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CIRCUIT DESCRIPTION
1. Description of components
1-1. DAC UNIT (x25-2860-11)
Component
Use/Function
Operation/Condition/Compatibility
lcl ,lc2
PCM56P.K
D/A converter
C o n v e r t s d i g i t a l v a l u e i n t o a g a l o g q u a n t i t y .
tc3,rc4
NJM5532D.D
l-V converter
1 1 / 2 1 : C o n v e r t s D A C c u r r e n t i n p u t i n t o v o l t a g e .
(2121 : Generates offset voltage {or distortion correction.
t c 5 - r c 1 0
NJM5532D-D
O p a m p
F o r m s a G I C ( G e n e r a l l m p e d a n c e C o n v e r t e r l w i t h L P F .
t c
,1c12
p P A 6 S H A
D u a l F E T
F o r m s t h e 1 s t s t a g e o f o u t p u t a m p . i n t h e f i n a l s t a g e .
L I J
cx20197
O p a m p
A m p l i f i e r d e v i c e o f o u t p u t a m p ,
a 1 A
SM5804B
D i g i t a l f i l t e r
D i g i t a l f i l t e r w i t h 4 - f o l d o v e r s a m p l i n g .
L t 3
T C 7 4 H C O 4 F
H E X i n v e r t e r
I n v e r t s t h e l o g i c o f d i g i t a l f i l t e r o u t p u t a n d d e l a y s d a t a .
L t o
TA79LO06P
3 - t e r m i n a l r e o u l a t o r
( - ) p o w e r f o r D A C .
c ' t 7
TATSLOO6AP
3 - t e r m i n a l r e g u l a t o r
( + ) power for DAC.
t c
8 , t c 1 9
T C 7 4 H C 7 4 P
D u a l D f l i p - f l o p
U s e d i n d i s t o r t i o n c o r r e c t o r c i r c u i t
t c 2 0
TC74HC393P
D u a l 4 - b i t b i n a r y c o u n t e r
U s e d i n d i s t o r t i o n c o r r e c t o r c i r c u i t .
t c 2 1
TC74HCO4P
H E X i n v e r l e r
U s e d i n d i s t o r t i o n c o r r e c t o r c i r c u i t .
P H 1
T95-0035-05
P h o t o c o u p l e r
I n t e r f a c e b e t w e e n d i g i t a l f i l t e r a n d D A C ( U s e d f o r d a t a ) .
P H 2
T95-0036-05
P h o t o c o u p l e r
I n t e r f a c e b e t w e e n D A C a n d X 3 2 ( E m p h a s i s ) .
P H 3
T95-0036-05
P h o t o c o u p l e r
I n t e r f a c e b e t w e e n D A C a n d X 3 2 ( M u t i n g ) .
01 -o4
2 S C 9 4 5 ( A ) ( O , P )
Transistor
Used in cascode stage of 1 st stage o.f output amp.
05.06
2 5 K 1 7 0 ( V )
F E T
B e g u l a t e d p o w e r s u p p l y f o r c o n s t a n t - v o l t a g e c i r c u i t o f i s t s t a g e o f o u t p u t a m p .
07,Q8
2 S C 9 4 5 ( A ) ( O . P )
Tra nsistor
R e g u l a t e d p o w e r s u p p l y f o r d i f f e r e n t i a l a m p . o f 1 s t s t a q e o f o u t p u t a m p .
0 1 0
D T C l 1 4 Y F F
S w i t c h
De-emphasis relav driver
Q 1 1
D T C ] 1 4 Y F F
S w i t c h
M u t i n g r e l a y d r i v e r .
' r
012
D T C 1 1 4 Y F F
Switch
E m p h a s i s p h o t o c o u p l e r d r i v e r .
n 1 ?
D T C 1 1 4 Y F F
S w i t c h
M u t i n g p h o t o c o u p l e r d r i v e r .
0 1 4
2 S A 7 3 3 ( A ) , ( O , P )
S w i t c h
U s e d f o r s u p p l y i n g v o l t a g e t o t h e p h o t o c o u p l e r o u t p u t .
