SERVICE MANUAL - The Sharp MZ
Contents
1. Packing method Replacement parts list m General specifications Specification Specification AC 220 10 50 Hz 143K bytes drive AC 240V 10 50 Hz for U K 286K bytes unit 40W at AC220V 45W at AC240V Memory capacity No of tracks 70 tracks drive Width 205 mm 16 sectors track i i Depth 320 mm ight 204 mm Height Operating Temperature 5 to 25 conditions Relative humidity 20 to 80 Specifications subject to change without prior notice Accessories Power cord 1 pc for improvement Braided wire 1 pc Instruction manual 1 copy Option Floppy interface card MZ 80FIO Disk Basic MZ 80FMD Connectin flat cable MZ 80F 15 Extension flat cable MZ 80F 05 Diskette MZ 80FBD a set of b pcs Disk drive specifications 143K bytes Memory capacity 12V DC 596 0 9A TYP 1 8A MAX 5 DC 5 0 7 1 0 MAX DC power supply requirements No of tracks 70 tracks Recording system FM Medium rotational speed 300 rpm Power consumption 12W TYP Information transfer rate 125K bits sec Width 146 mm Depth 203 2 mm Height 82 6 mm Outer dimensions not included Average response time 100 msec Head load time 50 msec 1 6 kg2. Perspective View Parts fitted face Opposite side Note Pin 12 and pin 22 of IC7 ROM are short circuited with jumper wire or PWB pattern in the course of production m IC Pin Assignments Top View IC 1 12 RH IX0074PAZZ 5 741504 2 3 RH iX0077PAZZ SN74LS30N 4 RH iX0078PAZZ SN74LS32N IC6 RH iX0215PAZZ SN74LS174N TOL THON E geras 1 12131405 161 78 IC 9 RH iX0081PAZZ SN74LS139N SELECT DATA OUTPUTS ENABLE 2G 2B 2Y02Y12Y22Y3 ss G B YO Y2 Y3 1G 1B 1Y01Y11Y21Y3GND ENABLE SELECT OUTPUTS IC 15 18 RH iX0079PAZZ SN74LS74N IC 7 RH iX0219PAZZ ROM SN74S474N eH 8 NC 07 06 0504 7 03 4 A2A1AO 00 01 02 FUNCTION TABLE INPUTS OUTPUTS ENABLE SELECT G 0 1 v2 H high level L low level X irrelevant IC 16 RH iX0127PAZZ SN74LS107N IC 20 RH iX0214PAZZ SN74LS122N IC 21 RH iX0131PAZZ SN7414N IC8 RH iX0124PAZZ SN74LS245N IC5 RH iX0071PAZZ SN74LS02N IC 10 17 RH iX0070PAZZ SN74LS00N IC 11 RH iX0141PAZZ SN74LS125N IC 19 RH iX0217PAZZ SN74145 INPUTS VcCA B C D 9 BCD TO DECIMAL 0123456789 0 1 2 3 4 5 OUTPUTS 1C22 24 RH iX0220PAZZ SN75452BP OUTPUT IC 13 RH iX0216PAZZ SN74LS161N B
3. 5 Control signal m Vcc 5V CLOCK ROM 320 x 24 bits generator e GND 1 REMPORTER 2 Pin connections vGG 1 4011 vcc MSB 12 39 SEM Select command status register Command b s C2 38 INDEX Index hole Ci 37 CRDY Controller ready Co LSB 5 36 GND MSB 6 35 WRITE DATA Write data De 34 DRDY Drive ready Ds 33 WPR Write protect Data bus D4 32 TRZ Track zero T3444M 31 TND Transfer end D2 151 SYN Synchronize Di WTG Write gate Do LSB HDL Head load Request memory reference ROM STP Step Input output IN OUT DRC Direction Select track register SET SDS Side select Select sector register SES INIT Initialize Receive transmit R T CLOCK Clock Permit memory reference PRM WINDOW Window GND READ DATA Read data 3 Pin description and function Input ioti Inp t Function Description output Function Description output tio vGG Power 5V INIT Input Initializes resets LSI C C Input Used to transfer command status SDS Output Command signal to select either output 3 state output _ side or side 1 of diskette Do D Input Used to transfer track sector DRC Output Command signal to dictate the output address as well as read write data direction when s
4. o 4 SHARP SERVICE MANUAL ui PDSM880004 MZ Floppy disk Model MZ 80FD Extension floppy disk Model MZ 80FDK MZ 80FD Floppy disk I O card Model MZ 80F 10 Microcomputer peripheral devices developed for access to newly designed software regions in Personal microcomputer System MZ 80 Series MZ 80FDK e 5 25 inch floppy disk of miniaturized dual drive type In 2 drive mode 286K byte data be random access processed at high speeds Extension floppy disk MZ BOFDK may be nected in daisy chain system thus enlarging the memory capacity up to 5 2K bytes Precision devices composed of 2 disk drive units and switching regulator power supply The head can be P mz brought into contact with diskette only when needed to extend the life time of diskette and head MZ 80FIO SHARP CORPORATION Contents MZ 80FD and MZ 80FDK specifications Precautions servicing Differences between MZ 80FD MZ 80FDK System block Circuit diagram of floppy disk I O card MZ 80FIO Operational principle of floppy disk Inspection and replacement of disk drive main parts Repair Power supply section Circuit diagram and printed wiring board Disassembled views
5. 5 I 52 170 319 SLIM 9 osirin 993118M gt Noisy D AS D 31lIHA suo oi PTT 22 ey lt s gt E osir I7 4 295 81 YAZI 27 u Disk drive PWB circuit 2 00 49516 5 Md 1no lt 22 ewesy 339315 zb 00 50 11 gt INN 1 AS LA J AS HOLIMS OO 1 on WOO 02 14315 I 123136 57109 28 peay 912 40 ie 022 U 494 ud 2 YEE 10 IV AS sit NPO 222 10310 ferie NE Shu vosi 18 7 uv 805836 X30NI Moo 122 2 87 Xv X30NI m Sos 118 271 otu CNN 187975 ae asvua lt 282 viva ISH O If 9 01 3 LIYM Qv3H E 5 o 2 bs x OV3H a Printed Wiring Board Disk Drive Section 440051 E ais Perspective View Parts fitted face Opposite side 30 Disk drive PWB arrangement of test pins connector pins
