M 3 2 1 2 P L U S MINISCRIBE
NO MORE PRODUCED Native| Translation
------+-----+-----+-----
Form 5.25"/HH Cylinders 612| | |
Capacity form/unform 10/ 12 MB Heads 2| | |
Seek time / track 85.0/15.0 ms Sector/track 17| | |
Controller MFM / ST506 Precompensation 128
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 4 50 | -40 57
Power: sleep W Humidity % 8 80 | 8 80
standby W Altitude km -0.061 3.048| 12.192
idle 14.5 W Shock g 4 | 40
seek W Rotation RPM 3600
read/write W Acoustic dBA 50
spin-up W ECC Bit
MTBF h 20000
Warranty Month
Lift/Lock/Park NO Certificates CSA,FCC,UL478
**********************************************************************
L A Y O U T
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MINISC. 3425/3212PLUS PRODUCT MANUAL P/N 1008 REV. H, MAY 6, 1987
+-------------------------------------------------------+
| |XX Power
| |XX
| |
| |XX
| |XX Control
| |XX Cable
| |XX J1
| |XX
| |XX
| TERMXX
| +-8 ++|
| DIP| | |||XX
| | | |||XX
| | | |||XX
| | | |||XX Data
| | | |||XX Cable
| +-1 RP1XX J2
+-------------------------------------------------------+
**********************************************************************
J U M P E R S
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MINISC. 3425/3212PLUS PRODUCT MANUAL P/N 1008 REV. H, MAY 6, 1987
Jumper Setting
==============
Drive Selection Configuration
-----------------------------
Drive Select No. 1 2 3 4 5 6 7 8
| 1 | 2 | 3 | 4 +---------------+
----+------+------+------+------ ON |x x x x x x x x|
SW8 |CLOSED|OPEN |OPEN |OPEN OFF+---------------+
SW7 |OPEN |CLOSED|OPEN |OPEN xxxxxxxxxxxxxxx RP1
SW6 |OPEN |OPEN |CLOSED|OPEN Terminator
SW5 |OPEN |OPEN |OPEN |CLOSED
As shipped, the DIP switch has Drive 1 selected (SW8 CLOSED).
Drive Exercise Options
----------------------
As shipped, the DIP switch has SW2, SW3, and SW4 closed. These
switches are for factory test modes and must remain closed for normal
operation.
Actuator Exerciser Modes
------------------------
The microprocessor performs "wake up" diagnostics upon application of
power. If an error is detected, the processor will flash a warning by
blinking the Activity LED. Some errors are fatal that they do not
return to the program until power is cycled.
If no errors are detected, the processor tests the shunt block to
determine the state of SW2, SW3, and SW4 (Drive Exercise Options).
Actuator Exerciser Modes:
SW2 SW3 SW4
CLOSED CLOSED X Normal Operation
CLOSED OPEN X Factory Use Only
OPEN CLOSED OPEN Random Seek (burn-in mode)
OPEN CLOSED CLOSED Random Seek
OPEN OPEN OPEN Cresendo Seek (burn-in mode)
OPEN OPEN CLOSED Cresendo Seek
Terminators
-----------
Each drive is shipped with a terminator pack providing the 220/330
ohm termination for the Control Input Signals. If multiple drives are
configured in a daisy chain configuration, the terminator pack must
be removed from all drives except the last unit on the daisy chain.
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I N S T A L L
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MINISC. 3425/3212PLUS PRODUCT MANUAL 1008 REV. H, MAY 6, 1987
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!
Recommended Mounting Configuration
----------------------------------
The MiniScribe 3425/3212P half height drive is designed to be used in
applications where the unit may experience shock and vibrations at
greater levels than larger and heavier disk drives.
Two features which allow greater shock tolerances are the use of
rugged media and shock mounts. To take full advantage of the shock
mounts, however, it is necessary to provide a 0.1 inch clearance on
both the top and bottom of the drive. This clearance allows for move-
ment of the drive during acceleration. This implies that if the drive
is mounted by the bottom mounting holes on a flat surface, stands-off
are needed under the mounting holes. No special considerations are
required if the drive is mounted using the side mounts except for the
clearance on top and bottom. The drive may be mounted in any attitude
except upside down.
The drive is mounted using 6-32 UNC screws, 1/4 inch maximum
penetration. The customer should allow adequate ventilation to the
drive to insure reliable drive operation over the operating
temperature range.
