SECTION IV
THEORY
OF
OPERATION
4.1
INTRODUCTION
This section provides a description of the 03000 Disk Drive theory of operation.
The disk drive consists of the mechanical and electrical components necessary to
read
and
record digital data
on
a magnetic disk.
The
disk drive consists of the following major
groups.
(1)
Main chassis group
(2)
Positioner assembly
(3)
Power supply assembly
(4)
Read/Write
PCBA
(5)
Servo
PCBA
(6)
Logic PCBA
(7)
Temperature Compensation
PCBA
(200
tpl)
4.2 ORGANIZATION OF THE DISK DRIVE
Figure
4-1
is a block diagram illustrating the overall organization
of
the disk drive. This
organization can
be
subdivided into the mechanical and the electrical/electronics group.
The mechanical group
can
be
further divided into the main chassis group and the
positioner assembly group.
4.2.1
MAIN CHASSIS
GROUP
The
main chassis group consists
of
the following components
and
assemblies.
(1)
Base casting
(2)
Air system filter and blower
(3)
Spindle assembly
(4)
Drive motor
(5)
Drive train components
(6)
Cartridge adapter (top load models)
m Receiver assembly (front load models)
(8)
Disk cover (top load models)
(9)
Lower disk cover (front load models)
(10)
Bezel
assembly
(11)
Dust cover
(12)
Control switch
and
indicator group
The main mechanical element of the disk drive is the base casting. This casting is a
machined aluminum
alloy casting which is the supporting structure for all of the
components in the disk drive. When rack mounting the disk drive, the rack mounting
slides
are
mounted directly to the sides of the base casting. This provides a means of
sliding the unit in and out of rack installations.
4-1
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