M R 5 2 1 MITSUBISHI
NO MORE PRODUCED Native| Translation
------+-----+-----+-----
Form 5.25"/HH Cylinders 1224| | |
Capacity form/unform 10/ 13 MB Heads 2| | |
Seek time / track 85.0/18.0 ms Sector/track 20| | |
Controller MFM / ST412 Precompensation 256
Cache/Buffer KB Landing Zone 665
Data transfer rate 0.625 MB/S int Bytes/Sector 256
0.625 MB/S ext
Recording method MFM operating | non-operating
-------------+--------------
Supply voltage 5/12 V Temperature *C 5 50 | -40 70
Power: sleep W Humidity % 8 80 | 5 95
standby 15.0 W Altitude km 2.000| 12.000
idle W Shock g 2 | 30
seek W Rotation RPM 3465
read/write W Acoustic dBA
spin-up W ECC Bit -
MTBF h 20000
Warranty Month
Lift/Lock/Park NO Certificates
**********************************************************************
L A Y O U T
**********************************************************************
MITSUBI. MR521/MR522 SPECIFICATIONS S06-G30047C 8/4/1984
+---------------------------------------------------------+
| |XX J6
| |XX Power
| |
| +--6 |xx
| PCB EDGE SW2 | | |XX J1
| COMPONENT SIDE | | |XX
| +--1 |XX
| +--6 |XX
| SW1 | | |XX
| | | |XX
| +--1 |
| |
| |xx
| |XX J2
| |XX
| |XX
| |XX
+---------------------------------------------------------+
**********************************************************************
J U M P E R S
**********************************************************************
MITSUBI. MR521/MR522 SPECIFICATION S06-G30047C, 8/4/1984
Jumper Setting
==============
|
|
|
| |
| +-SW1--++SW2---+ |
| | || | |
| 1------61------6 |
| |
+-+ ++ +--------+ ++ +--+ J6 |
| J2 || | | J1 || | | XXXXXXX |
+----------++-+ +--------------------++-+ +----------+
SW1 SW2
1-+-+-+-+-+-6 1-+-+-+-+-+-6 ON
| | | | | | | | | | | | | |
+-+-+-+-+-+-+ +-+-+-+-+-+-+ OFF
RADIAL (R) --------+ | | | | | | | | | | +- TERMINATION SWITCH
DIAGNOSTIC (D) ------+ | | | | | | | | +--- NOT USED
DRIVE SELECT 4 (DS4) --+ | | | | | | +----- TERMINATION SWITCH
DRIVE SELECT 3 (DS3) ----+ | | | | +------- TERMINATION SWITCH
DRIVE SELECT 2 (DS2) ------+ | | +--------- TERMINATION SWITCH
DRIVE SELECT 1 (DS1) --------+ +----------- TERMINATION SWITCH
Customer-Option Switches
------------------------
There are two switches on the main circuit board of this drive. The
drive address can be specified and the customer-option functions are
selected with these switches.
Drive Select
------------
In multiple unit connection it is necessary to configure each drive
with a unique address. To select the desired drive number in a
daisy-chain operation.
+-----------+---------------------------+ -------+
| SW1 |Drive Select Configuration | +-++-+|ON
+----+------+------+-----+----+---------+ |x||x||
|Bit |*Mark | 1 | 2 | 3 | 4 | OFF+-++-+|
+----+------+------+-----+----+---------+ -----------+----
| 6 | DS1 | ON | OFF |OFF |OFF |
+----+------+------+-----+----+---------+
| 5 | DS2 | OFF| ON |OFF |OFF |
+----+------+------+-----+----+---------+
| 4 | DS3 | OFF| OFF |ON |OFF |
+----+------+------+-----+----+---------+
| 3 | DS4 | OFF| OFF |OFF |ON |
+----+------+------+-----+----+---------+
*Mark is printed on Printed Circuit Board (PCB).
Radial Option
-------------
On leaving the factory, the switch marked "R" of SW1 is set in the
ON position -- lever up and the transfer of control signals to and
from the drive is enabled only when the address of DRIVE SELECT 1, 2,
3, or 4 matches the drive address (daisy-chain operation).
When the switch is in the OFF position -- lever down, the transfer of
control signals is enabled regardless of the DRIVE SELECT signal
(radial operation).
When the "R" option is used, the "Drive Selected" indicator lamp on
the front of the drive does not light. To make this lamp light, a
DRIVE SELECT signal shall be applied.
Diagnostic Option
-----------------
Before turning on the power set the switch marked "D" on switch
assembly SW1 to on. This action will select the diagnostic option.
