Mitsubishi M4853 Installation and operation manual

MITSOBISBI
5 l/4- FLEXIBLE DISK DRIVE
MODEL M4853
OEM MANUAL
TJ2-G30213 A
9/83

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M4853·1 flu."ble Disk Driye

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1.1
1.2
1.2.1
1.2.2
1.2.3
1.2."
1.2.5
2.
2. ,
2.2
2.3
2.11
2.5
3.
3.1
3.2
3.3
3.11
3.5
3.6
3.7
3.8
II.
11.1
".1.1
".1.2
".1.3
".1."
".2
... 2.1
""85"-1S OEM MANUAL
TABLE Of CONTENIS
INTRODUCTION •••.••••••••••••••••••••••••• 1_1
General Descr1ption •••••••••••••••••••••• 1-2
Specit1cations ••••••••••••••••••••••••••• 1-3
Pertormance Specs •••••••••••••••••••••• 1-3
Functional Specs ••••••••••••••••••••••• 1- ..
Pbyslcal Specs ••••••••••••••••••••••••• 1-5
Environment.l Specs •••••••••••••••••••• 1-6
Reliability Specs •••••••••••••••••••••• 1-7
GE.EIAL OPEIATIO ••••••••••••••••••••••••• 2-1
Srstem Operat1on ••••••••••••••••••••••••• 2-1
Electronlcs •••••••••••••••••••••••••••••• 2-1
Rotation Hecbanlsm ••••••••••••••••••••••• 2-3
Positioning Hechanlsm •••••••••••••••••••• 2-3
le.d/Wrlte Heads ••••••••••••••••••••••••• 2-3
FUNCTIONAL OPERATION ••••••••••••••••••••• 3-1
Pover-On Sequenc1ng •••••••••••••••••••••• 3-1
Drive Selectlon •••••••••••••••••••••••••• 3-1
Positioning Operatlon •••••••••••••••••••• 3-1
Side Selectlon ••••••••••••••••••••••••••• 3-2
lead Operatlons •••••••••••••••••••••••••• 3-2
Write Operatlons ••••••••••••••••••••••••• 3-2
Dlsk Insertion ••••••••••••••••••••••••••• 3-3
Disk Removal ••••••••••••••••••••••••••••• 3-3
ELECTRICAL INTERFACE ••••••••••••••••••••• "-l
Signal Intert.ce ........................... -3
C.bling Method .nd Input Termlnations .... -3
Llne Drives and Recelvers ................ -3
Input Slgnal L1nes ....................... -5
Output Slgnal L1nes ..................... -11
Power Intert.ce •••••••••• ~ •••••••••••• ~ ... -1 ..
DC Power •••••••••••••••.••••••••••••••• --,,,
111

