1 3 4 3 RAM This memory is a static RAM of 2 K bytes used as a data buffer of 3 b...

Page 36: ...P are a bidirectional bus To prevent the bus competition between the driver IC and HOST side driver there is the timing relation as shown in Fig 314 among this bus DIR and HBOEN DIR HI H80EN HI I I _...

Page 37: ...B S DRIVER V IRECEIVER f HB7 I I CLKO HBP UI7 UI8 HBOEN H 16 HBOEN DIR H 18 DIR HDRQ RDY H 20 DACK ROY XFR HI32 XFR EOP ACK H 21 ACK WR RD Fig 315 Host interface control circuit 325 38 7 2 MHz 15 HDRO...

Page 38: ...gnals ACK H XFR H and RDY H as shown in Fig 316 during read opera tion they have the timing relation with ACK H XFR N and RDY H as shown in Fig 317 ROY HI XFR HI ACK HI Jl f HORQ HI HOACKCL L j r EOP...

Page 39: ...ith HDACK L During read operation the beginning data request of each block to DMAC is set by CPU timing MR L and IOW L are outputted from DMAC and the data is written in the register within this IC In...

Page 40: ...e channel 2 is also operated only for the beginning 4 bytes of each block on the tape in read after write operation Namely the three channels are operated simultaneously only in such a case BLKDET TP...

Page 41: ...0 the output from Pin No 10 generates the write clock TP3 by dividing the frequency of the 3 6 MHz clock and supplies the resultant write clock to the write control logic U14 2309 The coulter 1 receiv...

Page 42: ...converts the resultant code into serial data in phase with the write clock to be outputted to CMT The CRC character generated is outputted in the same format in succession to the end data of one bloc...

Page 43: ...GCR SHIFT DATA MPX f CONVER f REG REG TER Lr CRC GENERATOR READ GCR SHIFT DATA CONVER REG REG TER CRC CHECKER READ CLOCK VFO Fig 319 Write read control lpgic block diagram 331 I CMT SIDE WO WRITE DATA...

Page 44: ...TP5 and TP9 is generated from the serial read data RD Data sample timing TP2 is also generated by dividing the frequency of the read clock The phase difference between these two timings is detected by...

Page 45: ...Vc potential so that it becomes higher against UP R and lower against DWN L and thereby the oscillation frequency of the following stage VCO is controlled The reference timing in read operation appear...

Page 46: ...3 4 8 I O port The I O port consists of 81C55 U6 The CPU controls CMT directly via this I O port and monitors the various status signals outputted from CMT SCSI 334...

Page 47: ...essor while the data system requring high speed transfer is controlled by DMAC U8 82C37 DMA controller The data transfer between the individual blocks within MTC shown in Fig 301 b is performed by DMA...

Page 48: ...the input port and feeds them back to the tape motion control While as for the data system the CPU generates a data block by adding a header such as track No and block address to the data received fr...

Page 49: ...This memory is an ROM of 8 K bytes in which the program is stored to realize the CPU operations mentioned in Item 3 5 1 3 5 3 RAM This memory is a static RAM of 8 K bytes used as a data buffer of 15 b...

Page 50: ...nsfer the CPU sets the READY F F within the 2557 SCSI control hereinafter referred to as 2557 and waits for selection from the HOST When such status that SEL is outputted from the HOST together with t...

Page 51: ...nsfer REQ is outputted one clock after c n is outputted upon receipt of selection The command transfer is performed by handshakeing between REQ and ACK Fig 323 shows this status including the relation...

Page 52: ...ACK Ll IOR U MW Ll CD 2557 UI2 10 12 o P 0 9 U21 II c _ 0 R 13 5V I I ___ 1 I _____J U 52 53 54 HDRO HDACK L EOP L 1TO OMAC 1 2 1_ _ _ 1 6 t HINT TO CPU 36 REO Fl I _______J I _ ________J U EOP L U HI...

Page 53: ...llow ing REQ or HINT from being outputted earlier when the ACK response is late U21 and U22 are logic circuits for such purpose 3 Write data transfer This transfer timing is exactly the same as in the...

Page 54: ...TCLK REO ACK HDRO HDACKILl MR III LJ IOWILl U EOP LJ U 1 HiNT I CD Fig 324 Read data transfer timing 342...

Page 55: ...outputs ACK The handshake timing of REQ and ACK is the same as in Fig 323 0 DMAC transfers the end byte of one block o When the ACK response is very fast REQ is set to FALSE and interrupt request HIN...

Page 56: ...on the channel 2 is also operated only for the beginning 4 bytes of each block on the tape in read after write operation Namely the three channels are operated simultaneously only in such a case BLKDE...

Page 57: ...0 the output from Pin No 10 generates the write clock TP3 by dividing the frequency of the 3 6 MHz clock and supplies the resultant write clock to the write control logic U9 2309 The counter 1 receiv...

Page 58: ...her converts the resultant code into serial data in phase with the write clock to be outputted to CMT The CRC character generated is outputted in the same format in succession to the end of one block...

Page 59: ...R SHIFT DATA MPX r CONVER r REG REG TER r L CRC GENERATOR READ GCR SHIFT DATA CONVER t REG REG TER ICRC CHECKER READ CLOCK VFO Fig 326 Write read control logic block diagram 347 r CMT SIDE WD WRITE DA...

Page 60: ...g TPS is generated from the serial Read Data RD Data sample timing TP2 is also generated by dividing the frequency of the read clock The phase difference between these two timings is detected by the p...

Page 61: ...ted into level output Vc potential so that it becomes higher against UP H and lower against DWN L and thereby the oscillation frequency of the next stage VCO is controlled The reference timing differs...

Page 62: ...3 5 8 I O port The I O port consists of IC 81C55 U4 The CPU controls CMT directly via this I O port and monitors the various status signals outputted from CMT 350...

Page 63: ...ce control PCBA interface control P N 1553207300 applied to issue D onward is a LSI version of the discrete type interface control There is not operational difference between these two types except wi...

