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Supp~rt
Arm
Upward
Facing Arm
Figure 1-23. Head Assembly
[07483)
HEAD LOAD MECHANISM
Cable Support Spring
~
• Each read/write head is loaded
by
a head load spring
on the head load spring shaft.
• The four head load shafts are turned
by
a solenoid
acting through a cable and linkage.
• The heads unload automatically if the disk speed falls
below 64% of maximum, or if a data unsafe condition
exists.
• A knock-off mechanism is incorporated to ensure that
the heads are unloaded before leaving the disk.
5444 (<30100) FETMM
(5/70)
1-13
Read/Write
Pole Face
When the 5444 is not in use, the head/arm assemblies are
unloaded and retracted off the disks. The heads are not
loaded until the disk reaches full speed, the brush
cleaning cycle is completed, and the heads are detented
at track 000.
To load the heads, the head load solenoid (Figure
1-24) pulls on the head load cable to operate a linkage
on the head load spring shafts (Figure 1-25). The shafts
turn and the head load springs push the head sliders
towards the disk surface.
When the head load solenoid de-energizes, the head
load cable spring returns the head load shafts lifting the
Head Load Lever
Cable Guide
Cable Adjuster
Figure 1-24. Head Load linkage
( 07484)
head load springs, allowing the heads to move away from
the disk surface.
Head Load Solenoid Assembly
• Contains a pick winding and a hold winding.
Head Load Springs
(arrows indicate direction
of movement to load)
\ . - . . . - - - - - - Head Load Cable
Head Load
Cable Tensioner
Pivot
• The hold winding is shorted until the solenoid is
picked.
• Head load interlocks 1 and 2 are operated when the
solenoid is energized.
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