Sony CDX-A251C Service Manual ▷ View online
33
CDX-A251C
IC750 TDA8588AJ/N2/R1 (US, CND, E, MX model) (MAIN Board (2/4))
IC750 TDA8589AJ/N2/R1/M5 (AEP, UK model) (MAIN Board (2/4))
IC750 TDA8589AJ/N2/R1/M5 (AEP, UK model) (MAIN Board (2/4))
MUTE
MUTE
ENABLE
LOGIC
STANDBY/
MUTE
BATTERY
DETECTION
CHIP DETECT/
DIAGNOSTIC
PROTECTION/
DIAGNOSTIC
SWITCH
REGULATOR
SWITCH
REFERENCE
VOLTAGE
LOADDUMP
PROTECTION
TEMPERATURE
PROTECTION
BACK-UP
SWITCH
REGULATOR
1
3
5
7
9
11
13
15
17
19
21
23
25
27
29
31
33
35
37
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
TAB
OUT-FL-
OUT-FL+
OUT-RL-
OUT-RL+
IN-RL
S-GND
IN-RR
OUT-RR+
OUT-RR-
OUT-FR+
OUT-FR-
DIAG
ANT-REM
AMP-REM
SERVO3.3V
MECH6V
VP
B.UP+B
SDA
SCL
VP2
PGND3
SVR
IN-FL
IN-FR
BEEP
PGND2
VP1
STB
PGND1
RST
CRES
AUDIO8.3V
GND
PANEL+B
CBU
FL
RL
RR
VP
FR
I
2
C BUS
IC580 BA8271F-E2 (MAIN Board (4/4))
1
2
3
4
5
5
6
7
8
9
10
14
13
12
11
BUS ON
SWITCH
RESET
SWITCH
BATTERY
SWITCH
BUS ON
RST
BATT
CLK
VREF
GND
VCC
RESET
BUS ON
BUS ON
CLK IN
BU IN
DATA IN
DATA OUT
DATA
34
CDX-A251C
• IC Pin Descriptions
IC3 MB90486BPFV-G-177E1 (CD SYSTEM CONTROL) (SERVO BOARD (2/2))
Pin No.
Pin Name
I/O
Pin Description
1
CDON_1500MV
O
Servo 1.5 V power supply control signal output
2 to 5
NC
O
Not used. (Open)
6
DRVON
O
Motor drive mute signal output
7
CD_BUS0
I/O
Bus data input/output 0
8
CD_BUS1
I/O
Bus data input/output 1
9
VSS
—
Ground
10
CD_BUS2
I/O
Bus data input/output 2
11
CD_BUS3
I/O
Bus data input/output 3
12
CD_BUCK
O
Bus clock signal output
13
CD_XCCE
O
Chip enable signal output
14
CD_XRST
O
Reset signal output
15
CD_ZDET
I
Zero detection signal input
16 to 20
NC
O
Not used. (Open)
21
VCC
—
Power supply pin (+3.3 V)
22
DAC_ZDETL
I
Zero data detection signal input (L-ch) (Fixed at L in this set)
23
DAC_ZDETR
I
Zero data detection signal input (R-ch) (Fixed at L in this set)
24
NC
O
Not used. (Open)
25
RXD
I
UART RXD data input (MCBUS/flash data input)
26
TXD
O
UART TXD data output (MCBUS/flash data output)
27
DEC_SSTBY
O
SRAM standby mode control signal output
28, 29
NC
O
Not used. (Open)
30
DEC_INT
I
Request signal input
31, 32
NC
O
Not used. (Open)
33
AVCC
—
Power supply pin for A/D converter. (+3.3 V)
34
AVRH
—
External reference power supply pin for A/D converter. (+3.3 V)
35
AVSS
—
Ground for A/D converter.
