Sony MDS-JB920 service manual

MDS-JB920

Pin No.	Pin Name	I/O		Function
59	WR-PWR	O	Laser power select signal output to the CXD2654R (IC121) and HF module switch circuit
			“H”: recording mode, “L”: playback mode
60	MNT3 (SLOCK)	I	Spindle servo lock status monitor signal input from the CXD2654R (IC121)
61	SDA	I/O	Two-way data bus with the EEPROM (IC171)
62	+3.3V	—	Power supply terminal (+3.3V)
63	NC	I	Not used (fixed at “L”)
64	GND	—	Ground terminal
			Recording data output enable signal output to the CXD2654R (IC121) and overwrite head
65	SCTX	O	driver (IC181) Writing data transmission timing output (Also serves as the magnetic head on/off
			output)
66	SCL	O	Clock signal output to the EEPROM (IC171)
67	MNT0 (FOK)	I	Focus OK signal input from the CXD2654R (IC121)
			“H” is input when focus is on (“L”: NG)
68	LIMIT-IN	I	Detection input from the sled limit-in detect switch (S101)
			The optical pick-up is inner position when “L”
			Laser modulation select signal output to the HF module switch circuit
			Playback power: “H”, Stop: “L”,
			Recording power:
				0.5 sec
69	MOD	O
				2 sec
70	XLATCH	O	Serial data latch pulse signal output to the CXD2654R (IC121)
71	NC	I	Not used (fixed at “L”)
72	REC/PB	I	Not used (fixed at “L”)
73	PACK-IN	I	Detection input from the disc detect switch Not used (fixed at “L”)
74	PB-P	I	Detection input from the playback position detect switch (S604)		“L” active
75	CHACK IN	I	Detection input from the disc chucking-in detect switch (S603)		“L”: chucking
76	PACK-OUT	I	Detection input from the loading-out detect switch (S602)
			“L” at a load-out position, others: “H”
77	REC-P	I	Detection input from the recording position detect switch (S601)		“L” active
78	LDIN	O	Motor control signal output to the loading motor driver (IC400)		“L” active	*1
79	LDOUT	O	Motor control signal output to the loading motor driver (IC400)		“L” active	*1
80	LD-LOW	O	Loading motor drive voltage control signal output for the loading motor driver (IC400)
			“H” active
81	NC	I	Not used (fixed at “L”)
82	A1OUT	O	Sircs remote control signal output of the S-LINK CONTROL A1
83	MUTE	O	Audio line muting on/off control signal output terminal “L”: line muting on
84	STB	O	Strobe signal output to the power supply circuit “H”: power on, “L”: standby mode

*1 Loading motor (M103) control

	Mode	LOADING	EJECT	BRAKE	RUN IDLE
Terminal
	LDIN (pin &¥)	“L”	“H”	“L”	“H”
	LDOUT (pin &»)	“H”	“L”	“L”	“H”

Pin No.	Pin Name		I/O		Function
85	COAX/XOPT		O	Optical in 1/2 or coaxial in selection signal output to the digital input selector (IC300)
				“L”: OPT 1/2, “H”: COAXIAL
86	OPT2/XOPT1		O	Optical in 1 or optical in 2 selection signal output to the digital input selector (IC300)
				“L”: OPT 1, “H”: OPT 2
87	DALATCH		O	Serial data latch pulse signal output to the D/A converter (IC200)
88		DARST	O	Reset signal output to the A/D converter (IC100) and D/A converter (IC200) “L”: reset
89		LED0	O	LED drive signal output terminal	Not used (pull down)
90		LED1	O	LED drive signal output terminal	Not used (pull down)
91		TIMER	I	TIMER switch (S751) input terminal (A/D input)
				“L”: PLAY, “H”: REC (OFF: center voltage)
92	SOURCE		I	INPUT switch (S741) input terminal (A/D input)
93		KEY3	I	Key input terminal (A/D input)	S731 to S734 (TIME, FADER, MUSIC SYNC, MEGA
				CONTROL keys input)
94		KEY2	I	Key input terminal (A/D input)	S722 to S726 (PLAY/MODE, REPEAT, SCROLL/CLOCK
				SET, DISPLAY/CHAR, I/u keys input)
95		KEY1	I	Key input terminal (A/D input)	S711 to S714 and S716 (MENU/NO, YES, PUSH ENTER, ¤
				EJECT keys input)
96		AVSS	—	Ground terminal
97		KEY0	I	Key input terminal (A/D input)	S701 to S706 (r REC, p, ), 0, P, á keys input)
98		VREF	I	Reference voltage (+3.3V) input terminal (for A/D converter)
99		+3.3V	—	Power supply terminal (+3.3V) (for analog system )
100	MONO/ST		I	REC MODE switch (S746) input terminal “L”: MONO, “H”: STEREO

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