M R 5 3 5 MITSUBISHI NO MORE PRODUCED 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 ********************************************************************** L A Y O U T ********************************************************************** 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 ********************************************************************** J U M P E R S ********************************************************************** 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 ********************************************************************** I N S T A L L ********************************************************************** 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. ********************************************************************** F E A T U R E S ********************************************************************** 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.