Read Sony CDX-A250 / CDX-A250EE Service Manual online
32
CDX-A250/A250EE
IC501 MB90487APF-G-191E1 (SYSTEM CONTROL) (MAIN BOARD (3/3))
Pin No.
Pin Name
I/O
Pin Description
1
AREASEL2
I
Destination setting pin
2
AREASEL1
I
Destination setting pin
3
AREASEL0
I
Destination setting pin
4
COL SW
I
Illumination color select signal input
5
BEEP
O
Beep signal output
6
CYRIL SEL
I
Cyril select signal input
7
NOSE SW
I
Front panel open/close detect signal input
8
DIAG
I
Power AMP status signal input
9
VOL ATT
O
Electronic volume attenuate control signal output
10
NCO
O
Not used. (Open)
11
VSS
—
Ground pin
12
TU ATT
O
Tuner mute control signal output
13
NS MASK
O
Noise mask signal output (AEP, UK model only)
14
ILLUMI SEL1
I
Illumination voltage setting signal input 1
15
ILLUMI SEL2
I
Illumination voltage setting signal input 2
16 to 22
NCO
O
Not used. (Open)
23
VCC5
—
Power supply pin (+3.3 V)
24
EEP SIO
I/O
EEPROM bus serial data input/output
25
EEP CKO
O
EEPROM bus serial clock output
26
AMP STB
O
Power AMP satandby signal output
27
LCD CE
O
LCD driver chip enable signal output
28
LCD SO
O
LCD driver serial data signal output
29
LCD CKO
O
LCD driver serial clock signal output
30
RDS ON
O
RDS ON signal output (AEP, UK model only)
31
RE IN0
I
Rotary encoder signal input 0
32
RE IN1
I
Rotary encoder signal input 1
33
I2C CKO
O
I2C bus serial clock signal output
34
I2C SIO
I/O
I2C bus serial data signal input/output
35
DAVDD
—
A/D converter power supply pin (+3.3 V)
36
AVRH
—
A/D converter external reference power supply pin (+3.3 V)
37
DAVSS
—
Ground pin
38
QUALITY
I
Noise detect signal input (AEP, UK model only)
39
VSM
I
S-meter voltage detect signal input
40
KEY IN1
I
Key signal input 1
41
KEY IN0
I
Key signal input 0
42
VSS
—
Ground pin
43
RC IN0
I
Rotary commander key signal input
44 to 48
NCO
O
Not used. (open)
49
MD0
I
Operation mode setting pin (Connect to VDD.)
50
MD1
I
Operation mode setting pin (Connect to VDD.)
51
MD2
I
Operation mode setting pin (Connect to VSS.)
Ver. 1.1
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