Sharp MZ-80SFD, Service Manual

Page 1: ...D FEATURES High speed reading and writing of data and programs Easy deletion and addition of programs Simultaneous reading and execution of program by RUN command Linking programs by CHAIN SWAP command Expanding up to four drives by one I O card SHARP CORPORATION ...

Page 2: ...y 1 Operational principle of floppy disk 2 Inspection and replacement of disk drive main parts 6 Trouble shooting guide 11 Power supply section 13 Circuit diagram and printed wiring board 15 Packing method 20 Disassembled views 21 Replacement parts list 23 ...

Page 3: ...mensions Approx 165 W x 102 H x 323 D mm Weight 4 kg II r PE qlf1t iiO I General specification 1 Power supply section specifications Item Specification Input AC 220V 10 50Hz AC 240V 10 50Hz Output DC 12V DC5V Specifications and design subject to change with out prior notice for product improvement In such cases items mentioned above may be partially different from the product CONSTITUTION OF SINGL...

Page 4: ... is attached to the arm through a leaf spring The head can follow the motion of diskette easily Signals read out of the head are transmitted through FPC Flexible Printed Cable to the read amp circuit 2 Carriage assembly 2 units of read write head are mounted on the carriage The carriage is located with the stepping motor and lead screw 3 Head locating mechanism This is a high precision reliable he...

Page 5: ...it 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 time To prevent such a draw back this mechanism has been adopted so that the front door connot be closed if the di...

Page 6: ... 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 Track 00 signal The low level state of this signal signifies that the RIW head is located at track 00 position the outermost trackJ In any position other than track DO the signal is at high levels When the RIW head is at track 00 the head is held at th...

Page 7: ...Ls MAX II d if 100J Ls MIN 100J Ls MIN I 1 3Sms MIN 1000tlSMIN I VALID 1 I VALID 50ms MIN VALID 1sec MIN VALID READ DATA WRITE DATA WRITE GATE SIDE ONE SELECT STEP DRIVE SELECT VALID INDEX DIRECTIO SELECT DC POWER MOTOR ON VALID TR AND WRT OUTPUT Control and data timing 2 Power supply unit interface Specified supply voltage of DC SV DC 12V is fed from the power supply unit to the J2 connector of d...

Page 8: ... between both sides of a new belt 2 PWB unit 1 Replacement 1 Take connectors J3 and J4 off PWB 2 Remove 3 PWB unit fixing screws 3 mm 3 Detach PWB unit 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 ...

Page 9: ... assembly to the carrier fit the housing and LED in at the same time 7 2 Replacement CD Remove PWB unit refer to page 6 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 as...

Page 10: ...e 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 8 14 and A 14 of connector J3 2 Replacement CD Remove PWB unit refer to page 6 Open the front door Detach 4 lead wires of media guide L assembly from the housing of connector J3 Rem...

Page 11: ...r from the housing of connector J3 and take lead wires out of the wire holder CID Open the front door Remove 2 front bezel fixing screws 3 mm and the front bezel itself by pulling it forward Draw out the holder 2 with tweezers in the arrow direction Take out LED holder See the sketch at right Draw LED out of the LED holder To assemble take the reverse order j Carry out inspection referring to the ...

Page 12: ...dl tl bet veon pl I pull y and mOtor pulley hould be kept to be 73 iOA mm III Iwn abo _10_ 21 Rtplocemonl D R PWB il CR to pogo 6 1 2 Put off 1M bfoIl lR I 10 _ 6 1 p Cu olf tIM iI bind I fi Iud wi of t _ mol eont fIWB unit lk _ lui nol to d lead A _ 3 Iud ir t tM motor on1r01 P W u 10 conntlC Of JJ_lrom 1M I ooJs ing of oct J3 tID R m 2 met tontrol PWB Unil fixing ocrew 13 mml ar d 2 DC motor fix...

Page 13: ...ror 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 2 Interface unit or expansion port 3 I O card 4 Diskette 5 Signal cable 6 Disk drive The signal circuits of floppy disk and I O card operate at TTL levels of OV 5V Connect any system other than micro computer peripheral devi...

Page 14: ...e front door closed a Diskette is faulty a Replace diskette a Write operation is attempted in write protect state 54 1 Drive UNFORMAT a Head position is not aligned a Replace drive unit off track state a Head and amp circuit are defective a Replace drive unit and or drive PWB unit 2 Diskette a Diskette not formatted is in use o Initialize again or replace diskette a CRC error in 10 field a 10 fiel...

Page 15: ...ircuit Circuit t F Control Circuit 1 G Transistor 5 Rectifying and Chopping Somoothing Circuit Circuit Control Circuit 1 Waveform of Each Part Waveform of pin of IC201 and pin 5 of IC301 Waveform of pin j of IC201 Q202 collector waveform I22V 22 s i 40 s 22V 24 s 4 j s Waveform of pin j of IC301 0302 collector waveform 15V 15 s 40 s 13 ...

