Sony HCD-GSX75 / MHC-GSX75 Service Manual ▷ View online
41
41
HCD-GSX75
7-16. Schematic Diagram – KEY Section –
CN709
D758
R716
R717
R751
R752
R753
R754
R760
R761
R762
R763
R764
R766
R767
R769
R770
R771
R772
R773
R774
R775
R784
CNP706
R719
R718
CNP713
R765
R785
R768
R787
CP702
CP701
CN715
D751
D752
D753
D755
D757
D759
D760
D761
R750
R782
R788
R789
R790
R793
R795
R796
CN706
R755
R756
Q759
S779
S778
RV751
RV752
S751
S753
S754
S760
S770
S761
S762
S773
S774
S775
S764
S763
S765
S766
S776
S777
S767
S768
S769
S755
S756
Q770
JR772
S752
S772
6P
SLR-342VR
100k
100k
220
330
470
680
220
330
470
680
1k
2.2k
4.7k
220
330
470
680
1k
1.5k
2.2k
1k
100k
100k
6P
1.5k
4.7k
10k
33k
13P
SLR-342VRT
SLR-342VRT
SLR-342VRT
SLR-342VRT
SLR-342VRT
SLR-342VRT
SLR-342VRT
SLR-342VRT
470
470
470
470
470
470
470
470
1k
1.5k
KRC102S
KRC102S
0
JOG-A
JOG-B
VOL-B
VOL-A
VOL-A
VOL-B
JOG-B
JOG-A
DSP-KEY
DSP-KEY
KEY0
KEY1
KEY2
LED3
LED4
LED5
LED6
LED7
LED8
LED9
LED10
LED10
LED9
LED8
LED7
LED6
LED5
LED3
LED4
KEY0
KEY2
KEY1
STBY LED
STBY LED
P-KEY
P-KEY
I/
I/
D751-753,755,757,759-761
(ILLUMINATION)
HCD-GSX75
42
42
7-17. Printed Wiring Board – POWER Section – • See page 22 for Circuit Boards Location.
C903
FH903
FH904
JW902
JW903
JW901
D904
CNP901
D902
R903
R901
D901
D905
C904
D903
F902
R905
T902
R902
C902
Q901
E
C901
CNP902
RY901
R904
LF901
TER902
N
TER901
L
D906
CP901
CP902
11
(11)
1-687-602-
*
* NOT REPLACEABLE:
BUILT IN TRANSFORMER
BUILT IN TRANSFORMER
T901
POWER TRANSFORMER
G
MAIN
BOARD
(Page 32)
R
AMP
BOARD
(Page 36)
POWER BOARD
AC IN
2
3
4
5
6
7
A
1
B
C
D
E
43
43
HCD-GSX75
7-18. Schematic Diagram – POWER Section –
CNP901
C904
D906
D905
R902
C902
R903
D902
D901
D904
C903
CNP902
RY901
LF901
D903
R901
R904
C901
FH903
FH904
R905
Q901
F902
T902
0.01
250V
1N4002B
1N4002B
100 1/4W
100
50V
33 1/4W
1N4002B
1N4002B
1N4002B
0.1
50V
RELAY
1N4002B
1 1/4W
3.3M
470
16V
0.1
1/4W
DTC-114YSA
RELAY
DRIVE
6.3A
125V
125V
SUB
TRANS
BUILT IN TRANSFORMER
NOT REPLACEABLE:
*
T901
POWER
TRANSFORMER
AC IN
HCD-GSX75
44
44
• Waveforms
– CD Board –
– CD Board –
– MAIN Board –
– DISPLAY Board –
0.96Vp-p
1
IC101 t; (RFAC)
(CD Play Mode)
2
IC101 el (FE)
(CD Play Mode)
200mV/DIV, 1 µs/DIV
100mV/DIV, 200 µs/DIV
100mV/DIV, 200 µs/DIV
0.5V/DIV, 20ns/DIV
250mVp-p
470mVp-p
3
IC101 ra (TE)
(CD Play Mode)
4
IC104 yd (XI)
1.2Vp-p
16.9MHz
0.5V/DIV, 40ns/DIV
5
IC801 qd (XOUT)
16MHz
1.7Vp-p
1V/DIV, 100ns/DIV
6
IC701 id (X1)
3.8Vp-p
4MHz
7-19. IC Block Diagrams
RW/ROM
RW/ROM
EQ ON/OFF
VOFST
VOFST
DVC
VC
VC
VC
RW/ROM
VC
DVC
30
29
28
+
–
+
–
DVC
VCC
DVC
27
26
25
24
RW/ROM
EQ
23
22
21
20
19
RFAC
VCA
VCC
+
–
DVC
+
–
+
–
RW/ROM
VC
RW/ROM
DVC
+
–
3
A
B
C
D
B
C
C
A
A
A
B
C
C
D
B
C D
D
+
–
1
2
APC AMP
5
6
7
8
9
4
RFAC
SUMMING
AMP
RW/ROM
APC-OFF
(Hi-Z)
RW/ROM
(H/L)
VOFST
VC
RW/ROM
+
–
10
11
GM
GM
18
17
16
B
D
A
C
13
14
15
12
EQ IN
LD
PD
GND
A
B
C
D
AC SUM
E
F
DVCC
DVC
RFAC
SW
DC OFST
RFDCI
RFDCO
VC
RFC
VFC
BST
RFG
VCC
CEI
CE
TE BAL
TE
FEI
FE
– CD Board –
IC103 CXA2581N-T4
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