5.
5.1
5.2
5.3
5.&1
6.
6.1
6.2
7.
8.
8.1
S.1.1
8.1.2
8.1.3
8.2
8.3
8.3.1
8.3.2
9.
9.1
9.2
PHYSICAL INTERFACE ••••••••••••••••••••••• 5-1
S1gnal Connector ••••••••••••••••••••••••• 5-1
DC Power Connector •••••••••• ~ •••••••••••• 5-3
Frame Ground Connector ••••••.•••••••••••• 5-~
Interface Connector Locat1on ••••••• ~ ••••• 5-5
PHYSICAL SPECIFICATIONS ••••••••.••••••••• 6-1
Installat10n Or1entat1on ••••••••••••••••• 6-1
Dr1ve D1mensions
••••••••••••••••••••••••• 6-1
USER OPT10IS ••••••••••••••••••••••••••••• 7-1
.Drive Select Options ••••••••••••••••••••• 7-1
Motor Control Options ••••••••••••.•••••••• 7-2
Ready Output Opt1ons ••••••••••••••••••••• T-5
Head Load Opt1ons •••••••••••••••••••••••• 7-8
LED Opt1ons ••••••••••••••••••••••••••••• 7~'O
Term1nat1ons •••••••••••••••••••••••••••• 7-12
Frame Ground ••••••••••••••••••• ~ •••••••• 7-12
Opt1ons Summary ••••••• ~ ••••••••••••••••• 7-13
RECORDING FORHAT ••••••••••••.••••••••••••• 8-1
Record1ng Encod1ng ••••••••••••••••••••••• 8-1
FH ••••••••••••••••••••••••••••••••••••• 8-2
MFH •••••••••••••••••••••••••••••••••••• 8-3
HHFH ••••••••••••••••••••••••••••••••••• 8-'1
Recommended Formatt1ng ••••••••••••••••••• 8-5
Error Detection and Correct1on •••••••••• 8.;.12
Write Errors •••••••••••••••••••••••••• 8-12
Read Er~ors ••••••••••••••••••••••••••• 8-12
SHIPPING •••••••••••••••••••••.•.••••••••. 9-1
Shipping Damage •••••••••••••••••••••••••• 9-1
Re-Sh 1pp1nl •••••••••••••.•••••••••..•... •·9-1
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Li$t pf figyrc$
2-1 H~85q-1S Functional Diagram
3-1 Comparison of FH and HFH Encoding
3-2 Read/Write Drive Compatibility
q-1 Cab11nt Hethod
q-2 Recommended L1ne Driver and Receiver C1rcuit
4-3 Dr1ve Select Timing
q-~ Side Select Timing
q-5 Step T1ming
4-7 Index T1ming
4-B
Track 00 T1m1ng
q-9 Bas1c Ready T1ming
5-1 Connector J1 Dimensions and P1n Numbers
5-2 Connector J2
5-3 Connector Locat1on D1agram
6-1 Disk Dr1ve Installation Directions
6~2 Dimensions of MQB5Q-1S
7-1 In-Use Latch Tim1ng
7-2 Current Ready (I) Timing
7-3 Held Ready (II) T1m1ng
7-q D1sk Change (Drive Select Reset) Timing
7-5 Disk Change (Step Pulse Reset) Timing
7-6 Head Load Opt1ons Schemat1c
7-7 Fr~me Croud Circu1t
7-B PCB Option Locat1ons
8-1 FH Wr1te T1m1ng
B-2 FH Read T1m1ng
8-3 MFH Wr1te T1m1ng
B-q MYH Read Timing
B-5 HKFH Write T1ming
8-6 HHFH Read T1ming
8-7 ISO-7Q87/2 style, Track DO, Side 0 (FH)
8-8 ISO-7Q87/2 style, All other tracks (MFH)
8-9 512 Bytes/Sector, Standard Format
8-10 1,02Q Bytes/Sector, Standard Format
8-11 256 Bytes/Sector, S1mplif1ed For~at
8-12 512 Bytes/Sector, ~illp11f1ed Forn'at
8-13 256 Bytes/Sector, IEC 765A Format
8-1q 512 Bytes/Sector, IEC 765A Format
8-15 1,02- Bytes/Sector, IEC 765A Format
9-1 Head Protection sheet Installation
9-2 Bag and Board Assembly
9-3 Ten-Pack Carton Assellbly
9-~ S1ngle-Pack Carton Asse~bly
1v

List pf Tables
1-1 Performance Specifications
1-2 Funct10nal Specifications
1-3 Physical Specifications
1-4 Environmental Specifications
1-5 Reliability Specifications
4-1 DC Power Connector Pin Arrangement
_-2 Signal Connector Pin Arrangement
--3 DC Power Specifications
5-1 Connector for TWisted-Pair Cable (P1)
5-2 Connector for Flat Cable (P1)
5-3 DC Power Connectors
'1-1 Option Summary
y

1. INTRODUCTION
The K1tsub1sh1 K~85~-1S 1s a high-performance, double-sided,
double bit and double track ~ens~ty flexible disk drive using a
high-density 5.25-inch d1skette, that provides maximum customer
~~t~~raction with hlgh reliability and long service life.
-Main Features -
o Has an
unformatted capacity of 1.6 mega-byte, and a transfer
rate of 500 kbit/sec.
o Spindle speed can be selected from interface (360 RPM to 300
RPK). Changes disk capacity to 1.0 Kegabyte.
o Is compatible with the new IBH PC-AT (trademark of
International Business Machines Corporation) Whigh capacity"
floppy disk dr1ve, either w1th a 300 or 250 Kblt/second
transfer rate.
o Is electrically compatible with 8" floppy disk drive
controllers.
o LSI ICs have been used to reduce the size of the drive and
1~~rp~~p rpJiability.
o Easily removed front panel allows packaging flexibility.
o Includes'a diskette ejector for easy diskette removal.
o A circular gimbal spring 1n the read/write head suspension
aechanism greatly improves med1um tracking performance.
o The steel band, flat stepping motor drive system for
posit1on1ng achieves the best 1ntertrack access til;e in ~ts
class: just 3 ms.
o The maintenance-free, DC, brushless, direct-drive motor
obviates ttte bel t replacement necessary (or conventional
counterparts.
o Excellent med1a interchangeab1lity, wide off-track window
time Ita rgin, and hi tit ,.er (orl.ance are ma 1nta ined ove r wide
ambient temperature and relative humid1ty ranges.
o The hlgh-torque sp1ndle Inotor permits control by s~itcbing
on and off either the motor (starting t1me 500 illS) or the
head load solenoid (loadine tll\e less than 50 liS).
o Dynam!c clamping insures correct disk seating w~th easy disk
insertion.
1-1

