M 8 2 2 5 MINISCRIBE NO MORE PRODUCED Native| Translation ------+-----+-----+----- Form 3.5"/HH Cylinders 771| | | Capacity form/unform 20/ 24 MB Heads 2| | | Seek time / track 68.0/15.0 ms Sector/track 26| | | Controller RLL / ST412 Precompensation Cache/Buffer KB Landing Zone 770 Data transfer rate 0.938 MB/S int Bytes/Sector 512 0.938 MB/S ext Recording method RLL 2/7 operating | non-operating -------------+-------------- Supply voltage 5/12 V Temperature *C 4 50 | -40 60 Power: sleep W Humidity % 8 80 | 5 95 standby 7.0 W Altitude km -0.061 3.048| 12.192 idle 13.0 W Shock g 10 | 50 seek W Rotation RPM 3600 read/write W Acoustic dBA 45 spin-up W ECC Bit MTBF h 30000 Warranty Month Lift/Lock/Park YES Certificates FCC ********************************************************************** L A Y O U T ********************************************************************** MINISC. 8225 PRODUCT MANUAL P/N 1121 REV. A, FEB. 16, 1989 +---------------------------------------------------------+ | |XX | +-SEL1 |XX | | | |XX P2 | | | |XX | +J15+-+ |XX | ++ | | +J13 |XX ++ LED ++ |XX ++ ++ |XX P1 | RP1|| |XX | Terminator|| |XX | || |XX | ++ ++ |XX | |J12 |XX | ++ |XX | | +--------------------------------------------------xxxxxx-+ Power xxxxxx ********************************************************************** J U M P E R S ********************************************************************** MINISC. 8225 PRODUCT MANUAL P/N 1121 REV. A, FEB. 16, 1989 Jumper Setting ============== Drive Select ------------ As shipped, the drive is preselected for drive select address 1. To change to another address, the two position jumper located in row of the SEL 1 header must be repositioned to one of the other three rows corresponding to the desired drive select number. Row 1, correspond- ing with Drive Select 1, is the topmost row when the interconnected column of pins is on the right. SEL1 SEL1 SEL1 SEL1 +---+ +---+ +---+ +---+ 1 |xxx| 1|O O| 1|O O| 1|O O| 2 |O O| 2|xxx| 2|O O| 2|O O| 3 |O O| 3|O O| 3|xxx| 3|O O| 4 |O O| 4|O O| 4|O O| 4|xxx| +---+ +---+ +---+ +---+ Drive 1 Drive 2 Drive 3 Drive 4 As shipped by MiniScribe with Drive Select 1 selected. Drive Exercise/Head Park Option ------------------------------- When power is first applied, the drive performs power-on diagnostics. After the diagnostics, the status of jumper 13 is checked. It is open, the normal drive ready mode is entered. If jumper 13 is closed (jumpered), the drive enters the exercise mode where crescendo seeks are performed continually until power is removed. Any seek or spin failure occurring during this mode causes the drive diagnostic LED to flash a code indicating the type of failure. To park the heads, remove power and place a jumper in J13. Apply power. The heads will rezero (go to cylinder 0) and then to the shipping zone at cylinder 810 when power is removed. Remove the jumper immediately. Low Power/Head Park Option -------------------------- The jumper in J15 removed enables the low power option. With this option, whenever the drive has not been selected for 30 seconds the head assembly is automatically moved to the shipping cylinder (810) and current is removed from the stepper motor. In this mode the drive power consumption is reduced to 7 watts. Should power be removed from the drive at this point, the heads will land in the shipping zone. If power is not removed, the heads will remain over the shipping cylinder until told to go to the cylinder indicated by the next Read or Write command. 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. Diagnostic and Exercise Routines -------------------------------- 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 in that they do not return to the program until power is cycled. If no errors are detected, the processor tests Jumper 13 to determine its state (open or closed). Briefly, Jumper 13 (Drive Exercise Options) is as follows: The jumper is left open for normal (online) operations. If the jumper is closed, (and left closed) a burn-in (cresendo seeks) program will be run. If the jumper is closed and opened during the code level display, the sensor adjust routine is initiated. Power-up sequence of events is as follows: 1. Apply power 2. The microprocessor runs power on diagnostics and then allows motor spin up. 3. Test Jumper 13. If open, go to normal operation. If closed, continue to Step 4. 4. Display code level (5 bits), e.g. 00001 5. Test Jumper 13. If still closed, continue in cresendo seek exerciser mode. If open, run Track Zero sensor adjust. 6. Recalibrate access, then seek to maximum cylinder. 