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25

SCOUT

MRO

MPTH

TCON

OSCO

OSCI

VSSD

VDDD

DAVN

SDA

VREF

MPX

VSSA

VDDA

AFIN

MAD

PSWN

SCL

2

1

6

15

11

13

16

14

12

INTERFACE

REGISTER

SIGNAL QUALITY

DECODER

CLOCKED

COMPARATOR

POWER SUPPLY

& RESET

TEST

CONTROL

OSCILLATOR

& CLOCK

PAUSE

DETECTOR

MULTI

PATH

DETECTOR

57kHz

8th ORDER

BAND-PASS FILTER

RDS/RDBS

DECODER

RDS/RDBS

DEMODULATOR

IIC BUS SLAVE

TRANSCEIVER

17

18

CIN

19

LVIN

20

8

7

DATA

CLOCK

DATA

CLOCK

4

4

5

9

10

3

4

5

+
–

+

–

+

–

+

–

+ –

1

2

3

4

5

6

7

8

9

10

20

19

18

17

16

15

14

13

12

11

21

22

23

26

27

28

29

30

31

32

33

34

37

38

39

40

24

25

PBFB1

PBRIN1

PBREF1

PBFIN1

35

36

PBGND

VCT

PBFIN2

PBREF2

PBRIN2

PBFB2

PBEQ1

PBOUT1

VCC

TAPEIN1

AUXIN1

MSLPF

LINEOUT1

NC

NC

G2FB

G1FB

MSTC

DGND

MSOUT

NC

NC

INSW

TAPESW

MSMODE

DRSW

MSSW

NC

NC

LINEOUT2

DIREF

AUXIN2

TAPEIN2

PBEQ2

PBOUT2

GND

F2

120

µ

/70

µ

X1

X1

VCT

+

F1

120

µ

/70

µ

24dB

F3

LPF

VCC

DETECT

MS ON/

OFF

FWD/RVS

TAPE EQ

TAPE/AUX

NR BIAS

24dB

MS

MODE

T2

T1

26

34

35

36

37

38

39

40

41

42

43

44

33 32 31

30

29

28

27

26

25

24 23

22

21

20

19

18

16

15

14

13

12

1 2

3 4 5 6

7 8 9 10

11

INPUT

MULTIPLEXER

MAIN SOURCE

SELECTOR

MIXING

SELECTOR

SECOND SOURCE

SELECTOR

MAIN

PHONO

MAIN

CH0

AUX

AM

FM

IN-GAIN

+AUTO ZERO

+

LOUDNESS

SOFTMUTE

VOLUME

TREBLE

BASS

HP

LP

COMPANDER

VOICE

BANDPASS

MUTE

IN-GAIN

LOUDNESS

DIGITAL CONTROL

IIC-BUS

HIGH-CUT

S&H

25kHz

LP

DEMODULATOR

+STEREO ADJUST

+STEREO BLAND

MULTIPATH

DETECTOR

D/A

CONVERTER

PILOT

CANCELATION

PIL DET

PLL

AM/FM

NOISE BLANKER

BEEP

80kHz

LP

17

PULSE

FORMER

QUAL

SUPPLY

SECOND

MAIN

ACIN

MONO-

FADER

MONO-

FADER

MONO-

FADER

MONO-

FADER

MONO-

FADER

MONO-

FADER

SUBWOOFER

+PHASE

CONTROL

MIXER

OUTPUT

SELECTOR

FRONT

REAR

SW

VDD

SCL

SDA

GND

SM

QUAL

MPOUT

MPIN

LEVEL

MPX

AMIF

SEL

SER

FD1L+

FD1L

–

FD1R+

FD1R

–

FD2L+

FD2L

–

FD2R+

FD2R

–

AM

ACINLF

SWINR

SWINL

ACOUTR

ACOUTL

CREF

MUX

MD1

MD1G

MD2

MD2G

ACINLR

ACINRF

ACINRR

OUTLF

OUTLR

OUTRF

OUTRR

OUTSWL

OUTSWR

OUTSSL

OUTSSR

27

1
2

3

4

5

6

7

8

9

10

VCC

IN2

S-GND

IN1

NC

NC

OUT2

NC

P-GND

OUT1

CONTROL

CIRCUIT

MOTOR

DRIVE

CIRCUIT

BUFFER

BUFFER

+

–

+

–

+

–

+

–

OVER VOLTAGE

PROTECT

REGULATOR

1

2 3 4

5

6

7

8

9

10

12

11

NC

TUNER8.7 ANT SW

TUNER5.6 SW

STB

VDD5.6V

AMP

VCC

ANT

COM8.7V

TUNER5.6V

TUNER8.7V

GND

RESET

SWITCH

BATT

SWITCH

1

2

3

4

5

6

7

8

9

10

14

13

12

11

BUS ON

OUT

RESET

OUT

BATT

CLK

OUT

VREF

DATA

IN/OUT

GND

BATT
CHECK

CLK
IN

BUS ON
IN

RESET
IN

VCC

DATA IN

DATA OUT

28

•

Pin No.

Pin Name

I/O

Description

1

TU-ON

O

Tuner system power supply on/off control signal output to the BA4908 (IC671)
“H”: tuner power on

2

ANT CUT

O

