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Hitachi MP-1802 Technical Manual

Hitachi MP-1802 Manual Online:

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Hitachi MP-1802 User Manual
Hitachi MP-1802 User Guide
Hitachi MP-1802 Online Manual

Text of Hitachi MP-1802 User Guide:

  • Hitachi MP-1802, /n. Positioning Mechanism The 4-phase stepping motor rotates 1 The rotation novement of the spiral to straight movement of the carriage s et at the de s ignated pos it j- on . 5 degrees per step. wheel is converted and the head is 6 guide bar ide I head Fig . 7 .16 Positioning Mechanism 5 . Head L oad Me chan j_sm By acti-vating the head load s olenoid, the pad load, side t head arm moves and the pad Side t head presses the disk. When the solenoid is not activated, the spring separates the pad

  • Hitachi MP-1802, ')tr 0utput S ignal s 1 . READY When the inserted disk rotation speed becomes more than 60i[ of the rated 300rpm and if the index pulse j-s detected more than two times, READY = rflrr. z. Tffi-o'O When the read,/write head. is at Track 00 position, TRACK 00 = rrLfro 3. TNIffi When the inserted disk starts rotation and detects the index hole, TTnffi = tf -1-1- rr (low pulse). L. READ DATA To correspond with the magnetic flux inversion on the - disk, EETD-ffiT = t'

  • Hitachi MP-1802, (wote ) Pulse width tnw is as shown below Input 250 KHz square wave Fig . 8.3 Circuit Diagram signal (ffi, level) read and TPG2. between the R1 25 @sigt Rt37 Rt36 ... /63 ( no not connect DC fan, MDD' Drive 0,1 )

  • Hitachi MP-1802, T7R]TE PRBT. t/e E NABII- R:q IK t9 H?18'} (esfi) R3E r.'l9r t/. c:S 0.ot9/ Rt6 ||:r r14 3+,8ts tYq T 3.T4:zgA agr T{-T Dro I lsza'150 ; F'-- 'ry d #.^-t | 1g.tv ) lA '.\ 1B', *r,\Yfrn 1 l+ t5 'z=l ERASE AN DELAT rr f>+.13 .*, - ,, Frb + c)\* 3 trfr:| 7h I V P I IB -0 R50 IK .=t1\fr. Ae'qE o-otiT 4 TJ I:+ A e IB T5 :Srrtd)TH-Y R8q t+.lE l% 86 R ; I c:+. 5607 R5'l IK 5 ERAse a'FF0ELAY 'zz I R61 z5x R+f ro0 c-:,:filop t+t2 t3'l b l'A Ft L >r+rt 0 2JE gl) ?6'I rEo zW.z'i REAI tir.1-A c2t

  • Hitachi MP-1802, genel'ates the standard timing signal ( s"parate clock signal, D-RCLK signal)) to separate the data bit and clock bit from the READ DATA signal of double density recordirg mode (ttl,tt recording) ' Also the separate data slgnal (D-READ DATA signal) i s generated by re s t oring the wavef orm . The phase detection consists of 1C113, IC115,1C117, IC112, rc11 /+ and I ci 20 . rc1 zo , q1 oz, c1 27 and R1 3 /,, make up the filter amp and lc1 1 g makes the voltage control- generator (voltage control frequency 330 KHz 660 KHz) . The wave restoration eircuit consis

  • Pin No. S ignal Data Direction Level-3<--.+lnside Explanation 1B 1g 20 21 22 23 2/+ 25 26 DOUBLE DEN _-....-- Becomes fH I with writing and recording of double dens ity 27 GND GROUND 2B 1 2g 30 31 32 33 3L 35 36 37 3B 39 /+0 l+1 l+2 lr3 /, lr , . . /12

  • Hitachi MP-1802, /a I v ( 3o=' a\ r\1- | !tD6 L-,3{sE3ozA 't|+\i\r. z&q),JT{JY I + I t- I I I l- I ePE N .WRITE TN HIBIT R:'i tPr R8l ?'l E.2K t/e E NABI-E- r-l---.- -.. r,4r ?R0. ]MTTE 'ATA T*# Siut, O }1 EAD ,lrilc 1 HEA' Ju=^rr rt*,.- t Rrq IK RrB Z.:3 D8 H?qA-2 I E (8.tv ) 13,141?gA 0g: T{-T Dro I lSzalSO R30 560 r9 H?18:I (osfi) R35 l.'J9 r t/. cf,5 o.ot97 R5+ 3+,8r lYq R?5 +lF t5 IB 6 i=l H:4{-) c+.lr) Qt: 8.4'l ERASE rl J1 @23 t50 15t R86 Itll'

