Kenwood DP-1100 B Service Manual page 124

D P - 1 1 0 0 B II
In a d d i t i o n , c o n c e r n i n g t h e set n u m b e r of t r a c k s , as t h e stage
N o . l o w e r s by 1 , t h e n u m b e r of t r a c k s b e c o m e s nearly half.
T h e r e f o r e , n o r m a l l y , t h e p i c k u p crosses t h e s e a r c h i n g p o s i ­
t i o n by a r o u n d 2 or 3 kick o p e r a t i o n s w i t h t h e s a m e stage.
H o w e v e r , the p i c k u p is m o v e d b a c k a lot if v i b r a t i o n or disc
f l a w exist. In this c a s e , m o r e t h a n 3 kick o p e r a t i o n s w i t h t h e
s a m e stage are n e e d e d t o cross t h e s e a r c h i n g p o s i t i o n . In
D P - 1 1 0 0 B / I I , w h e n m o r e t h a n 10 kick o p e r a t i o n s w i t h t h e
s a m e stage are p e r f o r m e d , a m e a s u r e t o raise the stage N o .
by 1 (the n u m b e r of t r a c k s is nearly d o u b l e d ) is t a k e n t o
s h o r t e n t h e s e a r c h t i m e .
[ 5 ] Process a d v a n c e s t o step [ 6 ] or [ 7 ] a c c o r d i n g to w h e t h e r
or n o t b a c k w a r d 1-track kick o p e r a t i o n is m a d e .
28
3. OPERATION OF MAIN MICROPROCESSOR
Fig. 3 - 1 H Operation f l o w chart of kick s e a r c h s y s t e m
[ 6 ] T h e stage N o . is l o w e r e d by 1 to reverse the kick d i r e c ­
t i o n . H o w e v e r , as s h o w n in Table 3 - 1 D , if t h e last p i c k u p
m o v e m e n t w a s t h e f o r w a r d
1-track kick o p e r a t i o n is f u r t h e r m a d e until t h e p i c k u p
crosses t h e s e a r c h i n g p o s i t i o n .
[ 7 ] A s it is b a c k w a r d 1-track kick o p e r a t i o n , the
p o s i t i o n is 1 track ( 0 . 1 2 to 0 . 3 3 sec) a h e a d f r o m t h e
t a r g e t p o s i t i o n . T h u s , it w a i t s in play m o d e
ON Code 3) until t h e p i c k u p goes a c r o s s t h e sear­
c h i n g a d d r e s s . W h e n t h e p i c k u p crosses t h e a d d r e s s , t h e
d e s i g n a t e d p l a y / p a u s e m o d e is e n g a g e d , t h e n a series of
search o p e r a t i o n is c o m p l e t e .
1-track kick, b a c k w a r d
present
( m u t i n g