Sony HCD-GX20 Service Manual page 34

HCD-GX20
• IC Block Diagrams
IC731 LA9242M (CD BOARD)
64 62 61
63
APC
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
11
TA
12
TD-
- +
F. SERVO & F. LOGIC
TD 13
JP 14
+
-
TO 15
FD 16
17 18
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 Subcode
51
separation
SBSY 47 QCRC
SFSY 50
CS
63
WRQ 53
Microprocessor
interface
SQOUT 55
CQCK 57
COIN 56
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
RF DET 48 NC
47 TBC
46 FSC
45 DGND
∝-COM
LSC
INTERFACE
44 SLI
+ -
43 SLC
42 RFS-
+ -
41 RFSM
RF AMP
40 CV+
39 CV-
38 SLOF
37 HFL
36
TES
TOFF
35
34 TGL
33 JP+
SPINDLE SERVO SLED SERVO
+ -
+ - +
-
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
and correction Digital
attenuator
Flag processing
8x oversampling
digital filters
1-bit DAC
L.P.F
Crystal oscillator system
Timing generation
IC781 MN1469XH (CD BOARD)
IC101 LA1845 (MAIN BOARD)
24
ALC
BUFF
LEVEL
DET
FM
IF
1
30 C2F
IC301 BD3873FS (MAIN BOARD)
31 DOUT
24
0dB-
-87dB
-
Vcc/2
1
34 34
20 19 18
28 27 26 25 24 23 22 21
Vcc Vcc
-
+
+ +
- -
1 2 3 4 5 6 7 8 9 10 11
23 22 21 20 19 18 17 16
AM
AM AM
PF.AMP
OSC MIX
DEOODER
AGC ANTI-BIRDIE
P-DET
STEREO
AM AM
ø
IF DET
AM/FM
IF
COMP
S-CURVE BUFF
VCO
304kHz
TUNING
FM
DRIVE
DET
REG GND
V
CC
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
Vcc/2
50k 50k 50k 50k
2 3 4 5 6 7 8 9
17 16 15
12 13 14
15 14 13
PILOT
CANCEL
SW
FF FF π FF PILOT
38k 19k 19k 0
2 DET
10 11 12
15 14 13
Logic
Vcc/2
Vcc/2
50k 50k
10 11 12