Stepper Motor Power (Ps, Ps*, Ds, Hl) - Tandy 6000 Service Manual

STEPPER MOTOR POWER
(PS, PS*, DS, HL)
W h e n th e P S ju m p e r is in s ta lle d , s te p p e r
m o to r p o w e r is c o n tr o lle d b y th e D r iv e S e le ct
lin e , D S, o r th e H e a d L o a d lin e , H L . W h e n
e ith e r lin e is t r u e (lo w ), th e s te p p e r m o to r is
d r iv e n w i t h f u l l p o w e r, a n d is re a d y f o r a Seek,
R ead, o r W r it e o p e ra tio n . W h e n e ith e r lin e is
fa ls e ( h ig h ), + 5 v o lt s ta n d -b y c u r r e n t is s u p ­
p lie d to th e s te p p e r m o to r to h o ld th e h e a d c a r ­
ria g e a s s e m b ly in p o s itio n . W h e n th e P S *
o p tio n is in , th e s te p p e r m o to r c o n tin u o u s ly
re c e iv e s f u l l p o w e r. P S * is d ia m e t r ic a lly oppo­
s ite P S (see F ig u r e 3 -3 ).
PS PS* DS HL STEPPER POWER
— X — — S te p p e r p o w e r
X — X — S te p p e r p o w e r o n w it h
X — — X
SPINDLE MOTOR CONTROL OPTIONS
(M1, M3, M4, MOL, MOH, MC1 -M C 4 )
M l is used to e n a b le th e m o to r o f f d e la y tim e r .
W h e n th is ju m p e r is in s ta lle d , a fiv e second
MOL MOH MCI
X —
— X
X —
X —
X —
X —
c o n tin u o u s ly on.
D r iv e S elect.
S te p p e r p o w e r on w it h
H e a d L o a d lin e J l- 1 8 .
MC2 MC3
— — —
— — —
X — —
— X —
— — X
— — —
t u r n o f f d e la y o f th e s p in d le m o to r is a c tiv a te d
on th e t r a i l i n g edge o f th e M o to r C o n tro l
s ig n a l.
W it h M o to r C o n tro l u s in g D r iv e
H e a d L o a d , th e M 3 a n d M 4 ju m p e rs d e te rm in e
w h ic h m e th o d o f M o to r C o n tro l is e n a b le d . I f
o p tio n M 3 o r M 4 ju m p e rs a re in s ta lle d , th e
M o to r O n C o n tro l, M C I — M C 4 , o p tio n s o p e ra te
in a lo g ic a l O R m a n n e r w it h
s ig n a l(s ) se le cte d b y th e M 3 a n d M 4 ju m p e rs .
I f th e M o to r D e la y T im e r o p tio n
( M l ) is
second t u r n o f f d e la y is in e ffe c t
re g a rd le s s o f w h ic h M 3 /M 4 c o n ­
f ig u r a t io n is im p le m e n te d .
Ml M3 M4
X —
— — —
— X —
— — X
— X X
MC4 MOTOR CONTROL
— M o to r C o n tro l s ig n a ls a re lo w
(tru e ) a c tiv e .
— M o to r C o n tro l s ig n a ls a re h ig h
(tru e ) a c tiv e .
— M o to r C o n tro l se le cte d v ia J l - 4 .
— M o to r C o n tro l se le cte d v ia J l - 6 .
— M o to r C o n tro l se le cte d v ia J l - 8 .
X M o to r C o n tro l s e le c te d v ia J l - 24.
3-10
S e le c t o r
th e c o n tro l
N O T E
in s t a lle d , th e f i v e
MOTOR CONTROL
— E n a b le s fiv e -s e c o n d
m o to r o f f d e la y tim e r .
M o to r C o n tro l o n ly
w it h M C I — M 4 o p tio n s .
M o to r C o n tro l u s in g
D r iv e S e le ct.
M o to r C o n tro l u s in g
H e a d L o a d .
M o to r C o n tro l u s in g
D r iv e S e le c t a n d H e a d
Lo a d , lo g ic a l A N D .