Sony MZ-R91 service manual

Pin No.	Pin Name		I/O		Description
46	FS256		O	Clock signal (11.2896 MHz) output to the A/D, D/A converter (IC301) (X' tal system)
47 to 52	A03, A04, A02,		O	Address signal output to the external D-RAM		Not used (open)
	A05, A01, A06
53	VDIO1		—	Power supply terminal (+2.4V) (for I/O)
54	VSIO1		—	Ground terminal (for I/O)
55 to 59	A00, A07, A10.		O	Address signal output to the external D-RAM		Not used (open)
	A08, A09
60	XRAS		O	Row address strobe signal output to the external D-RAM			“L” active		Not used (open)
61	IXOE		O	Output enable signal output terminal for internal D-RAM			“L” active		Not used (open)
62	IXWE		O	Data write enable signal output terminal for internal D-RAM				“L” active		Not used (open)
63	XCAS		O	Column address strobe signal output to the external D-RAM				“L” active		Not used (open)
64 to 67	D1, D2, D0, D3		I/O	Two-way data bus with the external D-RAM		Not used (open)
68	VDC3		—	Power supply terminal (+1.8V) (for internal logic)
69	VSC3		—	Ground terminal (for internal logic)
70		A11	O	Address signal output to the external D-RAM		Not used (open)
71	XOE		O	Output enable signal output to the external D-RAM “L” active Not used (open)
72	XWE		O	Data write enable signal output to the external D-RAM			“L” active		Not used (open)
73	MVCI		I (S)	Digital in PLL oscillation input from the external VCO			Not used (fixed at “L”)
74	ASYO		O (A)	Playback EFM full-swing output terminal
75	ASYI		I (A)	Playback EFM asymmetry comparator voltage input terminal
76	AVD1		—	Power supply terminal (+2.4V) (analog system)
77	BIAS		I (A)	Playback EFM asymmetry circuit constant current input terminal
78		RFI	I (A)	Playback EFM RF signal input from the SN761056ADBT (IC501)
79	AVS1		—	Ground terminal (analog system)
80	PCO		O (3)	Phase comparison output for master clock of the recording/playback EFM master PLL
81	FILI		I (A)	Filter input for master clock of the recording/playback EFM master PLL
82	FILO		O (A)	Filter output for master clock of the recording/playback EFM master PLL
83	CLTV		I (A)	Internal VCO control voltage input of the recording/playback EFM master PLL
84	PEAK		I (A)	Light amount signal (RF/ABCD) peak hold input from the SN761056ADBT (IC501)
85	BOTM		I (A)	Light amount signal (RF/ABCD) bottom hold input from the SN761056ADBT (IC501)
86	ABCD		I (A)	Light amount signal (ABCD) input from the SN761056ADBT (IC501)
87		FE	I (A)	Focus error signal input from the SN761056ADBT (IC501)
88	AUX1		I (A)	Auxiliary signal (I3 signal/temperature signal) input terminal				Not used (fixed at “H”)
89		VC	I (A)	Middle point voltage (+1.2V) input terminal
90	ADIO		O (A)	Monitor output of the A/D converter input signal Not used (open)
91	ADRT		I (A)	A/D converter operational range upper limit voltage input terminal (fixed at “H” in this set)
92	AVD2		—	Power supply terminal (+2.4V) (analog system)
93	AVS2		—	Ground terminal (analog system)
94	ADRB		I (A)	A/D converter operational range lower limit voltage input terminal (fixed at “L” in this set)
95		SE	I (A)	Sled error signal input terminal Not used (fixed at “L”)
96		TE	I (A)	Tracking error signal input from the SN761056ADBT (IC501)
97	DCHG		I (A)	Connected to the +2.4V power supply
98	APC		I (A)	Error signal input for the laser automatic power control			Not used (fixed at “H”)
99	ADFG		I (A)	ADIP duplex FM signal (22.05 kHz ±	1 kHz) input from the SN761056ADBT (IC501)
100	VDIO2		—	Power supply terminal (+2.4V) (for I/O)
101	VSIO2		—	Ground terminal (for I/O)
102	F0CNT		O	Filter f0 control signal output terminal	Not used (open)

* I (S) stands for schmitt input, I (A) for analog input, O (3) for 3-state output, and O (A) for analog output in the column I/O

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