Sony XR-4803 service manual Section Diagrams, Pin No, Pin Name, Function

SECTION 6

DIAGRAMS

6-1. IC PIN FUNCTION DESCRIPTION

•MAIN BOARD IC501 ∝PD17707GC-529-3B9 (SYSTEM CONTROLLER)

Pin No.	Pin Name	I/O		Function
1	AMSSEL	I	Setting terminal for the AMS selection fixed at “L”
2	POS3	I
3	POS2	I
			Tape position detect input from tape operation switch on the mechanism block
4	POS0	I
5	POS1	I
6	TAPEON	O	Tape system power supply on/off control signal output terminal				“H”: tape on
7	CM ON	O	Capstan/reel motor (M901) drive signal output terminal		“H”: motor on
8	LM LOD	O	Loading/tape operation motor control signal output to the MM1322XFBE (IC351)
			(For the loading direction and forward side operation)		*1
9	LM EJ	O	Loading/tape operation motor control signal output to the MM1322XFBE (IC351)
			(For the eject direction and reverse side operation) *1
10	TUNON	O	Tuner system power supply on/off control signal output to the BA3918 (IC611)					“H”: tuner on
11	FM ON	O	FM system power supply on/off control signal output to the BA3918 (IC611)					“H”: FM on
12	PW ON	O	Main system power supply on/off control signal output to the BA3918 (IC611)					“H”: power on
13	MUT	O	Line muting control signal output terminal	“H”: line muting on
14	VOLCE	O	Chip enable signal output to the electrical volume (IC331)
15	VOLCKO	O	Serial data transfer clock signal output to the electrical volume			(IC331)
16	VOLSO	O	Serial data output to the electrical volume	(IC331)
17	AMPON	O	Standby control signal output to the power amplifier (IC751)			“L”: standby
18	AMPMUT	O	Muting control signal output to the power amplifier (IC751)			“L”: muting on
19	DX/LO	O	Local/DX selection signal output to the FM/AM tuner unit (TU1)				“L”: DX, “H”: local
20	NCO	O	Not used (open)
21	GND	—	Ground terminal
22	DSTSEL	I	Destination setting terminal (fixed at center voltage)
23	D-BASS	I	D-BASS switch (SW951) input (A/D input)
24	KEYIN1	I	Key input terminal (A/D input)
			6, INTRO 1, REPEAT 2, 3, BL SKIP 6, ATA 5, MTL 4 keys input (LSW921 to LSW927)
			Key input terminal (A/D input)
25	KEYIN0	I	OFF, SOURCE, MODE *, + ) +SEEK AMS, – = 0 SEEK AMS, VOLUME –,
			SEL, VOLUME +, ATT, DSPL, BTM, LCL keys input
			(LSW901 to LSW909, LSW930, LSW911 and LSW912)
26	RC IN0	I	Rotary remote commander shift key A/D input terminal
27	VSM	I	FM and AM (MW/LW) signal meter voltage detection input from the FM/AM tuner unit (TU1)
28	AMIFIN	I	AM (MW/LW) intermediate frequency detection signal input from the FM/AM tuner unit (TU1)
29	FMIFIN	I	FM intermediate frequency detection signal input from the FM/AM tuner unit (TU1)
30	VDD2	—	Power supply terminal (+5V)
31	FM OSC	I	FM local oscillator detection signal input from the FM/AM tuner unit (TU1)
32	AM OSC	I	AM (MW/LW) local oscillator detection signal input from the FM/AM tuner unit (TU1)
33	GND	—	Ground terminal
34	NCO	O	Not used (open)
35	EO1	O	Main charge-pump control signal output terminal
36	TEST0	I	Setting terminal for the test (fixed at “L”)
37	NCO	O	Not used (open)
38	SEKOUT	O	Seek control signal output to the FM/AM tuner unit (TU1)
39	MW SW	O	MW/LW selection signal output to the FM/AM tuner unit (TU1)				“L”: MW, “H”: LW
40	BEEP	O	Beep sound output terminal

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