Page 64: ...a GO H FWD H HIS HI LOK Ll II II II II I I II II I INITIAL CLOCK I I r CONTROL GEN II I 2 11 i J l I I II I I I II I I I I II I I I I I 1 I I I II I I r 4 II I t I r II L i I 2 TAPE I I POSITION MANA...

Page 65: ...I I I I I t___ J 11 1 I I J CLOCK III I I GEN _ _____I ____ I III I I I III I f r I III I I 2 III _ TAPE POSITION I I MANAGE I I I I f I I I I I ROPCONV I I I I I I I r I I CASSETTE I LOAOOELAY ITACH...

Page 66: ...l control The INITIAL CONTROL CIRCUIT controls the initialization of each part of MTU and subsequent operations due to Power ON with the cassette loaded cassette loading or by a reset signal from the...

Page 67: ...the tape speed changeover HSD signal change The STOP CO ROL part is a circuit to control the tape motion when any of the REV signal HSD signal and GO signal from the BASIC IfF changes The REV signal...

Page 68: ...inhibited by the PRDY signal until the EOT or BOT side clear leader is detected After the EOT or BOT side clear leader is detected and the tape position is initialized each signal of UTHI and LTHI is...

Page 69: ...RD signal of the DRIVE IfF and convert it into pulses RD i RDP 5 Cassette load delay RDP CONVERSION CIRCUIT ClK Fig 333 RDP conversion The CASSETTE LOAD DELAY CIRCUIT is a circuit to assure the reten...

Page 70: ...he resultant signal to the BASIC I F as tach pulses ENC U t TACH PULSE CONVERSION CIRCUIT f TCH Fig 335 Tach pulse conversion 7 Clock generator The CLOCK GENERATOR is a circuit to make the master osci...

Page 71: ...of the test points variable resistors and straps are shown in Fig 336 R41 R43 R44 TP18 oJ TP3 TPI R48 S2 Sl TP22 2 TP19 t 1 R21 Rl7 a PCBA Drive Control GND TP9 R12 TP7 8 G b PCBA Interface Control li...

Page 72: ...GND TP6 TPI so S3 Rl2 c PCBA Interface Control SCSI GND TP6 TPI SO Sl Cd PCBA Interface Control BASIC Fig 336 Positions of test points variable resistors and straps 360...

Page 73: ...he level of the read preamplifier and check the various characteristics of the head Ass y etc Signal level 200 to 600 mVp p Fig 337 Example of waveform at TP1 3 TP4 6 V bias PCBA Drive Control This te...

Page 74: ...P7 is used to check the operation of the read amplifier Signal level 1 5 to 4 Vp p Fig 338 Example of waveform at TP7 7 TP8 output of the level detect amplifier PCBA Drive Control Test point for measu...

Page 75: ...on and approx 330 mV during read operation However each value is that obtained when the write mode and read mode are changed over to each other by turning ON OFF the WEN signal without moving the tape...

Page 76: ...t of low voltage sense PCBA Drive Control The point for measuring the output of the low voltage sense TP14 is used to check the low voltage sense voltage 12 V power voltage When the voltage is changed...

Page 77: ...operation of the servo circuit Since TP20 is the test point used during manufacturing of MTU it is not used for maintenance usually 18 TP21 output of solenoid drive PCBA Drive Control Test point for...

Page 78: ...on PCBA Drive Control etc Non detection During detection of data block of data block TPI 4Jr I U 0 17 ms II 5 76 ms 1 a 90 ips Non detection During detection of data block of data block TPI lJr U 0 5...

Page 79: ...Fig 344 Example of waveform at TP2 22 TP3 write clock PCBA Interface Control Test point for measuring the write control signal TP3 is used to check the write clock frequency TP3 Frequency 1 8 MHz a 9...

Page 80: ...djust the VFO operating point TP4 2 5 V Fig 346 Example of waveform at TP4 24 TP5 read data pulse R PCBA Interface Control Test point for measuring the read data pulse R signal TP5 is used to check th...

Page 81: ...6 is used to check the CPU clock frequency TP6 Frequency 3 07 MHz a 90 ips TP6 Frequency 1 5 MHz b 30 ips Fig 348 Example of waveform at TP6 26 TP9 read data pulse W PCBA Interface Control Test point...

Page 82: ...RD signal J TP9 __ _R_e_ference timing a 90 ips J4 17 RD signal TP9 ference timing b 30 ips 440 ns 1500 ns Fig 349 Example of waveform at TP9 27 GND PCBA Interface Control This point is connected to 0...

Page 83: ...n PCBA Drive Control etc Non detection During detection of data block of data block I TPl r U 0 17 ms II 5 76 ms 1 Non detection of data block a 90 ips During detection of data block TP1 _ U o 51 ms I...

Page 84: ...e of waveform at TP2 30 TP3 write clock PCBA Interface Control Test point for measuring the write clock signal TP3 is used to check the write clock frqeuency TP3 Frequency 1 8 MHz a 90 ips TP3 Frequen...

Page 85: ...ng point TP4 2 5 V Fig 353 Example of waveform at TP4 32 TP5 read data pulse R PCBA Interface Control Test point for measuring the read data pulse R signal TP5 is used to check the operation of the wr...

Page 86: ...rface Control Test point for measuring the CPU clock signal TP6 is used to check the CPU clock frequency TP6 Frequency 3 07 MHz Fig 355 Example of waveform at TP6 34 GND PCBA Interface Control This po...

Page 87: ...cy 3 6 MHz Fig 356 Example of waveform at TPl 36 TP2 CIN PCBA Interface Control Test point for measuring the Cassette In signal TP2 is used to check the cassette in detecting operation J4 14 CLD signa...

Page 88: ...ead data signal transferred from the drive to the PCBA Interface Control 39 TP5 RDP PCBA Interface Control Test point for measuring the read data pulses TPS is used to check the read data pulse width...

Page 89: ...t R41 until the voltage at TP13 becomes the specified value when the hole sensor test tape is loaded 4 R44 adjustment of 90 ips tape speed PCBA Drive Control Variable resistor for adjusting the tape s...

