Read Sony CDX-A251C Service Manual online
19
19
CDX-A251C
CDX-A251C
3-4. BLOCK DIAGRAM — DISPLAY SECTION —
KEY ACK
ENABLE
Q664
X502
32.768kHz
79
80
82
83
41
28
29
27
40
52
76
77
SYSTEM CONTROL
IC501 (3/3)
LCD/LED DRIVER
IC901
KEYIN0
CE
LCD SO
LCD CKO
LCD CE
DIMMER
KEYIN1
31 RE-IN0
32 RE-IN1
71 RC IN1
43 RC IN0
KEY ACK
XKEY ON
3 AREASEL0
7 NOSE SW
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
D501 (1/2)
D501 (2/2)
D510
5
|
50
•
55
51
|
54
|
S1
S48
|
CL
DI
64
SIRCS
IR
LED901–904,906–909,
941–946,951,952
LSW910–918
941–946,951,952
LSW910–918
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
4
3
LCD BACK
LIGHT
SYS RST
CD
SECTION
C
MAIN
SECTION
D
S502
FREQUENCY
SELECT
(
)
BU+3.3V
E,MX
10K
9K
BACK LIGHT
LED CONTROL
Q931
LED DRIVER
(GREEN)
Q903
LED DRIVER
(AMBER)
Q902
•
60
J561
(REMOTE IN)
(Page 17)
(Page 18)
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