6. Check repair procedure for power supply section See pages 21 and 22 Is power supply circuit abnormal Check bootstrap function for ER CANT BOOT MZ 80FIO See page 6 Trace the cause from the contents Does error occur during operation of error message See page 20 Check by replacing several sheets of diskette to see if errors occur due to faulty diskette data deterioration caused by foreign matters deformation wear out damage magnetism etc Troubles in disk system often cause error messages Trace the cause from the contents of error message Replace suspected parts in the disk system with normal ones Check again the trouble section 1 Personal computer MZ 80K 2 Interface unit MZ 80IO 3 1 0 card MZ 80FIO 4 Diskette MZ 80FMD MZ 80FBD 5 Flat cable MZ 80F 15 MZ 80F05 6 Disk drive The signal circuits of floppy disk and 1 card operate at TTL levels of OV 5V Connect any system other than micro computer peripheral devices for MZ 80 series to see if signal levels are out of the range of 0 to 5V max 5 25 m Error chart for disk system Error code Cont Check i d Error message ontents eck Item and corrective action 50 NO READY 54 UNFORMAT 41 DISK DATA ERROR 1 Drive fails to be ready O Diskette is wrongly inserted Motor does not normally run Index detection circuit is improper Flat cable is
7. Motor starting time Power supply section specifications mm AC 220V 10 50 Hz AC 240V 10 50 Hz for U K DC 12V DC 5V PRECAUTIONS O The floppy disk is a precision device Be careful not to give it an impact Avoid servicing a dusty place Take care not to allow foreign matters to come in the machine For diskette as well Be sure to use the specified power supply voltage Completely separate the power supply line from other equipments emitting noises such as large sized motor or cut off noises being mixed in the power supply line with a line filter or the like Do not operate or service the unit near appliances generating magnetism otherwise malfunction and or erasure of data and texts written in diskette may result Arrange system signal cables flat cable etc as far from other devices and power supply cord as possible Before transportation or moving to other place be sure to attach the mouthpiece to the front door DIFFERENCES BETWEEN MZ 80FD AND MZ 80FDK The extension floppy disk MZ 80FDK is connected between floppy disk MZ 80FD O card MZ 80F IO to enable 4 units of disk drive drives 1 to 4 MZ 80FD MZ 80FDK DRIVE TLABZOO29PAZZ TLABZOO34PAZZ Drive indication label 8 DRIVE DRIVE 8 a TLABZOO33PAZZ TLABZOOS3BPAZZ s
8. 15 and 1 16 See page 7 Check drive unit and diskette Replace if required Replace drive unit 2 Diskette O CRC error in data field O Data field is broken down O 10 field is defective O Data mark detection error O Initialize again or replace diskette 3 Floppy disk 1 card is faulty O Pattern is broken or bridged O Conductive foreign matters entered O Check pattern O Check for foreign matters 20 12V Transistor O Chopping Circuit Rectifying and Smoothing Circuit Transformer Transistor 45V Chopping O Waveform of Each Part Waveform of pi of IC1 and bi xD 1C2 Waveform of pin 2 of IC1 Q301 collector waveform Waveform of pin 42 of 2 Q401 collector waveform 2 23V 12us 45us m Trouble Shooting Chart Problem 1 No voltage appears at any output terminal Is there AC 220V 240V for U K present across C101 Problem 2 12 is not developed Is there AC 20V present across the yellow lead of T101 No Check T101 Is there DC 23V Yes present across C201 Problem 4 5V is not developed 1 there AC 20V present across the yellow lead of T101 No Check T 101 15 there DC 23V present across C201 Check AC cord AC socket F101 AC switch and C101 Check D201 short circuit af
9. AE AA AA AF AA AB AP AR AM AR MEMO A800820HO Printed in Japan
10. J1 Interface codes RETURN RESERVED RETURN RESERVED RETURN DRIVE SELECT 3 RETURN IN DEX RETURN DRIVE SELECT 0 RETURN DRIVE SELECT 1 RETURN DRIVE SELECT 2 RETURN MOTOR ON RETURN DIRECTION SELECT RETURN STEP RETURN WRITE DATA RETURN WRITE GATE RETURN TRACK 00 RETURN WRITE PROTECT RETURN READ DATA RETURN SIDE ONE SELECT RETURN RESERVED PWB back side solder fitted side PWB front side parts fitted side J2 Power supply J3 Transducer Wire color 12V DRIVE MOTOR 12V RETURN DRIVE MOTOR Blue MOTOR ON Brown FLAME GROUND HEAD LOAD HEAD LOAD 12VDC 12V STEPPER Black STEPPER Yellow STEPPER 12V STEPPER Brown STEPPER C STEPPER Yellow TRACKOO SWITCH NORMAL CLOSE SWITCH NORMAL OPEN Key TRACK 00 SWITCH RETURN IN USE LED RETURN IN USE LED INDEX LED RETURN INDEX LED INDEX PTX RETURN W P LED RETURN INDEX PTX 1W P LED Yellow W P PTX RETURN W P PTX SHIELD HEAD 0 SHIELD HEAD 1 KEY ERASE HEAD 0 W R ERASE RETURN HEAD 0 W R HEAD 0 ERASE HEAD 1 W R ERASE RETURN HEAD 1 W R HEAD 1 W R HEAD 0 Test points PRE AMP 1A PRE AMP 1B PRE AMP 2A PRE AMP 2B INDEX W R HEA
