
M 2 2 4 3 T    FUJITSU
NO MORE PRODUCED                                      Native|  Translation
                                                      ------+-----+-----+-----
Form                 5.25"/HH              Cylinders    1186|     |     |
Capacity form/unform    68/   86 MB        Heads           7|     |     |
Seek time   / track  25.0/ 5.0 ms          Sector/track   32|     |     |
Controller           MFM / ST506           Precompensation 65535
Cache/Buffer               KB              Landing Zone
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 45    |    -40 60
Power: sleep              W     Humidity     %        20 80    |      5 95
       standby            W     Altitude    km            3.000|        12.000
       idle               W     Shock        g         2       |     20
       seek               W     Rotation   RPM      3600
       read/write    18.0 W     Acoustic   dBA        45
       spin-up            W     ECC        Bit
                                MTBF         h      30000
                                Warranty Month
Lift/Lock/Park     YES          Certificates                                  

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FUJITSU  M2243T/R  OEM MANUAL  41FH5014E-03

  +---------------------------------------------------------+
  |                                                         |XX B
  |                                                         |XX cable
  |                                                    8-+  |XX edge
  |                                        (Terminator)| |  |XX 20-pin
  |                                                SW2 | |  |XX
  |                                                    1-+  |
  |                                                    1-+  |XX A
  |                                                    | |  |XX cable
  |                                                SW1 | |  |XX edge
  |                                                    8-+  |XX 34-pin
  |                                                         |XX
  |                                                         |XX
  |                                                         |XX
  |                                                         |
  |                                                         |XX
  |                                                         |XX Power
  |                                                         |
  +---------------------------------------------------------+



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FUJITSU  M2243T/R  OEM MANUAL  41FH5014E-03

 Jumper setting
 ==============

 x = Jumpers are set at factory

 Should not operate hatched short plug switches other than SW1 and
 SW2.


 SW1  Drive selection
 --------------------
 Drive Number       1       2        3       4
 -------------------------------------------------
 x    1           CLOSED  OPEN     OPEN    OPEN
 -------------------------------------------------
      2           OPEN    CLOSED   OPEN    OPEN
 -------------------------------------------------
      3           OPEN    OPEN     CLOSED  OPEN
 -------------------------------------------------
      4           OPEN    OPEN     OPEN    CLOSED

 Plug 1 to 4 are used to select one of up to four drives. The relevant
 plug is to be set "CLOSED" while the others should be set "OPEN".


 SW1   Control of Drive Selected Signal
 --------------------------------------
     5     CLOSED   A drive is in a selected state regardless of
                    Drive Select 1 to 4, which means Drive Selected
                    signal is always true and all Input/Output signals
                    are validated without selecting the drive.
 x         OPEN     Drive Selected signal becomes true and all input/
                    output signals are validated only when a drive is
                    selected with Drive Select 1 to 4.


 SW1   Control of Motor On signal
 --------------------------------
     6     OPEN
     7     CLOSED   By the Motor On signal

 x   6     CLOSED
 x   7     OPEN     When the power-on

 x   8     CLOSED   Reserved

 Plugs 6 and 7 are used to select the DC motor starting either by the
 Motor On signal or not.




 SW2   Terminating the Control Signals
 -------------------------------------
 This switch is used to terminate the control signals. Keys 1 to 8 in
 SW2 of the last drive must be set to "ON" (in other drives, must be
 set to "OFF").

 x All keys are set to "ON".


 Power supply connector
 ----------------------
                         1 =  +12V
        +------------+   2 =  +12V Return
        | 4  3  2  1 |   3 =  + 5V Return
        +------------+   4 =  + 5V



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FUJITSU  M2243T/R  OEM MANUAL 41FH5014E-03

 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!
      Never install PC board on the Top!


 The drive may be installed in its locker either vertically or
 horizontally. The drive should not be positioned with the PCA on top.

 Ambient temperature
 -------------------
 The operating termperature range of the drive is specified at a
 distance of 3 cm from the drive.


 Cable connection
 ----------------
 The drive is interfaced to a system through four connectors.


 Connection
 ----------
 To connect two to four drives, the A cable (control signals) must be
 connected in series and the B cable (R/W signals) in parallel. The
 termination of control signals must be performed only at the last
 drive.

