Pioneer SK-700 Service Manual page 4

2. MEC H A N IS M
. lnitialization
D ESC RI PTI ON
1. The mechanism uses six solenoids to perform the opera-
t i o n s r e q u i r e d i n S T O P , F F , R E W , P A U S E . P L A Y a n d
R E C m o d e s . F i g u r e 4 s h o w s t h e p o s i t i o n a l r e l a t i o n s h i p
between the solenoid and the gears (STOP mode in
t h i s c a s e ) .
2.When power is switched ON, the motor turns for a pre-
d e t e r m i n e d l e n g t h o f t i m e , r o t a t i n g t h e p u l l e y s a n d
g e a r ( A ) .
3. At the same time, the STOP solenoid comes ON and
p u l l s o n l e v e r ( A ) t o u n l o c k g e a r ( B ) . A r m ( A ) r o t a t e s
g e a r ( B ) a s h o r t d i s t a n c e ( i n t h e d i r e c t i o n o f t h e a r r o w ) ,
where it engages with gear (A).
4 . W h e n g e a r ( B ) s t a r t s t u r n i n g , t h e c a m p r e s s e s o n a r m ( B ) .
which in turn presses on the STOP lever.
5 . T h e S T O P l e v e r m o v e s t h e l o c k p l a t e i n t h e d i r e c t i o n o f
t h e a r r o w , r e l e a s i n g t h e l e v e r l o c k s f o r P L A Y , R E C , F F ,
a n d R E W .
6 . W h e r e P A U S E i s t h e m o d e e n t e r e d , r e l e a s i n g t h e P L A Y
lever causes the pin on the PLAY lever to move the slider
u n d e r n e a t h t h e l o c k p l a t e , a n d t h i s r e l e a s e s t h e P A U S E
l e v e r l o c k .
7 . A f t e r g e a r ( B ) r o t a t e s t h r u o n e f u l l t u r n , s i n c e t h e
s o l e n o i d i s n o w O F F , i t l o c k s .
F i g . 3
-
S t o p S o t e n o i d
L e v e r ( A )
G e o r ( B )
.-+
C o m
S t o p L e v e r
d
\
v
- A r m ( B )
G e o r ( A )
S t o p
F i s . 4
F A S P u t t e y
6
*12
A r m ( A )
N L
r\
Lr--J
tr
t i--1 1
E
A
D
r
tl
3
F i s . 5