Pioneer SX-3900 Service Manual page 6

@ F M M U T I N G O F F S W I T C H
W h e n t h i s s w i t c h i s r e l e a s e d a n d a n F M b r o a d c a s t
t u n e d
i n , t h e m u t i n g c i r c u i t i s a c t i v a t e d i n s i d e
t o s u p p r e s s t h e
annoying interstation noise between
the broadcasting
f r e q u e n c i e s f o r n o i s e - f r e e r e c e p t i o n ' W h e n
t h e b r o a d c a s t -
i n g s t a t i o n i s f a r a w a y o r w h e n r e c e i v i n g
a s t a t i o n i n a
f r i n g e a r e a , s e t t n e s w i t c h t o t h e O F F
p o s i t i o n a n d t h e n
tune in. lf there is a broadcasting station
with a strong
signal level on the air next to a station
whose program
you want to receive, you may not be able
to tune in
s a t i s f a c t o r i l y b e c a u s e t h e s o u n d w i l l
b e d r o w n e d o u t
b y t h e s t r o n g e r s i g n a l s ' I n c a s e s l i k e t h i s '
s e t t h e F M
M U T I N G O F F s w i t c h t o O F F
( d e p r e s s e d p o s i t i o n ) a n d
t u n e i n . T h e m u t i n g c i r c u i t d o e s n o t
w o r k w h e n t h e
t u n e r i s r e c e i v i n g A M b r o a d c a s t s ' l f
t u n i n g h a s b e e n
p e r f o r m e d a f t e r t h e F M M U T I N G O F F s w i t c h
h a s b e e n
depressed and a station selected. the
quartz locked
c i r c u i t i s s e t t o t h e O F F m o d e a n d
t h e L O C K E D
i n d i c a t o r d o e s n o t l i g h t .
@ FM 25PS SWITCH
D e p r e s s t h i s s w i t c h w h e n l i s t e n i n g t o
a D o l b y * F M
broadcast; otherwise keep this switch
at the released
p o s i t i o n .
@ ) B R I G H T N E S S S E L E C T O R
Use this switch to select the brightness
of the power
m e t e r a n d t h e f r e q u e n c Y d i s P l a Y '
B R I G H T :
W h e n u s i n g t h e r e c e i v e r i n d a y l i g h t o r o t h e r
@ F U N C T I O N S E L E C T O R
Deoress the function switch which corresponds
to the
p r o g r a m s o u r c e . T u r n t h e v o l u m e c o n t r o l d o w n f i r s t
b e f o r e s e l e c t i n g a d i f f e r e n t f u n c t i o n s w i t c h
w h i l e t h e
s o u n d f r o m o n e p r o g r a m s o u r c e i s b e i n g r e p r o d u c e d '
F M :
A M :
Depress this switch for FM broadcasts'
Deoress this switch for AM broadcasts
A U X :
D e p r e s s t h i s s w i t c h w h e n l i s t e n i n g t o
a n
audio component connected to the
AUX
i a c k s .
P H O N O 2 : D e p r e s s t h i s s w i t c h w h e n
p l a y i n g a r e c o r d o n
t h e t u r n t a b l e c o n n e c t e d t o t h e P H O N O 2
j a c k s .
P H O N O 1 : D e p r e s s t h i s s w i t c h w h e n
p l a y i n g a r e c o r d o n
t h e t u r n t a b l e c o n n e c t e d t o t h e P H O N O
1
i a c k s .
NOTE:
OnlY one function switch should be depressed at
a ilme'
@ L O U D N E S S S W l r c H
W h e n l i s t e n i n g t o a p e r f o r m a n c e w i t h
t h e v o l u m e
control turned down, depress this switch
and the bass
a n d t r e b l e w i l l b e a c c e n t u a t e d '
W h e n t h e v o l u m e i s l o w , t h e h u m a n e a r
f i n d s i t h a r d e r t o
h e a r t h e b a s s a n d t r e b l e t h a n w h e n t h e
v o l u m e i s h i g h '
The loudness switch is thus designed to compensate
for
t h i s d e f i c i e n c y . B y d e p r e s s i n g t h i s s w i t c h '
t h e b a s s a n d
t r e b l e c o m e t h r o u g h m u c h m o r e s t r o n g l y
a n d t h e s o u n d
t a k e s o n a p u n c n e v e n w h e n t h e v o l u m e
c o n t r o l i s
t u r n e d d o w n .
b r i g h t l o c a t i o n s '
D I M :
A t n i g h t o r i n d a r k l o c a t i o n s w h e n t h e e x i s t -
i n g b r i g h t n e s s i s t o o h i g h '
* T h e w o r d , , D o l b y ' ' i s a t r a d e m a r k o f D o I b y L a b o r a t o r i e s I n c .