 +-------------+              +--------------+
 |             +-A-cable--*---+  Drive 1     +---------------------+
 |             +-B-cable--+---+              |                     |
 |             |          |   +--------------+                     |
 |             |          *---+  Drive 2     +-----------------+   |
 |             +-B-cable--+---+              |                 |   |
 | Controller  |          |   +--------------+                 |   |
 |             |          *---+  Drive 3     |                 |   |
 |             +-B-cable--+---+              +------------+    |   |
 |             |          |   +--------------+            |    |   |
 |             |          +---X  Drive 4     |            |    |   |
 |             +-B-cable------+              +--------+   |    |   |
 |             |              +--------------+        |   |    |   |
 +-------------+                                      |   |    |   |
 |             +-------Power-cable--------------------+   |    |   |
 |             |                                          |    |   |
 |             +-------Power-cable------------------------+    |   |
 | Power supply|                                               |   |
 |             +-------Power-cable-----------------------------+   |
 |             |                                                   |
 |             +-------Power-cable---------------------------------+
 +-------------+



 Frame structure
 ---------------
 The disk enclosure (signal ground) is electrically isolated from the
 drive mounting frame (frame ground). When mounting the drive in a
 cabinet frame, the frame should clear the drive by at least 3.5 mm
 to prevent the drive from touching the cabinet frame. An the locker
 frame should clear the drive upper and lower side at least 2.5 mm.
 In case of horizontally mount, do not mount the heating materials at
 drive lower side.


 Noise filter
 ------------
 To eliminate AC line noise, a noise filter of the specifications
 given below should be incorporated in the AC input terminal of the
 disk drive power supply.

 Attenuation characteristic: 40 dB or greater at 10MHz
 Circuit configuration:      T type



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FUJITSU  M2243R/T  OEM MANUAL 41FH5014E-03

 Media error
 -----------
 Cylinder 0 is defect free.
 The number of defect is 86 or less in the drive and the number of
 defects per one head is 25 or less.


 Mean Time Between Failures (MTBF)
 ---------------------------------
 The MTBFs of the drive during their life time are 30,000 hours
 estimated value after an initial period of 3-month.

 Failure of the equipment means failure that requires either repairs,
 adjustments, or replacement. Mishandling by the operator, failures
 due to bad environmental conditions, power trouble, controller
 trouble, cable failures, or other failures no caused by the equipment
 are not included.


 Mean Time To Repair
 -------------------
 MTTR is the average time taken by well-trained service mechanic to
 diagnose and repair a drive malfunction. The drive is designed for a
 MTTR of 30 minutes or less.


 Service life
 ------------
 Overhaul of the drive is not required for the first five years.


 Preventive Maintenance
 -----------------------
 Preventive Maintenance is unnecessary.


 Power loss
 ----------
 Integrity of the data on the disk is guranteed against all froms of
 abnormal DC power failure except a power failure during writing.


 DC Power
 --------
 The direct-drive DC motor requires no adjustment for line frequencies
 (50 Hz/60 Hz) or input power voltages (100, 115, 220 or 240 V).
 Power consumption: Steady state 18 W.


 Write Precompensation
 ---------------------
 Whenever two bits are written in close proximity to each other, a
 phenomenon called pulse superposition occurs, which tends to cause
 the two bits to move away from each other. This is a factor
 contributing to bit shift.

 The effect of bit shift can be reduced by a technique called pre-
 compensation, which, by detecting which bits will occur early and
 which bits will occur late, can effectivly minimize the shift by
 writing these bits in the opposite direction of the expected shift.

 M2243T...Performance without writeprecompensation is guranteed.
 M2243R...Precompensation had better done at 576 1185 cylinders. The
          optimum amount of precompensation is   7 nanoseconds.


 Spindle motor
 -------------
 The disks are turned by a direct-drive DC motor. The motor attains a
 very precise rotational speed of 3600 rpm,   1%. This precision in
 achieved through a feedback circuit which includes Hall-effect
 elements mounted within the motor assembly.

 Start and stop time
 -------------------
 Start time (time from when power is turned on until the unit is
 ready) is 20 seconds or less and stop time (time to completely stop
 when power is turned off) is 15 seconds or less using dynamic
 braking.


