Tandy 1000 SL Technical Reference Manual page 445

Innennost t r a c k 1F asyymetry, FD-SSBR/FR: 0.7psec, Max.
FD-55GR: 0.35psec, Max.
Asymmetry
1F
i n t e r v a l
I
-
T r i g g e r
(Fig.3414) Measurement o f asymmetry
( 8 ) Execute i t e m s ( 5 ) through ( 7 ) f o r s i d e
0
and s i d e 1 heads r e s p e c t i v e l y .
(9) I f t h e v a l u e i n
i t e m (7) o r (8) i s o u t o f t h e s p e c i f i e d range, a d j u s t
according t o t h e following procedure.
Note: T h i s i t e m
i s
a p p l i e d only for a model w i t h a v a r i a b l e r e s i s t o r f o r
asymmetry adjustment.
( a ) Adjust t h e v a r i a b l e r e s i s t o r ,
R l
on t h e PCBA MFD c o n t r o l so t h a t t h e
asymmetry t a k e s a
small
value while r e p e a t i n g 1F w r i t e and 1F read
o p e r a t i o n s a l t e r n a t e l y .
(b) Repeat t h e o p e r a t i o n i n i t e m ( a ) f o r s i d e
0 and s i d e 1 heads a l t e r -
n a t e l y . The v a r i a b l e r e s i s t o r s h a l l be so a d j u s t e d that both
asymmetry
for
s i d e 0 and s i d e 1 heads t a k e t h e minimum value. Refer
t o Fig.220 i n i t e m 2-3-2.
(10) I f t h e v a l u e i n i t e m ( 7 ) or
( 8 )
i s o u t of t h e s p e c i f i e d range on a model
without v a r i a b l e r e s i s t o r , or
i f t h e adjustment i n i t e m ( 9 ) cannot be
done s u f f i c i e n t l y , following c a u s e s a r e assumed.
( a ) Leakage f l u x d e n s i t y i n t h e environmental c o n d i t i o n o f t h e F D D i s
high
:
-
3433
-