Download Print this page

Hitachi MP-1802 Technical Manual page 60

Hide thumbs

Advertisement

g e n e l ' a t e s
t h e
s t a n d a r d
t i m i n g
s i g n a l
( s " p a r a t e
c l o c k
s i g n a l ,
D - R C L K s i g n a l ) )
t o
s e p a r a t e
t h e
d a t a
b i t
a n d c l o c k
b i t
f r o m
t h e
R E A D D A T A s i g n a l
o f
d o u b l e
d e n s i t y
r e c o r d i r g
m o d e ( t t l , t t
r e c o r d i n g )
'
A l s o
t h e
s e p a r a t e
d a t a
s l g n a l
( D - R E A D D A T A s i g n a l )
i s g e n e r a t e d
b y r e s t o r i n g
t h e
w a v e f o r m .
T h e p h a s e d e t e c t i o n
c o n s i s t s
o f
1 C 1 1 3 ,
I C 1 1 5 , 1 C 1 1 7 ,
I C 1 1 2 ,
r c 1 1 / + a n d I c i 2 0 .
r c 1 z o , q 1 o z , c 1 2 7 a n d R 1 3 / , , m a k e
u p t h e
f i l t e r
a m p a n d l c 1 1 g m a k e s t h e v o l t a g e
c o n t r o l - g e n e r a t o r
( v o l t a g e
c o n t r o l
f r e q u e n c y
3 3 0 K H z
6 6 0 K H z ) .
T h e w a v e
r e s t o r a t i o n
e i r c u i t
c o n s i s t s
o f r c 1 0 9 , r c 1 1 6 , r c 1 1 2 a n d r c 1
1 0 .
l c l t . r
a l|(,tat!tal,
r c ! 0 5 a
i R € A O O A T A I
rcl(}9
rotat-|
t
r c t t 2
t{)t4lqt
F i g , 7 . 3 5
V F O D a t a S e p a r a t o r
511,.,.^, 5:1o,,-
t h e t i m e e h a r t w h e n t h e
w i t h
S Y N C d u r i n g
s e c t o r
r c t t o
r{o?aL! | 2!'
F i g .
7 . 3 6 s h o w s
d i s k
c o r r e s p o n d s
T h e p o w e r c i r c u i t r
p o w € r l a m p a n d D C
F i g .
7 , 3 7 .
T h e c i r c u i t
e x p l a n a t i o n
g i v e n i n t h e M P - 3 5 5 0 S e r v i c e
M a n u a l .
. . . / 5 6
r e a d d a t a f r o r n t h e
f o r m a t t i n g .
f a n
a r e
a l l
s h o w n i n
o f
t h e
p o w e r u n i t
i s
7 - 1 l r
P o w e r C i r c u i t .
)
r c t t .
6 \
- n
l \ , '
L
r e l s l
- l
L l g l
l t c t t e

Hide quick links:

Advertisement

loading

This manual is also suitable for:

Mp-3550