830D
Also,
on
front load models, a lower disk cover is fitted which supports the magnetic
transducer
and
photo-electric sensor pickups
and
provides a covering for the lower disk in
dual disk machines.
The
analogous component in top load models is the disk cover which
is
an
aluminum alloy separator mounted
in
the cartridge adapter, just
above
the lower disk
area.
The
bezel
assembly provides the decorative trim at the front of the disk drive
and
a
suitable cover for the air system intake.
In
addition, for front load models only, the
mounting arrangement for the door
and
the link arms provide the cammlng action for the
receiver.
A dust cover, consisting
of
formed metal, is used to cover the disk drive and protect it from
contamination. This cover
Is held
In
place by machine screws on both top
and
front load
models. The cover directs the air flow through the Interior of the drive.
The
ON/OFF power switch, RUN/STOP switch,
and
the Indicators
are
mounted to the
base
casting by the
use
of
a bracket located directly behind the bezel.
The
bezel,
on
top
load models,
may
be
removed without disturbing the operator switches or the wiring since
there is
no
mechanical connection between the
bezel
and
the switch bracket.
4.2.2
POSITIONER
ASSEMBLY
The
positioner assembly is a separate modular unit that
Is
mounted
on
a base casting.
Also mounted
on
the
base
casting are the positioner magnet structure,
and
the shaft for
supporting the carriage.
The
carriage is supported
on
a bearing structure riding
on
this
shaft.
The
read/write heads
are
mounted into the carriage.
Also attached to the carriage is the positioner coli. This arrangement of magnet
and
coil
provide a linear motor actuator for positioning the read/write heads. This type
of
arrangement is also referred to
as
a voice coil positioner. Carriage velocity Is sensed using
a velocity transducer consisting
of
a magnet within a specially wound coil.
The
transducer
is mounted
on
the positioner
base
plate
and
the magnet is attached to a shaft connected to
the carriage.
The
position of the carriage is detected
and
sensed using a photoelectric
position transducer which is attached to the positioner
base
plate by a mounting strip.
The
200
tpi models
have
a temperature senSing element mounted
on
the positioner base
plate. This thermistor is part of the temperature compensation Circuitry included in
200
tpi
models.
4.2.3
POWER
SUPPLY
ASSEMBLY
The
power supply assembly is a major subassembly which mounts to the underside of the
base
casting
and
contains the power transformer. rectifiers,
and
filter capacitors. Also
located
on
the power supply assembly is the Motor Control
PCBA
and
the motor start
capacitors.
4.2.4 READ/WRITE.
SERVO,
AND
LOGIC
PCBAS
The
partitioning of the electronics system is primarily functional; the three major PCBAs,
in
many ways. constitute the major partitioning
of
the 03000 electronics. These PCBAs
are
the Read/Write
PCBA.
the
Servo
PCBA.
and
the Logic PCBA.
In
addition to the
functional descriptions contained in this section, detailed descriptions of these PCBAs
are
contained
in
Section
V.
4-4
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