Read Sony CDX-GT31U Service Manual online
CDX-GT31U
CDX-GT31U
17
17
1 ANT
SCL
SDA
CDMON
CDON
CDON
ELECTRONIC VOLUME
IC401
J1
(ANTENNA)
TU1
(TUNER UNIT)
I2C BUS CONTROLLED POWER AMP/
MULTIPLE VOLTAGE REGULATOR
IC300
SYSTEM CONTROL
IC501 (1/2)
CN300
(REAR)
(FRONT)
BATT
6 CD-LCH
5 CD-RCH
5 CD-RCH
6
S-METER
7
TUN MUTE
93 VSM
5
QUALITY
9
RDS OUT
88 QUALITY
8
MUTE CON
75 TUATTIN
18 DAVN
BU+3.3V
87 RDS ON
20 CDM ON
51 CD ON
22 Z MUTE
51 CD ON
22 Z MUTE
11
VDD+5V
4
L-CH
3
R-CH
BU+3.3V
10
VCC+8.3V
86 TUATT
85 NSMASK
CD ON
CDM ON
CD L
CD R
4 TU-LCH
3 TU-RCH
3 TU-RCH
CD-RCH
A ATT
TU-RCH
AUDIO+8.3V
AUDIO+8.3V
19
SAOUT
18
SADA
5
3
3
OUT FL+
OUT FL–
9
7
7
OUT RL+
OUT RL–
29
27
27
AMP REM
R-CH
ANT REM
37
AUDIO+B
35
VP
20
VP1
6
VP2
BU+B
31
33
33
SERVO+3.3V
MECHA+6V
34
PANEL+B
28
MUTE
2 SDA
AUDIO+8.3V
BU+5V
SERVO+3.3V
MECHA+6V
PANEL+B
BU+5V
SERVO+3.3V
MECHA+6V
PANEL+B
4 SCL
SDA
SCL
SCL
16 BEEP
22 STB
25 DIAG
22 STB
25 DIAG
13
7
10
12
11
16
1
9
9
2
4
3
5
6
6
29
30
30
SCL
SDA
SCL
SA CLK
SA DATA
SA IN
SDA
SCL
SDA
59
56
56
VOLATT
ATT
29
I2C SCK
30
I2C SIO
BUIN
12 IN FL
FL+
FL–
FL–
RL+
RL–
RL–
FR+
FR–
RR+
RR–
FR–
RR+
RR–
AMP-REM
ANT-REM
ANT-REM
ACC
17
SACLK
MUTE
Q470
MUTE CONTROL
SWITCH
Q491,492
19
42
SYSRST
RESET
SYSRST
55
ACC IN
ACCESSORY CHECK
Q702
BATT
OVER VOLTAGE
CHECK
Q605
LOW VOLTAGE
CHECK
Q601
BATTERY
CHECK
Q602
MUTE
Q401
MUTE CONTROL
SWITCH
Q411,412
MUTE
Q440
MUTE
Q432
SA IN
SA DATA
83
SA IN
89
SADATA
SA CLK
90
SA CLK
D491
F901
R-CH
23
24
24
OUT–RL
OUT–RR
J652
R-CH
25
26
26
(SUB)
R-CH
22
OUT–FL
OUT–FR
(REAR/SUB)
AUDIO OUT
REAR/SUB
R-CH
L
R
21
SUBOUT–L
SUBOUT–R
D353
D602
BATT
D603
DISPLAY
SECTION
A
BATT
TUNER
VDD+5V
REG
Q3
NOISE MASK
SWITCH
Q1
RDS+3.3V
SWITCH
Q50,51
RDS DEMODULATOR
IC50
15
E2PVDD
13
SCL
16
E2PSCL
17
E2PSDA
14
SDA
BU+5V
BU+3.3V
REG
IC681
11 IN RL
TEL ATT
54
TELATT
TELEPHONE ATTENUATE CHECK
Q701
57
DIAG
58
AMPSTB
26
BEEP
AUX
J901
9 AUX-LCH
7 AUX-RCH
7 AUX-RCH
AUX-RCH
AUX-RCH
CD-RCH
TU-RCH
ZMUTE
44 WAKE UP
WAKE UP
36 MC RX
MC RX
35 MC TX
MC TX
23 VBUS ON
VBUS ON
Z MUTE
SYS RST
MECHA+6V
BU+3.3V
BU+3.3V
SERVO+3.3V
B/U CHECK
RXD
TXD
DR+6V
BU+3.3V
A+3.3V
CDON
CDMON
ZMUTE
WAKE UP
WAKE UP
SYSRST
BU IN
VBUS ON
VBUS ON
MC TX
MC RX
CD
MECHANISM
UNIT
(MG-101I)
(1/2)
11
SCL
15
INTN
16 MPX
XTO
XTI
12
SDA
SCL
SDA
SDA
1
VDDA
7
VDDD
10
9
X50
8.664MHz
BUIN
30
BATT
• Signal Path
• R-CH is omitted due to same as L-CH.
J
: CD PLAY
K
: FM
L
: AUX
f
: MW/LW
K
K
K
K
K
K
K
K
K
K
K
K
K
J
J
K
L
L
K
f
K
SECTION 5
DIAGRAMS
5-1. BLOCK DIAGRAM – MAIN Section –
(Page 18)
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