Mechanical S E C T I O N - Tandy 1000 SL Technical Reference Manual

2-1-2.
Mechanical S e c t i o n
S i n c e a d i s k i s f l e x i b l e r e c o r d i n g media made o f m y l a r f i l m a n d d a t a
i n t e r c h a n g e a b i l i t y between d i s k a n d FDD i s r e q u i r e d , t h e m e c h a n i c a l
s e c t i o n o f t h e FDD u s e s p r e c i s i o n p a r t s a n d i t is a l s o a s s e m b l e d
c a r e f u l l y and p r e c i s e l y . F o r t h i s r e a s o n , o n l y t r a i n e d t e c h n i c i a n s
can h a n d l e t h e i n t e r n a l mechanism. Never a p p l y e x c e s s i v e i m p a c t n o r
d r o p t h e FDD down on t h e d e s k .
The m e c h a n i c a l s e c t i o n i s c o n s t r u c t e d w i t h f r a m e , d o o r mechanism, d i s k
clamp mechanism, d i s k r o t a t i o n mechanism, m a g n e t i c head a n d c a r r i a g e ,
head l o a d mechanism ( o r
CSs
mechanism), head s e e k mechanism, v a r i o u s
d e t e c t i o n mechanisms, e t c .
(1) Frame
The main s t r u c t u r e f o r mounting t h e v a r i o u s mechanisms a n d p r i n t e d
c i r c u i t b o a r d s . The frame i s made o f aluminum d i e c a s t t o m a i n t a i n
t h e s t a b i l i t y o f t h e FDD i n s t r e n g t h , p r e c i s i o n , d u r a b i l i t y , and
e x p a n s i o n c o e f f i c i e n t .
( 2 ) Door mechanism a n d d i s k clamp mechanism
The d o o r mechanism i s c o n s t r u c t e d w i t h main p a r t s o f
set arm
which f o r m s
t h e s t r u c t u r e f o r i n s t a l l i n g t h e d i s k on t h e s p i n d l e , o t h e r p a r t s o f
f r o n t l e v e r , clamp arm, e t c . The s e t arm i s a t t a c h e d t o t h e r e a r o f t h e
frame w i t h l e a f s p r i n g a n d a c o l l e t ,
which forms t h e d i s k clamp
mechanism, i s a t t a c h e d on t h e
t i p
of t h e set arm.
When a d i s k i s i n s e r t e d a n d t h e d o o r ( f r o n t l e v e r ) i s c l o s e d , t h e c o l l e t
i s i n s e r t e d i n t o t h e c e n t e r h o l e of t h e d i s k a n d t h e d i s k i s clamped i n
t h e correct p o s i t i o n a l o n g t h e o u t e r c i r c u m f e r e n c e o f t h e c o l l e t .
( 3 )
Disk r o t a t i o n mechanism
The d i s k r o t a t i o n mechanism
comprises DD m o t o r Ass'y ( s p i n d l e motor)
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