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Upper Disk Enclosure
Bottom Cove<
I
Upper Disk
Hub Assembly
Figure 1-10. 5440 Disk Cartridge
[07470]
Disk
Armature Ring
Figure 1-11. Upper Disk Hub Assembly
[07471]
• The cartridge carrying handle is used to release the
cartridge from the drive spindle, and to release the
cartridge bottom cover.
The removable upper disk on its hub assembly is
enclosed between the upper disk enclosure and the
protective cover of the cartridge.
When the cartridge is installed in the 5444, the upper
and lower disk hub assemblies are locked together on the
drive spindle (see Figure 1-12). The upper disk hub
5444 (<30100) r:ETMM
(5/70)
1-7
Handle
Magnets (4)
Protective Cover
Clamp Ring
Hub Assembly
assembly seats on a cone at the top of the drive spindle.
To allow the read/write heads and the cleaning brushes
to enter the upper disk enclosure, a head entry port and
a brush entry port are formed in the side wall of the
upper disk enclosure. Four slots in the side wall of the
upper disk enclosure enable accurate location of these
ports.
When removed from the machine, the upper disk
enclosure is placed in a bottom cover (see Figure 1-10).
Cartridge
Lower Disk
Hub Assembly
Cone
Figure 1-12. Cartridge on Drive Spindle
[07472)
Four ring magnets, set into the bottom cover (see Figure
1-13), clamp the hub assembly to the bottom cover.
The
cartridge
is moulded from
polycarbonate.
Customer cartridges have a blue top cover with a dull
white bottom cover; CE cartridges have a black top
cover and dull white bottom cover. The disk cartridges
may be used in any 5444. One version of the disk
cartridge is common to all models of the 5444.
Cartridge Clamp Arms
When the cartridge is in use, the bottom cover fits on
top of the disk enclosure. Both are then held in position
by two cartridge clamp arms (see Figure 1-1 ). The clamp
arms actuate two cartridge interlocks that form part of
the machine interlock circuits. These interlocks inhibit
machine start-up if the cartridge or bottom cover are
positioned incorrectly.
The clamp arms, when swung away to permit cartridge
removal, operate a drawer stop at each side of the
Upper Disk
Fixed Disk Shield
Base
machine. These stops prevent the machine being closed
into the drawer while the clamp arms are in the 'release'
position.
Cartridge Handle
The cartridge carrying handle is also used for removing
the cartridge from the 5444 drive spindle, or for
releasing the disk from the cartridge bottom cover when
removed from the machine.
To release the disk, the handle is lifted and at the same
time the cartridge release catch (Figure 1-13) must be
held against its spring; rotation of the handle then forces
open the magnetic seal between the upper and lower hub
assemblies.
To refit the disk, it must be positioned correctly on
the drive spindle or in the cartridge bottom cover, and
the handle allowed to drop.
For normal carrying purposes, the handle is lifted from
its horizontal rest position.
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