  • Hitachi MP-1802, '). MP-1802 Basie Frinction Check + 5 \/'2 YES What is 6tl collecto- YES Check MP-3550 connectors Short cut . n/ t t r_n I 04 I s q6/, base nl f q -o vr vq6 v OV? YES Check Lev eI-3 expansion terminals oIL a g9) 5V? YES s ignal , and IC625 16 MCLK signal n ormal ? YES NO e"--J . / 73 n orrnal- ? I s Q6/,3 1 ctor voltai What i a/ t t Q.6/r/, coll-ector_ _v ol Lage] Q6L/r failure s q6 /r2 ollector volta q6 /r2 failure Check Lev eI-3 expansion terminal To page 71

  • Hitachi MP-1802, | ?ti j l3t'tR T t t T \ ,7 ctt + FU4 tot o,rr+ pr+,ft5 I B.L.H&-itrF. cg FJ T. Jjt*'.D c;g + {'cr't a.ot/',+ ?+, 6.Bp lSro'fS @) A TR.AC F C i) zsc t3 rlR 5D SfrA iozr( \l?.l STEPPER M 9T9R -t s. I I E'Ll3i' -&- + r-3 t + 'Q, -.",p^ I r3 + -i3. 'r:,:r A. Rll Its looK Tl+

  • Hitachi MP-1802, Note: 1. When DRQ = rrLff , this shows there is a data request. 'x'means not used. IRQ = trlrf indicates there is an interrupt request. 2. .l )t = [ ttttt , t,,r,, , lis {:::::: 'l [-the J 7. selected. when MOTOR '1rr Ittnt' 0N =.1 L ilLtt MDD drive motor t, { activat"u.l I stopped. I o /n. When NMI MASK = 'rHlr, FDC IRQ (f CO1 8@ pin) output is nasked. 5. When DOUBLE DEN doubl-e density record (MFM single density record (f'Pt data i s processed. """";'] Side 1 Side 0 6. When SI DE 'l = 8. Drive selecti-on is as

  • Hitachi MP-1802, Failure ./\ What is *5V output? rc200 Q2oo Q2ot Fai lure es supplement powe supply normal-? 5 irect current recti fied output suppl C]I A collecto OUT C2O5 Failure 2.5v I ES cl07 -{ lJ --\ 4 fotou ',106 I Fai lure Orrer \)'nl f:rro D107 Fai lurc: T4 C106 D106 f al lure Prote ction IClOO IC2OO t.ai lure i QlB rorm coi lect-or wclv It normaf ? YES 'I'1 I'iormal? YES What is the ctified output es supplement rectified output wave form A nor TFl R] Fail-ure C]OO B I-'i n wave form _-

  • Hitachi MP-1802, )t o 2 . Dr ive M of or Contr o1 Using the hall- effect outer rotor method DC brushless motor, the drive motor keeps the rotation speed to a uniform 300 rpm with frequency control of the frequency generator, The li-OmT-m signal controls the starting and stopping of the motor. 3 . Head L oad Driver The head load solenoid is activated when the disk is rotatingnorma11yandwhenEffi=ttLt|o(rnerotation of the disk is detected by the index detector. ) /+. Drive Lamp Itr dnT nn When S.E;L$UT i = rrLrr, READY = frLrr and HEAD LOAD = rrLr', the dr ive larnp l ight s

  • Hitachi MP-1802, 5.1 MP-1 BO2 UNI T.1 CONNECTION CONNECTOR Pin No. S ignal Data Direction Ins ide G+UNI T 1 Exol-anation I fi]il[D-ImD When rL t, head loads selected drive 2 SELECT 3 When tLt, enables sending freceiving of Drive 3 signal 3 MTffi Becomes rL I when disk r otate s normally /+ rm-ET Outputs rL I pulse when index hole is dete cted after diskfs rotation ( ffio ---.9 When tLr, enables sending freceiving of Drive 0 s ignal 6 SELECT 1 When tLt, enables sending /"uceiving of

  • Hitachi MP-1802, 2. MOTOR ON When MOftR-ON = tf L fr , the dr ive motor runs . 3. ffi When the STEP signal is input, it controls the head movement direction. When ffi = frlrr, the head moves in the INdirection(toward.Track39)andwhenffi=|'H|l' the head moves in the OUT direetion (Track 00). /r. sm When SmF = tt 1r tt (Low pulse ) the head noves one track in the direction decided by the ffi signal. 5. Tm-ftlD WhenEmm=|tL||'thehead'1oadso1enoidisactivated if mffi = rtlff o 6. STDE-T When SrDE 1 - rflfr and Side t head is selected or when . SIDE 1 = nH and Side 0 head is seLected, read/w

