Sony XR-4803 service manual Rel

Pin No.	Pin Name		I/O			Function
41	KEYACK		I	Input of acknowledge signal for the key entry			Acknowledge signal is input to accept function
				and eject keys in the power off status		On at input of “L”
42	BU IN		I	Battery detect signal input terminal	“H”: battery on
				METAL control in/out terminal
				At initial mode: auto/manual mode selection input of METAL function					“L”: manual mode
43	MTLSEL		I/O	At manual mode: METAL on/off control signal output to the CXA2509AQ (IC301)
				“H”: METAL on
				At auto mode: input at MTLIN (pin %»)
				Dolby control in/out terminal
44	DOLON		I/O	At initial mode: valid/invalid selection input of dolby function (“L” input: valid)
				At normal mode: dolby on/off control signal output				“H”: dolby on
				Not used this function in this set (fixed at “H”)
45	AMSIN		I	Whether a music is present or not from CXA2509AQ (IC301) is detected at auto music sensor
				“L”: music is present, “H”: music is not present
				Input of FM stereo detection signal from FM/AM tuner unit (TU1), and output of forced
46		ST	I/O	monaural control signal to FM/AM tuner unit (TU1)				(Commonly used for stereo display input
				and forced monaural output)
				FM stereo detection at input of “L”, forced monaural at output of “L”
47	AMS ON		O	Tape auto music sensor control signal output to the CXA2509AQ (IC301)
				“L” is output to lower the gain for audio level at FF/REW
48	N/R OUT		O	Forward/reverse direction control signal output to the CXA2509AQ (IC301)
				“L: forward direction, “H”: reverse direction
49	TAPMUT		O	Tape muting on/off control signal output to the CXA2509AQ (IC301)					“H”: tape muting on
				Power supply on/off control signal output terminal at the illumination and liquid crystal display
50	ILLON		O	driver (IC901) “H”: power on
				At power select switch (S501) on mode: “H” output at the accessory on
				At power select switch (S501) off mode: “H” output at the power on
51	SD IN		I	Station detector detect input from the FM/AM tuner unit (TU1)
				Stop level for SEEK, BTM, etc. is determined			SD is present at input of “H”
52	NOSESW		I	Detects the removal of the attaching and removing type front panel block “L”: attaching
53	TELMUTE		I	Telephone muting signal input terminal		At input of “L”, the signal is attenuated by –20 dB
				Not used (fixed at “H”)
54	REL		I	Reel table rotation detect signal input from the take-up and supply reel sensor
55	ACCIN		I	Accessory detect signal input terminal		“L”: accessory on
56	TESTIN		I	Setting terminal for the test mode	“L”: test mode (normally fixed at “H”)
57	RC IN1		I	Rotary remote commander shift key A/D input terminal
58	PW SEL		I	Power select switch (S501) input terminal
				“L”: position A (halt mode), “H”: position B (operation mode)
59	MTLIN		I	Input terminal to set whether the auto metal function is present or not
				“L”: auto metal function is present (fixed at “H”)
60	ADON		O	Power supply on/off control signal output for the A/D conversion
61	KEYSEL		I	Setting terminal for the key (fixed at “H”)
62	SEKOUTSEL		I	Active selection terminal for the SEKOUT (pin #¥) (fixed at “L”)
63	COLORSEL		I	Setting terminal for the illumination color “L”: amber, “H”: green Not used (fixed at “L”)
64	LCDCE		O	Chip enable output to the liquid crystal display driver (IC901)
65	LCDCKO		O	Serial data transfer clock signal output to the liquid crystal display driver (IC901)
66	LCDSO		O	Serial data output to the liquid crystal display driver (IC901)
67	LCDINH		O	Blank indicate control signal output to the liquid crystal display driver (IC901)
				“L”: no display
68	UNICKI		I	Serial data reading clock signal input terminal for the unilink Not used (connected to pin &Á)

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