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,., GENERAL DESCRIPTION
o The MQB5Q-1S Flexible Disk Drive 1s a t~in-head,
double-~i ded. magnet! c disk dri ve with an
unformated memory capa~lt) of 1.6 megabyte (360
RPM), or 1.0 megabyte (300 RPM), for double-
density recordings.
o For 1.6 Megabye operation the K4B54-1S reads and
wr1tes 5.25-1nch, double-s1ded high density
dIskettes in double-density for~at.
o The fo;q 85Q-1S employs the unique Mi tsubi st,1
circular gimbal spring for holding and loading the
magnetic heads to assure soft, steady contact with
the aed1um. This lDeans elcellent read/write
operation and a long service life for the medium.
One of the outstanding features of this .echanism
is reduction of the effects of jacket deforlhation
and thickness variations, thereby &tabilizing
read/write performance.
o By changing the data transfer rate and/or the
spindle speed, and translating track numbers given
to the controller, three different types of dl~~~
ma~ b~ acco~odat.€d:
A)
96
TPI,
high density disks may
be read and
written without restriction.
B)
96
TPI, .
standard density dlS~S
"lay be
read
and written
after
changing
either
the
transfer
rate or the spindle speed.
C) .8 TPI, standard density disks may be read
and written on, after changing the transfer
rate or the spindle speed. Once written upon
by the H4854-1S, the disk cannot be reliably
used in a .8 TP1 disk drive again.
o The H4854-1S allows two methods of dOk~~6rd
COli pit t 1 bil1 ty :
A) 360 RPM operation, with either 500 or 300
[bit/second transfer rates. A -low write
current- input must be used to write on
standard density .,dia.
The spindle speed IDay be lowered to 300 by
use of an input to the drive. The transfer
rate would be changed to 250 Kbit/second.
1-2

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1.2
SPECIFICATIONS
, .2. ,
Performance specifications (Table 1-1)
Hemory capad ty
Unformatted
Disk, kilobytes
Per surface, kilobytes
Per track, ki.lobytes
Formatted
Disk, kilobytes
Per surface, kilobytes
Per track, bytes
(bytes/sector)
(sectors/track)
Transfer rate. Kbits/sec
Ave'rage la tency tilDe
Hot6r starting ti~e.nSec.max
Access time
Track to track
Iverage
Settling time
Head loading time
Speed change time
360 RPM
1.6 HB 1.0 HB
1664
832
10.11
1228.8
6'''.11
7680
(512)
(15)
500
83
500
1000
500
6.25
655.4
327.7
_096
(256)
(16)
300
83
500
3 mS maximum (unsettled)
300 RPM
1.0 HB
1000
500
6.25
655.11
327.7
" 096
(256 )
(16)
250
100
" 00
9" mS (including settling time)
15 mS maximum
50 mS maximum (including settling>
.
400 nSec lIaxillum
Table 1-1 Performance Specifications
1-3

1.2.2
functional specifications (Table 1-2)
Magnetic flux inversion
density
Encodin£. II'lethod
Track
density
Number of cylinders
Humber of tracks
Number of heads
Rot.at.ion period
Index
Media
360 RPM 300 RPM
1.6 MB 1.0 MB 1.0MB
9870 5922 5922
9B70
FeI
5922 5922
MFM
MFM
Mn~
96 96
96
80 BO
BO
160
160
160
2 2 2
166.7 £ 3.3 mSec
1
Double-sided 96 TPI,
double densit.y, h1gh-
density 5.25 inches
diskette, soft ~ect.ored
ExAmples:
Brown Disk Mfgr.
Maxell
Memorex
BASF
Dysan
UHR-2
MD2-HD
20-BO-HD
HDFD
UHR-2
Table 1-2 Funct.ional Specificat.ions
1-"
·
., ."

