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Preload Spring
The preload spring loads the leadscrew to ensure
head alignment with the diskette.
Limit Stops
The upper limit stop prevents the head from
being driven beyond track 77. The lower limit
stop prevents the head from being driven lower
than track 00.
Leadscrew Nut and Spring
The leadscrew nut and spring load the head and
carriage assembly to ensure head alignment with
the diskette.
1--
--j;;~::::::::J
Read!Write Head
The read/write head provides the read, write,
and erase functions.
Leadscrew Wheel
pper Motor Wheel
Stepper Motor Assembly
The stepper motor wheel is permanently
mounted on the end of the stepper motor shaft.
The stepper motor shaft turns in increments of
90 degrees in either direction under the control
of access pulses. The stepper motor wheel en-
gages the leadscrew wheel. When the stepper
motor wheel rotates 90 degrees, it rotates the
leadscrew wheel 90 degrees. The head carriage
assembly then moves up or down one track on
the diskette.
, - - - - - - - - - - - - File Control Card
The
Fe
card provides drive circuits for the stepper
motor, head load actuator, and write and erase
heads. It also provides the amplifiers for the
phototransistor and read head.
The file control card is oriented with the compo-
nents and the test pins face out. The card does
not have to be removed to service the machine.
--~~~~""'---'---:~~=-"7."''---1L.IL..-----
_ _ _
Drive Motor
The motor rotates the diskette at a speed of
360 rpm ± 2.5% with the head loaded.
33FD Diskette Drive
3-3
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