  • r Lra+ lx $enaBE A [,to ejo eia-: ,,irJl EPEED ffi -tl ?-2| zia-rrzft+'Y l?D I IL lr ltr0-: ".>K ..1-| I t I =fjrege i r--3 ---4<'5 /i\+ " 't+-f roD't 4 A -t 7 I + 9?,/ ?/7 HFA, I-'AD serENtJ D i .+) -:. t-'-9 ..,,/ ACT'IT lT\' I_Ef) Rrl t>o t)aeR llcv SDLENDlE (oPTrcN) READ)'- (sErECr +) 1

  • Hitachi MP-1802, dr (3) E*planation of the Mechanisms 1. Drive mechanism The spindle rotates at 300 rpm ( 200m sfrotation) with a DC drive motor and drive belt. The motor starts and stops with the Mffi signal. 2. Spindle Front Door Mechanism By pre s sing the fr ont door , the centering c one , supported by the cone thrust arm, enters the centre hole of the disk. Before the cone is lowered, the eone is enlarged so that it takes hold of the inner diameter of the disk thus clamping at the correct

  • Hitachi MP-1802, 4. PART NAI'IES 4-l . MP-3550 oRrvE-0 ORIVE.I drive -1 drive- 2 power switch I roll _ oFF power cord. holder fan connector (data) POwer Ccrrc +-2. MP-|802 (-to MP-355OttNIT-l) l{DB-A ,C,8, -I{DB-B P.C.B. - '.-3 edge conneetor (to J.eyel3) power lamp .../5

  • with asynchronous ( ripple clock) counters . A buffered clock input triggers the four flip-f1ops on the rising (positive- going ) edge of the clock lnput waveform. This counter is f u11y progranmabl-e; that is, the outputs may be preset to either I H I and rL I level, As presetting is synchronous, setting up a l-o

  • Hitachi MP-1802, ( Down2 ) to Down IN and Up OUT, Down OUT to make AMP IN. ) r1 l. CI R CUI T EXPLANA TI ON 7 -1 Structure The LeveL-3 minifloppy disk system consists of the minifloppy disk unit MP - 3550 and the minifloppy disk card MP -1 802. The MDDs (mini disk drive units), a power unit and a VFO sep ayator are i-ncorporated in the MP - 3550. The MP-1802 includes an IC61 SFDC (floppy disk controller) and MDD interf ace ci-rcuit, an address decoder circuit and MDD select ci-rcuit among others . f t transf ers the interf

  • Hitachi MP-1802, work area (1) (ll d-isptay_ RAM area (Jr worK area user R,,N{ area Disk Basic RAM area ROM area, BASrC I monitor (24K byte) 5 User RAM head a 3Fsoo lFFOO 3FFO4 IFFOE 3FFFO IFFFF ],^ address o Fig . 7 .20 Memory Map ( naU /+O Kbyte ) 7-5 Address Decoder (Mp-1g02\ The address decoder is becomes ttLrt if $f'gOO addressed at ftHtf l_evel switch CS61 2 chips are shlpped. ) shown in Fig . 7 .21 . The IC6Z3 @ pin $r'nFp' Gcelz B0oT ROM address) i." of vMA.m.R/W. (The chip- inserted in terminals 1 - 2 when The IC62O @ pin b

  • Hitachi MP-1802, )i How to Remove the Front Panel (t ) Remove the power unit/FCN pcB anci MllD unlt. (Z) Remove the front panel fixing screws @) *r shown in Fig. 1 0. 9. See Fig. 1 0 .13. ... /70

  • Hitachi MP-1802, 3. SPECIFICATION 3 -1 tlP -3550 x Data Record Capacitv UNI T 655 Kbytes DRI VE 328 Kbyte s Number of sides per DRI VE 2 sides No. of cyfinders per DRI VE /+0 cylinders No. of sectors per track 1 6 sectors No. of data per sector 256 bytes Note : The above figures may vary depending on the system diskette in use. Refer to the system disk nanual f or details. * Environnent Conditions ftem Te mp erat ur e Humidity Max. Wet Bulb Temperature 0perati-on 5oc - 35oc 2or" gof, No dew at zgo c Non 0perati on -1ooc- /r5oc B 1[ 8oi[ Tran sp or tat i on -1ooc- 5ooc B% - B0% Note : During non-operation or transportation, the

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