11. NO PART NO POWER SUPPLY UNIT SECTION DBO XD0009PAZZ INTEGRATED CIRCUIT IC2j RH iX0151PAZZ DESCRIPTION Assembled Power Supply unit Not replacement item SG3524 TRANSISTORS AND DIODES 2d Oabi VS2SA892 1 0201 VHDS5VB10 1 D301 D302 En VHDERB81 004 0402 1 RH PX0033PAZZ RESISTORS R301 Ban VRD ST2EF272J R302 im VRE GV3DBRO5K R303 Basal VRD SU2EF563J Raoa VRO SU2EF272 M na05 VRD SU2EF472J R306 aos VRD ST2EF472J R407 R307 VRO ST2EF153J R308 VRD SU2EF332J R309 VRD ST2EF102J R408 X VRD SU2EF392J VR301 o RVR MOO10PAZZ CAPACITORS 2 102 20180 22 C201 j VCEAAU1VM258Y C206 C301 Y y VCKYPU1NB104Z C302 VCOYKU1HM222K 2SA892 S5VB10 ERB81 004 or RK 14 LED 2 7K ohm 1 4W 0 05 ohm 2W 56K ohm 1 4W 2 7K ohm 1 4W 4 7K ohm 1 4w 4 7K ohm 1 4W 15K ohm 1 4W 3 3K ohm 1 4W 1K ohm 1 4W 3 9K ohm 1 4W Variable Resistor 1K ohm 2 500MFD 35V Aluminum 12V Ceramic 0 0022MFD 50V Film REF CODE No C303 C403 304 C305 C406 C306 C307 C407 C409 C308 C402 C405 AN C404 AL AG AD L401 AA AD AA AA AA 5 AA 6 7 AA 8 AA 9 AA AA 10 11 3 AF AB AA 13 14 15 16 17 40 PART NO VCQY KU1HM183K VCEAAU 1CM338M VCQY KU1HM102K VCSACU1IVE106M VCOY KU1HM682K VCQYKU1HM332K VCEAAU1AM338M RTRNZOOO7PAZZ RTRNZOOO9PAZZ MISCELLANEOUS QFSHAO001PAZZ DSO
12. 4 For reassembly take the reverse order Note In replacing PWB unit it is necessary to check which short pins to cut and whether or not terminal resistor is required depending on which drive unit to use DRIVE No Short pin Detach the short pins from the old PWB unit and apply them to a new PWB Terminal resistor 1f the old PWB unit has no terminal resistor remove terminal resistor from a new PWB PWB unit fixing screw 3 4 pes 2 Connector power J3 connector J1 signal connector J4 connector Terminal resistor 14 2 Setting of short pins and terminal resistor Before delivery the drive units No 1 thru 4 are factory adjusted as tabulated below MZ 80FD 2 Short pin 0 OPEN Head load takes place by drive select That is when signals of which drive is shorted among the short pins DSO DS1 DS2 and DS3 become low head load is caused 0 0 3 DRIVE SELECT signals MX When using one drive unit DSO thru 083 become invalid by shorting this pin Select will be constantly kept HM When motor ON signals become low head load occurs 4 Index lamp assembly 1 Inspection D Connect power socket to connector J2 of PWB unit Turn power on 2 Make sure that there is a voltage range of DC 1 to 1 7V between B 11 lower white lead of the 11th pin from power so
13. AR AB AB AE AE AF AE AL BD REF NO PART NO IC8 RH iX0124PAZZ IC9 RH iX0081PAZZ IC10 i RH iX0070PAZZ IC11 RH iXO141PAZZ RH iX0216PAZZ IC14 RH iX0213PAZZ IC15 icis RH iX0079PAZZ 1 16 RH IX0127PAZZ IC19 RH 1X0217PAZZ IC20 RH iX0214PAZZ 21 RH iXO131PAZZ 22 RH iX0220PAZZ IC24 RESISTORS R1 RA VRD SC2EF221J R6 R8 R5 R10 R11 VRD SC2EF 102 R13 R14 R7 VRD SC2EF 1825 R9 VRD SC2EF561J R12 i VRD SC2EF 1515 R19 R15 VRD SC2bF273J CAPACITORS VCT YPUTBD104Z C2 VCEAAU1CW107Y C3 7 VCSACUTAET106K 17 19 C4 R J E VCCSPR 196331 C5 V 1H 1J 2 CCSPR1H656 C6 C10 C12 C16 VCSACUTAES3S36K C18 C20 C14 VCCCPR1H3101J C15 VCOY KU1HM333K MISCELLANEOUS XTAL CN1 41 RCRSAO0009PAZZ 70049 72 QSOCZ0010PAZZ QSOCZ0012PAZZ DESCRIPTION SN74LS245N SN74LS139N SN74LSOON SN74LS125N SN74LS161N LSI T3444M SN74LS74N SN74LS107N SN74145 SN74LS122N SN7414N SN75452BP 220 ohm 1K ohm 1 8R ohm 560 ohm 150 ohm 27K ohm 0 1 MFD 100 MFD 10 MFD 330PF 560PF 33 MFD 100PF 0 033MFD 1 4W 1 4W 1 4W 1 4W 1 4W 1 4W 12V Ceramic 16V Aluminum 10V Tantalum 50V Ceramic 50V Ceramic 10V Tantalum 50V Ceramic 50V Film Crystal Oscillator 8 MHz 34 Pin Connector 24 Pin IC Socket 40 Pin IC Socket CODE AT AL AE AK AN BS AG AG AM AH AM AK AA AA AA AA AA AB AB
14. IN direction to diskette center 4 Step signal This signal is given to move the R W head in the direction designated by the direction select signal The operation is done in the course of changing from low levels to high levels 10 5 Write data signal This signal is used to write in data on the diskette Each time changing high levels to low levels the current flowing in the R W head is reversed to write in data bit This write in performance is available when write gate signal is at low levels 6 Write gate signal This signal being at low levels data can be written on the diskette At high levels read out or sequential operation may be made 9 Side 1 select signal This signal is given to decide which side of a double face diskette to read or write The R W head of side O and that of side 1 are selected at high levels and low levels respectively 2 Output signals There are the following four kinds of output signal CD Index signal By this signal the starting position of each track can be detected Each time the index hole of diskette is detected with the detector the track is fed from the drive unit Usually this signal level becomes low each time the hole is detected at high levels Therefore the leading edge of the signal indicates the beginning of a track 2 Track 00 signal The low level state of this signal signifies that the R W head is located at track 00 position the outermo
