Sony MZ-R91 service manual

Pin No.	Pin Name		I/O				Description
39		FFCLR	O	Input latch output for starting signal to the MPC18A31FTA (IC901)
40		SLEEP	O	System sleep control signal output to the MPC18A31FTA (IC901) “H”: sleep on
41	TSB EDGE		I	TSB slave edge detect signal input terminal
42		GND SW	O	Ground line switching signal output terminal
43		XRST	I	System reset signal input from the MPC18A31FTA (IC901) “L”: reset
				For several hundreds msec. after the power supply rises, “L” is input, then it changes to “H”
44		VSS	—	Ground terminal
45		XTAL	O	Main system clock output terminal (16.9344 MHz)
46		EXTAL	I	Main system clock input terminal (16.9344 MHz)
47		VDD	—	Power supply terminal (+2.4V)
48	TSB SLV CTL		I/O	Two-way control signal bus with TSB slave circuit
49	SPDL START		O	Spindle servo start switching signal output to the analog switch (IC504, 505)
		SW
50	OPEN CLOSE		I	Upper panel open/close detect switch (S801) input terminal (A/D input)
		SW		“L”: upper panel close, “H”: upper panel open
51	XSHOCK		I	Recording shock detect signal input from the CXD2660GA (IC502)
52		FOK	I	Focus OK signal input from the CXD2660GA (IC502) “H”: is input when focus is on (“L”: NG)
53		SQSY	I	Subcode Q sync (SCOR) input from the CXD2660GA (IC502)
				“L” is input every 13.3 msec	Almost all, “H” is input
54		DQSY	I	Digital In U-bit CD format subcode Q sync (SCOR) input from the CXD2660GA (IC502)
				“L” is input every 13.3 msec	Almost all, “H” is input
55		XINT	I	Interrupt status input from the CXD2660GA (IC502)
56		T.MARK	I	T MARK switch (S803) input terminal
57	REC WBL SW		O	Stable control signal is output when recording
58		SERON	O	Series power supply control signal output to the MPC18A31FTA (IC901)
59		XCHG	O	Charge control signal output to the MPC18A31FTA (IC901)
60		XTEST	I	Setting terminal for the test mode		“L”: test mode, normally: fixed at “H”
61	SET CODE0		I	Destination setting terminal	Fixed at “L” in this set
62	SET CODE1		I	Destination setting terminal	Fixed at “L” in this set (US, canadian model: Not used (open))
63	SET CODE2		I	Destination setting terminal	Fixed at “L” in this set (US, canadian model: Not used (open))
64	REG CTL PWM		O	Synchronizing external clock signal output to the MPC18A31FTA (IC901)
65	VRM PWM		O	VREM power supply voltage control PWM signal output to the MPC18A31FTA (IC901)
66	VC PWM		O	System power supply voltage control PWM signal output to the MPC18A31FTA (IC901)
67	SPDL PWM		O	Spindle servo drive voltage control PWM signal output to the MPC17A56FTA (IC601)
68		XIC RST	O	Reset signal output to the A/D, D/A converter (IC301), SN761056ADBT (IC501) and
				CXD2660GA (IC502) “L”: reset
69	REC LED		O	REC LED drive signal output terminal			“H”: LED on
70		SI1	I	Joint text data input from the remote commander with headphone
71		SO1	O	Joint text data output to the remote commander with headphone
72		SCK1	O	Joint data communication clock output to the remote commander with headphone
73	XHOLD SW		I	HOLD switch (S804) input terminal			“L”: hold on, “H”: hold off
74		VDD	—	Power supply terminal (+2.4V)
75		TEX	I	Sub system clock input terminal		Not used (open)
76		TX	O	Sub system clock output terminal		Not used (open)
77		VSS	—	Ground terminal
78		VBKAN	I	Sub power supply input terminal
79		S MON	I	Servo signal monitor input from the SN761056ADBT (IC501) (A/D input)

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