Read Sony MEX-BT2500 Service Manual online
MEX-BT2500
33
33
MEX-BT2500
5-6. SCHEMATIC DIAGRAM – KEY Board –
•
See page 34 for Waveforms.
•
See page 34 for IC Block Diagrams.
R974
R904
CN901
FB901
FB902
FB903
D988
D987
D989
D990
D991
D903
D992
D993
D994
C988
R934
Q931
Q932
R932
R933
D998
R931
S904
R907
R908
R909
R910
R911
R912
R913
R914
R915
R916
S901
S902
R901
S903
R902
R903
R905
R922
R921
R992
R941
R942
R943
R944
R945
R946
R947
R948
R962
R961
R975
C971
D981
D982
C985
R987
C986
C981
R988
C987
C983
C984
R982
R981
IC901
J901
R984
R985
R986
R977
R978
R979
R954
R953
R949
R950
R951
R952
LED931
LCD901
R923
RE901
IC971
LSW911(2/2)
LSW903(2/2)
LSW904(2/2)
LSW905(2/2)
LSW906(2/2)
LSW907(2/2)
LSW912(2/2)
LED942
LED953
LED952
LED945
LED944
LSW908(2/2)
LSW909(2/2)
LSW910(2/2)
LSW901(2/2)
LSW902(2/2)
LED941
LED943
LED951
100
1.2k
15P
100
100
0
MA8051-M-TX
MA8051-M-TX
MA8051-M-TX
MA8051-M-TX
MA8068-M-TX
MA8180-M-TX
MA8068-M-TX
MA8068-M-TX
MA8068-M-TX
0.1
1.5k
RT1N140C
RT1N436C
220
220
0
220
820
1k
1k
1.2k
1.5k
1.8k
2.2k
3.3k
3.9k
5.6k
820
1k
1k
1.5k
0
0
0
120
220
470
470
820
820
470
470
330
330
100
0.1
MA8051-M-TX
1SS355TE-17
0.15
1M
0.22
0.1
39k
0.001
0.1
0.1
150
150
LC75836E
1k
1k
1k
100
100
100
470
470
120
220
120
220
NESW505CT-AST
0
RS-770
CL-197HB1E
CL-197HB1E
CL-197HB1E
CL-197HB1E
CL-197HB1E
CL-197HB1E
CL-197HB1E
CL-197HB1E
CE
DATA
CLK
CE
DATA
S
1
S
2
S
3
S
4
S
5
S6
S
7
S8
S9
S
1
0
S
1
1
S1
2
S1
3
S
1
4
S
1
5
S
1
6
S
1
7
S1
8
S
1
9
S2
0
S
2
1
S
2
2
S
2
3
S
2
4
S
2
5
S
2
6
S
2
7
S
2
8
S
2
9
S
30
S
3
1
S
3
2
S
3
3
CLK
C
O
M
1
C
O
M
2
C
O
M
3
C
O
M
4
S1
S2
S3
S4
S5
S6
S7
S
8
S
9
S
1
0
S
1
1
S
1
2
S1
3
S
1
4
S
1
5
S
1
6
S
17
COM3
COM4
S18
S
1
9
S
20
S
2
1
S
2
2
S
23
S
2
4
S
2
5
S
2
6
S
27
S
2
8
S29
S30
S31
S32
S33
C
O
M
1
C
O
M
2
KEY-1
KEY-0
DATA-LCD
CE-LCD
CLK-LCD
+B
PANEL
D-GND
AUX-L
AUX-R
AUX-GND
RE-0
RE-1
B
ACK-LIGHT
DIM
M
ER
KEY-DND
INH
OSC
VDD
VDD1
VDD2
DI
CL
CE
SIRCS
S8
S9
S10
S11
S12
S1
3
S14
S15
S16
S17
C
OM
1
C
OM
2
S7
S6
S5
S4
S3
S2
S1
S33
S32
S31
S30
S29
S1
9
S
20
S
21
S
22
S
23
S
24
S
25
S
26
S27
S
28
GND
COM3
COM4
S18
LCD DRIVER
DISC SLOT
ILLUMINATION
OFF
PAUSE
6
SCRL
AF/TA
(US,CND,E)
(AEP,UK)
(AEP,UK)
(US,CND,E)
BTM
PTY
BLUETOOTH
EQ
SOURCE
MODE
5
AUX
(LCD BACK LIGHT)
DIMMER
SWITCH
SWITCH
LED DRIVE
S1
S2
S
3
S4
S5
S6
S7
S8
S9
S10
S11
S12
S13
S14
S15
S16
S17
S18
S19
S20
S21
S
22
S23
S24
S25
S2
6
S27
S
28
S29
S30
S
31
S32
S33
COM
4
COM
3
C
OM
2
COM
1
LIQUID CRYSTAL DISPLAY
LSW912(1/2)
LSW911(1/2)
LSW910(1/2)
LSW909(1/2)
LSW908(1/2)
LSW907(1/2)
LSW906(1/2)
LSW905(1/2)
LSW904(1/2)
LSW903(1/2)
LSW901(1/2)
LSW902(1/2)
OFF
SOURCE
BLUETOOTH
EQ
(AEP,UK)
(US,CND,E)
PTY
BTM
SEEK+
SEEK-
MODE
DIM
DSPL
ALBM -
1
PAUSE
6
5
SHUF
4
REP
3
ALBM +
2
(US,CND,E)
(AEP,UK)
SCRL
AF/TA
ROTARY ENCODER
PUSH SELECT/
ROTARY ENCODER
PUSH SELECT/
(VOLUME)
LED951-953
(VOLUME)
SEEK+
SEEK-
DIM
DSPL
1
ALBM -
2
ALBM +
REP
3
SHUF
4
REMOTE CONTROL RECEIVER
(Page 31)
Note: Refer to the Servicing Notes “NOTE FOR REPLACEMENT
OF THE AUX JACK (J901)” (page 5), if replacing the Ref. No.
J901.
J901.
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