CDX-GT50W/GT500/GT500EE/GT550

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

Not used. (Open)

 

 

 

 

 

 

 

 

 

 

6

 

 

DRVON

O

Motor drive on/off control signal output

 

 

 

 

 

 

 

 

 

7

 

CD BUS0

I/O

Bus data signal input/output 0

 

 

 

 

 

 

 

 

 

 

8

 

CD BUS1

I/O

Bus data signal input/output 1

 

 

 

 

 

 

 

 

 

 

 

9

 

 

VSS

Ground pin

 

 

 

 

 

 

 

 

 

 

 

10

 

CD BUS2

I/O

Bus data signal input/output 2

 

 

 

 

 

 

 

 

 

 

11

 

CD BUS3

I/O

Bus data signal 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

Not used. (Open)

 

 

 

 

 

 

 

 

 

 

 

21

 

 

VCC

Power supply pin (+3.3 V)

 

 

 

 

 

 

 

 

 

22

 

DAC ZDETL

I

Zero data detection signal input (L-ch)

 

 

 

 

 

 

 

 

23

 

DAC ZDETR

I

Zero data detection signal input (R-ch)

 

 

 

 

 

 

 

 

 

 

24

 

 

NC

Not used. (Open)

 

 

 

 

 

 

 

 

 

 

25

 

 

RXD

I

UART RXD data signal input (MCBUS/Flash data input)

 

 

 

 

 

 

 

 

26

 

 

TXD

O

UART TXD data signal output (MCBUS/Flash data output)

 

 

 

 

 

 

 

 

27

 

DEC SSTBY

O

SRAM STANDBY mode control signal output

 

 

 

 

 

 

 

 

 

 

28, 29

 

 

NC

Not used. (Open)

 

 

 

 

 

 

 

 

 

 

 

 

30

 

DEC INT

I

Request signal input

 

 

 

 

 

 

 

 

 

 

 

 

31, 32

 

 

NC

Not used. (Open)

 

 

 

 

 

 

 

 

 

 

33

 

 

AVCC

Power supply pin (+3.3 V) for A/D converter

 

 

 

 

 

 

 

 

34

 

 

AVRH

External reference voltage for A/D converter

 

 

 

 

 

 

 

 

 

 

35

 

 

AVSS

Ground pin

 

 

 

 

 

 

 

 

 

 

 

 

36

 

 

NC

Not used. (Open)

 

 

 

 

 

 

 

 

 

 

 

 

37

 

DEC XMUTE

O

Mute signal output

L: mute

 

 

 

 

 

 

 

 

 

 

 

38, 39

 

 

NC

Not used. (Open)

 

 

 

 

 

 

 

 

 

 

 

 

40

 

 

VSS

Ground pin

 

 

 

 

 

 

 

 

 

 

 

 

41

 

 

NC

Not used. (Open)

 

 

 

 

 

 

 

 

 

 

42

 

MEC LIMIT

I

Sled limit in detection switch signal input

 

 

 

 

 

 

 

 

43

 

MEC LOAD

O

Loading motor signal output (Load direction)

 

 

 

 

 

 

 

 

44

 

MEC EJECT

O

Loading motor signal output (Eject direction)

 

 

 

 

 

 

 

 

 

45

 

MEC INSW

I

Pack-in detection signal input

 

 

 

 

 

 

 

 

 

46

 

MEC DSW

I

Chucking end detection switch signal input

 

 

 

 

 

 

 

 

47, 48

 

MD0, MD1

I

CPU operation mode designation signal input (Connect to Vcc.)

 

 

 

 

 

 

 

 

49

 

 

MD2

I

CPU operation mode designation signal input (Connect to Vss.)

 

 

 

 

 

 

 

 

 

 

50

 

 

 

 

 

I

Bus on signal input

L: bus on

 

BUS ON

 

51

 

 

BU IN

I

Backup on/off signal input H: backup on, L: backup off

 

 

 

 

 

 

 

 

 

 

52

 

 

NC

Not used. (Open)

 

 

 

 

 

 

 

 

 

 

53

 

 

 

I

Disc insert detection switch signal input L: disc in interruption

MEC SELFSW

54, 55

 

 

NC

Not used. (Open)

 

 

 

 

 

 

 

 

 

 

 

56

 

 

UNISI

I

Serial data signal input

 

 

 

 

 

 

 

 

 

 

57

 

 

UNISO

O

Serial data signal output

 

 

 

 

 

 

 

 

 

 

58

 

 

UNICKI

I

Serial clock signal input

 

 

 

 

 

 

 

 

 

 

 

59

 

LINKOFF

O

Line off signal output

 

 

 

 

 

 

 

 

 

 

 

60

 

 

A ATT

O

Audio attenuation signal output

H: ATT on

 

 

 

 

 

 

 

 

 

61

 

EJECT OK

I

Front panel open signal input

H: eject

 

 

 

 

 

 

 

 

62

 

OPEN REQ

O

Front panel open/close request signal output H: open request

 

 

 

 

 

 

 

 

63

 

 

MECON

O

Mechanism deck power supply control signal output

36

Page 36
Image 36
Sony CDX-GT50W, CDX-GT500EE, CDX-GT550 service manual IC Pin Descriptions