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3.1.1 33FD Description
Cover ____________________________________________________
~
The 33FD cover permits insertion and removal
of the diskette.
3-2
:JJ.LL...".LL-+---~--
Light Emitting Diode (LED) and
Phototransistor
Collet Assembly
-----------------i----Ti7'...;;....,.,;WT--f~.6.
When the cover is closed, the continuous light
emitted from the LED is directed toward the
phototransistor. Once every revolution, the
index hole in the diskette allows light from the
LED to reach the phototransistor. The photo-
transistor sends index pulses to the processing
unit via the 33FD attachment.
When the cover is closed, the spring-loaded
collet centers and clamps the diskette to the
drive hub.
Head Load Actuator Assembly
--------------!---~!------..,~
The head load actuator assembly consists of a
magnet and an armature. During a read or write
operation, the magnet is energized and allows
the pressure pad arm to push the diskette
against the read/write head. At the same time,
the diskette is cleaned when the armature forces
the diskette envelope against the diskette. While
not reading or writing, the head load actuator
is deenergized and holds the pressure pad assem-
bly away from the diskette to reduce wear to
the diskette surface and/or the read/write head.
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