Tandy 1000 SL Technical Reference Manual page 478

( a u t o - r e c a l i b r a t i o n ) .
(12) I f t h e v a l u e i n i t e m (9) o r (11) i s o u t of t h e s p e c i f i e d range, a d j u s t
t h e p o s i t i o n o f t h e t r a c k
00
s e n s o r according t o t h e following
procedure.
( a ) Connect t h e 2nd channel of t h e o s c i l l o s c o p e t o
m , P T
o r TP8 (Differen-
t i a t i o n amp.) o f t h e PCBA MFD c o n t r o l and change t h e t r i y g e r t o t h i s
channel.
Oscilloscope range:
AC
mode, 0.2
%
O.SV, 20msec
( b ) I n s t a l l an alignment d i s k . The t r a c k alignment should be p r e v i o u s l y
a d j u s t e d according t o i t e m 3-4-12.
(c) Key i n
"CO"
and confirm t h a t t h e t r a c k i n d i c a t o r becomes
"00".
(RECALIBRATE).
( d ) Key
i n
t h e following number and confirm t h a t two l o b e p a t t e r n s a s i n
Fig.3418 can be observed.
4 8 t p i : C2 16
9 6 t p i : C2 32
I f normal l o b e p a t t e r n cannot
be
observed, move t h e head t o t h e
t r a c k p o s i t i o n where t h e t y p i c a l l o b e p a t t e r n can be observed by
s t e p p i n g i n by key "8" o r by s t e p p i n g o u t by key "9".
(e) Remove t h e alignment d i s k .
( f ) Key i n t h e f o l l o w i n g number.
(SET
T R A C K
NUMBER)
4 8 t p i : E4 16
% t p i : E4 32
(9) Key i n "C2 00".
(SEEK 00)
Don't key i n
' T O " .
(RECALIBRATE)
-
3466
-