Page 90: ...2 adjustment of VFO operating point PCBA Interface Control Variable resistor for adjusting the VFO operating point Adjust R12 until the DC voltage at TP4 on the PCBA interface control becomes the spec...

Page 91: ...essively high in such a case The gain of the read amplifier is reduced by shorting Sl Normally Sl is used in open status 2 S2 AGC ON OFF PCBA Drive Control D CAS Strap for turning ON OFF the AGC of th...

Page 92: ...ce Control For the contents refer to Item 1 12 1 in the specifications 7 Sl changeover of tape speed PCBA Interface Control For the contents refer to Item 1 12 2 in the specifications However Sl is no...

Page 93: ...SECTION 4 MAINTENANCE 4000...

Page 94: ...he tape thus enhancing the reliability Therefore the magnetic head should be cleaned periodically at the intervals shown in Table 401 in order to secure the reliability of data For how to clean the ma...

Page 95: ...402 Check and adjustment items Mainte Required Descriptive nance Check and Adjustment Items Time Item of Order 90ips I30ips Maintenance 1 Positional adjustment of reel motor F 5 min 4 3 1 R Assty 2 H...

Page 96: ...preamplifier 3 min 4 3 14 level 15 Check and adjustment of read level 2 min 4 3 15 16 Check of feed through 2 min 4 3 16 17 Resolution check 2 min 4 3 17 18 Check of erase level 2 min 4 3 18 19 Check...

Page 97: ...ic function check and adjustment after the replacement of parts 3 The reel motor F Ass y and reel motor R Ass y should be replaced at the same time without fail 4 When the encoder Ass y and the encode...

Page 98: ...10 Min LED hole sensor Assly 17070500 00 15 Min Sensor guide Assly 17070510 00 10 Min Encoder Assly 17967494 00 Note 4 35 Min Encoder roller 16792371 00 Note 4 Solenoid Assly 14770910 00 200000 passe...

Page 99: ...10 Min LED hole sensor Ass y 17070500 00 15 Min Sensor guide Ass y 17070510 00 10 Min Encoder Ass y 17967494 00 Note 4 35 Min Encoder roller 16792371 00 Note 4 Solenoid Ass y 14770910 00 200000 passes...

Page 100: ...r small size d Torque driver 1 5 kg cm e Torque driver 2 5 4 kg cm f Hexagonal wrench 1 5 mm g Nipper h Radio pliers i Tweezers 3 Exclusive simulators and DC power supply a Simulator OA TEAC Part No 1...

Page 101: ...5 Test tapes a Work tape TEAG Part No 19800022 50 b Mirror cassette TEAG Part No 14800093 00 c Alignment tape TRAG Part No 14800090 10 d Speed tape TEAG Part No 14800091 10 e Hole sensor test tape TR...

Page 102: ...htening Torque M2 2 5 kg cm M26 4 kg cm M3 6 kg cm M2 setscrew 2 5 kg cm During the replacement or adjustment of maintenance parts the application of screw lock red is limited only to the following fo...

Page 103: ...d connector f J7 Sensor guide connector g J8 Reel motor solenoid and hole sensor connector h J9 Interrupter connector i JlO Encoder connector 2 Extraction and insertion of connector TIen each connecto...

Page 104: ..._ I I I I I I I I I _ J Top view of MTU J8 J10 W Without PCBA Interface Control Bottom view of MTU Bottom view of MTU Fig 401 Connector types 4011 PCBA Drive Control J9 J4 J2 J2 J4 J9 PCBA Drive Contr...

Page 105: ...the connector b How to insert the connector Set the housing to the position of the post pin and push in the rear of the housing with the finger In this case beware of the following items to prevent mi...

Page 106: ...nector d How to insert the contacts Insert each contact in such a direction that its proj ection is placed on the stopper side of the housing After insertion pull the cables lightly with tweezers to m...

Page 107: ...is a danger that FPC may be damaged b How to insert the FPC While setting the groove of FPC to the partition of the socket insert FPC into the socket Then while depressing FPC to prevent it from being...

Page 108: ...guide by hand in the arrow direction remove it from the main unit Fig 407 2 Attaching method Attach the protector guide to the main unit in the reverse procedure to the above while bewaring of the fo...

Page 109: ...Protector Mounting screws Fig 407 How to detach the protector guide Protector guide o Notch Projection Fig 408 How to attach the protector guide 4016...

Page 110: ...s kept approx 10 mID away from the end of the tube At this time place the LED hole sensor side tube as near to the terminal part as possible 4 Clamp the individual cables of the encoder Ass y reel mot...

Page 111: ...Solenoid stopper Cable tie x o 0 0 Bead PCBA holder Eject button Reel motor F Assly Reel motor R Ass y sensor Ass y Fig 409 Cable treatment within chassis 4018...

Page 112: ...ips Fig 410 Setting of SOA MODE switch 3 Preset the output voltages of the DC power supply to 12 V and 5 V 4 Set the POWER switch of SOA to OFF 5 Turn off the DC power supply and connect the power cab...

Page 113: ...display DATA 2 Readjust the DC power voltages until the 5 V power voltage is within the range of 4 95 V to 5 05V and the 12 V power voltage is within the range of 11 88 V to 12 12V 2 Key in F 3 Key i...

Page 114: ...off the DC power supply and connect the power cable to the DC PWR connector of SOB 3 Connect the power cable to the POWER connector J2 of MTU 4 Connect the interface cable between the MT 2ST INTERFAC...

Page 115: ...MTU r I I JI I I L_ I I I MT 2ST INTERFACE J2 f L j U l TEAC SIMULATOR OB 1 DC POWER SUPPLY 12V 5V Fig 412 Connections of SOB 4022...

Page 116: ...Turn off the DC power supply and connect the power cable to the PWR connector of SOD 3 Connect the power cable to the POWER connector J2 of HTU 4 Connect the interface cable between the MT2 ST IfF con...

Page 117: ...MTU r I I I JI I I I I L_ r h J2 l _1 1 1 I J A MT2 ST IF TEAC SIMULATOR 00 II DC POWER SUPPLY 12V 5V Fig 413 Connections of SOD 4024 PWR...

