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(D)
Check and a d j u s t m e n t p r o c e d u r e (SKA method)
(1)
Connect a n
SKA
and check c a b l e r e f e r r i n g t o i t e m 3-2-4 and
s e t
t h e FD
PWR s w i t c h t o t h e PSA s i d e .
( 2 )
Use two c h a n n e l s of
an
o s c i l l o s c o p e .
Connect t h e 1st c h a n n e l t o t h e
DOUT t e r m i n a l o f t h e
SKA
and t h e 2nd c h a n n e l t o t h e
D I F
t e r m i n a l of
t h e SKA.
O s c i l l o s c o p e range, The 1st channel:
DC
mode, 2V, 20msec
Apply p o s i t i v e t r i g g e r by DOUT t e r m i n a l .
The 2nd c h a n n e l :
AC
mode, 0.2
Q ,
0.5V, 20msec
( 3 )
Key i n "B9
F".
(INDEX
o b s e r v a t i o n )
( 4 ) T h i s i t e m i s a p p l i e d o n l y f o r 9 6 t p i F D D (FD-SSFR/GR) u s i n g a convent-
i o n a l
SKA.
Refer t o i t e m 3-2-4-7.
Key i n
"DD".
(H
GAIN
i n d i c a t o r t u r n s On).
(5) I n s t a l l
an
alignment d i s k .
(6) S t a r t t h e s p i n d l e motor by key "5".
(MON
i n d i c a t o r t u r n s o n ) .
( 7 ) Execute d r i v e select by key
"0".
( D S O
i n d i c a t o r t u r n s o n ) .
( 8 )
Key i n
'*CO"
and confirm that t h e T R A C K i n d i c a t o r becomes "00".
(RECALIBRATE)
( 9 )
S e t t h e head t o t h e a l i g n m e n t check t r a c k by t h e f o l l o w i n g o p e r a t i o n :
4 8 t p i (FD-55BR): Key i n "C2 16" and c o n f i r m t h a t t h e T R A C K i n d i c a t i o n
becomes "16".
% t p i
(FD-SsFR/GR):
Key i n "C2 32" and confirm t h a t t h e T R A C K
i n d i c a t i o n becomes "32".
(10)
Confirm that two
lobe
p a t t e r n s
a s
i n Fig.3418 c a n
be
o b s e r v e d
by
t h e
-
3456
-
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