15. and close the front door 4 Carry on head load 5 Make sure that the stroboplate attached on the spindle pulley appears to be stationary Note The shifting rate of stroboplate is allowed to be up to 1 5 pcs sec Variable resistor for motor speed adjustment Motor control PWB unit Spindle pulley Note In mounting the DC motor the distance between spindle pulley and motor pulley should be kept to be 73 0 4 mm as shown above 2 Replacement 1 Remove PWB unit Refer to page 14 2 Put off the belt Refer to page 13 3 Cut off the tie band for fixing lead wires of motor and motor control PWB unit Be careful not to damage lead wires 4 Remove 3 lead wires coming from the motor control PWB unit to connector J3 from the hous ing of connector J3 5 Remove 2 motor control PWB unit fixing screws 3mm and 2 DC motor fixing screws 3 mm Detach the DC motor and motor control PWB unit from the main frame 6 For assembly take the reverse order 7 Carry out inspection referring to description at left Motor control PWB unit fixing screw Lead wire Motor cable tie Motor pulley 3 Adjustment 1 After the completion of the above check items adjust the variable resistor of motor control PWB unit so that the stroboplate appears to be com pletely stationary 18 W Start of disk system MZ 80IO MZ 80F D FDK
16. time To prevent such a draw back this mechanism has been adopted so that the front door connot be closed if the diskette is improperly in 3 Interface 1 Interface signal All lines are of TTL transistor transistor logic 1 Input signals For input signals there are 10 kinds of input lines all of which are valid at low levels These signal lines are terminated at a 150 ohm integrated resistor fitted in the IC socket of drive 1 The signal voltage levels are as follows High level Invalid Valid 0 4 resistor Drive select signals 0 to 3 The MZ 80FD has 2 drive units By adding the MZ 80FDK up to 4 drive units are available These signals are used to select a desired one of the four drive units At low levels of drive select signal R W head is loaded to cause the operation indicator to light up Note Depending on which drive unit to use Drive No 1 thru 4 it is necessary to process short pins of the control PWB See page 14 2 Motor ON signal The drive motor starts when the signal level be comes low This signal level becomes high about 2 seconds after completion of all operations if no operation is commanded next thus inter rupts the motor extending the service life of motor 3 Direction select signal The signal is given to designate the shifting direction of R W head when the step pulse is input High level Out direction to diskette outer portion Low level
17. 004 22 TSPCEO006PAZZ Specification panel TSPCEO005PAZZ TSPCE0007PAZZ for U K for U K Chassis indicated OUT indicated signal flat cable to be connected herewith LCHSM0090PASA LCHSM0092PASA 5 Flat cable assembly 34 pin socket 1 pc 34 pin socket 2 pcs socket with flat cable connection lead DSOCNOO40PAZZ DSOCNOO56PAZZ m _ Disk drive PWB termina Refer to setting of short pins and terminal resistor and short pin resistor on page 14 K labels four sides Packing case indication of the case TLABEODO2PAZZ 5 Wire length 900 mm DTiP 0039PAZZ Wire length 500 mm DTiP 0042PAZZ Braided wire Below are shown the floppy disk system block diagrams When using MZ 80FD only MZ 80FD C MZ 80FIO 1 O card MZ 80IO I MZ 80F15 DRIVE 2 DRIVE 1 RAM required to extend Without With to more than 36K bytes terminal terminal resistor resistor Power 2v 12V LL 3037 em J a When using both MZ 80FD and MZ 80FDK MZ 80F05 MZ 80FDK MZ 80FD MZ 80FIO 1 O card 2 8010 MZ 80F15 DRIVE 4 DRIVE DRIVE 2 DRIVE1 RAM im Without Without Without With t
18. 4 LHLDFOO15PAZZ 35 LHLDWOO06PAZZ 36 LHLDW9003CEZZ 37 LBNDC0003PAZZ 38 PCUS GOOO5PAZZ K0050 LX BZ0067PAFN LX BZ0068PAFN TSPCE0004P TLABE0001PAZZ TLABE0002PAZZ TiNSE0007PAZZ JPAZZ Specification LABHODO2PAZZ Label for Cabinet Front Frame Chassis for MZ 80FD Chasis for MZ 80F DK Foot Drive Number Lavel DRIVE 1 for MZ 80FD Drive Number Label DRIVE 2 for MZ 80FD Drive Number Label DRIVE 3 for MZ 80FDK Drive Number Label DRIVE 4 for MZ 80F DK Drive Fixing Angle Front Frame Fixing Angle Flat Cable Ass y Fixing Angle Flat Cable Ass y for MZ 80F D Flat Cable Ass y for MZ 80FDK Ground Terminal Braided Wire for MZ 80FD Braided Wire for MZ BOFDK Filter PWB Fixing Holder Flat Cable Fixer Cord Fixer HW 146 Wire Band Cushion 5 x 100 x t1 0 C Col Screw for Disk Drive Screw for Disk Drive Fixing Angle Instruction Manual for MZ BOFD Caution Label Label for MZ 80FDK MODEL MZ 80FIO CARD UNIT SECTION INTEGRATED CIRCUIT A RH iX0074PAZZ m RH iX0077PAZZ ICA RH iX0078PAZZ IC5 RH iX0071PAZZ IC6 RH iX0215PAZZ IC7 RH iX0219PAZZ SN74LSO4N SN74LS30N SN74LS32N 5 741502 5 7415174 ROM SN74S474N RH iX0238PAZZ 417 CODE BY BF AR BH BH AB AB AB AB AB AE AM AE BP BU AH AS AS AC AD AA AB AA AG AH
19. CNOO65PAZZ 620050 22 PRDAROO21PAZZ PRDAROO22PAZZ LANGKO270PAZZ LANGQOO022PAZZ LANGQOO23PAZZ PSPAKOO05VAZZ DISK DRIVE RMEMROO01PAZZ 95AF140622 01 95AF120138 01 95AF140630 01 95AF120151 01 95AF140640 01 DESCRIPTION 0 018MFD 50V Film 3 300MFD 16V Aluminum 0 001MFD 50V Film 10MFD 35V Tantalum 0 0068MFD 50V Film 0 0033MFD 50V Film 3 300MFD 10V Aluminum COILS AND TRANSFORMER Coil Coil Fuse Holder Lead Wire with 4 Pin Connector Lead Wire with 2 Pin Connector 2 Pin Plug Radiation Plate Radiation Plate Switch Inlet Filter P W B Fixing Angle PWB Fixing Angle PWB Fixing Angle LED Specer UNIT SECTION Assembled Disk Drive Unit Not replacement item Belt PWB Unit Ass y index Lamp Ass y Medium Guide L Ass y with Write Protect Sensor Lamp Operation indicator CODE AB AG AB AE AA AB AF AQ AM AA AE AC AT AD AF AD AE AA BA BL BN AZ PARTS LIST DESCRIPTION Drive Motor Ass y with Motor Control PWB OTHER SECTION REF NO PART NO 18 95 130246 01 19 GCABA8121PASA 20 21 LCHSMOO90PASA 22 LCHSMO092PASA 23 GLEGROOO1PAZZ 24 TLABZ0029PAZZ 25 TLABZOO33PAZZ 26 TLABZ0034PAZZ 27 TLABZOO35PAZZ P 28 LANGFOO17PAZZ 29 LANGFO0023PAZZ 30 LANGKO269PAZZ 31 DSOCNOO40PAZZ 32 DSOCNOO46PAZZ 33 QTANNOOO2PAZZ DTiP 0039PAZZ DTiP 0042PAZZ 3