Page 118: ...ower cable to the pm ER connector of SOE 3 Connect the power cable to the POWER connector J2 of MTU 4 Connect the interface cable between the INTERFACE connector of SOE and J1 of MTU so that the trian...

Page 119: ...I I 1 MTU POWER f INTERFACE r I I JI I TEAC SIMULATOR OE I I I L_ h J2 _ J Il DC POWER SUPPLY 12V 5V Fig 414 Connections of SOE 4026...

Page 120: ...et the reel motor jig While pushing the loading arm in the arrow direction put the reel motor jig on the MTU body with the guide pins as reference and return the arm gradually In this case check if th...

Page 121: ...Guide Mounting screws Ejector Mounting screws motor jig Loading arm Eject button stopper Fig 41S Positional adjustment of reel motor F R Ass y 4028...

Page 122: ...e pressure spring Fig 416 c Put the roller height jig on the height adjusting jig and slide it to the encoder roller side Move the encoder roller up and down until the inner side face of the flange to...

Page 123: ...Pressure o o c J 0 o REF l Fig 416 Setting of jigs 4030 pins Height adjusting jig Loading arm height jig...

Page 124: ...Roller height jig Encoder roller Height adjusting jig Encoder Fig 417 Height adjustment of encoder roller Shaft encoder side Stick o Flange encoder roller side Fig 418 Bonding of encoder roller 4031...

Page 125: ...the POWER switch to the PSA side it is not required to connect a check cable C b Push in the ejector with the finger to bring about the cassette loading status Fig 302 303 c Make sure that the indica...

Page 126: ...o f o o o CJ Fig 4l9 Check of rotary direction of reel motor 4033 Reel motor...

Page 127: ...reference to the guide pins and return the arm gradually Then check if the reference plane touches the two guide pins Fig 420 d Set the POWER switch on SOA to the PSA side e Make sure that the indica...

Page 128: ...Guide pins FPT check jig Loading arm FPT jig Eject button Fig 420 Setting of FPT jig FPT check jig File protector FPT jig7 No gap here Fig 42l Check of file protect sensor 4035...

Page 129: ...nd set the POWER switch to the PSA side it is not required to connect a check cable C b Push in the ejector with the finger to bring about the cassette loading status Fig 30 2 30 3 c Hake sure that th...

Page 130: ...dicator CLD of SOA lights up d Key in A21 to shift the head to the lower side Push the top of the shifted head with the finger and make sure that the head does not move downward e Key in A20 to restor...

Page 131: ...ke sure that there is no curl in the flange part of the encoder roller in the tape stop status If the tape is curled adjust the height of the encoder roller until the curl is sliminated Note When maki...

Page 132: ...ng center position 1 Key in 2 to wind the tape forward and reverse continuously and then turn the adjusting screw until the specification of step e is satisfied Wnen the tape is shifted upwards with r...

Page 133: ...Mirror cassette Tape guides Adjusting screw Fig 422 Loading of mirror cassette 4040...

Page 134: ...Tape guide Curl Flange Fig 423 Check of tape winding tape guide Flange Encoder roller Curl Fig 424 Check of tape winding encoder roller 4041...

Page 135: ...Fig 336 Remark A metal shield may be attached to the PCBA Drive Contrgl in some issue of PCBA In such a case remove the metal shield for the strap changeover 2 Demagnetize the magnetic head using the...

Page 136: ...according to the characteristics of the head and alignment tape Check for the head alignment in the following procedure 1 Key in 0 or 1 to wind the tape nearly to the winding center and then key in F...

Page 137: ...ent adjustment 3 As for the values displayed on SOA DATA 1 I I I2 I 31 means 2 3 minutes and DATA 2 I 1 0 I 1 I 9 I means 19 micrometers 4 If the measured azimuth value are out of the specifi cation 1...

Page 138: ...values of each track meet the specifications 10 After the completion of adjustment successively follow the procedure mentioned in item d Remark 1 If the measurement by SOA is started from the clear le...

Page 139: ...the alignment tape used 2 The alignment tape contains tracks on which the burst signal is not recorded Therefore the following measurements cannot be made i Azimuth of track 0 ii Off track and azimuth...

Page 140: ...Off track adjusting screw B Track 0 Off track adjusting screw A Track 1 2 Azymuth adjusting screw t JJ Fig 426 Adjusting screws of head alignment 4047 Head Ass y...

Page 141: ...the PSA side it is not required to connect a check cable C b Load the work tape on MTU c Connect the oscilloscope to TP8 on the PCBA Drive Control d Key in A63F e Check if the waveform shown in Fig 4...

Page 142: ...ble C b Load the work tape on MTU c Connect the oscilloscope to TP8 on the PCBA Drive Control d Key in A63F e Check if the waveform shown in Fig 428 appears at TP8 Clipped portion TP8 u t Approx 9 ms...

Page 143: ...e times are more than 400 microseconds each g Key in B8 to wind the tape forward and reversely h The voltage level is displayed to the display DATA 1 of SOA during hole detection and to th display DAT...

Page 144: ...HOLE SKIP and REPEAT on SOA light up p Key in 2 The tape is wound forward and reversely alternately with the BOT hole as a center q When the BOT hole passes through the front of the hole sensor obser...

Page 145: ...le sense times are more than 400 microseconds each h Key in B8 The tape is wound forward and reversely i The voltage level is displayed to the display DATA 1 of SOA during hole detection and to the di...

Page 146: ...SKIP and REPEAT on SOA light up q Key in 2 The tape is wound forward and reversely alternately with the BOT hole as a center r When the BOT hole passes through the front of the hole sensor observe the...

Page 147: ...the DATA 2 in ips inch per second units f Check if both the tape seeds are within the range of 90 ips 4 to 4 S6 4 ips to 93 6 ips g Key in S The indicator HIS on SOA goes out low speed mode h Key in B...

Page 148: ...ps t The forward winding encoder frequency is indicated to the DATA 1 display on SOA and the reverse one to the DATA 2 u Adjust R43 on the PCBA Drive Control until both the encoder frequencies are wit...

