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1-3. CD PLAYER UNIT (X32'1090'11)
CIRCUIT DESCRIPTION
012\ : PLL compensator circuit
l2l2l : CLY compensator circuit
Generates search pulses for focusing servo, tracking servo and feed m
servo.
Generates microprocessor reset pulse.
E F M d e c o d e r , c o r r e c t i o n / i n t e t p o l u t ! 9 n c i t c u i t , P L L c i t '
S i g n a l p r o c e s s o r R A M ( 1 6 K ) .
( L P F + a m P . 1 .
( L P F + l e v e l s h i f t e r ) .
11l2J : CLV compensator silsui{ (amp.)'
l2l2l : TraY driver circuit
D i g i t a l d a t a i n v e r t e r c i r c u i t .
C o n t r o l s d i g i t a l s i g n a l s u p p l y t o D A c '
C o n v e r t s d i g i t a l a u d i o d a t a i n t o S o n y / P h i l i p s d i g i t a l l / O
f o i m a t t o g '
t r a n s m i s s i o n s i g n a l
l C 9 d e m o d u l a t i o n
amp, pulse transformer driver'
C o n t r o l s d i s P l a Y , k e y - i n P u t
a n d s e r v o l C .
Interface circuit between microprocessor 9!ql!
if:919y
+ 5V resulated voltase for a449lel9-!!!-!i!91
- 5 V r e q u l a t e d v o l t a g e f o r d i g i t a l a n d P L L l i n e s '
+ 5V regula'ted voltage for servo line.
Error amp oI x12V constant
r e g u l a t e d c i r c u i t f o r D A C '
D i g i t a l d a t a i n v e r t e r c i r c u i t
F o r l o q i c i n v e r s i o n u s i
- d i s i t a l S W .
C u r r e n t b u f f e r f o r t r a c k i n g a c t u a t o r , f e e d m o t o r a n d t r a y
m o t o r o r
c i r c u i t r v .
Used to prevent operation of eye-pattern center sampling
circuit w
t h e d i s c m o t o r i s n o t d r i v e n '
inversion and level shifting of MON ortp,4-|1on' 9I?9991
l n v e r t s d i g i t a l d a t a a t h i g h s p e e d a n d a m p l i f i e s t h e c u r r e n t '
Discharges -5V DAC unit to 0V.
Supplies -5V to DAC unit
An emitter-follower used for supplying + 5V to DAC unit'
Controts SWs Q6 and 07
Controls potential at base of Q8'
Eliminates offset of motor driver circuit while me19!l1l99q9d'
Turns -5V for laser
O N / O F F
P o w e r s u p p l y i n t h e c o n s t a n t - v o l t a g e r e g u l a t e d l a s e r
p o w e r s u p p l y
Gomponenl
Use/Function
Operation/Condition/Compatibility
G o e s
" H " w h e n a s i g n a l i s o u t p u t f r o m t h e p i c k u p '
D e t e c t s t h e + s i d e e n v e l o p e o f R F s i g n a l . ( S m a l l t i m e c o n s t a n t )
Detects the + side envelope of RF signal.
(Large time constant)
When lC2l2l2l output becomes -4V, the switches function to
vent the negative potential to be applied to pin 6 of lC3'
When lC2ll/21 output becomes -4V, the switches function to
v e n t t h e n e g a t i v e p o t e n t i a l t o b e a p p l i e d t o p i n 1 0 o f l C 3 '
When the flaw detector level goes
"H" by detecting a flaw, the
t u r n s t h e M I B R s i g n a l a l s o
" H " .
atl
25C945(A)(o,P)
FOK current buffer
a2
2 S C 9 4 5 ( A ) ( o , P )
RF siqnal enveloPed detector
o3
2Sc945(A)(o,P)
R F s i q n a l e n v e l o p e d d e t e c l o r
Dl ,D2
1 S S 1 7 6 o r 1 S S 1 3 1
Switch
D3,D4
1 S S 1 7 6 o r
' l
S S 1 3 1
Switch
D 5
1 S S 1 7 6 o r 1 S S 1 3 1
Switch
Table 1-2
M 5 1 9 5 1 A S L
c x K 5 8 1 6 M
T C T 4 H C O O P
A N D g a t e ( s w i t c h )
TC74HC08P
D i g i t a l o u t p u t s i g n a l
m o d u l a t o r l C
c x D l 0 7 5 P
w i t h s t a n d i n g b u f f .
r c 1 2 - l C ' l 5
3 - t e r m i n a l
3 - t e r m i n a l r e g u l a t o r
TC74HC74P
C u r r e n t a m P l i f i e r t r a n s i s t o r
STA341 M
D i g i t a l t r a n s i s t o r s w i t c h
D i o i t a l t r a n s i s t o r s w i t c h
DTA1 24EN
2 S C 1 9 2 3 ( R , O )
2 S A 7 3 3 ( A ) ( O , P )
2SC945(A),(O,P)
2SA992(F,E )
2 S C 1 8 4 5 ( E , F )
25 K246(Y,G R )
2 S A 7 3 3 ( A ) ( O , P )
25K246(Y,G R )
Table 1-3
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