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Hitachi MP-1802 Technical Manual page 39

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' ) t r
0 u t p u t
S i g n a l s
1 .
R E A D Y
W h e n t h e i n s e r t e d
d i s k
r o t a t i o n
s p e e d b e c o m e s m o r e t h a n
6 0 i [ o f t h e r a t e d
3 0 0 r p m a n d i f
t h e i n d e x p u l s e
j - s d e t e c t e d
m o r e t h a n
t w o
t i m e s ,
R E A D Y = r f l r r .
z. Tffi-o'O
W h e n t h e r e a d , / w r i t e
h e a d . i s
a t T r a c k 0 0 p o s i t i o n ,
T R A C K 0 0 = r r L f r o
3. TNIffi
W h e n t h e i n s e r t e d
d i s k
s t a r t s
r o t a t i o n
a n d d e t e c t s
t h e
i n d e x h o l e ,
T T n f f i = t f
- 1 - 1 - r r ( l o w p u l s e ) .
L .
R E A D D A T A
T o c o r r e s p o n d w i t h
t h e m a g n e t i c f l u x
i n v e r s i o n
o n t h e
-
d i s k ,
E E T D - f f i T
= t ' - l - f
r t ( l o w p u l s e ) .
5 .
W R I T E P R O T E C T
W h e n a w r i t e
p r o t e c t e d
d i s k
i s
i n s e r t e d ,
f f i
=
' l T l l
L J .
*
C i r c u i t
0 p e r a t i - o n
1 .
S t e p M o t o r C o n t r o l
T h e / + - p h a s e D C m o t o r r o t a t e s
1 5 d e g r e s s e a c h m
= t r 1 - r f
.
T h e r o t a t i - n g
d i r e c t i o n
i s
d e c i d e d b y m .
T h e 3 m
s i g n a l
i s
i g n o r e d
w h e n f f i ' f f i I
= r r l t r a n d
W R I T E G A T E = f r l r r .
o
. . . / 3 7

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