Page 149: ...ayed to the display DATA 1 on SOA and the reverse one to the DATA 2 j Check if each encoder frquency is within the range of 8 594 kHz 5 to 5 8 14 kHz to 9 024 kHz k If the results of checks at steps e...

Page 150: ...s are within 2 86 kHz to 2 88 kHz tne center frequency 2 865 kHz u Key in F to stop the operation Remark The tape speed should be adjusted in the order of 90 ips R44 and 30 ips R43 without fail If R44...

Page 151: ...time to the DATA 2 f Check if the start time is less than 300 ms and the stop time is less than 250 ms g Key in BI The tape is wound reversely h The start time is indicated to the display DATA I on SO...

Page 152: ...ss than 100 IDS and the stop time is less than 100 ms g Key in Bl The tape is wound reversely h i j k The stop Key Key The start time is indicated to the display DATA time to the DATA 2 Make the same...

Page 153: ...ct the oscilloscope to J4 17 on the PCBA Drive Control e Key in 0 to SOA The tape is wound forwards Measure the deviation width Fig 431 of the waveform at J4 17 as shown in Fig 431 Tri ger rr Deviatio...

Page 154: ...waveform at J4 17 is less than 10 f key in F to stop the operation g Key in 1 The tape is wound reversely Measure the deviation width of the waveform at J4 17 and perform the same check as in step e...

Page 155: ...d level test tape on MTU d Wind the tape nearly in the winding center e Connect the oscilloscope to TP3 on the PCBA Drive Control Key in A22 g Key in A63F Measure the signal level on the oscilloscope...

Page 156: ...level becomes equal to the calibrated value of the level test tape used q Key in F to stop the operation r Key in A2l s Key in A63F Adjust R17 on the PCBA Drive Control until the signal level becomes...

Page 157: ...1 on SOA e Check if the read level is within the range of 1 22 V to 1 72 V center value 1 47 V f Key in ttF to stop the operation g Key in A21 The write read track on MTU is changed over to Track 1 P...

Page 158: ...V center value 1 1 V f Key in F to stop the operation g Key in A2l The write read track on MTU is changed over to Track 1 Perform the same check as in steps d e and f h If the result of step e is out...

Page 159: ...switch to the PSA side b Load the work tape on MTU c Key in C8 The tape is wound forward d The value of feed through is displayed to the display DATA 1 on SOA e Check if the value of feed through is...

Page 160: ...hanged over to Track 2 e Key in C5 The measured value of resolution is indicated to the display DATA 1 on SOA f Check if the resolution is 35 or more g Key in A21 The write read track on MTU is change...

Page 161: ...red value of resolution is indicated to the display DATA 1 on SOA f Check if the resolution is 40 or more g Key in flA21 The write read track on MTU is changed over to Track 1 Perform the same check a...

Page 162: ...e tape is wound forward and reversely d The erase level is indicated to the display DATA 1 on SOA e Check if the erase level is less than 0 161 V Ferrite Head 3 Check procedure a Connect SOA in accord...

Page 163: ...5 and set the POWER switch to the PSA side it is not required to connect a check cable C b Load the work tape on MTU c Key in C6 d The peak shift value is indicated to the display DATA 1 on SOA e Che...

Page 164: ...5 and set the POHER switch to the PSA side it is not required to connect a check cable C b Load the work tape on MTU Cc Key in C7F Cd The asymmetry value is indicated to the display DATA 1 on SOA e Ch...

Page 165: ...tem of check and adjustment allow a warmup time of 10 min or more Cc Load the work tape on MIU Cd Connect the terminal of the digital voltmeter DCV to TP4 on the PCBA interface control and its termina...

Page 166: ...terminal of the digital voltmeter DCV to TP4 on the PCBA interface control and its terminal to GND e f g Key in B2 A3 D41 and M The tape is wound forward Check if the voltage at TP4 is within the ran...

Page 167: ...l check by using the user system Articles to be used a Work tape b D CAS SOB c SCSI SOD d DC power supply D CAS 2 Check procedure a Connect SOB in accordance with Item 4 2 6 b Load the work tape on MT...

Page 168: ...ts a read error test j After the completion of the read error test the transfer block count is indicated in hexadecimal notation to the display of SOB Therefore check if it agrees with the transfer bl...

Page 169: ...hexadecimal notation to the display of SOD Record this value This data is necessary to check if the transfer block count matches when read error test is made by using the same tape Key in B2 B6 B7 Th...

Page 170: ...ion to the display of SOD Therefore check if it agrees with the transfer block count obtained in the write error test k Key in DSO Then the compare error count and parity error count are indicated to...

Page 171: ...base attached onto the base Remark If the insulation sheet is attached to the head Ass y together strip it with tweezers d Attach the new head Ass y in the reverse procedure to the above Remarks 1 At...

Page 172: ...15 k Check the feed through in accordance with Item 4 3 16 1 Check for the resolution in accordance with Item 4 3 17 m Check for the erase level in accordance with Item 4 3 18 n Check the peak shift i...

Page 173: ...Head Ass y Insulation sheet Head screw Head coller Fig 434 Replacement of head Ass y 4080...

Page 174: ...e Connect the connector J6 f Detach the PCBA Interface Control in accordance with Item 4 4 10 g Check and adjust the head alignment in accordance with Item 4 3 8 h Check the AGC operation in accordan...

Page 175: ...Head Ass y Insulation sheet Head screw Fig 435 Replacement of head Ass y 4082...

Page 176: ...e which clamps the cables of the reel motor F R Ass y Fig 436 f Extract the contacts of the reel motor F R Ass y from the connector housing terminal Nos 5 6 7 and 8 g Remove the cables of both the ree...

Page 177: ...em 4 2 4 m Adjust the positions of the reel motor F R Ass y in accordance with Item 4 3 1 n Check the rotary direction of each reel motor in accordance with Item 4 3 3 0 Check and adjust the tape spee...

Page 178: ...R Ass y Loading arm M PCBA holder Bead Cable tie Reel motor F ASs y Fig 436 Replacement of reel motor F R Ass y 1 4085...