Physical specifications (Table 1-3)
.12 V
Heat dissipation
Physical dimensions
Height
Width
Depth
Front panel d1l1'1ensions
Height
Width
Weight
.. 5 V 51, 0•5 A t y pic a1 ( seek i ng)
.12 V 51, 0.5 A typical (seeking)
8.5 watts typical, seeking
5.0 watts typical, reading in
E-taf\dby DIode
t.O watts typical motor off
(Ex cept
for
front
panel)
1.62 in
(li 1
mm)
5.75
in
(1"6
D!D'. )
7.68 in
(195
Irm)
1.65
1n
(lI2.0 mm)
5.83
in
( 146.0 mm)
2.9
lbs
(1. 3 kg)
Table 1-3 Physical Specif1catjons
1-5

1.2.4 Environmental Specif1cat~ons (Table 1-~)
OperatinL ~nviron~enta'
conditior.~ .
Ambient
temperature
Relative humidity
Shock
Vibration
Altitude
Non-operating environmental
conditions
Ambient temperature
Relative humidity
Shock
Vibration
Altitude
Transportation environment
conditions (max 72 hours)
AmbiepL temperature
Relative Humidity
5 to 46 Deg. C (_1 F tc 115 F)
20S to 80S (Maximum wet bulb
temperature: 29 C (85 F)
2.5 G Max (20 mSec)
0.25 G Max (5-200 Hz.)
-300 to 3000 meters
-20 to 51 Deg. C (-~ F to 125 F)
51 to 95S, non-condensir.&
30 G Max (20 mSec)
3.0 G Hax (5-200 Hz.)
-300 to 3000 meters
-40 to 62 Deg. C
(-40 to 144 Deg. F)
11 to 951, non-condensing
Table 1-4 Environmental Specifications
1-6

"
1.2.5 Re11ab~11ty spec1ficetions (Table 1-5)
HTBF 10,000 POH (Power On Hours)
minimum
~TTR 30 minutes
Unit life
Media life
Insertion
Rotational 11 fe
Tap-tap
Error rate
Soft read error
Hard read error
(Both hard and soft
error rates assume
a 100S open MF~ data
and clock window, and
8 correctly operating
phase-lock loop data
separator)
Seek error
5 years or 20,000 energized hours,
whichever comes first
~
3 1 10 or more
6
3.5 x 10 pass/track or more
4
5 I 10 on the same spot of a
track
-9
10 bit (2 retries)
-12
10 bit (10 retries)
-6
10 seek
Table 1-5 Reliability Specifications
1-7

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1-8

..
2. GENERAL OPER~TION
2.1 SYSTEM OPERATION
The H~85~-1S flexible Disk Drive consists of a mediun.
rotatine mechanism, two read/write hea~s, an actuator
to positio~ L~e read/write heads on tracks, a solenoid
to load the read/write ~ead~ on the medium, electronic
circuits to read and write data, and to drive these
componel"ts.
The rotation ~echanism clamps the medium Inserted il"Lo
the drive to the spindle, which j~ direetly coupled to
the DC brushless motor. and rotates it at 360 or 300
RPM. n.e rosltloning actuator moves the read/write to
be head over the desired track of the medium. Then,
the head loading solel"ojd loads the read/write head on
the medium to read or write data.
2.2 ELECTRONIC CIRCUITS
The electronic cIrcuits driving the individual
mechanism.s of the "1&851&-15 are located on a single
rrinted-circuit board, which consists of the following
c1 rcul ts:
o Line driver and receiver that elchanees sitn.l~
with the host syste~ .
o
Drive selection circuit
o Index detection circuit
. 0 Head positioning actuator drive circuit
o Head loadlne solenoid drive circuit
o Spindle motor control speed clrcu~t
o Read/write circuit
o Write protect circuit
o Hormal/low write current selection circuit
o Track 00 detection circuit
o Drive ready detection circuit
o Head selection circuit·
o In use indicator LED driye circuit
2-1

.
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READ DAn
WRITE CATE
WRITE DATA
'~RI TE PROTECT
SIDE SELtCT
IN USE
STEP
DI REC'I' I Ol~
SEU::.
OJUV£ SEL.i:CT
HIOEX
I1OJ'OR ON
READ
CIRCUIT
WRITE
CIRCUIT
CONTROL
LOGIC
.
READ/WRITE HEAD 0
READ/WRITE HEAD 1
""""--'-----'- '''RITE PROTECT
DETECTOR
,------
INDEX LED
ACTIVITY
LEO
DISK
...- -PRESENT
SWITCH
"
INDEX DETECTOR
.... -----------
I
I
I
I
CONTROL
CIRCUIT
SPINDLE MOTOR ASSY
--------~--------
DC MOTOR I
I
I
I
I
I
I
I
I I
L _____________ ~ ______________ ~
.
Figure 2-1
"qB5~-'S Functional Diagram
2-2

