M R 5 3 5    MITSUBISHI

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                                                      Native|  Translation
                                                      ------+-----+-----+-----
Form                 5.25"/HH              Cylinders     977|     |     |
Capacity form/unform    42/   50 MB        Heads           5|     |     |
Seek time   / track  28.0/ 5.0 ms          Sector/track   17|     |     |
Controller           MFM / ST506           Precompensation   300
Cache/Buffer               KB              Landing Zone
Data transfer rate    0.625 MB/S int       Bytes/Sector      512
                      0.625 MB/S ext
Recording method     MFM                            operating  | non-operating
                                                  -------------+--------------
Supply voltage     5/12 V       Temperature *C        10 50    |    -40 60
Power: sleep              W     Humidity     %         8 80    |      5 95
       standby            W     Altitude    km            2.000|        12.000
       idle          18.0 W     Shock        g         2       |     30
       seek               W     Rotation   RPM      3600
       read/write         W     Acoustic   dBA
       spin-up            W     ECC        Bit   32
                                MTBF         h      30000
                                Warranty Month
Lift/Lock/Park     YES          Certificates


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MITSUBI. MR535  OPERATION AND MAINTENANCE MANUAL IB-67124-A

  +---------------------------------------------------------+
  |                                                         |XX
  |                                                         |XX J2
  |                                                         |XX
  |                                                         |XX
  |                                              SW2 8--+   |  1
  |                                                  |  |   |XX
  |                                                  |  |   |XX
  |                                                  |  |   |XX
  |                                                  |  |   |XX
  |                                                  1--+   |XX J1
  |                                              SW1 6--+   |XX
  |                                                  |  |   |XX
  |                                                  |  |   |XX
  |                                                  1--+   |XX
  |                                                         |  1
  |                                                         |XX J6
  |                                                         |XX Power
  +---------------------------------------------------------+  1



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                      J   U   M   P   E   R   S
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MITSUBI. MR535  OPERATION AND MAINTENANCE MANUAL IB-67124-A

 Jumper Setting
 ==============

 There are two switches on the main circuit board of this drive.


 SW1 Termination Switch
 ----------------------
        +-----------+
        |o o o o o o|ON
        |x x x x x x|OFF
        +1-2-3-4-5-6+
         +-+-+-+-+-+------- Termination Switch

 To provide termination for the last unit, al switches of SW1 should
 be set in the ON position. On all other units, all the switches of
 SW1 should be set in the OFF position.


 SW2  Drive Select
 -----------------
        +---------------+
        |x o o o x o o o|ON
        |o x x x o x x x|OFF
        +1-2-3-4-5-6-7-8+
         | | | | | | | +---  Set OFF position
         | | | | | | +-----  Set OFF position
         | | | | | +-------  Set OFF position
         | | | | +---------  RADIAL (R)
         | | | +-----------  Drive Select 1 (DS1)
         | | +-------------  Drive Select 2 (DS2)
         | +---------------  Drive Select 3 (DS3)
         +-----------------  Drive Select 4 (DS4)


 In multiple unit connection it is necessary to configure each drive
 with a unique address.

   +-----------+---------------------------+
   |   SW2     |Drive Select Configuration |
   +----+------+------+-----+----+---------+
   |Bit |*Mark |   1  |  2  |  3 |  4      |
   +----+------+------+-----+----+---------+
   | 1  | DS1  |   ON | OFF |OFF |OFF      |
   +----+------+------+-----+----+---------+
   | 2  | DS2  |   OFF| ON  |OFF |OFF      |
   +----+------+------+-----+----+---------+
   | 3  | DS3  |   OFF| OFF |ON  |OFF      |
   +----+------+------+-----+----+---------+
   | 4  | DS4  |   OFF| OFF |OFF |ON       |
   +----+------+------+-----+----+---------+
  *Mark is printed on Printed Circuit Board (PCB).


 The control cable allows for a daisy chain connection of up to four
 drives.

 The switch block has DRIVE SELECT switched off with the "radial"
 option selected. Each drive is shipped with the switch block marked
 "R" switched on, resulting in the daisy chain operation. In this
 case, input and output signals are enabled when the appropriate
 DRIVE SELECT line is activated.

 When the switch block marked "R" is switched off, all inout and out-
 put signals are enabled even if the drive is not selected.

 However, the front panel LED will not be on. DRIVE SELECT must be
 activate to light the LED.




 J6   DC Power and pin connector assignments
 -------------------------------------------
     +--------------+
     |+-----J3-----+|  pin 1    +12 VDC
     || 1  2  3  4 ||  pin 2    +12 VDC Return
     |+------------+|  pin 3    + 5 VDC Return
     +--------------+  pin 4    + 5 VDC



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MITSUBI. MR535  OPERATION AND MAINTENANCE MANUAL IB-67124-A

 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 drive may be installed in either a horizontal (spindle up) or
 vertical plane (on its left or right side).

