Sony HCD-GX40 / MHC-GX40 Service Manual ▷ View online
33
33
HCD-GX40
5-14. Schematic Diagram – POWER/TRANS Section –
-0.2
-0.2
37.7
0
0
36.5
37.1
0
0
0.6
37.7
0
-36
37.7
-36
11.6
0
0.6
11.6
0
0
-0.2
-0.2
-34.7
-37.7
0
0
No mark:FM
-25.6
-36
0.7
0.1
9
5.7
-26.1
-36
-35.3
0
0
11.6
0.6
POWER BOARD
22
50V
(1/2)
STK402-070S
(2/2)
STK402-070S
IC501
POWER AMP
(1/2)
IC501
POWER AMP
(2/2)
Q503,504
MUTE CONT
MUTE
D5SBA204101
TO
MAIN BOARD (4/4)
CN403
D
(Page 29)
TO
MAIN BOARD (3/4)
CN402
F
(Page 28)
(Page 34)
SENSOR
BOARD
FAN SW
C559
22
50V
150k
Q582,583
OVER HEAT DETECT
OVER
LOAD DETECT
OVER
LOAD DETECT
0.22/2W
0.22/2W
0.22/2W
0.22/2W
F
AN ON
2200
50V
50V
2200
50V
50V
TRANS BOARD
SUB TRANS BOARD
IC901
+5.6V REG
RELAY DRIVE
-30V GREG
POWER TRASFORMER
(SUB)
POWER TRASFORMER
(MAIN)
8A/125V
6.3A/125V
SUB WOOFER IN
TO
AMPLIFIER
BOARD
CN508
J
34
34
HCD-GX40
5-15. Printed Wiring Board – AMPLIFIER Section –
5-16. Schematic Diagram – AMPLIFIER Section –
IC503
AMPLIFIER BOARD
1
2
A
B
C
D
E
F
3
4
5
6
J
TO
POWER BOARD
CN506
(Page 32)
H
TO
MAIN BOARD
CN302
1-684-412-
(Page 25)
11
(11)
36.5
37.7
-0.2
-0.2
-36
0
0
37.7
37.7
37.1
-36
-36
-35.3
0
0.6
0
0
11.6
11.6
0
0
-34.7
-37.7
-0.2
-0.2
0
0
AMPLIFIER BOARD
IC503
POWER AMP
(1/2)
(1/2)
MUTE
MUTE CONT
MUTE CONT
IC503
POWER AMP
(2/2)
(2/2)
TO
POWER BOARD
CN506
J
(Page 33)
TO
MAIN BOARD (4/4)
CN302
H
(Page 29)
OVER LOAD
DETECT
OVER LOAD
DETECT
• See page 19 for Circuit Boards Location.
35
HCD-GX40
IC731 LA9242M (CD BOARD)
IC751 LC78622NE (CD BOARD)
• IC Block Diagrams
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
64
VCC1
LDS
LDD
BHI
PHI
LF2
VR
REFI
VCC2
FSS
DRF
CE
DAT
CL
CLK
DEF
FD-
FA
FA-
FE
FE-
SL-
SL+
AGND
NC
SP
SPG
SP-
SPD
SLEQ
SLD
JP-
NC
TBC
FSC
DGND
SLI
SLC
RFS-
RFSM
CV+
CV-
CV-
SLOF
HFL
TES
TOFF
TOFF
TGL
JP+
FIN2
FINI
E
F
TB
TE-
TE
TESI
SCI
TH
TA
TD-
TD
JP
TO
FD
62
61
60
59
55 54 53 52 51 50
49
48
47
46
45
44
43
41
40
39
38
37
37
36
35
34
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
42
58
57
56
RF DET
I / V
VCA
VCA
LSC
RF AMP
BAL
TE
T. SERVO & T. LOGIC
F. SERVO & F. LOGIC
SPINDLE SERVO
SLED SERVO
∝-COM
INTERFACE
APC
REF
+ -
+
-
+
-
+
-
+ -
+ -
+ -
- +
+ -
63
15
HFL
16
TES
17
T
OFF
20
JP-
19
JP+
58
RES
18
TGL
34
PCCL
24
RF GAIN
25
LP
26
D
.MUTE
27
LIMIT SW
28