Tuner system power supply on/off control signal output terminal    “H”: tuner power on
Not used (open)

3

BUS-ON

O

Bus on/off control signal output to the SONY bus interface (IC701)    “L”: bus on 
Used for the XR-C5300RV,not used (open) for the XR-4300RV

4 to 6

NCO

O

Not used (open)

7

ILL-ON

O

Power on/off control signal output of the illumination LED and liquid crystal display driver 
(IC901)    “H”: power on

8

VCC

—

Power supply terminal (+5V)

9

E2P SIO

I/O

Two-way data bus with the FM/AM tuner unit (TU1)

10

E2P CKO

I/O

Two-way data bus with the FM/AM tuner unit (TU1)

11

SYSRST

O

Reset signal output to the SONY bus interface (IC701)    “L”: reset
Used for the XR-C5300RV,not used (open) for the XR-4300RV

12

DOORSW

I

Front panel open/close detection signal input    “L” is input when the front panel is closed

13

LCD SO

O

Serial data output to the liquid crystal display driver (IC901)

14

LCD CKO

O

Serial data transfer clock signal output to the liquid crystal display driver (IC901)

15

LCD CE

O

Chip enable signal output to the liquid crystal display driver (IC901)    “H” active

16

BEEP

O

Beep sound drive signal output terminal

17

UNISI

I

Serial data input from the SONY bus interface (IC701)
Used for the XR-C5300RV,not used (fixed at “L”) for the XR-4300RV

18

UNISO

O

Serial data output to the SONY bus interface (IC701)
Used for the XR-C5300RV,not used (fixed at “L”) for the XR-4300RV

19

UNICKO

O

Serial data transfer clock signal output to the SONY bus interface (IC701) 
Used for the XR-C5300RV,not used (fixed at “L”) for the XR-4300RV

20

UNICKI

I

Serial data transfer clock signal input from the SONY bus interface (IC701) 
Used for the XR-C5300RV,not used (fixed at “L”) for the XR-4300RV

21

CD/MD

I

CD/MD selection signal input terminal    Not used (fixed at “L” in this set)

22

FLASH-W

I

Internal flash memory data write mode detection signal input terminal    “L”: data write mode
Not used (fixed at “H” in this set)

23

NCO

O

Not used (open)

24

SIRCS

I

Sircs remote control signal input form the remote control receiver (IC951)

25 to 28

NCO

O

Not used (open)

29

DOOR-IND

O

LED drive signal output of the door indicator (LED801)    “H”: LED on
“H” is output to turn on LED when front panel is opened

30

IFWIDTH

I

IF band detection signal input terminal    Not used (open)

31

NCO

O

Not used (open)

32

NS MASK

O

Discharge control signal output for the noise detection circuit    “H”: discharge

33

VSS

—

Ground terminal

34

C

—

Connected to coupling capacitor for the power supply

35

AD-ON

O

A/D converter power control signal output terminal
When the KEYACK (pin uh) that controls reference voltage power for key A/D conversion input 
is active, “L” is output from this terminal to enable the input

36

RE-IN0

I

37

RE-IN1

I

38

DVCC

—

Power supply terminal (+5V) (for D/A converter)

39

DVSS

—

Ground terminal (for D/A converter)

Dial pulse input of the rotary encoder (RE901)
 (for VOLUME/BASS/TREBLE/BALANCE/FADER control)