Section I - Principles Of Operation; Model Q2080 Block Diagram; Model Q2080 Drive Mechanism - Quantum Q2080 Product Description

SECTION I
PRINCIPLES OF OPERATION
1.1 MODEL Q2080 BLOCK DIAGRAM
The block diagram shown in Figure 1-1 represents the Model Q2080 disk drive. The spindle drive motor may be
powered by either
no
VAC, 220 VAC or 24 VDC. The motor drives the spindle by a belt and pulley arrangement. There is
a different belt/pulley set for 50 HZ and 60 HZ AC. The DC motor uses the 60 HZ belt/pulley set. These interchangeable
belt/puley sets allow the spindle to rotate the disks at 3,000 RPM for either frequency.
The head stack assembly is mounted to the rotor of the proprietary rotor positioner assembly. The positioner motor
is driven from circuitry on the control PCB via power drivers on the heat sink. Track crossing and coarse position feed-
back signals are obtained from an optical encoder and scale assembly via the encoder PCB. A dedicated servo surface pro-
vides fine track position. This servo data is written on the bottom surface of the lowest platter. Read/write signals are ob-
tained from or written to seven disk surfaces via the heads, head switching matrix, and preamplifier encoder. The drive
control PCB contains electronics for reading and writing, as well as the microprocessor that controls actuator positioning
and servo position decoding.
~OWER_
DC
I
AC INPUT (NOT USED ON DC MOTOR OPTION)
DC INPUT (NOT USED ON AC MOTOR OPTION)
ENCODER PCB
ACTUATOR
DRIVER
HEAT
SINK
OPTICAL
TRACK CROSSING
DETECTOR
FIGURE 1-1
MODEL Q2080 BLOCK DIAGRAM
1.2 MODEL Q2080 DRIVE MECHANISM
DRIVE BELT
\1
INDEX
TRANSDUCER
The drive mechanism consists of the mechanical drive sub-assemblies in a sealed enclosure. None of
these sub-assemblies requires adjustment nor are they field repairable.
1-1
REV A (01/84)