MEX-BT5100 - Sony Car Audio Service Manual (repair manual). Page 51

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MEX-BT5100
51
SERVO BOARD  IC3  MB90486BPMC-G-177E1 (CD SYSTEM CONTROL)
Pin No.
Pin Name
I/O
Description
1
CDON_1500MV
O
Servo 1.5 V power supply control signal output terminal
2 to 5
NC
-
Not used
6
DRVON
O
Motor drive muting on/off control signal output terminal
7, 8
CD_BUS0, CD_BUS1
I/O
Bus data input/output with the RF amplifi er
9
VSS
-
Ground terminal
10, 11
CD_BUS2, CD_BUS3
I/O
Bus data input/output with the RF amplifi er
12
CD_BUCK
O
Bus clock signal output to the RF amplifi er
13
CD_XCCE
O
Chip enable signal output to the RF amplifi er
14
CD_XRST
O
Reset signal output to the RF amplifi er
15
CD_ZDET
I
Zero detection signal input from the RF amplifi er
16 to 20
NC
-
Not used
21
VCC
-
Power supply terminal (+3.3 V)
22
DAC_ZDETL
I
Zero data detection signal input terminal (L-ch)    Not used
23
DAC_ZDETR
I
Zero data detection signal input terminal (R-ch)    Not used
24
NC
-
Not used
25
RXD
I
Serial data input from the SONY bus interface IC
26
TXD
O
Serial data output to the SONY bus interface IC
27
DEC_SSTBY
O
S-RAM standby mode control signal output to the RF amplifi er
28, 29
NC
-
Not used
30
DEC_INT
I
Request signal input from the RF amplifi er
31, 32
NC
-
Not used
33
AVCC
-
Power supply terminal (+3.3 V) for A/D converter
34
AVRH
-
External reference voltage for A/D converter
35
AVSS
-
Ground terminal
36
NC
-
Not used
37
DEC_XMUTE
O
Muting on/off control signal output to the RF amplifi er    "L": mute
38, 39
NC
-
Not used
40
VSS
-
Ground terminal
41
NC
-
Not used
42
MEC_LIMIT
I
Sled limit in detection switch signal input terminal
43
MEC_LOAD
O
Loading motor signal output to the coil/motor drive (Load direction)
44
MEC_EJECT
O
Loading motor signal output to the coil/motor drive (Eject direction)
45
MEC_INSW
I
Pack-in detection signal input terminal
46
MEC_DSW
I
Chucking end detection switch signal input terminal
47 to 49
MD0 to MD2
I
CPU operation mode setting terminal
50
BUS_ON
I
SONY bus on/off control signal input terminal    "L": bus on
51
BU_IN
I
Back up power supply detection signal input terminal    "L" is input at low voltage
52
NC
I
Not used
53
MEC_SELFSW
I
Disc insert detection switch signal input terminal    "L": disc in interruption
54, 55
NC
-
Not used
56
UNISI
I
Serial data input from the SONY bus interface IC
57
UNISO
O
Serial data output to the SONY bus interface IC
58
UNICKI
I
Serial data transfer clock signal input from the system controller
59
LINKOFF
O
Line off signal output terminal
60
A_ATT
O
Muting on/off control signal output terminal
61
XFLASH & EJECT_OK
I
CD eject OK signal input from the system controller
62
OPEN_REQ
O
Front panel open/close request signal output terminal    Not used
63
MECON
O
Mechanism deck power supply on/off control signal output terminal
64
CDON
O
CD servo power supply detection output terminal
65
XUART
I
Sony-bus/MC-bus change signal input terminal    Not used
66
ZMUTE
O
Muting on/off control signal output to the system controller
67
MECON_CHK
I
CD mecha +6V power rising detection signal input
68
CDON_CHK
I
CD servo +3.3V power rising detection signal input terminal
69 to 74
NC
-
Not used
75
RSTX
I
System reset signal input terminal
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