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3 . 2 D E C K C O N T R O L S I G N A L S E C T I O N
o Basic Operations
T h e c a s s e t t e d e c k m e c h a n i s m u s e s s w i t c h e s ( S 1 - 1 , S 1 - 2 ,
52) to detect mode switching operations. Pressing the keys
t o s w i t c h m o d e s t u r n t h e s w i t c h e s O N / O F F . T h e l i s t b e l o w
shows the switch-mode status.
5 1 - 1 ( S T O P l e v e r s w i t c h ) . . . . .
S T O P
5 1 - 2 ( R E C P A U S E s w i t c h ) . . . . P A U S E
5 2
( S L I D E R S W I T C H ) . . . . .
. P L A Y , R E C , F F , R E W
PLAY mode operations will be used as an example to
describe the role the switches play. The relationship bet-
ween the solenoid and switches at PLAY key entry is shown
i s F i g . 1 7 .
A . . . . P L A Y k e y e n t r y t u r n s t h e s o l e n o i d O N , a n d
s t a r t s t h e m e c h a n i s m m o d e s w i t c h i n g o p e r a t i o n .
B . . . . N e x t . 5 2 i s t u r n e d O N , a n d i t f u n c t i o n s t o
detect the proper switching operation (PLAY
m o d e i n t h i s c a s e ) . a n d t h i s t u r n s t h e s o l e n o i d
O F F .
.
Tape End Detector
Circuit
The cassette mechanism's tape end detector switch (FAS
s w t i c h ) a l s o c o m e s O N a t t i m e s o t h e r t h a t a t t h e e n d o f t h e
tape, so PD1004 is designed to recognize the end of the
t a p e a s t h e s e c o n d t i m e t h i s s w i t c h i s t u r n e d O N .
T h e
s e c o n d t i m e m e a n s t h e s e c o n d t i m e w i t h i n t h e s a m e o p e r a -
tional mode; if the mode is changed somewhere before the
e n d o f t h e t a p e , t h e s w i t c h w i l l h a v e t o c o m e O N t w i c e i n
that mode before the end of the tape is recognized. lf the
s w i t c h i s t u r n e d O N d u r i n g a m o d e s w i t c h i n g o p e r a t i o n ,
i t w i l l b e i g n o r e d .
o Muting Output
D E C K M O O E
P L A Y S O L E N O I D
T 3
( P D t O O 4 P r N 2 4 )
M U T E O U T P U T
( P D l O 0 4 P r N 2 0 )
O P E N
M u t i n g i s o u t p u t f r o m p i n 2 O o f l C P D 1 0 0 4 , a n d d u r i n g
t h e t a p e P L A Y m o d e , i s o n l y l i f t e d ( d r o p p i n g l o w ) a t t h e
. POWER ON STOP
W h e n t h e p o w e r i s t u r n e d O N , t h e d e c k m e c h a n i s m w i l l
g o t h r o u g h o n e S T O P o p e r a t i o n ( a f t e r i n i t i a l r e s e t ) a n d b e
p l a c e d i n a S T O P s t a t u s n o m a t t e r w h a t t h e p r e v i o u s m o d e
O N
O F F
s 2 ( s L r D E R s w r t c r . i t o F F
O N
F i g . 1 7
C . . . . A f t e r m o d e s w i t c h i n g o p e r a t i o n s a r e c o m p l e t e d ,
s w i t c h 5 2 t u r n s O F F .
D u r i n g t h e A - C i n t e r v a l , o t h e r k e y e n t r i e s a r e i n h i b i t e d .
( H o w e v e r , S T O P i s e f f e c t i v e a n y t i m e , a n d s w i t c h i n g f r o m
R E C t o R E C P A U S E i s o n l y i n h i b i t e d b e t w e e n A a n d B . )
From a STOP status, a key entry turns the motor on at
A , a n d p r e s s i n g S T O P w i l l t u r n t h e m o t o r o f f a t C .
D E C K M O D E
O F F
F A S S W I T C H
o N
+
E N D
F i s . 1 8
3)ru
li
F i s . l 9
A l l o t h e r c i r c u m s t a n c e s h o l d t h e
P L A Y K E Y I N P U T
P L A Y S O L E N O I D
O P E N
p o i n t s h o w n i n F i g . i 9
o u t p u t c i r c u i t o p e n .
s e t t i n g w a s . T h e s i g n a l s f o r t h i s o p e r a t i o n a r e p r o c e s s e d b y
l C P D 1 0 0 4 , w i t h o u t p u t b e i n g t h e s a m e a s f o r n o r m a l
STOP key entry.
P L A Y M O D E
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