Read Sony CDX-A250 / CDX-A250EE Service Manual online
17
17
CDX-A250/A250EE
CDX-A250/A250EE
3-3. BLOCK DIAGRAM — DISPLAY SECTION —
3-4. CIRCUIT BOARDS LOCATION
KEY ACKNOWLEDGE
SWITCH
Q664
X502
32.678kHz
79
80
82
83
41
28
29
27
40
52
76
77
SYSTEM CONTROL
IC501 (3/3)
LCD DRIVER
IC901
KEYIN0
CLK
CE
LCD SO
LCD CKO
LCD CE
DIMMER
KEYIN1
31 RE-IN0
32 RE-IN1
KEY ACK
XKEY ON
3 AREASEL0
7 NOSE DET
88 SYS RST
RESET
2
1
XIN
XOUT
OSC IN
OSC OUT
X501
18.432MHz
S702
RESET
63
64
62
2
COM4
COM1
LCD901
LIQUID
CRYSTAL
DISPLAY
PANEL
D503
D510
5
|
50
•
55
51
|
54
|
S1
S48
|
CL
DI
CE
64
SIRCS
IR
LED901–904,906–909,
941–946,951,952
LSW910–918
941–946,951,952
LSW910–918
LCD BACK LIGHT
LED DRIVE
Q932
LED931,932
PANEL+B
REMOTE CONTROL
SIGNAL REVEIVER
IC971
2 OUT
BU+3.3V
SYS RST
(
)
KEY MATRIX
RESET
IC602
LSW910–918,
S901–904,906–909
(VOLUME)
PUSH DIAL SELECT
RE901
ROTARY
ENCODER
VDD VOUT
BACK LIGHT
1
LCD BACK
LIGHT
CD
SECTION
C
S502
FREQUENCY
SELECTOR
(
)
BU+3.3V
E,CH,IND MODEL
10K
9K
DIMMER
LED DRIVE
Q931
•
60
• Abbreviation
CH : Chinese model
IND : Indian model
IND : Indian model
MAIN board
JACK board
KEY board
SENSOR board
SERVO board
tuner unit
(TU1)
(TU1)
(Page 15)
Ver. 1.2
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