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Spindle Motor ana Spindle Assembly
The Spindle Assembly is driven by a belt attached between two pulleys.
The
drive
motor
pulley
is turned by a D. C. motor with a built in
integra~
tachometer.
The
spindle
pulley
connects
to
a hub that
rotates a clamped diskette.
Spindle Motor Enable Circuit
The
Motor On signal is derived from the host controller to the inter-
face
connector
via J8, Pin 16.
This signal is buffered and supplied
to
the servo circuit board, which uses it to enable the motor current
circuit of the spindle motor control via
JIO,
Pin 6.
5
4
TJIOIHT
TUTPOIHT
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AND SIDI SlLlCT
ANDUNDR
_
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CIRCUITS
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LOWmf
...
.
HDD
TOTJIOINT
6
f ..
~
.
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TlMIDOMAIN
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Dll'l'IRlHTlAlOR
,
.
DInClOR
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.
4
.
TUTJIOIHT
7
TEST POINT 9
r
4
DIGITlDR
. .
DATA OUTJlUT
•
•
,..
DRIVISlUCT
FIGURE 4-9
READ CIRCUIT BLOCK DIAGRAM
4-13
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