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

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