20. D 1 Power Supply Circuit AS O 0188 40 7 4 Zoga ioga 756895 221 21 l 2689 loto 66595 191 21 1 AGE lObtu 80p 32v 91 2092 60002 1071 QU ASEO 2062 1052 9 10082 9022 1022 1110912 AlddNS HOMOd FORSE 0002 V 1 6200d 1011 lolos 7 zH OS 9601 AOvc OV 10 zH 08 01 AOcc OV 33 m Printed Wiring Board Power Supply Section 3sna 1013 vuoos1 Primary FO294PA Secondary Vcc REF OUT REFERENCE REGULATOR 12 COLLECTOR 1 11 EMITTER 1 13 COLLECTOR 2 14 EMITTER2 REFERENCE REGULATOR OSC OUTPUT INVERT INPUT NON INV INPUT OSCILLATOR ERROR 9 AMPLIFIER COMPENSATION CURRENT LIMIT CURRENT LIMIT Resistor values shown are nominal 34 04 for MZ 80F D for MZ 80FOK Em 05 for MZ 80F D 27 for MZ 80F DK AUS tor MZ 80FD 82 for MZ 80F DK 38 38 91 for MZ 80F D 45 for 2 35 a Power Supply LED PWB Spindle pulley 13 Motor pulley s Disk drive 1 36
21. Disk drive 2 ar ET 4 al af Se ras Kk w k m DL saf CS se 7 Main Frame Carrier M We Front door Front bezel Floppy Disk MZ 80FD MZ 80FDK Braided wire DTiP 0039PAZZ for MZ BOFD DTiP 0042PAZZ for MZ BOFDK 7 Sack 55 22 22 55 22 e c gt Packing Add front 26 22 TLBHOOO2PAZZ for U K A C cord QACCKOO050AFZZ QACCBOO01PAZZ Packing Add rear Instruction manuat SPAKA0027PAZZ Packing Add SPAKA0028PAZ2 Packing Case SPAKCOO95PAZZ Label for MZ 80FDK 002 22 Mouthpiece Caution label TLABEOO01PAZZ Floppy disk 1 card MZ 80FIO Protected Seat SPAKPO002PAZZ PWB Sleeve SPAKS0028PAZZ Packing Case SPAKC0087PAZZ Seal x 2 TSELFOO01PAZZ 39 REPLACEMENT PARTS LIST To have your orde NOTES Be sure to use regular parts for securing the safety and reliability of the set Parts marked with A and parts cross hatched in black are especially important for maintaining the safety and protecting ability of the set Be sure to replace them with parts of specified part number MODEL MZ 80FD MZ 80FDK REF
22. IPPLE OUTPUTS Veo OD T ou 615413211 XLI CLEAR LOADD AUG ENABLE Ltt IL UN usa shel Re C CLEAR CLOCK A SS ve DATA INPUTS FUNCTION TABLE OUTPUTS 92 20 c o o rrrrrr lrrrrrirriirrij rrrrri rrrr cese E XIII H high level a Disk drive PWB circuit 1 031 lt gt M GION3 10S QVO1 Er 1 52 Ajddns 4 2 134 AS AS C AS VAS bey 138 2 1 WH ot E zin 123138 30100 9 sH yi 26217 123135 3015 i D 1 7 SS6SI 182 i 9ru3 D 66651 Zp weer 242 oul rai VAS NO
23. cket and A 11 black lead of the 11th pin from power socket both belonging to connector J3 Carrier Note When attaching the index lamp assembly to the carrier fit the housing and LED in at the same time S LT X 2 Replacement D Remove PWB unit refer to page 14 0 Disconnect 2 lead wires of index lamp assembly from the housing of connector J3 Cut off the tie band fixing lead wires of index lamp assembly be careful not to damage lead wires and open the front door Take lead wires off the guide groove of carrier and draw out the index lamp assembly with tweezers and fingers To attach take the reverse order 6 Carry out inspection referring to description at left Index lamp assembly Guide groove Lead wire Index lamp cable tie Lead wire LED Housing Carrier 5 Media guide L assembly with write protect sensor lamp 1 Inspection 2 Replacement Connect power socket to connector J2 of PWB Remove PWB unit refer to page 14 unit Turn power on 2 Open the front door Q Before inserting a diskette check the following 3 Detach 4 lead wires of media guide L assembly items from the housing of connector J3 a Write protect lamp 4 Remove 2 media guide L assembly fixing screws Make sure that there is a voltage range of DC 1 3 mm and take out the assembly to 1 7V between B 13 lower yellow lead of the 5 To attach take the reverse o
24. improperly fit in or broken No select signal comes at drive Drive unit door front door is not closed Diskette is faulty Write operation is attempted in write protect state OO OOOOCO O Fit diskette in correctly O Check belt and or drive motor assembly O Check index lamp drive PWB index sensor O Check flat cable Check floppy disk 1 card O Close front door O Replace diskette Floppy disk 1 card is faulty Oscillation circuit is interrupted VFO circuit is abnormal LSI T3444M CRDY signal is not given LSI is not released Pattern is broken or bridged Conductive foreign matters are sticking to IC etc O PWB and connector are in inadequate contact 2 Check IC13 Check 15 and 1 16 See page 7 No CLOCK signal comes at 151 Replace LSI O Check pattern O Check IC 3 Interface unit is faulty 1 Drive O Head position is not aligned off track state O Head and amp circuit are defective 2 Diskette O Diskette not formatted is in use O CRC error in ID field ID field is broken down Refer to Service Manual for MZ 80 IO O Replace drive unit O Replace drive unit and or drive PWB unit Initialize again or replace diskette 3 Floppy disk I O card is faulty O LSI T3444M is improper O VFO circuit is defective 1 Drive O SEEK error O Head shift is improper Replace LSI Check
