Sony CDX-GT28M Service Manual ▷ View online
CDX-GT28M
CDX-GT28M
21
21
1
A
B
C
D
E
F
G
H
2
3
4
5
6
7
8
9
10
11
12
13
14
A
MAIN BOARD CN701
.
N
;
LED931
(LCD BACK LIGHT)
LIQUID CRYSTAL DISPLAY PANEL
IC971
OFF
EQ3
SEEK+
SEEK–
LSW903
DSPL/SCRL
LED951,982,1951,1952,
(RING ILLUMINATION)
3/REP
4/SHUF
LSW909
LSW908
LSW907
LSW905
LSW906
BTM
2/ALBUM+
1/ALBUM–
LSW904
LED941,S901
LSW914
MODE
5
6/PAUSE
LSW911
LSW910
1-877-026-
(11)
11
1-877-026-
(11)
11
PUSH SELECT
(VOLUME)
RE901
RE901
LSW901
AUX
J901
LSW902
LSW913
LCD901
LSW912
SOURCE
LED944
(CD INDICATER)
LSW903
IC971
4
3
1
2
LED931
LSW902
LSW906
S901
LSW901
LSW904
LED1952
LED951
LED1951
LED941
R975
C97
1
LSW912
R944
R905
R904
R907
R908
LSW908
R971
LED982
R902
LSW909
LSW910
R942
LSW911
LSW905
LSW907
R91
5
R95
4
R953
R1971
LED944
LSW913
R947
R941
LSW914
C990
R946
C921
C922
R922
R921
R982
R974
D981
R981
FB903
D993
R933
R931
R932
R909
D992
R913
R949
R914
R952
R950
D991
D994
R910
CN901
R901
R992
D903
R948
R943
R903
R972
R1972
R945
D985
D986
C999
R979
R978
R97
7
C986
D982
R984
R98
7
Q932
Q931
R934
IC901
D998
C983
C981
R912
R911
R951
R988
R986
C984
C987
R985
J901
37
1
4-7. PRINTED WIRING BOARD – KEY SECTION –
: Uses unleaded solder.
(Page 17)
Ref. No. Location
• Semiconductor Location
Ref. No. Location
D903
G-11
D981
F-10
D982
G-9
D985
G-12
D986
G-12
D991
G-11
D992
G-11
D993
G-11
D994
G-11
IC901
G-8
IC971
C-13
LED931 C-13
LED941 C-2
LED941 C-2
LED944 B-7
LED951 B-4
LED982 D-4
LED1951 C-5
LED1952 C-4
Q931
G-13
Q932
H-13
CDX-GT28M
CDX-GT28M
22
22
R901
R902
R903
R904
R907
R908
R909
R911
R910
R912
R913
R914
R915
R981
R982
D98
2
CN901
R932
R933
R931
R975
D903
D98
1
D994
D991
D992
D993
D98
6
D98
5
R987
R977
R979
R978
R988
R992
C999
C922
C921
R922
R921
LSW
912(1/2)
S901
LSW903(1/2)
LSW902(1/2)
LSW901(1/2)
LSW
913(1/2)
LSW
914(1/2)
LSW
904(1/2)
LSW
905(1/2)
LSW906(1/2)
LSW907(1/2)
LSW908(1/2)
LSW
909(1/2)
LSW910(1/2)
LSW
911(1/2)
C971
C981
C986
C987
R984
R985
R986
R985
R986
C983
C984
C984
R905
LSW910(2/2)
LSW909(2/2)
LSW908(2/2)
LSW905(2/2)
LSW911(2/2)
LSW907(2/2)
LSW906(2/2)
LSW904(2/2)
LSW914(2/2)
LSW913(2/2)
LSW912(2/2)
LSW901(2/2)
LSW902(2/2)
LSW903(2/2)
C990
RE901
LCD901
J901
Q932
LED931
R934
Q931
D998
IC901
FB903
R974
IC971
LED944
R941
R942
R944
LED941
R943
R945
R946
R948
R950
R947
R949
R953
R954
R951
R952
R1972
R972
LED1952
R1971
LED982
LED1951
LED951
R971
4-8. SCHEMATIC DIAGRAM – KEY SECTION –
(Page 19)
CDX-GT28M
23
• IC Block Diagrams
IC750 TDA8588AJ/N2/R1 (MAIN Board (1/3))
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
BU+B
SDA
SCL
VP2
PGND1
SVR
IN–FL
IN–FR
BEEP
PGND3
VP1
STB
PGND4
RST
CRES
AUDIO+B
GND
PANEL+B
CBU
FL
RL
RR
VP
FR
I
2
C BUS
CDX-GT28M
24
IC1 TEF6607T/V3/S470, 518 (MAIN Board (2/3))
AMRFIN 1
AMRFDEC 2
FMIN2 3
FMIN1 4
LOUT 8
ROUT 9
MPXOUT 13
RSSI 14
XTAL2 15
XTAL1 16
GNDAUD 10
GNDRF 5
VCC+8.5V 6
AMRFAGC 7
AMIFAGC 11
MPXIN 12
AMOUT2
32
AMOUT1
31
AMIFAGC1
30
AMSELIN2
29
VCOLOOP
25
VCCVCO
24
VREF+4V
20
SDA
19
SCL
18
GNDDIG
17
GNDANA
23
AMSELIN1
28
TESTCT
27
VCOREF
26
VCC+8.5V
22
GREGSUP
21
AM
TUNER
FM
TUNER
OUTPUT
PLL
TUNING
SYSTEM
I2C BUS
POWER
SUPPLY
STEREO DECODER
HIGH CUT
SOFT MUTE
NOISE BLANKER
SIGNAL
IMPROVEMENT
CONTROL
BANDWIDTH
CONTROL
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