
6 1 8 6    BASF MAGNETICS
NO MORE PRODUCED                                      Native|  Translation
                                                      ------+-----+-----+-----
Form                 5.25"/FH              Cylinders     440|     |     |
Capacity form/unform    14/   18 MB        Heads           4|     |     |
Seek time   / track  99.9/15.0 ms          Sector/track   32|     |     |
Controller           MFM / ST412           Precompensation   128
Cache/Buffer               KB              Landing Zone      439
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         4 50    |
Power: sleep              W     Humidity     %        15 80    |
       standby            W     Altitude    km                 |
       idle               W     Shock        g                 |
       seek               W     Rotation   RPM      3600
       read/write    18.0 W     Acoustic   dBA
       spin-up            W     ECC        Bit   -
                                MTBF         h      11000
                                Warranty Month
Lift/Lock/Park     NO           Certificates


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BASF     6186  TECHNICAL MANUAL

                                    +-----------------------+
                               P61  |           +-------+   |XXX J3
  +------------------------------++-+           |LM339  +   |XXX Power
  |                             ++++            +-------+   |XXX
  |                             +--+                        |
  |                                    Option Switch        |XXX
  |                                     +------------+      |XXX
  |                                     |++++++++++++|      |XXX J1
  |                                     |++++++++++++|      |XXX
  |                                     +-----------1+ +-+  |XXX
  |                                  +-------------+   +-+  |XXX
  |                                  |898-5-220/330| Option |+-+
  |                                  |1F Terminator+ Ground || | J5
  |                                  +-------------+        |+-+
  |                                                         |XXX
  |                                                         |XXX J2
  |                                                         |XXX
  |                                                         |XXX
  +---------------------------------------------------------+



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BASF     6186  TECHNICAL MANUAL

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

 User selectable options
 -----------------------
             +-----+
            1|xxxxx| Drive Select 1
            2|xxxxx| Drive Select 2
            3|xxxxx| Drive Select 3
            4|xxxxx| Drive Select 4
            5|xxxxx| PERM SEL D
            6|xxxxx| MTR ON by power on
             +-----+

 The BASF 6186 has 6 switches for user selection of different drive
 options/configuration. The switches are contained in a DIP switch
 pack. Switch number 1 is the one closest to connector J1. The ON
 position of the switches is marked on the switch housing.


 Termination
 -----------
 All signal lines must be properly terminated as defined in the BASF
 6180 Product specification. For signal from the host controller to
 the drive all necessary termination is provided on the Read-Write-
 Control PCB.

 Termination for the "A"-cable control lines is contained in a DIP-
 resistor-pack mounted in a socket at location 2F of the Read-Write-
 Control PCB. In drives shipped from the factory the resistor pack is
 always installed. It must be removed in daisy-chain configuration
 from all but the physically last drive connected to the "A"-cable.
 Systems with a single drive or with multiple drives connected in the
 radial mode must have the resistor pack installed in all drives.


 Grounding
 ---------
 Grounding of the drive is normally achieved through the ground lines
 of the signal and power cables. Additional ground of the HDA can be
 provided through the Frame Ground connector J4. The recommended
 mating connector for J4 is AMP P/N 62187-1 or equivalent. The HDA is
 normally electrically connected to logic ground through a printed
 connection JJ2 at location 1G on the Reas-Write-Control PCB close to
 the option switches. This trace should be removed when using J4 in
 order to avoid ground loops.

 The mounting frame is isolated by the rubber shock absorbers from the
 HDA.


 Drive Address Selection
 -----------------------
 Switches 1 to 4 are use to set the drive address for drive selection.
 Only one of the four switches may be set to the ON position. This
 switch determines which one of the four interface drive select lines
 selects this particular drive. If for instance, in a given drive,
 switch 1 is ON (switches 2 to 4 of the drive must be OFF) that drive
 is selected whenever the signal DR SEL 1 is low active.

 The drive address assignment us indepentend of the drive's position
 on the daisy-chained "A"-cable.


 Spindle Motor Start Control
 ---------------------------
 Switch 6 controls the condition for the spindle motor start.

 If switch 6 is ON the spindle motor is started as soon as power is
 provided to the drive.

 If switch 6 is OFF the spindle motor does NOT start with power on. It
 starts, however, with the first low active going edge of the drive
 select signal corresponding to that drive. This feature allows
 sequencing of the motor start in multiple drive configurations in
 order to reduce the total load to the power supply caused by the high
 current during the spindle motor start.


 Automatic Rezero
 ----------------
 The drive performs an automatic rezero operation after power is
 provided to the drive and the spindle motor is up to full speed.
 (Note that the spindle motor may not start before the first selection
 if switch 6 is OFF.) The interface READY signal goes low active after
 the automatic rezero is completed. The interface Seek Complete signal
 goes high inactive during the rezero operation.


 Permanent Selection
 -------------------
 If switch 5 is in ON position, the drive is permanently selected.
 This means that the drive responds to the interface control lines
 independent of the status of the four interface drive select signals.
 Nevertheless one of the four address switches S1 to S4 (normally S1)
 should be set to the ON position. It is only turned on when the
 interface drive select signal corresponding to the address of that
 drive is active.

 Permanent selection may not be used in a daisy-chain configuration
 because two or more drives would respond to the same interface
 commands.

