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o s c i l l o s c o p e ( i t i s n o t n e c e s s a r y t h a t t h e l e v e l s o f
VA
and VB
are
equal)
.
I f o n l y one l o b e p a t t e r n can
be
o b s e r v e d o r i f two l o b e s become one
p a t t e r n , t h e head i s n o t on t h e a l i g n m e n t check t r a c k .
I n such e v e n t , e x e c u t e s t e p - i n o r s t e p - o u t o f t h e f o l l o w i n g t r a c k s '
space t o o b t a i n t h e most s i m i l a r waveform t o t h a t i n Fig.3418.
S t e p
o p e r a t i o n c a n be done by key "8)' (STEP-IN) and key
"9"
(STEP-OUT).
By
a d e p r e s s i o n of t h e s e keys, head
w i l l move f o r one t r a c k s p a c e .
4 8 t p i :
2
t r a c k s
9 6 t p i : 4 t r a c k s
Note: The above number o f t r a c k s t o be s t e p p e d i n r e q u i r e d t o make t h e
alignment t r a c k p o s i t i o n be f i t w i t h t h e magnetized c o n d i t i o n of
t h e b a s i c phase
"A"
o f t h e s t e p p i n g motor.
For a 4 8 t p i FDD, t h e l o b e p a t t e r n s h a l l be observed a t t h e even
t r a c k , w h i l e i t s h a l l be o b s e r v e d a t t h e t r a c k o f m u l t i p l e number
o f f o u r f o r a 9 6 t p i
FDD.
(11) Key i n "E3".
(ALIGNMENT)
C a l i b r a t i o n v a l u e o f t h e alignment d i s k and environmental r e l a t i v e
humidity should be s e t p r e v i o u s l y i n t h e
SKA.
(12) The D A T A i n d i c a t o r , XXXX
( % )
i n d i c a t e s t h e misalignment v a l u e .
,'-(+I
mark means t h a t t h e head i s s h i f t e d inward from t h e r e f e r e n c e p o s i t i o n ,
w h i l e
-
mark means t h a t t h e head i s s h i f t e d outward.
( a ) When SKA3 i s used:
By keying i n "E3", s i d e
0
and s i d e 1 v a l u e s
are
i n d i c a t e d on D A T A 0
and D A T A 1 i n d i c a t o r s s u c c e s s i v e l y .
The i n i t i a l d i g i t i n d i c a t e s /(I1
o r
2
(OUT).
"OUT"
means t h e v a l u e a f t e r s t e p - o u t o p e r a t i o n .
" I N "
means t h e v a l u e a f t e r s t e p - i n o p e r a t i o n , w h i l e
-
3457
-
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