Tandy 1000 SL Technical Reference Manual page 439

3-4-8. Check of Head m u c h
(Al
Equipment
(1) Work d i s k
( 2 ) SKA
or
u s e r ' s system
(3) Oscilloscope ( n o t r e q u i r e d when an
SKA
i s
used)
( 4 ) Dc c l i p on ammeter
( n o t r e q u i r e d when an
SKA i s
used)
(B-1) Check procedure (General method)
(1) Connect an o s c i l l o s c o p e t o TP7 or TP8 ( D i f f e r e n t i a t i o n amp.) on t h e
P C B A M F D c o n t r o l .
Oscilloscope range:
AC
mode, 0.1
'L
0.2V, 2Omsec
(2) I n s t a l l
a work d i s k and s t a r t t h e s p i n d l e motor.
(31
S e t t h e head t o t h e innennost t r a c k .
(4) Execute t h e head loading.
(5) Repeat t h e c y c l e o f one w r i t e r o t a t i o n and one read r o t a t i o n .
Write d a t a should be t h e f i x e d p a t t e r n
of
2F (250KHz o f
W R I T E DATA
frequency f o r FD-SSBWFR and 5001Mz f o r FD-SSGR).
(6) Write down t h e average read l e v e l measured d u r i n g t h e r e a d o p e r a t i o n
o f
i t e m (5).
(71 Execute items (5) and (6) w i t h a s l i g h t d e p r e s s i o n (very s l i g h t
depression easy
t o release:
10
%
209) by a f i n g e r on t h e t o p o f t h e
upper head, and measure t h e average read l e v e l
as
i n
i t e m
(6).
( 8 )
Confirm t h a t t h e read l e v e l measured i n
i t e m
( 6 )
i s
g r e a t e r t h a n 80%
of that in item (7).
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