Read Sony CDX-F50M Service Manual online
32
CDX-F50M
• IC801 MB90487APF-G-125-BNDE1 (SYSTEM CONTROL) (MAIN BOARD (3/3))
Pin No.
Pin Name
I/O
Pin Description
1
ATT
O
Audio mute control signal output
2 to 4
NC
—
Not used in this set. (Open)
5
BEEP
O
Beep signal output to power amp IC
6
VOL ATT
O
Electrical volume ATT control output
7
ILL
I
Illumination check signal input for auto dimmer
8 to 10
NC
—
Not used in this set. (Open)
11
VSS
—
Ground pin
12 to 14
NC
—
Not used in this set. (Open)
15
TU ATT
O
Tuner mute control output
16 to 20
NC
—
Not used in this set. (Open)
21
RE 0
I
Rotary encoder signal input 0
22
RE 1
I
Rotary encoder signal input 1
23
VCC+3.3
—
Power supply pin (+3.3 V)
24
EEP SIO
I/O
Serial data signal input/output for EEPROM communication
25
EEP SCK
O
Serial clock signal output for EEPROM communication
26
SA CLK
O
Serial clock signal output for spectrum analyzer to electronic volume IC
27
LCD CE
O
Chip enable signal output to LCD driver IC Flash: serial in
28
LCD SO
O
Serial data signal output to LCD driver IC Flash: UART serial out
29
LCD SCK
O
Serial clock signal output to LCD driver IC
30
NC
—
Not used in this set. (Open)
31
STB
O
Standby signal output to power amp IC
32
AUX
O
Not used in this set. (Open)
33
IIC SCK
O
IIC bus serial clock signal output
34
IIC SIO
I/O
IIC bus serial data signal input/output
35
VCC+3.3
—
Power supply pin (+3.3 V) (for A/D converter)
36
AVRH+3.3
—
External reference power supply (+3.3 V) (for A/D converter)
37
AVSS
—
Ground pin (for A/D converter)
38, 39
KEY IN0, 1
I
Key signal input
40
SA DATA
I
Serial data signal input to electronic volume IC
41
RC IN0
I
Rotary commander key signal input
42
VSS
—
Ground pin
43, 44
NC
—
Not used in this set. (Fixed at “L”.)
45
VSM
I
S meter voltage detect signal input
46
DST SEL
I
Destination select pin
47
KEY ACK
I
Key acknowledge detect signal input
48
NC
—
Not used in this set. (Open)
49, 50
MD0, 1
I
Input for operation mode designation (Fixed at “H”.)
51
MD2
I
Input for operation mode designation (Fixed at “L”.)
52
NC
—
Not used in this set. (Open)
53
BU IN
I
Back up power supply detect signal input
54
OPEN REQ
I
Open REQ signal input
55
NC
—
Not used in this set. (Open)
56
DIAG
I
Condition input from power amp IC
57
NC
—
Not used in this set. (Open)
58
UNI SI
I
Serial data signal input
59
UNI SO
O
Serial data signal output
60
UNI SCK
O
Serial clock signal output
61
BUS ON
O
Bus on signal output
62
SYS RST
O
System reset signal output
63
TEL ATT
I
TEL ATT detect input
64
ACC IN
I
Accessory power supply detect signal input
65
SIRCS
I
Remote control signal (infrared rays) input
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