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

6-9. IC PIN DESCRIPTIONS

• MAIN BOARD IC501 SN761056ADBT (RF AMP, FOCUS/TRACKING ERROR AMP)

Pin No.	Pin Name		I/O	Pin Description
1		TE	O	Tracking error signal output to the CXD2660GA (IC502)
2		REXT	—	Connected to the external resistor for the ADIP amplifier control
3	WPPLPF		—	Connected to the external capacitor for low-pass filter of the TPP/WPP
4	VREF11		O	Reference voltage output terminal (+1.1 V)
5		C	I	Signal input from the optical pick-up detector (C)
6		D	I	Signal input from the optical pick-up detector (D)
7		D-C	I	Signal input from the optical pick-up detector (D) (AC input)
8		IY	I	I-V converted RF signal IY input from the optical pick-up block detector
9		IX	I	I-V converted RF signal IX input from the optical pick-up block detector
10		JX	I	I-V converted RF signal JX input from the optical pick-up block detector
11		JY	I	I-V converted RF signal JY input from the optical pick-up block detector
12		A	I	Signal input from the optical pick-up detector (A)
13		A-C	I	Signal input from the optical pick-up detector (A) (AC input)
14		B	I	Signal input from the optical pick-up detector (B)
15	TON-C		—	Connected to the external capacitor for the TON hold
16		CIG	—	Connected to the external capacitor for low-pass filter of the NPP divider denominator
17		CDN	—	Connected to the external capacitor for low-pass filter of the CSL divider denominator
18		PD-NI	I	Light amount monitor input terminal (non-invert input)
19		PD-I	I	Light amount monitor input terminal (invert input)
20		PD-O	O	Light amount monitor output terminal
21		ADFG	O	ADIP duplex FM signal (22.05 kHz ± 1 kHz) output to the CXD2660GA (IC502)
22	DVDD		—	Power supply terminal (+2.4 V) (digital system)
23		SBUS	I/O	Two-way SSB serial data bus with the system controller (IC801)
24		SCK	I	SSB serial clock signal input from the system controller (IC801)
25			I	Reset signal input from the system controller (IC801) “L”: reset
		XRST
26	OFTRK		I	Off track signal input from the CXD2660GA (IC502)
27	DGND		—	Ground terminal (digital system)
28	BOTM		O	Light amount signal (RF/ABCD) bottom hold output to the CXD2660GA (IC502)
29		PEAK	O	Light amount signal (RF/ABCD) peak hold output to the CXD2660GA (IC502)
30	VREF075		—	Connected to the external capacitor for the internal reference voltage
31		VC	O	Middle point voltage (+1.2 V) generation output terminal
32	CCSL2		—	Connected to the external capacitor for low-pass filter of the TPP/WPP
33	RF OUT		O	Playback EFM RF signal output to the CXD2660GA (IC502)
34	AGND		—	Ground terminal (analog system)
35		EQ	—	Connected to the external capacitor for the RF equalizer
36		LP	—	Connected to the external capacitor for the RF equalizer
37		PS	—	Connected to the external capacitor for the RF equalizer
38	OFC-2		—	Connected to the external capacitor for the RF AC coupling
39	OFC-1		—	Connected to the external capacitor for the RF AC coupling
40		AVCC	—	Power supply terminal (+2.4 V) (analog system)
41	ABCD		O	Light amount signal (ABCD) output to the CXD2660GA (IC502)
42		FE	O	Focus error signal output to the CXD2660GA (IC502)
43	S-MON		O	Servo signal monitor output to the system controller (IC801)
44	ADIP-IN		I	ADIP duplex FM signal (22.05 kHz ± 1 kHz) input terminal Not used

– 44 –