Page 179: ...Reel motor F Ass y Reel motor R Ass y Tube Pan screw No O 2 6 x 2 8 Fig 437 Replacement of reel motor F R Ass y 2 4086...

Page 180: ...e new interrupter C Ass y in the reverse procedure to the above At this time beware of the following items i Insert the three positioning parts of the interrupter C ASs y exactly into the chassis hole...

Page 181: ...i Pan sems screw 2 x 5 I Interrupter C Ass y Fig 438 Replacement of interrupter C Ass y 1 4088...

Page 182: ...parts Fig 439 Replacement of interrupter C Ass y 2 Interrupter C Ass y Contact Photo interrupter Surface Interrupter C Ass y Lever base Clearance here Loading arm M Fig 440 Replacement of interrupter...

Page 183: ...e cable tie which clamps the cables of the LED hole sensor Ass y Fig 436 e Extract the contacts terminal Nos 9 10 of the LED hole sensor Ass y from the connector housing f Remove the two cables of the...

Page 184: ...assis in accordance with Item 4 2 4 1 Check and adjust the BOT EaT hole sensor in accordance with Item 4 3 10 m Attach the PCBA Interface Control in accordance with Item 4 4 10 n Perform the overall c...

Page 185: ...Pan sems 2 x 5 TUbe LED hole sensor Ass y Fig 44l Replacement of LED hole sensor Ass y 4092...

Page 186: ...r guide Ass y Fig 442 Cd Attach the new sensor guide Ass y in the reverse procedure to the above When there is the shim between the sensor guide and chassis attach the sensor guide Ass y with the shim...

Page 187: ...Pan sems screw 2 x 5 Sensor guide Ass y Shim Sensor guide Fig 442 Replacement of sensor guide Ass y 4094...

Page 188: ...the two mounting screws from the encoder Ass y and detach the encoder Ass y encoder spring and pin spring Fig 444 h At tach the new encoder Ass y in the reverse procedure to the above Then turn the ca...

Page 189: ...e head alignment in accordance with Item 4 3 8 q Check the AGC operation in accordance with Item 4 3 9 r Check and adjust the read level in accordance with Item 4 3 15 s Attach the PCBA Interface Cont...

Page 190: ...Encoder roller Fig 443 Replacement of encoder roller 4097...

Page 191: ...Cap screw 2 x 6 Triple screw 2 x 8 Encoder Ass y Encoder spring Pin spring Fig 444 Replacement of encoder ASs y 4098...

Page 192: ...Tilt adjusting jig Fig 445 Setting of tilt adjusting jig Tilt adjusting jig Shaft Cap screw Chassis Fig 446 Tilt adjustment 4099...

Page 193: ...onnector J6 h Remove the three mounting screws from the head base Ass y Lift the head shift Ass y with the head Ass y kept attached and detach it from the main unit Fig 447 i Remove the two mounting s...

Page 194: ...Connect the connector J8 n Push the cables of the solenoid Ass y into the PCBA holder 0 Fix the cables of the LED indicator to the cord clamper p Check the head shift in accordance with Item 4 3 6 q...

Page 195: ...Binding screw 2 x 6 Cord clamper Head Ass y Head shift Ass y Solenoid ASs y LED indicator Fig 447 Replacement of solenoid Ass y 1 4102...

Page 196: ...Cord clamper Solenoid Ass y Shift spring Head base Ass y Shift collor Fig 448 Replacement of solenoid ASs y 2 4103...

Page 197: ...Cut face of chassis Positioning portion of head base Ass y Encoder Ass y As viewed from the rear of main unit Fig 449 Positioning of head base Ass y 4104 Head base Ass y Solenoid ASs y...

Page 198: ...er g Extract the connector J6 h Remove the mounting screws from the head Ass y and detach the head Ass y head collar and insulation sheet Be careful not to damage the front face of the head Ass y deta...

Page 199: ...i Remarks 1 Attach the tape guide straight If the tape guide is attached otherwise it touches the cassette tape windo 1 thus preventing the cassette loading from being made normally 2 Reuse the same...

Page 200: ...f the head Ass y detached Fig 435 i Remove the two mounting screws from each tape guide and detach the two tape guides and shims tape guide Fig 450 j Remove the three mounting screws from the head bas...

Page 201: ...cassette tape window thus preventing the cassette loading from being made normally 2 Reuse the same shims at the same place before replacement of the head base Ass y at used Use of other shims may aff...

Page 202: ...Pan scre v 2 x 8 Shim Tape guide Tape guide Fig 450 Replacement of head base Ass y 1 Binding screw 2 x 6 Cord clamper Head shift Ass y LED indicator Fig 451 Replacement of head base Ass y 2 4109...

Page 203: ...Pan sems screw 2 6 x 6 Cord clarnper Solenoid Ass y Shif t s pring Head base Ass y Shift coller Fig 452 Replacement of head base Ass y 3 4110...

Page 204: ...Item 4 2 2 d Remove the three clamping screws from the PCBA Drive Control and detach the PCBA Drive Control from MTU e Attach the new PCBA Drive Control in the reverse procedure to the above f Check...

Page 205: ...ontrol and detach the PCBA Interface Control from MTU Cb Attach the new PCBA Interface Control in the reverse procedure to the above c Check and adjust the VFO operating point in accordance with Item...

Page 206: ...Remove the four mounting screws from the front bezel Ass y and extract the front bezel Ass y from the main unit Fig 453 d Attach the new front bezel Ass y in the reverse procedure to the above At this...

Page 207: ...Cord clamper LED indicator Binding screw 2 6 x 4 Front bezel Fig 453 Replacement of front bezel Ass y 4114...

Page 208: ...button from the main unit with the fingers Fig 454 b Attach the new ej ect button to the ej ect lever and push in the eject button up to the end After attaching the eject button make sure that it won...

Page 209: ...SECTION 5 DRAWINGS AND PARTS LISTS 500...

Page 210: ...3 Table 501 Main components configuration of MTU Transport Sub Ass y Head shift Ass y Head base Ass y L Solenoid Ass y part Reel motor F Ass y rTransport J Reel motor R Ass y Interrupter C ASs y LED...