7. The LED will display seven zero's (flash code). At this time the heads are located over the shipping zone. If power is removed, the heads will land in the shipping zone. 8. If the test is continued the drive will perform a seek to cylinder four, (test for seek error) and then seek to cylinder zero. 9. At this point the sequential seek burn-in will begin. ********************************************************************** I N S T A L L ********************************************************************** MINISC. 8225 PRODUCT MANUAL P/N 1121 REV. A, FEB. 16, 1989 Notes on Installation ===================== Installation direction ---------------------- horizontally vertically +-----------------+ +--+ +--+ | | | +-----+ +-----+ | | | | | | | | | +-+-----------------+-+ | | | | | | +---------------------+ | | | | | | | | | | | | | | | | | | +---------------------+ | +-----+ +-----+ | +-+-----------------+-+ +--+ +--+ | | | | +-----------------+ Recommended Mounting Configuration ---------------------------------- The MiniScribe 8225 3 1/2 inch size 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. The drive may be mounted in any attitude. The drive is mounted using 6-32 screws, 1/8 inch maximum penetration. The customer should allow adequate ventilation for the drive to ensure reliable drive operation over the operating temperature range. 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 head- disk assembly. Cabling ------- Connect interface cables with connectors P1, P2, and P3 to J1, J2, and J3 respetively. 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, above atmospheric pressure environment to the heads and disks. Head Positioning Mechanism -------------------------- Two read/write heads on the drive are supported by a carriage mechaism coupled to the stepper motor through a rack-and-pinion motion translator. Read/Write Heads and Disks -------------------------- Data is recorded on one (1) 95 mm diameter disk through two (2) Mini- Winchester type composite heads. 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 8225 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. Cable Interconnection - 4 Drive System -------------------------------------- HOST +-----------+ +-----------------+ | +---o---Control------------------+P1 Drive 1 | | | | +-------Data------------+P2 | | | | | +-Power---+P3 ... | | | | | | +-----------------+ | | | | | +-----------------+ |Controller | o----+-------------+---------+P1 Drive 2 | | | | | +-----------+---------+P2 | | | | | | o---------+P3 ... | | | | | | | +-----------------+ | | | | | | +-----------------+ +-----------+ o----+-+-----------+---------+P1 Drive 3 | | | | | | +---------+---------+P2 | | +---+----+ | | o---------+P3 ... | | +---+------+ | | +-----------------+ |Data +---+--------+ | +-----------------+ |Separator | +------------------+---------+P1 Drive 4 | | +----------------------+---------+P2 | | | o---------+P3 XXX | +-----------+ | +-----------------+ DC voltages----+ ... = 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 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 Caution/Warning --------------- The Miniscribe drive is a precision product weighing 1.8 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. When removing the PCBA, a grounded wirst strap must be worn to prevent esd damage. ********************************************************************** F E A T U R E S ********************************************************************** MINISC. 8225 PRODUCT MANUAL P/N 1121 REV. A, FEBRUARY 16, 1989 Introduction ------------ The MiniScribe 8225 is a half-height reandom access 95 mm 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 8225 features power up diagnostics, buffered seek and 7.5 Megabit/Sec. transfer rate. D.C. voltages and physical form factor are the same as the 3-1/2 inch half height floppy disk drive. Seek Time (including settling time) ----------------------------------- +----------------------------------+--------+ | | 8225 | +----------------------------------+--------+ |Track-to-Track msec. typ. | 15 | +----------------------------------+--------+ |Average msec. typ. | 68 | | msec. max. | 152 | +----------------------------------+--------+ |Latency msec. avg. | 8.33 | +----------------------------------+--------+ Media Defect Criteria (as shipped from MiniScribe) -------------------------------------------------- Model 8225 10 defects surface/maximum 20 defects maximum Cylinder Zero and One Defect Free 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 - No hall transitions during spin-up Code F - Unexpected interrupt from processor Track Accessing --------------- A seek to cylinder 810 will position the read/write heads over the shipping zone. A seek to a higher cylinder than 810 will cause a recalibration sequence in the drive, which will position the read/write heads at Track Zero.