After the power is applied and spindle spins at the specified
rotating speed, the drive will start a diagnostic seek operation.
And then the switch (SW1-D) is set off position, the head will auto-
matically position itself in the shipping zone for shipment. The
switch should be maintained in an "off" position for normal drive
operation.
Terminators
-----------
To provide termination for the last unit, all switches of SW2 should
be set in ON position -- lever up. On all other units, all switches
of SW2 should be set in OFF position -- lever down.
**********************************************************************
I N S T A L L
**********************************************************************
MITSUBI. MR521/MR522 SPECIFICATIONS S06-G30047C, 8/4/1984
Notes on Installation
=====================
Drive mounting
--------------
horizontally vertically
+-----------------+ +--+ +--+ +------------------+
| | | +-----+ +-----+ | | | x
| | | | | | | | x+----------------+x
+-+-----------------+-+ | | | | | | ||x x||
+---------------------+ | | | | | | || x x ||
| | | | | | || x x ||
x x | | | | | | || x x ||
+------x------x-------+ | +-----+ +-----+ | || xx ||
+-+------x--x-------+-+ +--+ +--+ || x x ||
| xx | || x x ||
| x x | || x x ||
+---x--------x----+ |x x|
x x x++----------------++x
UNACCEPTABLE! UNACCEPTABLE!
The installation directions are as follows:
Vertical: on either side
Horizontal: PCB down
When installing the drive in its final location, particular attention
must be paid to the following points.
1. Ventilation, adequate ventilation must be provided to allow any
heat generated to dissipate.
2. Serviceability
3. The drive must be so installed so as to put no under strain on the
units frame.
Vertical Screw Penetration 2.5 mm Max
Horizonatl Screw Penetration 6.0 mm Max
J1/P1 Connector - Control Signals
---------------------------------
Connection to J1 is via a 34 pin PCB edge connector. The pins are
numbered 1 through 34 with the even pins located on the component
side of the circuit board and the odd numbers on the soldered side. A
key slot is provided between pins 4 and 6.
Flat ribbon or twisted pair - maximum length 20 ft, line impedance
100 10 ohms.
Mating Connector: 3M ribbon connector P/N 3463-0001 or equivalent
J2/P2 Connector - Data Signals
------------------------------
Connection to J2 is via a 20 pin PCB edge connector. The pins are
numbered 1 through 20 with the even pins located on the component
side of the circuit board. A key slot is provided between pins 4 and
6.
Flat ribbon or twisted pair - maximum length 20 ft, line impedance
100 10 ohms.
Mating Connector: 3M ribbon connector P/N 3461-0001 or equivalent
J6/P6 Connector - DC Power
--------------------------
The DC power connector J6 is a 4 pin AMP MATE-N-LOK connector P/N
350211-1 or equivalent, mounted on PCB.
Mating Connector and pins: AMP P/N 1-480424-0 (housing)
AMP P/N 614D3-1 (pin connector)
Frame Ground Connector
----------------------
With this drive, the DC ground for the PCB and the frame-ground for
the base are connected. The frame-ground connector for this drive is
a P/N 61761-2 AMP Faston terminal.
Mating connector: AMP P/N 62187-1
Multiple Unit Connection (Case of 4 Drives)
-------------------------------------------
HOST
+-----------+ +-----------------+
| +---o---Control------------------+J1 Drive 1 |
| | | +-------Data------------+J2 |
| | | | +---------Power---+J6 FG ... |
| | | | | +-----+-----------+
| | | | | +-Frame-GND+
| | | | | | +-----------------+
|Controller | o----+-----+--Control---+----+J1 Drive 2 |
| | | | +---+------------+----+J2 |
| | | | | | +-Power---+----+J6 FG ... |
| | | | | | | | +----+------------+
| | | | | | | o---------+
+-----------+ | | | | | | +-----------------+
+-----------+ o----+-+---+--+-Control-+----+J1 Drive 3 |
| | | | | +-+--+---------+----+J2 |
| +---+----+ | | | | +-Power+----+J6 FG ... |
| +---+-Data-+ | | | | | +-----+-----------+
| | | | | | | o----------+
|Data +---+-Data---+ | | | | +-----------------+
|Separator | +--Control-+--+--+------+----+J1 Drive 4 |
| +-Data---------+--+--+------+----+J2 |
| | | | | +-Pow+er--+J6 FG XXX |
+-----------+ | | | | | +-----+-----------+
| | | | o----------+
DC + -+ | | | |
voltages-+ ----+ | | |
(RADIAL)-+ -------+ | |
+ ---------+ |
Frame GND --------------+
... = Terminator switches OFF
XXX = Terminator switches ON
**********************************************************************
F E A T U R E S
**********************************************************************
MITSUBI. MR521/MR522 SPECIFICATIONS S06-G30047C, 8/4/1984
Features
--------
This highly-reliable miniature disk drive contains a 5-1/4" fixed
disk and has been designed and manufactured to the same external
dimensions as a 5-1/4" half height mini flexible disk drive. The
MR52x series provides large capacity and high speed, up to 25.5
MBytes and an access time of 85 ms, in a small compact drive. The
series employs many aspects of "Winchester" technology such as disk,
head, shield enc., and clean air circulation system. To achieve
accurate servo system controlled by a microprocessor is utilized, the
processor also being used for other task to ensure a more reliable
drive.
