Sony MZ-R50 service manual Pin No, Pin name, Description

Pin No.	Pin name	I/O			Description
51	AVREF	I	A/D converter reference voltage input.
52	AVDD	–	A/D converter power supply terminal.
53	AM3 MNT	I	AC adaptor or EXT battery detection input.			L : EXT battery
54	TEMP	I	Temp meter (IC803) input.
55	KEY3	I	PLAY/REC key input.
56	KEY4	I	Key input.
57	KEY0	I	Key input.
58	KEY1	I	Key input.
59	UNREG MNT	I	UNREG voltage monitor.
60	LIP MNT	I	Voltage monitor for lithium battery.
61	FG IN	I	FG input from motor driver (IC701).
62	SLA	I	JOG dial signal input.
63	SLB	I
64	INT SW	I	INITIAL switch input.
65	PACK IN	I	MEDIA switch input.
66	JACKDET	I	Input jack detection input.
67	OPT DET	I	Detecting input an optical input.
68	MIC DET	I	MIC jack detection.
69	XLAT	O	Latch output.
70	KEY ON	O	TRACK MARK jack input.
71	ST1 A	O	Stepping motor control signal output.
72	ST2 A	O
73	––––		–	Not used (Open).
74	––––		–	Not used (Open).
75	DQSY	I	Subcode Q sync (SCOR) of digital in U-bit CD format from IC503.
76	T COUNT	I	Traverse count signal input.
77	SDI1	I	Serial data input.
78	SDO1	O	Serial data output.
79	SCK1	O	Serial clock output.
80	SQSY	I	SUB-Q/ADIP SYNC input.
81	BEEP	O	BEEP sound output control. H : BEEP sound output
82	XLIP DET	I	This is at “L” level when using the lithium battery or with no sensor switch input.
83	REFLCT	I	CD/MO discrimination switch.
84	TEX	–	Not used (Fixed at “L”)
85	XT	–	Not used (Open).
86	VSS	–	Ground.
87	VDD	–	Power supply pin (+2.8V).
88	NC	–	Not used (Fixed at “H”)
89	XCS ADA	I	Chip select input.
90	XPD ADA	O	D/A converter power down detect during recording.			H : Power down
91	ST1B	O	Stepping motor control signal output.
92	ST2B	O
93	A MUTE	O	Analog mute control.		L : Mute
94	OPT CONT	O	Power supply control output for an optical input.
95	CS EVR	O	Chip select output.
96	CS NV	O
97	SCK2	O	Serial clock output.
98	–––––––			O HF module control output. (Not used : open)
99	SDO2	O	Serial data output.
100	XLIP	O	Charge control.		H : Charge

– 38 –