Read Sony CDX-C5050X Service Manual online
19
• IC801 MN101C49KTB (SYSTEM CONTROL) (MAIN BOARD)
Pin No.
Pin Name
I/O
Pin Description
1
VREF–
—
Ground for A/D converter power supply
2
S METER
I
S meter voltage detect signal input
3
FM AGC
I
FM auto gain control signal input
4
KEY IN1
I
KEY signal input
5
KEY IN0
I
KEY signal input
6
DSTSEL
I
Not used.
7
RC IN0
I
Rotary commander signal input
8
FUNC SEL
I
Model function selection pin
9
NIL
—
Ground
10
VREF+
—
A/D converter power supply
11
VDD
—
Power supply (+5 V) input pin
12
OSC OUT
O
High speed clock signal output (18.432 MHz)
13
OSC IN
I
High speed clock signal input (18.432 MHz)
14
VSS
—
Ground for power supply
15
XI
I
Low speed clock signal input (32 kHz)
16
XO
O
Low speed clock signal output (32 kHz)
17
MMOD
—
Not used. (Fixed at “L”.) Memory mode select signal input
18
RC IN1
I
Rotary commander shift key signal input
19
SYSRST
O
System reset signal output
20
BUS ON
O
Bus on control signal output
21
LCD DATA
O
LCD serial data signal output
22
LCD CE
O
LCD chip enable signal output
23
LCD CLK
O
LCD serial clock signal output
24
ILL ON
O
Illumination power supply control signal output
25
DOOR IND
O
Control signal output for power on sub panel when open to front panel
26
KEY ACK
I
Key active interrupt detect signal input
27
NOSE
I
Front panel attachment detection input
28
BU IN
I
Back up power supply setect signal input
29
SIRCS
I
Remote control signal input
30, 31
NC
—
Not used. (Fixed at “L”.)
32
RAM
—
Not used.
33
RESET
I
Reset signal input
34
NC
—
Not used.
35
BEEP
O
Beep signal input
36
NC (FUNC SEL)
I
Model function selection pin
37
NC (FUNC SEL)
I
Model function selection pin
38 – 40
NC
—
Not used.
41
UNI CLI
I
Bus system serial clock signal input
42
UNI SO
O
Bus system serial interface signal output
43
UNI SI
I
Bus system serial interface signal input
44
UNI CLO
O
Bus system serial clock signal output
45
SDA
I/O
I2C bus serial data signal input/output
46
NC
—
Not used.
47
SCL
O
I2C bus serial clock signal output
48, 49
NC
—
Not used.
50
LOCK
I
Check when remove to lock of MDNO CLV SERVO
51 – 63
NC
—
Not used.
64
ACC IN
I
Accessory power supply voltage detection input
65
TEL MUT
I
Telephone attenuate detect signal input
66
TEST IN
I
Test mode setting detect first stage signal input
67
ANT CUT
—
Not used.
68
NC
—
Not used.
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