Page 211: ...PCBA Drive Control Protector guide Transport Sub Ass y Front bezel Ass y Eject button Fig SOl External view 1 502...

Page 212: ...Head base Ass y Encoder roller Solenoid Ass y Head Ass y Sensor guide Ass y Fig 502 External view 2 503...

Page 213: ...Reel motor R Ass y PCBA Encoder Ass y Interface Control Reel motor F Ass y Fig 503 External view 3 504...

Page 214: ...LED hole sensor ASs y Interrupter C Ass y Fig 504 External vie 4 505...

Page 215: ...5 15532062 01 Interrupter C Ass y 1 6 17070500 00 LED hole sensor Ass y 1 7 13090495 Tube 2 5 1 8 17061057 00 Reel motor F Ass y 1 9 17061058 00 Reel motor R Ass y 1 10 13090495 Tube 2 5 1 11 17967412...

Page 216: ...A Drive Control 1 30 15532058 00 PCBA Interface Control 1 31 17967210 00 Front bezel Ass y 1 Note 3 32 16787276 01 Eject button 1 Note 3 Note 1 The PCBA stud changes in the length of the hexagonal par...

Page 217: ...Fig 505 Disassembly drawing 0 508 al section f mechanlc...

Page 218: ...an sems screw 2 x 5 S ZMC S3 16470006 Pan sems screw 2 6 x 6 S ZMC S4 16410206 Binding screw 2 x 6 S ZMC S5 16410004 Binding screw 2 6 x 4 S ZMC S6 16498559 Triple screw 2 x 10 S ZMC S7 16475005 Pan w...

Page 219: ...ectric power factor Plastic film capacitor Tantalum solid state electrolytic capacitor Ceramic capacitor semiconductor 2 In the part name rating column the percentage display indicating the tolerance...

Page 220: ...er issue J U5 l3441346 IC 74LS123 Before issue H U5 13447452 IC 592 After issue J U6 13447564 IC M51836FP 16191162 Heat sink For U6 before issue H 16191164 00 Heat sink For IT6 after issue J 16401206...

Page 221: ...13411183 Diode Fl4A CR8 13411183 Diode Fl4A CR9 13411405 Diode DA203 CR10 13411405 Diode DA203 CRll 13411260 Diode 1SS97 R1 11186751 Resistor RD 1 5W 750 OHM 5 Issue A R1 11176751 Resistor RD 1 2W 75...

Page 222: ...ssue EB EG FB G H Rll 11983048 Resistor RN 1 4W 20K OHM 1 R12 11983042 Resistor RN 1 4 17 4K OHM 1 R13 11186105 Resistor RD 1 5 1 IHOHM 5 R14 11176750 Resistor RD 1 2W 75 OHM 5 Issue A B C D E BE CE E...

Page 223: ...7 11186202 Resistor RD 1 5H 2K OHM 5 R38 11186102 Resistor RD 1 5W lK OHM 5 R39 11054221 Resistor RN 1 4W 220 OHM 1 Issue A B C D R39 11054331 Resistor RN 1 4W 330 OHM 1 Issue BE CE and after E R40 11...

Page 224: ...istor RD l 5 120K OHM 5 After issue K Cl 12903408 Capacitor CK 50V 470pF 10 C2 12901900 Capacitor CE 16V 10UF 20 Before issue R C2 12903080 Capacitor CG 25V O IUF 20 After issue J C3 12903377 Capacito...

Page 225: ...sue B C26 12903080 Capacitor CG 25V 0 1UF 20 C27 12903080 Capacitor CG 25V O lDF 20 C28 12901911 Capacitor CE 50V 0 47UF 20 C29 12901910 Capacitor CE 50V 0 33UF 20 C30 12903080 Capacitor CG 25V O lUF...

Page 226: ...Capacitor CG 25V O 1UF 20 After issue J C57 12903080 Capacitor CG 25V O lUF 20 After issue J C58 12903080 Capacitor CG 25V O 1UF 20 After issue J C59 12903080 Capacitor CG 25V O lUF 20 After issue J...

Page 227: ...21109 i Connector 4P I 16322368 I Clamp i Clamp for J2 I J4 13122509 00 Connector 30P I I J5 to 7 13122510 00 Connector 22P I i J9 13122463 I Connector 14P I i TP1 131 2469 00 i Connector ISP i 1 to L...

Page 228: ...15532057 00 Symbol TEAC Part No Part Name Rating Remarks No 16271176 04 Nameplate 519...

Page 229: ...l3299245 IC socket 28P For U3 issue A B U4 13442562 IC 82C54FP 6 US l3442571 IC HM6116LFP 4 U6 13442382 IC 81C55GS U7 l3442563 IC 82C37AP U8 l3441636 IC 74LS257AN U9 l3442574 Ie 80C85AGS UIO l3441233...

Page 230: ...Diode 1SS133 CR3 13411384 Diode ISS133 I Rl 11186472 Resistor RD 1 5W 4 7K OHM 5 R2 11186510 Resistor RD 1 5W 51 OHM 5 R3 11186472 Resistor RD 1 5W 4 7K OHM 5 R4 11054682 Resistor RN 1 4W 6 8K OHM 1 B...

Page 231: ...e C RAI 13492290 Resistor network 5 1K OHM x 4 RA2 13497250 Resistor network 220 330 OHM x14 Cl 12903080 Capacitor CG 25V O lUF 20 C2 12903080 Capacitor CG 25V O IUF 20 C3 12903080 Capacitor CG 25V O...

Page 232: ...Capacitor CS 16V 3 3UF 20 Cl7 12902015 Capacitor CE 16V 47UF 20 C18 12903991 Capacitor CQ 50V 330pF 2 C19 12902526 Capacitor CS 16V 3 3UF 20 C20 12902526 Capacitor CS 16V 3 3UF 20 C21 12902526 Capacit...

Page 233: ...21364 Connector S8P Before issue B GND TP1 to 13121365 Connector S9P After issue C GND TP7 to 13121705 Connector 3P GND 13152467 Connector Plug for TP7 8 G 16787534 00 Shield sheet Ie 16359289 00 Spac...