2.3 ROTATION MECHANISM
2.!l .
The di~~ette rotation ~echanism uses a DC brushless
direct-drive motor to directly rotate the spi~o)e at
300 or 360 RPM.
POSITIONING t'.ECHA~ISH
The positioning mechanism is a high-performance ~t~~)
band tYfr.
The head carriage assembly is fastened to the steel
band which in turn is secured around the capstan of a
two-phase hybrid s~epping motor; e 1.8 turn of the
steppine ~otor moves the read/write ~ead one track in
the designated direction, thus positioning the
read/write head.
This drive syst.em is temperature cOIr;,lensat.ed t.o
mibimize read/write head deviations from the disk
t.racks caused by ambient temperature change.
2.5 READ/WRITE HEADS
The read/write heads use HnZn magnetic ferrite.
Eac~ read/writ.e heaG has three ferrite cores,
co~~isting of a read/write core and erase cores on both
sides of the read/write core to erase the space between
tracks (tunnel erase).
The two read/write heads, which are located face-to-
face with the disk between them, are mounted er.
compliant, circular gimb&l springs so that t.he heads
track tt.e disk with good contact to enable Dlaxi mUD;
reproduction of the signals from the disk. The high
surface tracking ability of the circular gimbal keeps
the disk free of stress, and thus improves diskett~
I j fp..
2-3

..
. .

.'
3. FUNCTIONAL OPE~~!IO~
3.1 POWER ON SEQUENCING
No operation ~ay be performed for a period of 100 msec
after the application of DC power to th~ drive.
The read/write head ~ay be positioned on an incorrect
track after switching the DC power on, so before
starting a read/write operation, perform a step out
operation until a track 00 s1gnal is detected, thus
correctl y posi t10nS ne. the t.ead at a known posi ti c 1'1.
3.2 DRIVE SELECTION
The M~B5~-'S daisy chain cabling system per~its
conl'lection of multiple drives with a single cable.
These drives are selected when the drive select ljl'le~
from the control Ie r beCOD·e acti ve. Onl y . the dri ve
who~e driVE ~elect line is active sends and receives
signals to and from the ho~t system. The sele~t lines
on the drives must have different numbers if two or
more drive~ &re connected. If the same number is
assigned, an operation error occurs due to interferenc£
alflone the output signals of tile drive~.
3.3 POSITIONING OPERATION
The seek operation .. hich 1J,0ve~ tite read/write head to
t~e desired track selects a direction first, inward or
outwa rd. wi th the pola ri ty . of Ule di rec tion s el ect
signal; and ~oves the head with the step Signal. If
access to a track two or more tracks away is required,
step pulses are continuously sent until the head moves
to the desired track.
Head movement occurs with the trailSne. ede.~ of t~e ~ter
pulse.
sometimes write) a ~B TPI
But U.e ~oftwa re DlJS t
two -96
TPI- tracks for
It is allowable to read (and
disk 1n a 96 TPI disk drive.
command the controller to move
one .B TPI track.
3-1

3.4 SIDE ONE SELECT10N
The read/write heads located on both sides of the
diskette are selected by the side one select signal.
When the side one select ljne is high, the side 0 head
1~ select~d. When ,t is low the side 1 head 1s
selected. .
3.5 READ OPERATION
Three ~odes of encoding, FH, KFH, or HHFH are used for
the data stored on ~~d1a. FH is used for single-
density recording, and HFH or KKFH for double-density
recordir"e,.
The required timing of operations for reading is
described in Chapters _ and 8.
A comparison of the FH and HFH encoding modes is shc~n
in Fig. 3-1. See chapter B for a complete description
of encoding ~ethods.
3.6 WRITE OPERATIONS
~rite data can be encoded by either FH, KFH, or HMFH.
The Hq85~-'S has eood contact stability of the
read/write heads on the medium and employs high-
perfor~ance read/write heads, so no precompensation is
necessary for correcting the bit shift effect when
writing data in the HFH ~ode (double density).
However, if it is desired preco~pensation of 150 nSec
or smaller should be used on tracks -3 and above, and
none
~hould be used on lower numbered tracks.
When using the drive 1n a 300 or 250 K bit/second
transfer rate mode no precompensation can be used.
Doing so will only reduce the read data ~1ndow ~are1n~.
The requ1redt1m1ng of operations for reading is
described 1n Chapters _ and 8. See chapter 8 for a
complete description of encoding methods. See Fie,ure
3-2 for allowable read/write combinations between
different types of drives.
3-2