Scope - Fujitsu M255XK Customer Engineering Manual

1.1 SCOPE
SECTION 1
INTRODUCTION
This manual explains the service procedures for the FUJITSU M255XK Family of
51" Mini Flexible Disk Drives.
This Section gives an overview of the Disk Drives.
Section 2 provides specifications.
Section 3 explains the drive's operations
Section 4 details maintenance procedures
Section 5 contains parts lists and mechanical and schematic drawings.
1.2 GEI\ERAL DESCRIPTION
M255XK disk drives offer superior performance, reliability and construction in
Half-Height
5i"
Flexible Disk Drive technology.
Industry standard 51" (130mm) diskettes are used as the storage medium. These
drives have an independently addressed Read/Write head for each side of the
diskette.
FM (Frequency Modulation) or MFM (Modified Frequency Modulation) recording
methods are acceptable.
There are three Models in the M255XK Family:
M2552K - This model records 5,922 flux transitions per il1ch and has a per disk
unformatted storage capacity of 1 Mbyte with MFM Encoding or 500
Kbytes with FM Encoding.
With a 16 sector format (256 bytes per sector), the M2552K emulates a
double density/double sided, 96 track per inch 51" industry standard
disk drive.
M255JK - This model records 9,646 flux transitions per inch and has a per disk
unformatted storage capacity of 1.604 Mbytes with MFM Encording or
802 Kbytes with FM'Encording.
With a 15 sector format (512 bytes per sector) the M2553K emulates a
double density/double sided, 96 track per inch (1.2 MByte) industry
standard 51" disk drive.
M2554K - This model has a host system controlled interface line (pin-2) that
allows operation at either 300 RPM, or 360 RPM.
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