Sony CDX-GT20 Service Manual ▷ View online
21
21
CDX-GT20
CDX-GT20
1
A
B
C
D
E
F
G
H
I
2
3
4
5
6
7
8
9
10
11
12
13
14
( )
R905
R904
FMB4
C983
C984
FMB3
R987
D981
C981
R931
R932
R947
R949
R945
R957
R959
R969
R971
R965
R967
D990
R995
R996
R912
R913
R914 R915
R916
D993
D991
D992
R938
R939
R940
R902
R903
R953
R955
R963
R910
R961
R911
R951
R934
R941
R901
R907
R908
R909
R935
R933
R943
LSW903
LED912
LSW902
LSW912
S904
LSW901
LSW920
S905
OFF
EQ
DSPL
LED911
LED911,S904
S914
S915
S916
S917
S918
S919
S921
S920
LED914
LED915
LED916
LED917
LED919
LED921
LED920
LSW903
SOURCE
LED914,S914
MODE
LED912,
S905
LCD
BACK
LIGHT
PTY
LED915,S915
1/ALBM–
LED916,S916
2/ALBM+
LED917,S917
3/REP
LED918,S918
4/SHUF
LED919,S919
5
LED920,S920
6/PAUSE
LED921,S921
AF/TA
Z
LED931
LSW913
.m
/
SEEK–
M>
/
SEEK+
LCD901
LIQUID CRYSTAL DISPLAY UNIT
LED918
1
37
1-872-639-
(11)
11
1-872-639-
(11)
11
1
3
2
4
5
RE901
RE901
(VOLUME)
PUSH SELECT
C985
C986
C987
R988
IC901
25
36
37
48
1
12
13
24
R999
R998
R997
R977
R975
R973
MAIN BOARD
CN701
A
D982
5-7. PRINTED WIRING BOARD — KEY SECTION —
: Uses unleaded solder.
(Page 17)
IC901
H-8
LED911
B-5
LED912
D-5
LED914
D-5
LED915
D-6
LED916
D-7
Ref. No.
Location
D981
H-11
D982
H-11
D990
G-11
D991
H-11
D992
G-11
D993
G-11
• Semiconductor Location
Ref. No.
Location
LED917
D-8
LED918
D-9
LED919
D-10
LED920
D-11
LED921
D-12
LED931
C-5
Ref. No.
Location
22
22
CDX-GT20
CDX-GT20
R911
R940
R939
R996
R997
R995
R909
R901
R998
R999
R912
R910
R904
R907
R938
R913
R914
R916
R908
R915
R903
R902
R935
R905
LED931
CN901
R931
R932
R933
R945
R934
R943
R941
R947
R949
R951
R953
R955
R959
R957
R961
R963
R965
R967
R969
R971
R973
R975
R977
C985
C986
S904
S905
LED911
LED912
LED915
LED914
LED916
LED918
LED917
LED919
LED920
LED921
LSW902(2/2)
LSW901(2/2)
LSW903(2/2)
LSW912(2/2)
LSW913(2/2)
RE901
C984
C983
C981
C987
R988
R987
D982
D981
LCD901
LSW920(2/2)
IC901
LSW912(1/2)
LSW913(1/2)
LSW920(1/2)
S914
S915
S916
S917
S918
S919
S920
S921
LSW901(1/2)
LSW902(1/2)
LSW903(1/2)
D990
D992
D993
D991
5-8. SCHEMATIC DIAGRAM — KEY SECTION —
(Page 20)
23
CDX-GT20
• IC BLOCK DIAGRAMS
IC401 BD3444FS-E2 (MAIN Board (1/3))
FIL
20
GND
19
SDA
18
SCL
17
MUTE
16
VCC
15
OUT-FR
14
OUT-FL
13
OUT-RR
12
OUT-RL
11
FADER
VCC
FADER:
0 – -62dB/1dB step
0 – -62dB/1dB step
TREBLE:
• fc = 10kHz
• GAIN = ±20dB/1dB step
• Q = 1
• fc = 10kHz
• GAIN = ±20dB/1dB step
• Q = 1
BASS:
• fc = 100Hz
• GAIN = ±20dB/1dB step
• Q = 1
• fc = 100Hz
• GAIN = ±20dB/1dB step
• Q = 1
VCO
I
2
C BUS
LOGIC
FADER
FADER
FADER
BUS-RCH
1
BUS-LCH
2
TU-RCH
3
TU-LCH
4
CD-RCH
5
CD-LCH
6
AUX-RCH
7
DN1
8
DN2
9
AUX-LCH
10
INPUT SELECTOR
INPUT GAIN
(0 – -20dB/1dB step)
PRIMARY VOLUME
(+12dB – -20dB/1dB step)
MUTE
BASS/TREBLE
VCC/2
VDDA
INTERPOLATOR
RAM
BUFFER
&
CONTROL
LOGIC
TEST LOGIC
&
PIN MUX'S
I
2
C/SPI
INTERFACE
BAND PASS
FILTER
SIGMA DELTA
CONVERTER
SINC4
FILTER
REF3
REF2
REF1
VSS
VDDD
RESETN
TM
1
MPX
16
CSN
SDAOUT
RDSREG
3
INTN
MPX
SINC4REG
SDAIN
SCK
SPI
TESTREG
SCK
SPI
TESTREG
14
2
3
4
5
6
7
8
INTN
15
SA
13
SDA
12
SCL
11
OSCILLATOR
XTO
10
XTI
9
RDS
DEMODULATOR &
SYNCHRONIZATION
2
IC51 TDA7333013TR (MAIN Board (1/3))
24
CDX-GT20
IC750 TDA8589BJ/N2/R1/M5 (AEP, UK) (MAIN Board (2/3))
IC750 TDA8589BJ/N2/R1 (RU) (MAIN Board (2/3))
IC750 TDA8589BJ/N2/R1 (RU) (MAIN Board (2/3))
MUTE
MUTE
ENABLE
LOGIC
STANDBY/
MUTE
BATTERY
DETECTION
CHIP DETECT/
DIAGNOSTIC
PROTECTION/
DIAGNOSTIC
SWITCH
REGULATOR
SWITCH
REFERENCE
VOLTAGE
LOADDUMP
PROTECTION
TEMPERATURE
PROTECTION
BACK-UP
SWITCH
REGULATOR
1
3
5
7
9
11
13
15
17
19
21
23
25
27
29
31
33
35
37
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
TAB
OUT-FL-
OUT-FL+
OUT-RL-
OUT-RL+
IN-RL
S-GND
IN-RR
OUT-RR+
OUT-RR-
OUT-FR+
OUT-FR-
DIAG
ANT-REM
AMP-REM
SERVO3.3V
MECH6V
VP
B.UP+B
SDA
SCL
VP2
PGND3
SVR
IN-FL
IN-FR
BEEP
PGND2
VP1
STB
PGND1
RST
CRES
AUDIO8.3V
GND
PANEL+B
CBU
FL
RL
RR
VP
FR
I
2
C BUS
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