 If switch 5 is in the OFF position, selection of the drive is under
 control of one of the four interface drive select lines according to
 the setting of switches 1 to 4.



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BASF     6186  TECHNICAL MANUAL

 Notes on Installation
 =====================

 Installation direction
 ----------------------

     horizontally                           vertically
 +---------------------+           +--+                       +--+
 +-+                 +-+           |  +-----+           +-----+  |
   |                 |             |  |     |           |     |  |
   |                 |             |  |     |           |     |  |
   +-----------------+             |  |     |           |     |  |
                                   |  |     |           |     |  |
                                   |  |     |           |     |  |
                                   |  +-----+           +-----+  |
                                   +--+                       +--+


 Mounting
 --------
 There is a total of eight mounting holes in the mounting frame, four
 in the bottom and two on either side. All mounting holes have M3
 threads (metric 3mm diameter).

 The BASF 6186 may be mounted in three different orientations. When
 locking at the face plate the Read-Write-Control PCB may either be on
 top, on the right side or on the left side of the drive. The maximum
 angle for the drive mounting from the horizontal level is 13 degrees.

 The following general recommendations for mounting the drive in a
 system should be observed.

 - The drive should be mounted with four screws, either to the four
   bottom mounting holes or to the four mounting holes on the two
   sides.

 - A clearance of at least 4 millimeters should be provided in all
   directions around the HDA. This space is required to allow the HDA
   to swing on the shock absorbers if the system is exposed to
   external vibrations or shocks.

 - The mounting of the drive must allow sufficient air flow for its
   cooling. The environmental temperature specified for the drive
   refers to the air directly surrounding the drive. This value (50
   degr. C) must not be exceeded under any operating condition or
   temperature outside of the system.

 - If the drive is mounted close to devices which radiate a very high
   level of electrical noise (such as switched mode power supplies,
   CRT displays etc.) it may be advisable to provide a shielding be-
   tween those devices and the disk drive.



 Initial power on
 ----------------
 This section gives a recommendation for a setup and checkout
 procedure when powering up a drive for the first time after shipment.
 In multi drive configuration it is recommended to check each drive
 individually.

 - Set the option switches as follows:

    1 - 5 OFF
    6     ON

 - Install or remove the terminator pack as required.

 - Verify that the connectors of all interconnect cables in the drive
   are firmly seated.

 - Mount the drive in the system. If the drive is tested outside the
   system, make sure that the recommended mounting orientations are
   still met.

 - Verify that the interface signal and power cables are correctly
   wired. (Reserving of the two power supply voltages would cause
   severe damage to the drive.)

 - Connect the interface signal and power cable. If interface cables
   without polarization keys are used, verify that the interface
   connectors are installed in the correct orientation.

 - Remove the adhesive tape from the spindle motor.

 - Provide power to the drive. Watch that the brake is disengaging and
   the spindle motor is starting to rotate. Wait until the spindle
   motor has reached full speed.

 - Watch that the drive performs the automatic rezero after the
   spindle is at full speed.

 - Turn power off, watch that the brake is engaging.

 - Set the option switches as required for normal system operation.

 - Perform a normal system power on procedure.


 Connecting Cables
 -----------------
 The BASF 6186 is connected to the host by three cables. There are two
 signal cables and one power cable. The two signal cables are called
 "A"-cable and "B"-cable. An optional fourth cable may be used for
 frame ground connection.

 The "A"-cable has 34 lines and is used for transfer of control and
 status information. It may be a flat ribbon or twisted pair cable
 with a maximum total length of 20 feet. If more that one drive is
 attached to the system, the "A"-cable may be connected either in
 daisy-chain or radial configuration.

 The "B"-cable has 20 lines and is mainly used for transfer of read/
 write information. It is recommended to use twisted pair cables for
 the "B"-cable, especially if its exceeds 1 meter (3 feet). The "B"-
 cable is always connected in radial mode. The maximum length of each
 "B"-cable is 6 meters (20 feet).

 The power cable should always be connected in radial mode in order to
 minimize voltage drop across the cable. Wire size and cable length
 must be determined such that the supply voltage specifications are
 met at the drive power connector under all operating conditions.


 Connectors
 ----------
 The "A"-cable is connected through 34 pin connector J1 to the drive.
 The recommended mating connector is AMP P/N 88373-3 or equivalent.

 The "B"-cable is connected through the 20 pin connector J2 to the
 drive. The recommended mating connector is AMP P/N 88373-6 or
 equivalent.

 The power cable is connected through th e4 pin connector J3 to the
 drive. The recommended mating connector is AMP P/N 1-480424-0 with
 pins P/N 350078-4 or equivalent.
   /-+
  | 1| +12V DC
  | 2| GND 12V
  | 3| GND 5V
  | 4| +5V DC
   \-+



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BASF     6185/6  TECHNICAL MANUAL 80307-069 JULY 1984



 Model and Operation
 -------------------
 The BASF 6185 is a 5.25" Fixed Disk Drive with a capacity of 27.5
 MBytes unformatted. It has 3 disks and 6 magnetic heads. The model
 6186 has the same technology as the 685 with the difference being
 there are 2 disks and 4 magnetic heads achieving a capacity of 18.3
 MBytes. All references to model 6185 also apply to model 6186.


