Sony mex-1gp Service Manual page 36

MEX-1GP
• IC PIN DESCRIPTIONS
• IC3 MB90486BPFV-G-177E1 (CD SYSTEM CONTROL) (SERVO BOARD (2/2))
Pin No. Pin Name
1 CDON_1500MV
2 to 5 NC
6 DRVON
7 CD_BUS0
8 CD_BUS1
9 VSS
10 CD_BUS2
11 CD_BUS3
12 CD_BUCK
13 CD_XCCE
14 CD_XRST
15 CD_ZDET
16 to 20 NC
21 VCC
22 DAC_ZDETL
23 DAC_ZDETR
24 NC
25 RXD
26 TXD
27 DEC_SSTBY
28, 29 NC
30 DEC_INT
31, 32 NC
33 AVCC
34 AVRH
35 AVSS
36 NC
37 DEC_XMUTE
38, 39 NC
40 VSS
41 NC
42 MEC_LIMIT
43 MEC_LOAD
44 MEC_EJECT
45 MEC_INSW
46 MEC_DSW
47, 48 MD0, MD1
49 MD2
50 BUS_ON
51 BU_IN
52 NC
53 MEC_SELFSW
54, 55 NC
56 UNISI
57 UNISO
58 UNICKI
59 LINEOFF
60 A_ATT
36
I/O
O Servo 1.5 V power supply control signal output
— Not used. (Open)
O Motor drive mute signal output
I/O Bus data input/output 0
I/O Bus data input/output 1
— Ground
I/O Bus data input/output 2
I/O Bus data input/output 3
O Bus clock signal output
O Chip enable signal output
O Reset signal output
I Zero detection signal input
— Not used. (Open)
— Power supply pin (+3.3 V)
I Zero data detection signal input (L-ch) (Connected to Vss)
I Zero data detection signal input (R-ch) (Connected to Vss)
— Not used. (Open)
I UART RXD data input (MCBUS/Flash data input)
O UART TXD data output (MCBUS/Flash data output)
O SRAM STANDBY mode control signal output
— Not used. (Open)
I Request signal input
— Not used. (Open)
— Power supply pin (+3.3 V) for A/D converter
— External reference voltage for A/D converter
— Ground
— Not used. (Open)
O Mute signal output
— Not used. (Open)
— Ground
— Not used. (Open)
I Sled limit in detection switch signal input
O Loading motor signal output (Load direction)
O Loading motor signal output (Eject direction)
I Pack-in detection signal input
I Chucking end detection switch signal input
I CPU operation mode designation signal input (Connected to Vcc.)
I CPU operation mode designation signal input (Connected to Vss.)
I Bus on signal input
I Backup on/off signal input
I Not used. (Open)
I Disc insert detection switch signal input
— Not used. (Open)
I Serial data input
O Serial data output
I Serial clock input
O Line off signal output
O Audio attenuation signal output
Pin Description
L: mute
L: bus on
H: backup on, L: backup off
L: disc in interruption
H: ATT on