Screws: 6-32 UNC
Mechanically Isolated Mounting Points
-------------------------------------
Four side mounting and four base mounting points are provided to the
customer. Each mounting point is mechanically isolated from the
drive. Additionally, four side mounting points are provided that are
compatible with a half height floppy disk drive.
Cabling
-------
Connect interface cables with connectors P1, P2, P3, and P4 to J1,
J2, J3, and J4 respectively. Insure that connectors P1 and P2 have
keys installed. If multiple drives are be interconnected, remove the
terminator packs in all but the last drive in the daisy chain.
Magnetic Field
--------------
The externally induced magnetic flux density may not exceed 3 Gauss
as measured at the disk surface.
Drive Mechanism
---------------
A brushless DC direct drive motor rotates the spindle at 3600 rpm.
The motor/spindle assembly is dynamically balanced to provide minimal
mechanical runout to the disks. A dynamic brake is used to provide a
fast stop to the spindle motor when power is removed.
Air Filtration System
---------------------
Within the sealed enclosure, a 0.3 micron filter coupled with a
breather filter provides over the drive life a clean environment to
the heads and disks.
Head Positioning Mechanism
--------------------------
Two or four read/write heads are supported by a carriage mechaism
coupled to the stepper motor through a rack-and-pinion motion
translator. The rack-and-pinion translator allows for the increased
number of data tracks while retaining the full step holding torque
and positioning repeatability characteristics of the stepper motor.
Power Sequencing
----------------
+5 volts DC and +12 volts DC may be applied in any order.
+12 VDC powers the spindle drive motor. The microprocessor verifies
that the disks are spinning at 3600 rpm and then activates the
automatic Track Zero positioning. -TRACK ZERO, -SEEK COMPLETE, and
-READY will beome true upon completion of the Track Zero positioning
sequence.
Electrical Interface
--------------------
The interface to the MiniScribe 3425/3212P can be divided into three
categories, each of which are physically separated: Comtrol Signals,
Data Signals and DC Power.
All Control Signals are digital in nature (open collector TTL) and
either provide signals to the drive (input) or signals to the
controller (output). The Data Signals are differential in nature and
provide data either to (write) or from (read) the drive.
The interconnect cable between the drive and controller may be flat
ribbon or twisted pairs of a length not to exceed 20 feet. The signal
return lines and ground lines for P1 and P2 should be grounded at the
controller.
The voltage return lines of P3 should only be grounded at the power
supply.
Connector P4 is a spade lug connector tied to frame ground.
Cable Interconnection - 4 Drive System
--------------------------------------
HOST
+-----------+ +-----------------+
| +---o---Control------------------+P1 Drive 1 |
| | | +-------Data------------+P2 |
| | | | +-Power---+P3 P4 ... |
| | | | | +-----+-----------+
| | | | | +-Frame----+
| | | | | | +-----------------+
|Controller | o----+-------------+----+----+P1 Drive 2 |
| | | | +-----------+----+----+P2 |
| | | | | o----+----+P3 P4 ... |
| | | | | | | +----+------------+
| | | | | | o---------+
| | | | | | | +-----------------+
+-----------+ o----+-+-----------+----+----+P1 Drive 3 |
| | | | | +---------+----+----+P2 |
| +---+----+ | | o----+----+P3 P4 ... |
| +---+------+ | | | +-----+-----------+
| | | | | o----------+
|Data +---+--------+ | | +-----------------+
|Separator | +------------------+----+----+P1 Drive 4 |
| +----------------------+----+----+P2 |
| | o----+----+P3 P4 XXX |
+-----------+ | | +-----+-----------+
DC voltages----+ o----------+
|
Frame Ground--------+
... = Terminator Pack removed
XXX = Terminator Pack installed
P1 Connector - Control Signals
------------------------------
Connection to P1 is through a 34 pin PCB edge connector. The pins are
numbered 1 through 34 with the odd pins located on the componet side
of the printed circuit board. A key slot is provided betweeen pins 4
and 6.
The recommended mating connector (J1) is AMP Ribbon Connector, P/N
88373-3.
P2 Connector - Data Signals
---------------------------
Connection to P2 is through a 20 pin edge connector. The pins are
numbered 1 through 20 with the odd pins located on the component side
of the Printed Circuit Board. A key slot is provided between pins 4
and 6.
The recommended mating connector (J2) is AMP Ribbon Connector, P/N
88373-6.
P3 Connector - DC Power
-----------------------
DC power connector (P3) is a 4 pin AMP Mate-N-Lok connector, mounted
on the PCB. The P3 connector is mounted on the component side of the
PCB.
