MEX-BT2800, MEX-BT2807E, MEX-BT2850 - Sony Car Audio Service Manual (repair manual). Page 27

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MEX-BT2800/BT2807E/BT2850
MEX-BT2800/BT2807E/BT2850
27
27
4-6.  SCHEMATIC  DIAGRAM - KEY Board -
• See page 28 for IC Block Diagrams.
CN701
(3/3)
BOARD
MAIN
A
IC B/D
0.1
0.1
5.2
5.1
5.2
5.1
2.6
2.6
2.6
2.6
2.6
2.6
2.6
5.2
3.5
1.7
2.6
4.7
0.3
3.1
3
5.1
5.2
5.1
2.6
2.6
2.6
2.6
2.6
2.6
2.6
2.6
2.6
2.6
2.6
2.6
2.6
2.6
2.6
2.6
2.6
2.6
2.6
2.6
2.6
2.6
2.6
2.6
2.6
2.6
2.6
2.6
2.6
2.6
2.6
2.6
2.6
2.6
2.6
2.6
2.6
2.6
2.6
2.6
2.6
2.6
2.6
2.6
5.1
0
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
17
18
19
20
21
22
29
28
27
26
25
24
23
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
LC75829PWH-US-H
IC901
LIQUID CRYSTAL DISPLAY DRIVER
BACK-LIGHT
DIMMER
NCO
BLINK
SEG48
SEG47
SEG46
SEG45
SEG44
SEG43
SEG42
SEG41
SEG40
SEG39
SEG38
SEG37
SEG36
SEG35
SEG34
SEG33
SEG32
SEG31
SEG30
SEG29
SEG28
SEG27
SEG26
SEG25
SEG24
SEG23
SEG22
SEG21
SEG20
SEG19
SEG18
SEG17
SEG16
SEG15
SEG14
SEG13
SEG12
SEG1
1
SEG10
SEG9
SEG8
SEG7
SEG6
SEG5
SEG4
SEG3
COM4
COM3
COM2
COM1
S2
VDD
VDD1
VDD2
VSS
S52/OSC
INH
CE
CLK
DATA
LCD901
LIQUID CRYSTAL DISPLAY
1
5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48
52
2
4
49
51
3
50
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
15P
CN901
D-GND
KEY-GND
AUX-LCH
AUX-RCH
AUX-GND
RE-0
RE-1
KEY-1
KEY-0
SIRCS
DATA-LCD
CE-LCD
CLK-LCD
+B
PANEL
100
R977
100
R978
100
R979
0.1
C984
0.1
C983
0.1
C981
0.47
C986
1M
R987
MA2J1
110GLS0
D982
MAZ8051GMLS0
D983
0.1
C971
150
R981
150
R982
100
R975
100
R974
1.2k
R904
820
R901
1k
R902
1k
R903
0
R922
0
R921
820
R905
1k
R906
1k
R907
1.2k
R908
1.5k
R910
2.2k
R912
3.3k
R919
3.9k
R988
MAZ8068GMLS0
D986
MAZ8068GMLS0
D985
MAZ8068GMLS0
D991
MAZ8068GMLS0
D992
MAZ8068GMLS0
D993
MAZ8068GMLS0
D994
MAZ8180GMLS0
D903
RT1N436C-TP-1
Q932
LCD BACK LIGHT SWITCH
1.2k
R931
NESW505CT-AST
LED931
220
R935
220
R934
220
R933
CL-197HB1E-D-T
LED944
470
R941
CL-197HB1E-D-T
LED952
CL-197HB1E-D-T
LED951
CL-197HB1E-D-T
LED949
CL-197HB1E-D-T
LED950
CL-197HB1E-D-T
LED947
CL-197HB1E-D-T
LED948
CL-197HB1E-D-T
LED945
CL-197HB1E-D-T
LED946
R980
470
R989
270
R991
470
R990
270
R992
270
R993
470
R996
390
R995
470
R972
1k
C919
0.1
R963
470
R965
470
R983
0
R973
820
R966
1k
R964
470
R962
470
CL-197HB1E-D-T
LED961
CL-197HB1E-D-T
LED960
1.8k
R911
CL-197HB1E-D-T
LED940
CL-197HB1E-D-T
LED955
CL-197HB1E-D-T
LED956
R961
470
R960
470
R959
0
R997
390
R937
0
390
R942
R976
820
VCC
OUT
GND
IC902
PNA4813M01S0
RT1N140C-TP-1
Q931
DIMMER SWITCH
J901
FB902
0
FB901
0
FB903
0
S901
S902
S903
S907
S906
S905
S904
S909
ROTARY
ENCODER
LSW908
3
1
2
4
5
6
3
1
2
4
5
6
3
1
2
4
5
6
3
1
2
4
5
6
3
1
2
4
5
6
3
1
2
4
5
6
3
1
2
4
5
6
COM1
COM2
COM3
COM4
S48
S46
S47
S45
S44
S43
S42
S41
S40
S39
S38
S37
S36
S35
S34
S33
S32
S31
S30
S29
S28
S27
S26
S25
S24
S23
S22
S21
S20
S19
S18
S17
S16
S15
S14
S13
S12
S1
1
S10
S9
S8
S7
S6
S5
S4
S3
S2
S20
S19
S18
S17
S16
S15
S14
S13
S12
S1
1
S10
S9
S8
S7
S6
S4
S3
COM4
COM3
COM2
COM1
S2
S1
S5
CE
CLK
DATA
S48
S47
S46
S45
S44
S43
S42
S41
S40
S39
S38
DATA
CLK
CE
S37
S1
S21
S22
S23
S24
S25
S26
S27
S28
S29
S30
S31
S32
S33
S34
S35
S36
AUX
LCD
BACK
LIGHT
DISC
SLOT
ILLUMINATION
SOURCE
OFF
SCRL
DSPL
BT
MODE
LED949, 950, 955, 956, 960, 961
(ILLUMINATION)
SOURCE
OFF
BT
SCRL
DSPL
PUSH/SELECT/
(VOLUME)
SEEK +
SEEK -
MODE
PAUSE
6
LSW902
(BT2800: US, CND)
(BT2800: AEP, UK/BT2807E)
(BT2850)
PTY
PTY
AF/TA
CAT
PTY
LSW906
SHUF
4
LSW904
ALBUM +
2
LSW903
ALBUM -
1
LSW907
MIC
5
LSW905
REP
3
REMOTE CONTROL
RECEIVER
KEY BOARD
IC902
IC901
10
3
D
1
6
8
11
7
12
5
G
E
4
2
F
9
B
A
13
H
C
5
2
1
4
3
SEEK +
SEEK -
MAZ8051GMLS0
D955
DTC114TKA
Q933
LED DRIVE
1 3 2
(Page 25)

Note: Refer to the servicing notes “NOTE FOR REPLACEMENT 
OF THE AUX JACK (J901)” (See page 5), if replacing the 
Ref. No. J901.
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