D 1 . D 2
R D 5 , i J S { B )
Z e n e r d i o d e
Supplies potential to the cascode stage of lst stage of output amp
D 3 , D 4
R D 5 . 1 J S ( B )
Z e n e r d i o d e
D e t e r m i n e s t h e p o t e n t i a l o f c o n s t a n t - c u r r e n t c i r c u i t o f d i f f e r e n t i a l
a m p o f 1 s t s t a q e o f o u t p u t a m p .
D 5 , D 6
R D l O E S ( B )
Z e n e r d i o d e
F e f e r e n c e p o w e r s u p p l y f o r c o n s t a n t - v o l t a g e c i r c u i t o f 1 s t s t a g e o f
o u t p u t a m p .
D8
t S s t / u
S w i t c h
Protects I C 1 6 a ga i nst cou nte r-withstan-d i ng vol taqe.
D 1 0 , D 1 1
t s S t / t )
S w i t c h
U s e d f o r c o u n t e r m e a s u r e a g a i n s t s t a t i c e l e c t r i c i t y .
D 1 2 . D 1 3 i S S 1 3 3 o r 1 S S 1 7 6
S w i t c h
U s e d f o r s h o r t - c i r c u i t i n g c o u n t e r - e l e c t r o m o t i v e v o l t a q e o f r e l a v .
u t 4
R D l O E S ( B }
Z e n e r d i o d e
D e t e r m i n e s t h e o p e r a t i n g v o l t a g e o f t r a n s i s t o r S W 0 1 4
L i t c
1 SS1 76
S w i t c h
P r o t e c t s l C 1 7 a g a i n s t c o u n t e r - w i t h s t a n d i n g v o l t a g e .
Table 1-1
l-,
a(
t:
t
ji
1 - 2 . C O N T B O L U N | T ( X 2 9 - 1 7 8 0 - 0 0 )
Component
Use/Function
Operatiory'Cond ition/Compatibil ity
t c l
cx201 09
O p t i c a l p i c k u p p r e a m p .
F o c u s i n g e r r o r s i g n a l g e n e r a t i o n , t r a c k i n g e r r o r s i g n a l g e n e r a t i o n , R F
signal generation and phase compensation, auto-symmetry correction
ci rcu i t.
t c 2 0 / 2 1
M 5 2 1 8 P
T r a c k i n g e r r o r p o l a r i t y d e t e c t o r
When tracking error is ( + ) : + 4V output.
When (-) : -4V output.
tc2l2l2l
M 5 2 1 8 P
F l a w d e t e c t o r l e v e l c o m p a r a t o r
Normally : -4V output. When flaw is detected : + 5V output.
I L J
pPD4053BC
T r a c k i n g e r r o r s i g n a l
select switch
The error signal supplied to the tracking servo circuit is selected accord-
i n g t o t h e l o g i c o f t h e M I R R s i g n a l s u p p l i e d v i a p i n 1 1 .
W h e n M I R R i s " L " : N o r m a l t r a c k i n g e r r o r s i g n a l .
W h e n M I R R i s " H " : C o n s t a n t v o l t a g e a t + 0 . 5 V o r - 0 . 5 V .
The polarity of the constant voltage supplied when the Ml R R signal
is
"H"
is selected according to the tracking error polarity detector
o u t p u t s u p p l i e d v i a p i n 1 O .
W h e n " H " : + 0 . 5 V . W h e n " L " : - 0 . 5 V .
T h e e r r o r s i g n a l s u p p l i e d t o t h e t r a c k i n g s e r v o c i r c u i t i s d e t e r m i n e d
according to the polarity of the flaw detector output supplied via pin 6.
W h e n " L " : E r r o r s i g n a l i s s u p p l i e d t o t h e t r a c k i n g s e r v o c i r c u i t .
W h e n " H " :
E r r o r s i g n a l i s n o t s u p p l i e d t o t h e t r a c k i n g s e r v o c i r c u i t .
Table 1-2
7
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