The recommended mating connector (J3) is AMP P/N 1-480424-0 utilizing
AMP pins P/N 350078-4.
+-----P3-----+ pin 1 +12 VDC
| 4 3 2 1 | pin 2 +12 Ground Return
+------------+ pin 3 + 5 Ground Return
pin 4 + 5 VDC
P4 Connector - Frame Ground
---------------------------
Fasten AMP P/N 61761-2.
The recommended mating connector (J4) is AMP 62187-1.
If used, the hole in P4 will accommodate a wire size of 18 AWG
maximum.
Caution/Warning
---------------
The Miniscribe drive is a precision product weighing 3.5 pounds.
During handling the unit must not be dropped, jarred or bumped.
Otherwise, damage to the heads and disks may occur. When the drive is
removed from the Miniscribe shipping container and not immediately
secured within a chassis through its shock mounts, it must be stored
on a soft padded surface.
Failure to comply with the above procedure will render null and void
all warranties.
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F E A T U R E S
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MINISC. 3425/3212PLUS PRODUCT MANUAL P/N 1008 REV. H, MAY 6, 1987
Introduction
------------
The MiniScribe 3425/3212P is a half-height random access 5-1/4 inch
rigid media disk drive employing Winchester technology. The drive
utilizes a rack-and-pinion actuator, microprocessor control, and open
loop stepper head positioning.
The Model 3425/3212P features power up diagnostics, buffered seek and
5 Megabit/Sec. transfer rate. D.C. voltages and physical form factor
are the same as the 5-1/4 inch half height floppy disk drive.
Seek Time (including settling time)
-----------------------------------
+----------------------------------+--------+
|Track-to-Track msec. typ. | 15 |
+----------------------------------+--------+
|Average msec. typ. | 85 |
| msec. max. | 190 |
+----------------------------------+--------+
|Latency msec. avg. | 8.33 |
+----------------------------------+--------+
Track Zero Detector
-------------------
The Track Zero Detector resides on the stepper motor. This optical
sensor consists of a light source (activated only when a seek is
initiated) and a receiver which when blocked by an interrupter on the
motor shaft indicates one of several logical Track Zero positions.
The microprocessor determines the physical location of Track Zero
from the redundant logical Track Zeros.
Media Defect Criteria (as shipped from MiniScribe)
--------------------------------------------------
Model 3425 30 defects maximum per drive
10 defects maximum per surface
Model 3212P 20 defects maximum per drive
Defects < 2 bytes in length
Defects may be continguous
Cylinder Zero Defect Free for
both models.
Error Messages
--------------
The microprocessor performs wake up diagnostics on power up.
Additionally, some operations are monitored during normal operations.
If an error is detected, the microprocessor will flash a warning by
blinking the activity LED.
Error codes may be generated by the microprocessor to indicate hard-
ware failures or warnings that are detected during power-on
diagnostics, burn-in mode, or normal operation. Error codes are
diaplayed in a "morse-code" type manner. Bits may be interpreted
and converted into hexadecimal error codes. "Zeros" are indicated by
a short (1/2 second) flashingn mode. "Ones" are indicated by a short
(1/2 second) continuous ON mode. Error "Words" are separated by a one
second LED off time.
Zero = 0.5 second flashing mode
One = 0.5 second continuous ON mode
Between Bits = 0.5 second Off
Between Repeat Cycles = 1.0 second Off
Listed Below are the binary to hexadecimal conversion values:
0 = 0000 4 = 0100 8 = 1000 C = 1100
1 = 0001 5 = 0101 9 = 1001 D = 1101
2 = 0010 6 = 0110 A = 1010 E = 1110
3 = 0011 7 = 0111 B = 1011 F = 1111
Message Definitions
-------------------
Code 0 - Microprocessor RAM error
Code 1 - Microprocessor ROM checksum error
Code 2 - Interface chip diagnostic failure
Code 3 - Write Fault latch will not reset
Code 4 - Index pulse not detected during spinup
Code 5 - Unable to reach 3600 rpm in 30 seconds
Code 6 - Unable to stabilize spin speed in 10 seconds
Code 7 - Unable to maintain spin speed to 0.5%
Code 8 - Unable to uncover Track Zero sensor
Code 9 - Unable to cover Track Zero sensor
Code A - Track Zero interrupter misadjusted
Code B - Shipping zone error, crash stop misadjusted
Code C - Carriage stuck during recal error
Code D - Seek errror during burn-in or recal
Code E - Unused
Code F - Unexpected interrupt from processor