36
NC
O
Not used. (Open)
37
DEC_XMUTE
O
Mute signal output (L: mute)
38, 39
NC
O
Not used. (Open)
40
VSS
—
Ground
41
NC
O
Not used. (Open)
42
MEC_LIMIT
I
Sled LIMIT in switch detection signal input
43
MEC_LOAD
O
Loading motor control signal output (Loading direction)
44
MEC_EJECT
O
Loading motor control signal output (Eject direction)
45
MEC_INSW
I
DISC IN switch detection signal input
46
MEC_DSW
I
DOWN switch detection signal input
47, 48
MD0, MD1
I
Input for operation mode designation. (Fixed at H in this set)
49
MD2
I
Input for operation mode designation. (Connect to VSS in this set)
50
BUS_ON
I
Bus on signal input (L: bus on)
51
BU_IN
I
Backup power supply detection signal input
52
NC
O
Not used. (Open)
53
MEC_SELFSW
I
SELF load position detection switch signal input
54, 55
NC
O
Not used. (Open)
56
UNISI
I
SONY-BUS data signal input
57
UNISO
O
SONY-BUS data signal output
58
UNICKI
I
SONY-BUS clock signal input
59
LINKOFF
O
Link off signal output
60
A_ATT
O
Audio attenuator signal output
35
CDX-A251C
61
EJECT_OK
I
Eject OK signal input
62
OPEN_REQ
O
Front panel open/close request signal output
63
MECON
O
CD mechanism deck power supply control signal output
64
CDON
O
CD power supply control signal output
65
XUART
I
SONY-BUS/MC-BUS change signal input (Fixed at H: SONY-BUS in this set)
66
ZMUTE
O
Z mute signal output
67
MECON_CHK
I
MECHA +6V power rising detection signal input
68
CDON_CHK
I
SERVO +3.3V power rising detection signal input
69 to 74
NC
O
Not used. (Open)
75
RSTX
I
System reset signal input
76
NC
O
Not used. (Open)
77
X1A
—
Not used. (Open)
78
X0A
—
Not used. (Connect to VSS)
79
VSS
—
Ground
80
X0
I
Main-clock signal input (12 MHz)
81
X1
O
Main-clock signal output (12 MHz)
82
VCC
—
Power supply pin (+3.3 V)
83
XWD
I
Not used. (Open)
84
XINIT3
I
Not used. (Open)
85
NC
O
Not used. (Open)
86
XSJIG
I
Not used. (Open)
87
XINIT0
I
Not used. (Open)
88
XINIT1
I
Not used. (Open)
89
XINIT2
I
Not used. (Open)
90 to 96
NC
O
Not used. (Open)
97
XDES
I
Destination setting pin
98
XLINE
I
Not used. (Open)
99, 100
NC
O
Not used. (Open)
Pin No.
Pin Name
I/O
Pin Description
36
CDX-A251C
IC501 MB90487APF-G-171E1 (SYSTEM CONTROL) (MAIN BOARD (3/4))
Pin No.
Pin Name
I/O
Pin Description
1
AREASEL2
I
Destination setting pin (L: US, CND, E, MX model, H: AEP, UK model)
2
AREASEL1
I
Destination setting pin (L: AEP, UK, E, MX model, H: US, CND model)
3
AREASEL0
I
Destination setting pin (L: 9K, H: 10K)
4
COL_SW
I
Illumination color select signal input (Fixed at H in this set)
5
BEEP
O
Beep signal output to power amp IC.
6
CYRIL_SEL
I
Cyril select signal input (Fixed at L in this set)
7
NOSE_SW
I
Front panel detach detection signal input
8
DIAG
I
Status signal input from power amp IC.
9
VOLATT
O
Attenuator control signal output to electronic volume IC.
10
NCO
O
Not used. (Open)
11
VSS
—
Ground
12
TUATT
O
Tuner mute control signal output
13
NSMASK
O
Noise mask signal output (AEP, UK model)
14
ILLUMI_SEL1
I
Illumination voltage setting pin (Fixed at L in this set)
15
ILLUMI_SEL2
I
Illumination voltage setting pin (Fixed at H in this set)
16 to 22
NCO
O
Not used. (Open)
23
VCC5
—
Power supply pin (+3.3 V)
24
EEP_SIO
I/O
Serial data signal input/output for EEPROM communication.
25
EEP_CKO
O
Serial clock signal output for EEPROM communication.
26
AMPSTB
O
Standby signal output to power amp IC.
27
LCD_CE
O
Chip enable signal output to LCD drive IC.
28
LCD_SO
O
Serial data signal output to LCD drive IC.
29
LCD_CKO
O
Serial clock signal output to LCD drive IC.
30
RDS_ON
O
RDS ON signal output (AEP, UK model)
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
—
Power supply pin for A/D converter. (+3.3 V)
36
AVRH
—
External reference power supply pin for A/D converter. (+3.3 V)
37
DAVSS
—
Ground for A/D converter.
38
QUALITY
I
Noise detection signal input (AEP, UK model)
39
VSM
I
S meter voltage detection signal input
40
KEYIN1
I
Key signal input 1
41
KEYIN0
I
Key signal input 0
42
VSS
—
Ground
43
RC_IN0
I
Rotary commander key signal input
44 to 48
NCO
O
Not used. (Open)
49, 50
MD0, MD1
I
Signal input for operation mode designation. (Fixed at H in this set)
51
MD2
I
Signal input for operation mode designation. (Fixed at L in this set)
52
KEYACK
I
Key acknowledge detection signal input
53
TU_ATTIN
I
Tuner mute zero cross detection signal input (AEP, UK model)
54
BUIN
I
Backup power supply detection signal input
55
NCO
O
Not used. (Open)
56
DAVN
I
RDS data block synchronized detection signal input from RDS demodulator IC.
(AEP, UK model)
57
NCO
O
Not used. (Open)
58
UNISI
I
SONY-BUS data signal input
59
UNISO
O
SONY-BUS data signal output
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