Sony MZ-R90/R91, MT-MZR70-165 service manual

• MAIN BOARD IC801 CXR701080-010GA (SYSTEM CONTROLLER)

Pin No.	Pin Name		I/O	Pin Description
1	SYNC REC		I	SYNCHRO REC switch (S801) input terminal	“L”: off, “H”: on
2		OFTRK	I	Off track signal input from the CXD2660GA (IC502)
3	PROTECT		I	Rec-proof claw detect input from the protect detect switch (S806)
				“L”: recording possible, “H”: protect
4	PAUSE KEY		I	Set pause key input terminal
5		TX	O	Recording data output enable signal output to the CXD2660GA (IC502)
				Writing data transmission timing output
6		SENSE	I	Internal status (SENSE) input from the CXD2660GA (IC502)
7		WRPWR	O	Laser power select signal output to the CXD2660GA (IC502)
				“L”: playback mode, “H”: recording mode
8		XLAT	O	Serial data latch pulse output to the CXD2660GA (IC502)
9		XCS DSP	O	Chip select signal output to the CXD2660GA (IC502)
10		CS RTC	O	Not used (open)
11		SI0	I	Serial data input from the A/D, D/A converter (IC301), CXD2660GA (IC502), EEPROM
				(IC802) and switch & liquid crystal display module unit
12		SO0	O	Serial data output to the A/D, D/A converter (IC301), CXD2660GA (IC502), EEPROM
				(IC802) and switch & liquid crystal display module unit
13		SCK0	O	Serial clock signal output to the A/D, D/A converter (IC301), CXD2660GA (IC502),
				EEPROM (IC802) and switch & liquid crystal display module unit
14	XGUM ON		I	Not used (open)
15		VSS	—	Ground terminal
16		VDD	—	Power supply terminal (+2.4 V)
17		XOUT	O	Not used (open)
18		BEEP	O	Beep sound control signal input terminal
19	RMC DTCK		I/O	TSB serial communication data input/output terminal for remote commander with headphone
20	XCS LCD		O	Chip select signal output to the liquid crystal display
21		LCD STB	O	Strobe signal output to the liquid crystal display
22			O	Reset control signal output to the liquid crystal display
		LCD RST
23	XHP STBY		O	Standby on/off control signal output to the line/headphone amplifier (IC303)
				“L”: standby mode, “H”: amplifier on
24		CLV U	O	Spindle servo (U) drive signal input from the MPC17A56FTA (IC601)
25		CLV V	O	Spindle servo (V) drive signal input from the MPC17A56FTA (IC601)
26		CLV W	O	Spindle servo (W) drive signal input from the MPC17A56FTA (IC601)
27		MODE1	O	Power supply control signal output for over write head drive to the MPC18A21MTB (IC603)
28		MODE2	O	Power supply control signal output for over write head drive to the MPC18A21MTB (IC603)
29		MODE3	O	Power supply control signal output for over write head drive to the MPC18A21MTB (IC603)
30	HD CON 1		O	Over write head control signal output to the MPC18A21MTB (IC603)
31	HD CON 2		O	Over write head control signal output to the MPC18A21MTB (IC603)
32	XREC MODE		O	Not used (open)
33		LD ON	O	Laser diode on/off control signal output terminal	“L”: laser off, “H”: laser on Not used (open)
34	TSB SLV ON		I	TSB slave detect signal input terminal
35	SLD MON 1		I	Sled servo timing signal input from the MPC17A56FT (IC601)
36		PD S0	O	PD IC mode switching signal output to the optical pick-up block
37	REG CTL CLK		O	Synchronizing external clock signal output terminal Not used (open)
38		PD S1	O	PD IC mode switching signal output to the optical pick-up block
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

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