25. is fed from the power supply unit to the J2 connector of drive control PWB lt _ 1008 MN 2 _ _ PR Pus MIN SS 1 Removal of disk drive units 1 Remove 6 case set screws 3 mm at the bottom of the set and detach the cabinet Screws A in below chart 2 Remove 4 disk drive fixing screws LX BZ0067PAFN at the button of the set Screws B in below chart 3 Draw 2 power sockets and 2 signal cable sockets off the disk drive units Pull the 2 disk drive units toward the front frame 4 Remove 8 oval screws LX BZ0068PAFN of drive support plate coupling the 2 disk drive units Screws C in Disassembled View on page 35 13 2 Belt 1 Inspection Check to see if the belt is stained with dust or dirt Also make sure that there is no unevenness scratch and thinned part 2 Replacement 1 Take the belt off the spindle pulley while rotating the pulley gradually by hand 2 For applying the belt put the belt first on the motor pulley and then on the spindle pulley while rotating the spindle pulley Note 1 In putting on and off the belt be careful so that it be not caught by the motor pulley flange 2 Note that there is no difference between both sides of a new belt Motor pulley Keep belt off the flange 3 PWB unit 1 Replacement 1 Take connectors J3 and J4 off PWB 2 Remove 4 PWB unit fixing screws 3 mm 3 Detach PWB unit
26. o more than ytes terminal terminal terminal terminal resistor resistor resistor resistor Power 2 Power 2d supply 12V supply 12V Up to 4 units of drive can be connected as shown above using daisy chain The signal line terminal resistor is applied only the last drive unit of the daisy chain Usage of two or more terminal resistors causes damage to C s When 4 drive units are being connected they should be all in operating mode to ensure proper function Daisy chain Connection method to control two or more drive units In this system more than two connectors each of which is coupled with each drive unit are connected with cables 1 2 1 Transfer control Block diagram Interface with bus line Port address decode Bus driver Latch Buffer Floppy control P circuit Drive ready detection circuit LSI T3444M VFO circuit oscillation circuit Address decode Bootstrap ROM For port addresses SF8 F9 FA and used For ROM addresses 5 000 to F3FF are used Explanation on LSI T3444M Block diagram Track address Sequency DRDY WPR TRZ TND control X RAM 8 x 8 bits SYN WTG HDL READ DATA STP DRC SDS WRITE DATA WINDOW INDEX Immediate data 2 INITIALIZE
27. ocket and J 3 A10 upper black lead of the 10th pin from power socekt will be DC 1 to 2V when the lamp is lit 2 Replacement Remove PWB unit refer to page 14 Q Datach 2 lead wires of operation indicator from the housing of connector J3 and take lead wires out of the wire holder 3 Open the front door 4 Remove 2 front bezel fixing screws 3 mm and the front bezel itself by pulling it forward 5 Draw out the holder 2 with tweezers in the arrow direction Take out LED holder See the sketch at right 6 Draw LED out of the LED holder To assemble take the reverse order Carry out inspection referring to the above instruction Main frame side Front bezel Front door Front bezel LED holder Pull out direction E Pull out direction Note 1 Attach the front bezel assembly by pushing it to main frame side and main frame stopper See the sketch below 2 Do not pull up the carrier with fingers otherwise excessive force is applied to the head arm Main frame stopper Main frame side Front bezel fixing screw 17 7 Drive motor assembly DC motor and motor control unit 1 Inspection 1 Connect power socket to connector J2 of PWB unit Turn power on 2 Led interface motor ON signals be at low levels make a short between J1 16 terminal of PWB unit and PWB Ground and run the motor Do not prolong this test 3 Put a diskette in place
28. ons for drive ready a Diskette is inserted in proper direction b Motor runs normally 300 rpm c Index detection circuit functions normally d Front door is closed e Select signals are transmitted to drive f Specified power is supplied to drive g Drive select signals are generated normally These signals consist of SE S1 and SO S1 and SO invalid non select mode Drive 1 selected Drive 2 selected Drive 3 selected Drive 4 selected SN74LS122 INDEX When the above conditions a thru f have been all satisfied index pulses are transmitted at intervals of 200ms When SE signal becomes 1 the retrigger one shot IC SN74LS122 will be activated to cause DRD Y signal by input signal Floppy control LSI T3444M is given a command to operate DRDY signal is then checked before an advance ment to the next operation If DRDY signal is low error indication is displayed to interrupt the operation OPERATIONAL PRIN The floppy disk is designed to rotate the so called megnetic head in direct contact with a specified track diskette a magnetic disk storage unit to read out sector of 70 tracks formed in both surfaces of the and write in data at high speeds by bringing the diskette 1 Fundamental block diagram Read data Read circui Operation Write indicator protect AF due sensor sensor l