 In any final mounting configuration, insure that the operation of the
 four shock mounts which isolate the base casting from the frame is
 not restricted.

 The drive dissipates approximately 18 watts during normal operation
 conditions. This dissipated heat must be removed by adequate
 ventilation from the enclosure at a rate that is sufficient to main-
 tain the ambient air temperature around the drive at or below 50*C
 (122*F). Cooling air is recommended for 6 cfm.
 (Screw: 4-M4x0.7 or 4-NO. 6-32 UNC)

 When the drive is inserted into the enclosure, 2.5mm (0.1 inch) and
 above clearance must be kept.


 Drive Connection
 ----------------
 Power must be removed when connecting or disconnecting cables!

 Connect the host controller's DC power cable to connector J6 and the
 signal cables to connectors J1 and J2.

 All control lines are digital in nature (open collector TTL) and
 either provide signals to the drive (input) or signals to the host
 controller (output).

 The data transfer signals are differential in nature and provide data
 either to (write) or from (read) the drive.


 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 PCB. A key slot is provided between pins 4 and 6.

 28 AWG Flat Cable
 Maximum Length 6m
 Mating Connector 3M 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 PCB. A key slot is provided between pins 4 and 6.

 28 AWG Flat Cable
 Maximum Length 6m
 Mating Connector 3M 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.

 18 AWG Cable
 Mating Connector AMP P/N 1-480424-0
 Utilizing Contacts AMP P/N 61473-1


 Frame Ground Connector
 ----------------------
 The frame ground connection is Faston type one, AMP P/N 61761-2. The
 recommended mating connector is AMP P/N 62187-1.


 Typical Cable Interconnection - 4 Drive System
 ----------------------------------------------
       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


 Auto Lock Mechanism
 -------------------
 Once power is removed from the system, the actuator will move the
 head stack to the landing zone, and the actuator lock will be enabled
 automatically.


 Disk Enclosure and Air Filtration System
 ----------------------------------------
 The HDA assembly is an air tight enclosure containing the actuator
 and spindle assembly. The enclosure seals out dust and noise to the
 HDA. A breather filter maintains circulation and clean air. Also, the
 breathing filter compensates for pressure differences between the
 outside ambient pressure and the internal pressure of the HDA.


 Frame and Shock Mount
 ---------------------
 The HDA is completely shock mounted to insure resistance to outside
 shock and vibration forces.


 Spindle
 -------
 The spindle and drive motor assembly are integrated into one unit, in
 order to maximize space. The rotation of the brushless DC motor is
 initiated by applying power to the drive. A rotational sensor located
 on the PCB maintains the 3600   0.5% rpm rate, anything greater/less
 than 0.5% and the power to the spindle will be shut off. The auto-
 matic brake is used to stop the spindle motor when the power is
 turned off, thus minimizing head wear.


 Seek to Shipping Zone
 ---------------------
 The drive is designed with a dedicated parking/shipping zone. When
 the power is removed from th edrive the heads are automatically
 parked and locked in the parking/shipping zone.



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                      F   E   A   T   U   R   E  S
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MITSUBI. MR535  OPERATION AND MAINTENANCE MANUAL IB-67124-A


 General Description
 -------------------
 The MR535 series disk drive is a high performance random access
 storage device with 5.25" (130mm) disks and closed-loop positioning
 system.

 The MR535 has an unformatted capacity of 50.85 Megabytes and employs
 three disks and six heads (one is a servo head).

 Key Design Features
 - Half Height 5.25" Winchester disk drive
 - MnZn ferrite Monolithic heads using Whitney mounting
 - Dedicated servo system
 - Voice coil motor
 - Low dust level enclosure with air circulation system
 - Simple electronics on one printed circuit board with customized
   LSI's
 - Dedicated head landing/shipping zones are provided for greater data
   protection.



 Seek Time
 ---------
       +----------------------------------+--------+
       |                                  | MR535  |
       +----------------------------------+--------+
       |Track-to-Track         msec. typ. |   5    |
       +----------------------------------+--------+
       |Average                msec. typ. |  28    |
       |                       msec. max. |  52    |
       +----------------------------------+--------+
       |Latency                msec. avg. |   8.33 |
       +----------------------------------+--------+


 Write Precompensation
 ---------------------
 When a particular data pattern is written, bit shifting due to the
 super-position 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 for nominal bit position is -
 12 ns (early) or +12 ns (late).

 In order to provide for a satisfactorily lower error rate for the
 drive, the host-system timing for MFM write data may be pre-compen-
 sated from 300 tracks.