Diagrams; Block Diagram -Main Section - Sony CDX-GT420U Service Manual

5-1. BLOCK DIAGRAM – MAIN Section –
AUX-RCH
J901
L
AUX
J
CD L
CD R CD-RCH
MUTE CONTROL
A ATT SWITCH
Q411,412
CD ON
CDM ON
Z MUTE
CD
WAKE UP
MECHANISM
UNIT
SYS RST
(MG-101I)
B/U CHECK
(1/2)
VBUS ON
RXD
TXD
DR+6V
MECHA+6V
BU+3.3V
BU+3.3V
A+3.3V
SERVO+3.3V
TU1
(TUNER UNIT)
L-CH 4
R-CH 3
TU-RCH
J1 f K
1 ANT
(ANTENNA)
VCC+8.3V 10 AUDIO+8.3V
TUNER
VDD+5V
VDD+5V 11
REG
Q3
E2PVDD 15
BU+3.3V
SCL
SCL 13
E2PSCL 16
SDA
SDA 14
E2PSDA 17
S-METER 6
TUN MUTE 7
QUALITY 5
MUTE CON 8
RDS OUT 9
X50
8.664MHz
AEP,UK,RU MODEL
CDX-GT420U/GT424U/GT427UE/GT470U/GT470US
SECTION 5

DIAGRAMS

ELECTRONIC VOLUME
IC401
OUT–RL
23
OUT–RR 24 R-CH
L
9 AUX-LCH
(REAR)
AUX-RCH 7 AUX-RCH
OUT–FL 25
OUT–FR 26
R-CH
(FRONT)
SUBOUT–L 21
SUBOUT–R 22 R-CH
J
6 CD-LCH
(SUB)
CD-RCH 5 CD-RCH
MUTE
Q401
SACLK 17
CDON
SADA 18
CDMON
K
4 TU-LCH
ZMUTE SAOUT 19
TU-RCH
3 TU-RCH
WAKE UP
MUTE 28
SYSRST SCL
SCL 29
SDA
BU IN
SDA 30
VBUS ON
MC TX
MC RX
SYSTEM CONTROL
IC501 (1/2)
CDMON
20 CDM ON
CDON
51 CD ON
ZMUTE
22 Z MUTE
K
WAKE UP
44 WAKE UP
MC RX
AUDIO+8.3V 36 MC RX
MC TX
35 MC TX
BU+3.3V
REG BU+5V
VBUS ON
IC681 23 VBUS ON
93 VSM
86 TUATT
NOISE MASK
SWITCH 85 NSMASK
Q1
88 QUALITY
75 TUATTIN
RDS DEMODULATOR
IC50
SCL
SCL 11
SDA
SDA 12
16 MPX
INTN 15 18 DAVN
RDS+3.3V
10 XTO
1
VDDA SWITCH BU+3.3V
Q50,51
VDDD 7
9 XTI
87 RDS ON
K K
K K
K K
SA CLK
SA DATA
MUTE MUTE MUTE
SA IN
Q440 Q432
Q470
MUTE CONTROL D491
SWITCH BATT
Q491,492
SA CLK
SA CLK 90
SA IN
SA IN 83
SA DATA
SADATA 89
SCL
I2C SCK 29
SDA
I2C SIO 30
VOLATT
59
ATT 56
BEEP 26
AMPSTB 58
DIAG 57
ACC IN 55
TELATT 54
LOW VOLTAGE
BUIN 19 CHECK
Q601,602
SYSRST 42
D353
DISPLAY
RESET A
SECTION
(Page 24)
23 23
CDX-GT420U/GT424U/GT427UE/GT470U/GT470US
(FRONT)
J652
K
L
I2C BUS CONTROLLED POWER AMP/
MULTIPLE VOLTAGE REGULATOR R
R-CH
(SUB)
IC300
11 IN RL
CN300
1
K
12 IN FL OUT FL+ 5 FL+
9
K
OUT FL– 3 FL–
2
K
OUT RL+ 9 RL+
10
K
OUT RL– 7 RL–
4
FR+
12
FR–
3
R-CH
RR+
11
RR–
5
AMP REM
29
AMP-REM
6
ANT REM 27
ANT-REM
BATT
F901
16
VP 35 BATT
VP1 20
VP2 6
SDA
2 SDA
SCL
4 SCL
AUDIO+B 30 AUDIO+8.3V
BU+B 37
BU+5V
16 BEEP SERVO+3.3V
31 SERVO+3.3V
22 STB MECHA+6V 33 MECHA+6V
25 DIAG PANEL+B 34
PANEL+B
7
ACCESSORY CHECK
ACC
Q702
AEP,UK,RU MODEL
13
TELEPHONE ATTENATION CHECK
TEL ATT
Q701
D602
OVER VOLTAGE
CHECK BATT
Q605
D603
BATT
• R-CH is omitted due to same as L-CH.
• Signal Path
J
: CD PLAY
K
: FM
f
: AM/MW/LW/SW
L
: AUX
• Abbreviation
RU: Russian model
AUDIO OUT
REAR