Sony MZ-R900 service manual Focus error signal input from RF amp IC501

MZ-R900

Pin No.	Pin Name	I/O	Description
47	FE	I	Focus error signal input from RF amp (IC501)
48	AUX1	I	Support signal (I3 signal/temperature signal) input terminal (A/D input)
49	VC	I	Middle point voltage (+1.2V) input terminal
50	ADIO	O	Monitor output of A/D converter input signal Not used (open)
51	ADRT	I	A/D converter the upper limit voltage input (fixed at		“H” in this set)
52	AVD2	—	Power supply terminal (for the analog) (+2.4V)
53	AVS2	—	Ground terminal (for the analog)
54	ADRB	I	A/D converter the lower limit voltage input (fixed at		“L” in this set)
55	SE	I	Sled error signal input terminal Not used ( fixed at “L”)
56	TE	I	Tracking error signal input from RF amp (IC501)
57	DCHG	—	Connecting analog power supply of the low impedance (fixed at “H” in this set)
58	APC	I	Error signal input for the laser automatic power control Not used (fixed at “H”)
59	DSPVDD0	—	Power supply terminal (for DSP block) (+1.5V)
60	DSPVSS0	—	Ground terminal (for DSP block)
61	XTSL	I	Input terminal for the frequency set up of the system clock			“L”: 45.1584MHz,
			“H”: 22.5792MHz (fixed at “L” in this set)
62	DIN1	I	Input terminal of the record system digital audio signal
63	DOUT	O	Output terminal of the playback system digital audio signal			Not used (open)
64	DAPWMLP	O	D/A converter PWM output (L-CH right phase)	Not used (open)
65	DAPWMLN	O	D/A converter PWM output (L-CH reverse phase)		Not used (open)
66	DAPWMRP	O	D/A converter PWM output (R-CH right phase)	Not used (open)
67	DADT	O	Audio data output to the external A/D, D/A converter (IC301)
68	ADDT	I	Data signal input from the external A/D, D/A converter (IC301)
69	LRCK	O	L/R sampling block signal (44.1KHz) output to the external A/D, D/A converter (IC301)
70	XBCK	O	Bit clock signal (2.8224MHz) output to the external A/D, D/A converter (IC301)
71	FS256	O	11.2896MHz clock signal output to the external A/D, D/A converter (IC301)
72	MVCI	I	Vibrate input for the digital in PLL from the external VCO			Not used (fixed at “L”)
73	DSPVDD1	—	Power supply terminal (for DSP block) (+1.5V)
74	ADFG	I	ADIP duplex FM signal (20.05± 1KHz) input from RF amp (IC501)
75	F0CNT	O	Filter cut off control signal output Not used
76	DIFVDD0	—	Power supply terminal (for DSP I/F) (+2.3V)
77	DIFVSS0	—	Ground terminal (for DSP I/F)
78	APCREF	O	Control signal output to the reference voltage generation circuit for the laser automatic power
			control
79	LDDR	O	PWM signal output for the laser automatic power control			Not used (open)
80	TRDR	O	Tracking servo drive PWM signal output (–) to the motor driver (IC551)
81	TFDR	O	Tracking servo drive PWM signal output (+) to the motor driver (IC551)
82	FFDR	O	Focus servo drive PWM signal output (+) to the motor driver (IC551)
83	FRDR	O	Focus servo drive PWM signal output (–) to the motor driver (IC551)
84	MCUVDD1	—	Power supply terminal (for the microcomputer block) (+1.5V)
85	FGIN	I	FG signal input terminal for the spindle servo	Not used (open)
86	FS4	O	176.4MHz clock signal output to the power control (IC601, IC901)
87	SPRD/SPDU/	O	Spindle servo drive PWM signal output terminal (–) to the motor driver (IC551)
	RTG0
88	SPFD/SPVS/	O	Spindle servo drive PWM signal output (+)
	PWM3
89	SPDV/RTG1	O	Spindle motor drive control signal output (V)/RTG output 1 to the motor driver (IC551)
90	SPDW/RTG2	O	Spindle motor drive control signal output (W)/RTG output 2 to the motor driver (IC551)

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