Tandy 1000 SL Technical Reference Manual page 473

( 6 ) S e t t h e head t o t h e following t r a c k .
4 8 t p i (FD-55BR): Track 02
9 6 t p i (FD55FWGR): Track 04
(7) Confirm t h a t t h e v o l t a g e a t TP3 i s w i t h i n t h e following range a t t h e
t r a c k p o s i t i o n i n
i t e m
( 6 ) .
TP3 v o l t a g e a t t r a c k 02 ( 4 8 t p i ) or 04 ( 9 6 t p i ) : 0.5v, b x .
(8) I f t h e value i n i t e m ( 4 1 ,
(51, or (7) 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 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 o s c i l l o s c o p e t o TP7
o r TP8
( D i f f e r e n t i a t i o n amp.) o f t h e
PCBA M F D c o n t r o l .
Oscilloscope range:
AC
mode, 0.2
? ,
0.5V, 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 l Make t h e head move t o t h e p o s i t i o n where t h e l o b e p a t t e r n a s i n Fig.
3418 can be observed.
( d ) Remove t h e alignment d i s k .
(e)
Connect t h e o s c i l l o s c o p e or d i g i t a l v o l t m e t e r t o TP3 (Track 00 s e n s o r )
on t h e PCBA M F D c o n t r o l .
Oscilloscope range: DC mode,
1 V
( f ) S t e p o u t t h e head f o r t h e following space from t h e p o s i t i o n where
t h e normal l o b e p a t t e r n i s observed.
4 8 t p i : 15 t r a c k s ( t h e head w i l l be on t r a c k 01)
9 6 t p i : 30 t r a c k s ( t h e head w i l l be on t r a c k 0 2 )
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3461
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