Read Sony SDP-EP70 / SDP-EP90ES Service Manual online
– 19 –
– 20 –
SDP-EP70/EP90ES
– AC-3 (RF) SECTION –
AC-3
RF
INPUT
BUFFER
Q902
J901
3
L.P.F.
IC902
1
BUFFER
Q903
1
4
6
9
FILTER
FL902
BUFFER
Q904
+
2
7
COMPARATOR
IC903
COMPARATOR
5
6
7
RV901
NO ADJUSTMENT
AMP
IC904
IC904
3
1
DIN
DEMODULATION
S/P
ERROR
CORRECTOR
DAI
CONTROL
DIVIDER
DIGITAL
OUT
DAO
65
DAOUT
DIGITAL
PLL
4
X902
46.08MHz
L.P.F.
IC905
PHASE
COMPARATOR
DIVIDER
V1
4
1
X901
18.432MHz
INVERTER
IC906
55
57
78
X LOCK
MUTE SW
Q901
51 - 43
DB0 - DB8
21 - 24•26•27•30•31•37•38•42•39•33•34
A0
A14
ADDRESS
GENERATOR
27 22
S RAM
IC907
WE
OE
DB0 - 4
A0 - 14
27 22
WE
OE
11 - 13•15 - 19
I/O0
I/O7
11 - 13•15 - 19
I/O0
I/O7
10 - 3•25•24•21•23•2•26•1
A0
A14
10 - 3•25•24•21•23•2•26•1
A0
A14
S RAM
IC908
DB5 - 8
DB0 - 8
WE
OE
A0 - 14
A0 - 14
DATA - BUS DB0 - DB8
35 41
ADDRESS - BUS A0 - A14
INTERFACE
8
AC. RST
RESET
59
MUTO
MUTO
G
CONTROL
SECTION
C
D/A
SECTION
82
XIN
PDO
9
8
IC906
13
10
IC906
+
-
IC902
6
7
MUTI
09
DIGITAL SIGNAL PROCESSOR
(AC-3 RF DEMODULATOR)
IC901
• Signal path
:RF (AC-3)
:RF (AC-3)
(Page 17)
(Page 23)
CPU
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