29. rder 13th pin from power socket and A 13 black 6 Carry out inspection referring to description at lead of the 13th pin from power socket both left belonging to connector J3 b Write protect sensor Make sure that there is a voltage range of DC O to 0 5V between B 14 orange lead below the 14th pin from power socket and A 14 black lead of the 14th pin from power socket both belonging to connector J3 3 Put a write protect diskette with write protect seal being applied at the write protect notch of diskette in place and shut the front door Then check the following item Write protect sensor Make sure that there is a voltage range of DC 2 5 to 5 25V between B 14 and A 14 of connector J3 Note 1 Attach the media guide L assembly by pushing it to main frame stopper side and front bezel side 2 Lamp and sensor cannot be individually replaced because they are built in the media guide L assembly Media guide L assembly fixing screw Write protect lamp Front bezel Main frame stopper 16 6 Operation indicator 1 inspection Connect power socket to connector J2 of PWB unit and turn power on 2 Let drive select O of interface signals be at low levels make a short between J1 8 terminal of PWB and PWB Ground and make short pin DSO circuit shorted Do not prolong this test Note that the voltage range between connector J3 B10 red lead of the 10th pin from power s
30. rolled with drive select signals This is a high precision reliable head locating mechanism using stepping motor and screw driven ball V groove system The stepping motor is of 7 5 pulse steel plate type One pulse of step signal causes a 2 step rotation by 15 thus pushing forward the head by one track 6 Write protect detection section A luminous diode and a photo transistor are used to detect write protect notch of the diskette and jacket Writing is not possible when the notch is covered with label Label area Center hole Write protect notch Head window Index hole Description of diskette parts 7 Index detection section This section consists of a luminous diode and a phototransistor An index hole of the diskette is detected by this section to determine the starting point of a track 8 Track 00 detection section A carriage position is detected with a limit switch When the carriage has reached the track 00 point track 00 signal is emitted 9 Control electronics section The electric circuit to control each mechanism is composed of 2 sheets of PWB One is to control the DC motor control circuit The other is to control other circuits say detection and other functions with respect to read write step head load and other signals 10 Diskette protect mechanism Shutting the front door with the diskette incom pletely set in can give damage to the diskette thus shortening its life
31. rrors 1 2 3 4 5 6 7 8 Drive READY signal does not become high No master diskette used or faulty master diskette I O unit is not power suppy on MZ 80F IO does not normally operate Signal cable is not correctly connected or damaged cable RAM has not been extended RAM should be loaded with more than 36K bytes Improper ROM or faulty circuits adjacent to ROM Others 4 Timing chart of VFO Variable Frequency Oscillator circuit WINDOW ERN READ DATA CK SN74LS161 B CD 5 1 When synchronizing signal is high VFO circuit is asynchronous 2MHz Qc 1MHz 1 00 gt l 500ns A A ax see B i 1 25us WINDOW 1 005 gt o e 2220S 2 When synchronizing signal is low VFO circuit is synchronous Read data is phase synchronized with 8 MHz clock The counter SN74LS161 is initialized by means of the signal and window nand operation Namely timing of read data window and clock is adjusted as follows READ DATA L L READ DATA About 105 WINDOW Fa 1 5 CLOCK About 1 5us 1 25us 5 Ready detection circuit of selected drive units DRDY DRIVE READY INDEX Index signals when continuously coming at inter vals of 200 enable DRDY drive ready to be kept high Conditi
32. st track In any position other than track OO the signal is at high levels When the R W head is at track 00 the head is held at the position by the stopper even if another signal to step outside is given At this time however the track OO signal level becomes high By adding still another signal to step outside the motor phase is returned to cause track OO signal to become low 3 Write protect signal This signal is used to detect whether or not write protect for the diskette is provided When diskette with write protect is in the signal level becomes low In usual operation a diskette with write protect enables to protect write statement within the drive 4 Read data signal The signal is given to transfer data read from the diskette Usually it is at high levels while during detection it comes down to low levels o4 3 Timing DC POWER MOTOR ON 100ms MIN DRIVE SELECT VALID TRKOO 500 1000us MIN AND WRT PRT Hs OUTPUT Max VALID INDEX s00ns MAX DIRECTION SELECT STEP 1 uSMIN SIDE ONE SELECT 35ms MIN 100048MIN us WRITE 100us MIN 4 8us WRITE a DATA gu t 100 MIN 35ms 1000sMIN 100us MIN VALID READ ac VALID VALID DATA 50ms MIN 1sec MIN VALID Control and data timing 2 Power supply unit interface Specified supply voltage of DC 5V DC 12V