Seek Time
---------
+----------------------------------+--------+
|Track-to-Track msec. typ. | 18 |
+----------------------------------+--------+
|Average msec. typ. | 85 |
| msec. max. | 199 |
+----------------------------------+--------+
|Latency msec. avg. | 8.48 |
+----------------------------------+--------+
Air filtration
--------------
Superior resistance to dust.
Elimination rate of better than 99.97% for dust particles of greater
than 0.3 m diameter. Effects of changes in altitude, atmospheric
pressure, and temperature eliminated through use of special
replaceable breath filter. Unnecessary to replace main filter.
Positioning method
------------------
Swing-arm system using high-performance stepping motor and band
actuator in combination gives high accuracy positioning by embedded
servo mechanism.
Heat Dissipation
----------------
15W for MR521, 18W for MR522
Record media failure (tracks containing nonrecoverable errors)
--------------------------------------------------------------
Errors of more than 1 bit length: 10 tracks or less per one data
head are indicated on a label affixed to the drive prior to shipment
from the factory: alternate track processing is necessary for these
tracks.
Power Interface
---------------
This drive requires an external DC power supply. Pin designations for
the DC-power connector J6/P6 and the power requirements are shown in
the following table.
+---------+-----------+-----------------+-----------------+
|J6/P6 Pin|DC power |Power conditions |Ripple conditions|
|Number | | | |
+---------+-----------+-----------------+-----------------+
| 1 |+12V 0.6V|1.0 A Typ (MR521)|100 mVp-p Max |
| | |1.2 A Typ (MR522)| |
| | |3.0 A Starting | |
+---------+-----------+-----------------+-----------------+
| 2 |+12V Return| | |
+---------+-----------+-----------------+-----------------+
| 3 |+5V Return | | |
+---------+-----------+-----------------+-----------------+
| 4 |+5V 0.25V|0.7 A Typ |50 mVp-p Max |
| | |1.5 A Max | |
+---------+-----------+-----------------+-----------------+
Spike noise: 4% or less
Power-on time
-------------
The power should reach 90% of its final value within one second. When
the power reaches the 90% level, an unsaf condition is cleared
automatically.
Power cut-offs
--------------
The recorded data is protected even in the event of an abnormal DC
power condition, except when a write operation is being executed.
Power on/off sequence
---------------------
Joint power use with the host system is recommended for the +5V
power supply.
When separate power supply is used, the host system power should be
turned on first, and then that of the drive(s). When turning off the
power, the drive power should be turned off first, and then that of
the host system.
Whenever a separate +12V power supply is used, no particular power
sequence need.
Shipping Zone
-------------
In order to prevent damage to the head and disk caused by vibration
and shock during shipment, an shipping zone is provided for head
storage. The shpping zone is located on the inner most track at
cylinder 665.
The head can be located in this zone by either of the following
methods:
1. When the drive is in the ready state, the head can be moved to
cylinder 665 by seek operation.
2. After the switch (SW1-D) is set in the on position, turning on the
power of the drive, the drive will start a seek operation.
N.B. Return switch SW1-D to the off position to ensure normal
operation.
In diagnostic operation switch off after diagnostic seek opera-
tion, then the head will be automatically moved to cylinder 665.
Write Precompensation
---------------------
When a particular data pattern is written, bit shifting due to the
superposition of the magnetization patterns of adjacent bits can
occur, causing errors. Precompensation is used to prevent this. With
this precompensation, when data is written, the write timing is
switched beforehand to the opposite direction of the data-shift
direction. The duration of the timing switch for nominal bit
positions is -12ns (early) or +12ns (late).
In order to provide for a satisfactorily lower error rate for the
drive, the host-system timing for MFM write data may not be pre-
compensated at all tracks or pre-compensated at track numbers greater
than 256.