Page 234: ...1EMO 525...

Page 235: ...r C 2 13419234 Photo interrupter 3 13419234 Photo interrupter 4 13427141 Transistor 2SD288 5 16362140 Insulation sheet 6 16191158 01 Heat sink 2 7 16470310 Pan head sems screw 3x10 S ZMC 8 16490004 Nu...

Page 236: ...Fig 506 Interrupter C Ass y 527...

Page 237: ...h variable resistor is 1 2 W 4 Capacity unit of capacitor The unit of capacity of each capacitor is micro farad unless otherwise specified and pF picofarad when specified with p 5 Capacity tolerance o...

Page 238: ...5 4 1 Overall circuit diagram Circuit board interconnections 529...

Page 239: ..._____ r_ I__ J9_3 MOTOR FWD b R E D__crJ 8 _7 ___ t_ Q J 9 4 MOTOR EV BlK J8 8 RAI 120 WHT Je 9 2 r J9 9 5V LL _____8 L U _ o J 8 IO _ _ __t_t _y J 9 05 CV t I I r TRANSISTOR I I I J9 12 C f___j J9 10...

Page 240: ...3 6V OUT 2 31 9 10 5 15 18 PRE R47 150F C47 O tM 25V 30 AGC OUT AGC OUT 31 z Z I U U I o I U I 7 10 C430 IM 25V GND 23 26 OV 15 C440 IM 25V V5 t t 5 V dA C 6 C34 470pG dA C t J NIr J R39 330F o A8 S t...

Page 241: ...IC DRIVER R44 2kM 2529 00 CLK L 1 2Wl l 6 CLOCK 5V 19 CLK UL C20 4 7M 24 CLOCK H 35V 3 I FB R35l SkF S LiM hS LiM I S LiM 18 I Ll 0 33MlI7 FV GOINT 23GOINT H A RUN 22 RUN H R36 3 F l2S FV ROY 31 ROY...

Page 242: ...o 0 TP I 01 I C46 1 C 4 7 O 37 d L6 P _ 3 L __ _ _ PI HO olt _ t 3 S2 N C34 0 I R I o o I C33 I I C30 I G 8 E 9 E 9 8 C62 I SOLDER SIDE N r I I l L__ __ o 0 4 C22 I ill CI7 I 05 IC24 I I i CIS I I o 2...

Page 243: ...IN J 10 U L3 150 R46 150F 30 US M51836FP dA OUT 4 VI2 32 Bt2V 6 C43 O tM 25V GND OV 15 C440 tM 25V V5 ___ t 5 V dA C C34470pG 6 LrY Y _ L6 1 1 150 f z z dA C 1 5 Vv __ J I R39 330F F J C518 5 13 3 TP...

Page 244: ...7M CLOCK J 35V 14 S LIM hS LlM SwUM Ll GOINT 23GOINT H rC2 9 033M REF OSO 30DSO U C21 0 E FV RUN 22 RUN H RDY 31 ROY Ll T10 MI 16V REF It r r 1 J ____ r_R A M_ rP B 21 26 32 IS l 9 l b F OV oM 7 r CI...

Page 245: ...N r 1 8 T NAME PLATE SOLDER SIDE r I I L ________ l o COMPONENT SIDE LI _8_ _7__________________________ __ ___T_ 1 R B I G1 L8 0 I05 04 III m 8 m a U9 o 0 I C55 II C54 II C57 II C56 I o o G R l filil...

Page 246: ...5 4 2 PCBA drive control Circuit diagram Parts location diagram 531...

Page 247: ...7______ j3 A7 D7 1 9____ A D 7 ______ r _ A_ 0_ 6_____ Z2 j D6 A61 3 9____ A6 ____ 1 ___A 8____ 25 j A8 U3 A D 7_____ 21 A7 J 4 0____A 7____ 1 __ A 9____ 24 j A9 2764 ____ 3d MEMR 16 t ___ A 10 __ 2...

Page 248: ...k 4 RD q C5 r 9 1 AO r I0 1 AI 18 13 WOACK L I t r I UI4 2309 32 DROP 4t 33 SYNC U 15 TP2 TP I LS04 28 10 UI5 29 L5049 12 WDREQIH f MEMRIL 1 r_ b 82C54 6 RDACK L I tI 1 4 EOP L I _ 2_4 1 RCLK 22 I I j...

Page 249: ...6 HB3 27 HB4 28 HB5 29 HB6 30 HB7 31 HBP 32 XFR 33 REO 22 ONL AD 0 H I 10 I DO AD I H I 2 01 3 AD2 H I D2 AD3 H II 41 03 5 AD4 H 1 D4 AD5 Hll 6 05 7 AD6 H I D6 8 AD7 H 1 D7 AO H 1 9 AO AI Hli 10 AI II...

Page 250: ...H 2 0 RD L I 4 RD 5 I J4 10 WR L I WR TOUT IFCLK H 2 3 BLKDET H 2 0 LTH 2 J4 9 HEM L J 101M WENA Hl2 0 WEN 6 ALE Vee 17 39 5V J4 8 ALE H 1 EENA H 2 0 EEN 42 THIN GND 16 CPUCLK H 1 OV RST CPURST H 1 1...

Page 251: ...8 EJi i EJ II J _ 0 29 o r iI I 1 5 _________ __ ____ __ ______ __ J 111 J I j G I 1 O I U l Xnit I L o B l I jf Ul j I I PfJr 9lb I I f2l i i i t I l TS E t 0 C _ l 1tl z t _ _ ___________________ _...

Page 252: ...5 4 3 PCBA interface control Circuit diagram Parts location diagram 538...

Page 253: ...t5 ifj 0298 24 2865 ffl 7 ffi g Pfr 564 1I 83 m IBT 3 34 10 i ffi 06 384 6 0 4 I 1ft c5I i g ffl 464 c5JimT i KJI tlJiMl 3 2 3 1t c51i 052 782 4 5 8 11ft fb g 8 Pfr 730 ft J m r p K e 111 0 IBT 13 19...

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Teac MT-20D-IO, Maintenance Manual

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