Sony HCD-GX20 Service Manual page 34

HCD-GX20
Q Q
3 7 6 3 1 5 1 5 0
• IC Block Diagrams
IC731 LA9242M (CD BOARD)
64 62 61
63
APC
RF DET
FIN2 1 VCA
FINI 2
I / V
E 3
F 4
BAL VCA
TB 5
TE- 6
+
TE
-
TE
7
TESI
8
T. SERVO & T. LOGIC
SCI 9
TH 10
TA 11
TD- 12
- +
F. SERVO & F. LOGIC
TD 13
JP 14
+
-
TO 15
FD 16
17 18
T E
L 1 3 9 4 2 2 9 6 5 1 3
IC751 LC78622NE (CD BOARD)
9 6 4 3 5 7
DEFI
1
Slice level VCO clock oscillator
control Clock control
EFMIN
10
Synchronization
FSEQ
22 detection
EFM demoduration
CLV+ 12
CLV digital
servo
CLV-
13
V/P
14
PW 49
SBCK 51 Subcode
separation
SBSY 47 QCRC
SFSY 50
CS 63
WRQ 53
Microprocessor
interface
SQOUT 55
CQCK 57
COIN
56
w w w Servo General-purpose
command ports
RWC
54
15 16 17 20 19 58 18 34 24 25 26 27 28 29 48 60 61 46 52 45 44 43 39 41 42 40 37 35 38 36
60 59 58 57 56 55 54 53 52 51 50 49
REF
48
NC
47 TBC
46 FSC
45 DGND
∝-COM
LSC
INTERFACE
SLI
44
+ -
43 SLC
42
RFS-
+ -
41 RFSM
RF AMP
40
CV+
39 CV-
38 SLOF
37 HFL
36
TES
35 TOFF
34 TGL
SPINDLE SERVO SLED SERVO 33 JP+
+ -
+ - +
-
19 20 21 22 23 24 25 26 27 28 29 30 31 32
21 2 59 64 11 32 33 62 23 8
2k x 8-bit RAM RAM address
generator
Interpolation
and muting
Bilingual
Digital
output
C1 and C2 error detection
Digital
and correction
attenuator
Flag processing
8x oversampling
digital filters
1-bit DAC
L.P.F
Crystal oscillator system
Timing generation
x a o
. i
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IC781 MN1469XH (CD BOARD)
IC101 LA1845 (MAIN BOARD)
Q Q
3 7 BUFF 6
LEVEL
DET
30 C2F
IC301 BD3873FS (MAIN BOARD)
31 DOUT
24
0dB-
-87dB
u 1 6 3
-
y
Vcc/2
1
34 34
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2 4
8 9 9
20 19 18
28 27 26 25 24 23 22 21
Vcc Vcc
-
+
+ +
- -
1 2 3 4 5 6 7 8 9 10 11
24 23 22 21 20 19 18 17 16
ALC AM
AM AM
PF.AMP
OSC MIX
DEOODER
3 1 5 1 5 0 8 9
AGC ANTI-BIRDIE
P-DET
STEREO
AM AM
ø
IF DET
AM/FM
IF
COMP
S-CURVE BUFF
VCO
304kHz
TUNING
FM
FM DRIVE
IF
DET
REG GND
V
CC
1 2 3 4 5 6 7 8 9
23 22 21 20 19 18 17 16
Treble1 Treble2 Bass2 Bass1
fc=8kHz fc=8kHz fo=80Hz fo=80Hz
Vcc/2
m
c o
Vcc/2
.
50k 50k 50k 50k
2 3 4 5 6 7 8 9
2
8 9 9
17 16 15
12 13 14
15 14 13
PILOT
2 4 9 8 2 9 9
CANCEL
SW
FF FF π FF PILOT
38k 19k 19k 0 DET
2
10 11 12
15 14 13
Logic
Vcc/2
Vcc/2
50k 50k
10 11 12