Sony CDX-GT20W Service Manual page 30

CDX-GT20W/GT200/GT200E/GT200S/GT250S
• IC Pin Descriptions
IC3 MB90486BPFV-G-158E1 (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
61 EJECT OK
62 OPEN REQ
63 MECON
30
I/O
O Servo 1.5 V power supply control signal output
— Not used. (Open)
O Motor drive on/off control signal output
I/O Bus data signal input/output 0
I/O Bus data signal input/output 1
— Ground pin
I/O Bus data signal input/output 2
I/O Bus data signal 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)
I Zero data detection signal input (R-ch)
— Not used. (Open)
I UART RXD data signal input (MCBUS/Flash data input)
O UART TXD data signal 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 pin
— Not used. (Open)
O Mute signal output
— Not used. (Open)
— Ground pin
— 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 (Connect to Vcc.)
I CPU operation mode designation signal input (Connect to Vss.)
I Bus on signal input
I Backup on/off signal input
— Not used. (Open)
I Disc insert detection switch signal input
— Not used. (Open)
I Serial data signal input
O Serial data signal output
I Serial clock signal input
O Line off signal output
O Audio attenuation signal output
I Front panel open signal input
O Front panel open/close request signal output
O Mechanism deck power supply control signal output
Pin Description
L: mute
L: bus on
H: backup on, L: backup off
L: disc in interruption
H: ATT on
H: eject
H: open request