Tandy 1000 SL Technical Reference Manual page 466

i) C a l i b r a t i o n value + (.Relative humidity
-
50) x k
0 :
When t h e l e f t s i d e l o b e p a t t e r n l e v e l ,
VA
i s assumed a s "l",
l o b e p a t t e r n r a t i o should be so a d j u s t e d t h a t t h e r i g h t s i d e
lobe
p a t t e r n l e v e l VB t a k e s t h e f o l l o w i n g value:
VB =
-
C a l i b r a t i o n value
+
( R e l a t i v e humidity
-
50) x K
100
ii) C a l i b r a t i o n value
+
( R e l a t i v e humidity
-
5-j
x
9
>_
0 :
When t h e r i g h t s i d e l o b e p a t t e r n l e v e l ,
VB i s
aaanned a s "l",
l o b e p a t t e r n r a t i o should be so a d j u s t e d t h a t t h e l e f t s i d e
l o b e p a t t e r n l e v e l VB t a k e s t h e following value.
=
-
C a l i b r a t i o n value
+
( R e l a t i v e humidity
-
50) K
100
e . g . 9 6 t p i , C a l i b r a t i o n value = -6%, R e l a t i v e humidity = 35%:
-6
+
(35
-
50)
x
0.42 = -12.3 < 0
-
-6
+
(35
-
50) x 0 . 4 2 = o.88
100
Therefore, t h e t a r g e t value o f VB when VB i s assumed a s
"1"
i s
0.88.
( d ) Repeat t h e a d j u s t i n g o p e r a t i o n i n i t e m ( c ) a l t e r n a t e l y f o r s i d e
0
and s i d e 1 heads u n t i l t h e b o t h misalignment
take
t h e s m a l l e s t v a l u e .
( e ) Tighten t h e two f i x i n g screws o f t h e s t e p p i n g motor
l i t t l e by
l i t t l e f o r a d j u s t i n g t h e t r u e value o f misalignment a f t e r t i g h t e n i n g
t h e
screws
w i t h t h e s p e c i f i e d t o r q u e t o be w i t h i n f20%.
( f ) Remove t h e alignment d i s k .
(9) Apply a drop o f l o c k i n g p a i n t to t h e head o f t h e s t e p p i n g motor
f i x i n g screws.
-
3454
-