33. t I 2 P lt a Head load Write protect Ne oa Write circuit q 4 Drive Index lamp G Drive Head load select P x Track 00 Wa switch Motor ON Diskette B Drive H e ead select select Write data Write gate Write protect Head select Step Direction Index Track 00 Drive select Head select Motor ON Read write head V Control circuit Stepping motor Motor control circuit 2 Mechanism explanation This device consists mainly of the following mechanisms 1 Read write head 4 Diskette driving mechanism The head is attached to the arm through a leaf A small sized DC motor with tacho generator is spring The head can follow the motion of employed The motor rotation is transmitted diskette easily through the drive belt spindle pulley and spindle Signals read out of the head are transmitted hub thereby causing rotation of the diskette This through FPC Flexible Printed Cable to the read spindle pulley is provided with a stroboscope to amp circuit check rotation interval 2 Carriage assembly 5 Head load mechanism 2 units of read write head are mounted on the To extend the life time of diskette and head the carriage The carriage is located with the stepping head can be brought into contact with the diskette motor and lead screw only when in operation This mechanism is con 3 Head locating mechanism t
34. te head 4 Shifting the head control of direction gap between and number of steps 5 Generating drive ready signal 6 Detecting write protect and track O 7 Separating read clock from drive into clock bit and data bit 8 Collating and retrieving disk address data 9 Generating and checking CRC Cyclic Redandancy Check 10 Generating sampling window pulse of read data in VFO Variable Frequency Oscillator circuit 11 Serial and parallel conversion of read write data 2 Bootstrap function Selecting a drive for ROM SN74S474 or equiva lent reading 14 sectors from the beginning of track 0 at the diskette being set in the drive and finally loading the 14 sectors in RAM address 9800 The program loaded will be checked and jumped into 9800 At that time errors if detected will be displayed as CAN T BOOT in the CRT display The set is then on monitor com mand wait Reference ROM SN74S474 or equivalent SN74S474 425 825141 417 825181 512 bytes RH iX0238PAZZ 1024 bytes In applying the above ROM jumper wire of PWB pattern is put in between pin 21 and pin 22 of ROM for short circuit purpose in the course of production Note The 512 byte ROM can be either short circuited or not during use The 1024 byte ROM in use must be short circuited Cyclic Redandancy Check A check carried out on read out data to detect errors Types of e
35. tepping head k _ 3 state output stp Output Step pulse ROM Output Signal 89 request transferring HDL Output Head load read write data WTG Output Write gate IN OUT Input Input output designation signal to P get access to tach register of SYN Output Command signal to indicate command status track and whether or not clock is to be synchronized with read 4 T SET Input Select signal to get access to track TND Input Command signal to indicate register whether or not data is to be read SES Ti Select nal i i and or written through consecu nput ec signa O get access to tive sectors sector register 7 TRZ Input Track zero R T Input Input output designation signal L to get access to read write data WPR 1 Input Write protect register DRDY Input Drive ready PRM Input Select signal to get access to read WRITE write data register DATA Output Write data GND Power ov CRDY Output Signal to show if controller is READ ready or not Input Read data pulse is input Nes DATA INDEX Input Index hole WINDOW Input Strobing pulse when reading out SEM Input Select signal to get access to read data d command status register CLOCK Input Fundamental clock to cause opera vcc Power 5V tion L 3 Function of MZ 80F IO 1 Control of 4 drive units max 1 Starting and stopping the motor 2 Selecting drive unit 3 Loading and Unloading the read wri
36. ter rectification and F201 Does waveform of the chart appear in collector of Q301 Check D201 short circuit after rectification Check and its peripheral parts Check output switching No Yes circuit Leave R301 be open does there appear 0 3Vp p pulse at pin No 12 of IC1 Check L301 and Yes C304 C306 N Check IC2 and its peripheral parts o A Check output Yes switching circuit Leave R401 be open does there appear 0 3 Vp p pulse at pin No 12 of IC2 Yes and F201 Does waveform of the chart appear in collector of Q401 Check L402 C404 Yes and C408 Note The circuit diagram and printed wiring board subject to change without prior notice i 24 452 SIDE SELECT LTTE lt leiel gt d gt Roe gt 3j 4 CI LSO4 ABIS gt al 54 a 15161 ABO TE em LSO4 087 1504 A C O 2 7 6 s POE S SE r 3 5 IK 004 ABS c 082 ABs DB AB AB2 DBO GND 23 Printed Wiring Board Floppy disk 1 Card Section e aie we els
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