Page 16: ...ar f Check n01 Check 0201 1Vp p pulse at pin No 11 of IC201 I V Is there DC 20V present across C2027 Does waveform of the V chart appear in V collector of Q2027 Check L201 and C205 C209 Problem 4 5V is not developed No Check IC301 and its peripheral parts r Is there AC 14V present across the Check output yellow lead of T101 7 Yes switching circuit Leave R303 be open n No does there appear f Check ...

Page 17: ...0 00 1 11M V I Iti0S I Tte M04 0101 DIOS RI I RIDS IIt 00412 O AI2W 2 Zte CIOe 4 IS V II IS 14 I 12 10 IC201 I TL494CN 2 I r I T a O l OJ ao 1tlO 4 1IC MO 4 1IC 2 te e201 l Ck RZIO n RIll 0 0 5OV I IIC SK 0301 A770Y csot VR20 O OI IOV C I d JO 10 D 00 zoom I OJ IOOV 010 0302 I I l IIV8IO f I CIOS r I 1_ C102 t 125V I OOOJI 2SV CS04 eS05 cs 0 0 00 110 V UOO II IV 001 tiel V ItSOS 2 11C _ J DIGI Dio...

Page 18: ...A B c o E F G H 1 2 3 4 5 6 Power Supply PWB Primary 7 8 9 10 11 Secondary 16 F0410PA ...

Page 19: ...I DRIVE J3 A 2 i5 i LSI Il J S 51 1r 1m 6 7 5 t P R _ ______ 3 v r 4 F i F J3 62 0 MOTOR 10 3 11 10 3C 8 TOO i A23 LS123 L C W P I l 2 i2 JfI I 0 R1S 9 lSOo 820 10 c 2 EJ 2 9q 8 r U2 AJ I I J 2 8 WRITE TRACK 00 I 680 All lS14 j l r rl 399 1_ ____i ____i r I R D V I____i _ __ _ IDS 13 38 r I PROTECT SWITCH J3 A9 680 r 1 505 NO tu C O 0 rs 3C 6 l C26 J l 11 C25 5 61 T 5V SVT c c J3 Bl0 A J3 A8 r __ ...

Page 20: ...A B c D E F G H 1 Disk Drive PWB Reference diagram i I Il J4 c C C T 77 4 _ to C o t 1 i C i f I f 1i J I ti it 1 1 i l l 2 3 4 5 6 7 B 9 10 Penpective View IParts fitted face c JOpposite side 11 19 ...

Page 21: ... K SESA Packing Case SPAKC0212PAZZ l lnstruction Manual English TiNSE0040PAZZ Instruction Manual Sack SSAKH0021PAZZ Packing Add SPAKA0078PAZZ Drive Number Label TLABZOO29PAZZ 8 TLABZ0033PAZZ B TLABZ0034PAZZ Sack TLABZOO35PAZr I SSAKH0013PAZZ Terminal Resistor J RR KZ0056PAZZ Packing Add SPAKAOO79PAZZ Packing Add SPAKA0035PAZZ 20 ...

Page 22: ...VBlO 1 S2VS10 AG C308 0301 C302 VCEAAU1EM108M l OOOMFO 25V Aluminum 0202 1 C303 AD 0203 VHOERB81 004 ERB81 004 AG C305 VCEAAUOJM338M 3 300MFO 6 3V Aluminum AF 0302 or VHORK14 1l C309 VCOYKU1HM103K O OlMFO 50V Film 0303 C310 AB RESISTORS TRANSFORMER AND COILS R201 VRO RU2EE101J 100 ohm 1 4W AA T101 RTRNP0069PAZl Power Supply Transformer BK R301 for 220V 240VJ R202 1 llOl RTRNZOOO51 AlZ Line COil AL...

Page 23: ... I 11 8 _ _ I tli N _ _ _ _ CD n lp o c 1 o I LJ I f _ _ _ _ _ _ _ _ _ _ _ _ J I en o W J m i w m t en o u o w lD N LO en 21 22 ...

Page 24: ...ht Frame Left Frame Ground Terminal Screw Drive Fixing Screw Screw Round head Flat foot Screw Screw Socket Fixing Screw Washer for FG Terminal AC Cord for SE f AC Corif for SU l 14C C 1W UK Speclfteatlon tf Ji220V sPeciflc ation Panet for V Instruction Manual English Braided Wire Drive Number Label DRIVE 1 Drive Number Label DRIVE 2 Drive Number Label DRIVE 3 Drive Number Label DRIVE 4 PART NO OTH...