SHUTER IN/OUT
29
EMPH/CONT6
48
EFLG
60
16M
61
4.2M
46
XVSS
52
FSX
45
XIN
44
XOUT
43
XVDD
39
R
VSS
41
R
VDD
42
MUTER/CONT8
40
RCHO
37
LCHO
35
MUTEL/CONT7
38
LVSS
36
LVDD
Servo
command
General-purpose
ports
Crystal oscillator system
Timing generation
L.P.F
1-bit DAC
54
RWC
56
COIN
57
CQCK
55
SQOUT
53
WRQ
63
CS
50
SFSY
47
SBSY
51
SBCK
49
PW
14
V/P
13
CLV-
12
CLV+
22
FSEQ
10
EFMIN
1
DEFI
Microprocessor
interface
Subcode
separation
QCRC
CLV digital
servo
Synchronization
detection
EFM demoduration
Slice level
control
8x oversampling
digital filters
Digital
attenuator
Digital
output
output
Bilingual
Interpolation
and muting
31 DOUT
30 C2F
C1 and C2 error detection
and correction
Flag processing
9
EFMO
VCO clock oscillator
Clock control
2k x 8-bit RAM
RAM address
generator
6
VVDD
4
VVSS
3
PDO
5
ISET
7
RF
21
PCK
2
TA
I
59
TST11
64
TEST1
11
TEST2
32
TEST3
33
TEST4
62
TEST5
23
VDD
8
VSS
36
HCD-GX40
IC101 LA1845 (MAIN BOARD)
IC781 MN1469XH (CD BOARD)
IC301 BD3873FS (MAIN BOARD)
LEVEL SHIFT
Vcc
1
2
3
4
5
6
7
9
8
20
19
18
17
16
15
14
11
10
21
22
23
24
25
27
26
SUBGND
CH4 OUT-B
CH4 OUT-A
CH4 IN-A
CH4 IN-B
BIAS-IN
Vcc
Vcc
CH3 IN-A
CH3 IN-B
CH3 OUT-B
CH3 OUT-A
OP IN -
OP IN +
OP OUT
MUTE
VREG-OUT
CH2 OUT-A
SUBGND
CH2 OUT-B
CH2 IN-A
CH2 IN-B
GND
CH1 OUT-A
CH1 OUT-B
CH1 IN-A
CH1 IN-B
-
+
TR-B
12
13
28
LEVEL SHIFT
-
+
-
+
-
+
-
+
-
+
-
+
Vcc
LEVEL SHIFT
LEVEL SHIFT
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
21
22
23
24
S-CURVE
AM/FM
IF
BUFF
COMP
TUNING
DRIVE
AM
OSC
OSC
AM
MIX
MIX
AM
PF.AMP
PF.AMP
AGC
AM
IF
AM
DET
DET
BUFF
LEVEL
DET
FM
IF
FM
DET
REG
GND
DEOODER
ANTI-BIRDIE
P-DET
ø
PILOT
CANCEL
STEREO
SW
VCO
304kHz
FF
38k
FF
19k
π
2
FF
19k
0
PILOT
DET
V
CC
ALC
AFC
AM-RF IN
AM-AGC
S.METER
AM DET-OUT
DECODER OUT
PLL-IN
DECODER IN
PILOT CANCEL
R-OUT
L-OUT
AM-OSC
OSC AM.SD
REG
AM IF-IN
GND
TUNED
STEREO
FM-DET
VCC
IF-REQ MUTE
AM/FM
VCO STOP
AM MIX-OUT
FM-IN
24
CAP
23
TNF1
22
TNF2
21
BNF2
20
BOUT2
19
BNF1
18
BOUT1
17
OUT1
16
OUT2
15
VCC
14
SI
13
SC
1
VIN1
2
VIN2
3
SEL2
4
SEL1
5
A1
6
A2
7
B1
8
B2
9
C1
10
C2
11
FIL
TER
12
GND
0dB-
-87dB
-
-87dB
-
Vcc/2
Vcc/2
Surround
50k
50k
50k
50k
50k
50k
Vcc/2
Vcc/2
Vcc/2
Treble1
fc=8kHz
Treble2
fc=8kHz
Bass2
fo=80Hz
Bass1
fo=80Hz
Logic
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