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– 51 –

PHASE

DET

PRESCALER

MAIN

COUNT

IF COUNT

CTL

20BIT COUNT

SHIFT REGISTER LATCH

REFERENCE

DIVIDER

I/O

CTL

1

2

4

5

6

7

9

10

20

18

17

16

15

14

13

12
11

19

XIN

CE

CK

DA

CD

P0

P1

P3

XOUT

VSS

PD

VDD

FMIN

AMIN

P2

IFIN

SD
P4

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

GND

IN1

VCC

IN2

GND

N.C.

OUT2

VS

OUT1

N.C.

CONTROL LOGIC

– 52 –

+
–

+

–

+

–

+

–

+ –

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

PBFB2

PBRIN2

PBREF2

PBFIN2

35

36

PBGND

VCT

PBFIN1

PBREF1

PBRIN1

PBFB1

PBEQ2

PBOUT2

VCC

TAPEIN2

AUXIN2

MSLPF

LINEOUT2

TCH2

NC

PLAY

FF

MSTC

DGND

MSOUT

NC

NRSW

INSW

TAPESW

MSMODE

DRSW

MSSW

NC

TCH1

LINEOUT1

DIREF

AUXIN1

TAPEIN1

PBEQ1

PBOUT1

GND

F2

120

µ

/

70

µ

X1

X1

VCT

+

F1

120

µ

/

70

µ

NR

OFF/B

F3

LPF

VCC

DETECT

MS ON/

OFF

NR

MODE

FWD/RVS

TAPE EQ

TAPE/AUX

NR BIAS

NR

MS

MODE

OFF/B

T2

T1

37

GAIN12

38

GAIN11

39

IN14

40

IN13

41

IN12

42

IN11

INPUT SW

36

GAIN134

LOUD

VOLUME

8dB STEP

VOLUME

1dB STEP

TONE

FADER

35

LDLC1

34

LDHC1

33

INAO1

32

VRIN1

31

VOUT1

30

TIN1

29

TCLC1

28

TCLC11

27

TCLC12

26

TCO1

25

FDIN1

24 FNTO1

23 REO1

VCTBUFF

VCTBUFF

VCTBUFF

LATCH

CONTROL

LATCH

1

GAIN234

LOUD

VOLUME

8dB STEP

VOLUME

1dB STEP

TONE

FADER

2

LDLC2

3

LDHC2

4

INAO2

5

VRIN2

6

VOUT2

7

TIN2

8

TCLC2

9

TCLC21

10

TCLC22

11

TCO2

12

FDIN2

14 REO2

13 FNTO2

VCTBUFF

VCTBUFF

VCTBUFF

SHIFT

REGISTER

ZCDET

43

IN21

44

IN22

45

IN23

46

IN24

47

GAIN21

48

GAIN22

INPUT SW

18 VCC

17 VCT

16 DATA

15 TIMER

22 CE

21 CLK

20 DGND

19 GND

45k

45k

– 53 –

+

–

+

–

+

–

+

–

OVER VOLTAGE

PROTECT

REGULATOR

1

2 3 4

5

6

7

8

9

10

12

11

NC

MODE2

MODE1

STB

VDD

AMP

VCC

ANT

COM

AM

FM

GND

1

2

3

4
5

6

7

8

9

10

14

13

12

11

BUS ON

SWITCH

RESET

SWITCH

BATTERY

SWITCH

BUS ON

RST

BATT

CLK

VREF

DATA

GND

VCC

RST
BUS ON

CLK IN

BU IN

DATA IN

DATA OUT

– 54 –

•

Pin No.

Pin Name

I/O

Function

1

SEEKOUT

O

Seek control signal output to the FM/AM tuner unit (TUX10)
AM mode: Used for IF count output/SD output request/AGC cut at SEEK or BTM
FM mode: Used for SD speed up at SEEK, BTM, or AF
“L” is output at tuner off

2

AF-SEEK

O

PLL low-pass filter time constant selection signal output at AF SEEK
“H” is output when AF SEEK

3

WIDE

O

4

ST-MONO

I/O

FM stereo broadcasting detection signal input from the FM/AM tuner unit (TUX10), or forced 
monaural control signal output to the FM/AM tuner unit (TUX10)
“L” is input in the FM stereo mode, or “L” is output in the forced monaural mode

5

TUNMUTE

O

Muting on/off control signal output of the FM and AM tuner signal    “H”: muting on

6

FM-ON

O

FM system power supply on/off control signal output to the BA3918 (IC502)
“L”: AM power on, “H”: FM power on

7

TU-ON

O

Tuner system power supply on/off control signal output to the BA3918 (IC502)
“H”: tuner power on

8

VCC

—

Power supply terminal (+5V)

9

CSV-RST

O

Reset signal output to the CSV     “L”: reset    Not used (open)

10

BUS-ON

O

Bus on/off control signal output to the SONY bus interface (IC602)    “L”: bus on

11

SYSRST

O

Reset signal output to the SONY bus interface (IC602)    “L”: reset

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 (IC900)

14

LCD CKO

O

Serial data transfer clock signal output to the liquid crystal display driver (IC900)

15

BEEP

O

Beep sound drive signal output terminal

16

LCD CE

O

Chip enable signal output to the liquid crystal display driver (IC900)    “H” active

17

UNISI

I

Serial data input from the SONY bus interface (IC602)

18

UNISO

O

Serial data output to the SONY bus interface (IC602)

19

UNICKO

O

Serial data transfer clock signal output to the SONY bus interface (IC602)

20

SD-IN

I

Station detector detect input from the FM/AM tuner unit (TUX10)
Stop level for SEEK, BTM, etc. is determined    SD is present at input of “H”

21

CSV-SO

O

Serial data output to the CSV    Not used (open)

22

CSV-CKO

O

Serial data transfer clock signal output to the CSV    Not used (open)

23

CSV-CE

O

Chip enable signal output to the CSV    “L” active    Not used (open)

24

SIRCS

I

Sircs remote control signal input from the remote control receiver (IC901)

25

PLLSI

I

PLL serial data input from the FM/AM PLL (IC10)

26

PLLSO

O

PLL serial data output to the FM/AM PLL (IC10)

27

PLLCKO

O

PLL serial data transfer clock signal output to the FM/AM PLL (IC10)

28

PLLCE

O

PLL chip enable signal output to the FM/AM PLL (IC10)    “H” active

29

ILL-ON

O

30

DIMMER

I/O

Dimmer control in/out terminal
At initial mode: The presence of dimmer select function is set (if this status, if “L” is input, the 
dimmer select function is present)
At normal mode: LCD back light brightness control signal output

31

TIR-IND

O

LED drive signal output of the TIR indicator    “H”: LED on    Not used

Power on/off control signal output of the illumination LED and liquid crystal display driver 
(IC900)    “H”: power on    Depends on initial setting of power select switch (S600)
Power select switch (S600) on: “H” output at the accessory on
Power select switch (S600) off: “H” output at the power on

IF band select signal output to the FM/AM tuner unit (TUX10)    “H”: wide mode
In receiving FM signals, interference noise from adjacent stations is removed by narrowing the 
IF band automatically in the tuner unit so as to raise the selectivity, but in this case, the distortion 
may increase and accordingly, the IF band is widened forcibly