Read Sony CDX-M730 Service Manual online
25
CDX-M730
• IC301 HD6432355A44F (SUB SYSTEM CONTROL)
Pin No.
Pin Name
I/O
Pin Description
1
SA CLK
O
Spectrum analyzer clock signal output to electronic volume (IC305)
2
NCO
O
Not used. (Open)
3
VSS
—
Ground pin
4
NC
—
Not used. (Open)
5
VCC
—
Power supply pin (+5 V)
6 to 9
NCO
O
Not used. (Open)
10
VSS
—
Ground pin
11 to 18
NCO
O
Not used. (Open)
19
VSS
—
Ground pin
20 to 27
NCO
O
Not used. (Open)
28
VSS
—
Ground pin
29 to 31
NCO
O
Not used. (Open)
32
SA EN
I
Spectrum analyzer enable signal input from system control (IC801)
33
NCO
O
Not used. (Open)
34
BU IN
I
Back-up voltage detect signal input from bus interface (IC802)
35, 36
VSS
—
Ground pin
37
NCO
O
Not used. (Open)
38
BUS ON
I
BUS ON signal input from system control (IC801)
39
VCC
—
Power supply pin (+5 V)
40 to 43
NCO
O
Not used. (Open)
44
VSS
—
Ground pin
45
NCO
O
Not used.
46
LED SW1
I
Illumination select control 1 signal input from system control (IC801)
47
LED SW2
I
Illumination select control 2 signal input from system control (IC801)
48, 49
NCO
O
Not used. (Open)
50
LINK OFF
O
LINK OFF signal output
51
NCO
O
Not used. (Open)
52
ILL ON
O
Illumination control signal output
53
VSS
—
Ground pin
54 to 56
NCO
O
Not used. (Open)
57
BOOT
I
Display CPU write-in control signal input from system control (IC801)
58
VCC
—
Power supply pin (+5 V)
59
NCO
O
Not used. (Open)
60
TX/LCD SO
O
LCD data output/UART signal output
61
NCO
O
Not used.
62
RX
I
UART signal input
63
NCO
O
Not used.
64
LCD CKO
O
LCD clock signal output to LCD driver (IC1, 60 and 61)
65
VSS
—
Ground pin
66
LCD CE0
O
LCD driver chip enable 1 signal output to LCD driver (IC60)
67, 68
VSS
—
Ground pin
69
LCD INH
O
LCD driver inhibit signal output to LCD driver (IC1, 60 and 61)
70
LCD CE1
O
LCD driver chip enable 2 output to LCD driver (IC61)
71
LCD CE2
O
LCD driver chip enable 3 output to LCD driver (IC1)
72 to 78
NCO
O
Not used. (Open)
79
FL W
O
Not used. (Open)
80
VCL
I
Connecting to ground through a capacitor. Not used in this set. (Open)
81
RES
I
Reset signal input
82
NMI (H)
I
Non maskable interrupt signal input
83
ST/SY (H)
I
Stanby mode signal input
84
VCC
—
Power supply pin (+5 V)
85
XTAL
—
Crystal oscillator (18.43 MHz)
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