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29

RIPPLE FILTER

ALC

14

13

12

1

2

3

11

10

9

AMP. CH2

AMP. CH1

8

4

5

6

7

VCC

RF

ALC IN2

OUT2

PC2

NF2

IN2

GND

ALC CONST

ALC IN1

OUT1

PC1

NF1

IN1

1

2

3

4

5

6

7

8

9

INVERTER

COMPARATER

SW R1

GND

SW P1 CONT

GND

VCC

SW P2 GND

SW R2

+

–

3

6

9

12

15

2

5

8

11

14

1

4

7

10

13

28

25

22

19

16

29

26

23

20

17

30

27

24

21

18

+

–

+ 
–

+ 
–

LATCH

DECODER

CONTROL

SHIFT

REGISTER

–

+

LVROUT

LVRIN

LTOUT

LTCOM

LT4

LT3

LT2

LT1

L4

L3

L2

L1

VDD

CL

DI

RVROUT

RVRIN

RTOUT

RTCOM

RT4

RT3

RT2

RT1

R4

R3

R2

R1

VREF

VSS

CE

µ

30

16

15

14

AM

RF

AF

BUFFER

AM IF

13

11

10

1

2

3

4

5

FM/AM

FM OSC

FM MIX

AM MIX

9

FM DET

AM DET

AM

OSC

AGC

12

6

7

8

FM IF

FM RF

AM RF

IN

FM RF

OUT

AM/FM

SW

FM OSC

AFC

DET OUT

QUAD

AM OSC

FM RF IN

RF GND

MIX OUT

AGC

VCC

FM IF IN

AM IF IN

GND

AF AMP

COMPARATOR

1

2

3

4

5

6

7

8

9

V. N

C. R.

NF

NC

GND

TROUT

DIOUT

V8

VCC

31

•

µ

Pin No.

Pin Name

I/O

Description

1

GENERALDOUT

O

Serial data output to the FM/AM PLL (U2),  LC75392 (U6) and 94HC4094 (U15)

2

GENERALCLK

O

Serial data transfer clock signal output to the FM/AM PLL (U2),  LC75392 (U6) and 94HC4094 
(U15)

3

I2CDATA

I/O

Two-way data bus with the EEPROM (IC302)

4

STEREO

I

FM stereo detection signal input from the LA1837 (U1)    “L”: stereo

5

I2CCLK

O

Clock signal output to the EEPROM (IC302)

6

IC

—

Internal connection terminal (connected to ground)

7

X2

O

Main system clock output terminal (4.194304 MHz)

8

X1

I

Main system clock input terminal (4.194304 MHz)

9

VDD

—

Power supply terminal

10

XT1

I

Sub system clock input terminal (32.768 kHz)    Not used (open)

11

XT2

O

Sub system clock output terminal (32.768 kHz)    Not used (open)

12

RESET

I

System reset signal input from the reset signal generator (IC304)    “L”: reset
For several hundreds msec. after the power supply rises, “L” is input, then it changes to “H”

13

REMOTE

I

Remote control signal input from the remote control receiver (X302)

14

PWRFAIL

I

Power failure detection signal input terminal    “L”: power failure, “H”: power on

15

RDSCLK

I

Serial data transfer clock signal input from the RDS decoder (IC305)    Not used

16

CDCLK

I

Serial data transfer clock signal input from the CD block

17

SENSORB

I

Tape sensor input terminal    Not used (open)

18

SENSORA

I

Tape play/rec detect sensor input terminal    “L” input when the tape play/rec detect

19

CD DOOR SW

I

CD lid open/close detect switch (SW300) input terminal    “L”: CD lid is closed

20 to 23

CDIN2 to CDIN5

I

Not used (open)

24

AMS

I

Whether a music is present or not from BA335 (U14) is detected at auto music sensor
“L”: music is not present,  “H”: music is present

25

ENCODERA

I

Jog dial pulse input from the rotary encoder (X303 VOLUME) (A phase input)

26

ENCODERB

I

Jog dial pulse input from the rotary encoder (X303 VOLUME) (B phase input)

27

AVSS

—

Ground terminal

28

KEY1

I

Key input terminal (A/D input)    SW301 to SW305 (I/1, TUNER, TAPE, CD, PLAY MODE 
RDS/DIR) keys input    (RDS: used for the AEP, UK models)

29

KEY2

I

Key input terminal (A/D input)
SW306 to SW309 (x, X, Y, TUNER MEM ENTER) keys input

30

KEY3

I

Key input terminal (A/D input)    SW310 to SW312 (PRESET +/–, DISPLAY) keys input

31

KEY4

I

Key input terminal (A/D input)
SW313 to SW315 (TUNING – . m, TUNING + M >, MUSIC MENU) keys input

32

KEY5

I

Key input terminal (A/D input)    SW316, SW317 (MEGA BASS, z) keys input

33

ANALYZER

I

Analyzer level detection signal input terminal (A/D input)    Not used (open)

34

TUNED

I

Tuning detection signal input from the LA1837 (U1) (A/D input)    “L”: tuned

35

RDSDATA

I

Serial data input from the RDS decoder (IC305)    Not used

36

AVDD

—

Power supply terminal

37

AVREF

I

Reference voltage input terminal

38, 39

CDOUT1, CDOUT2

O

Not used (open)

40

VSS

—

Ground terminal

41

CDOUT3

O

Not used (open)

42

CDDATA

I/O

Two-way data bus with the CD block

43

CDRESET

O

Reset signal output to the CD block    “L”: reset

32

Pin No.

Pin Name

I/O

Description

44

STROBE

O

Strobe signal output to the 94HC4094 (U15)    “H” active

45

INPINENA

O

Mega bass on/off selection signal output    “H”: mega bass on

46

DOLBYENA

O

Dolby NR on/off selection signal output terminal    “L”: dolby off,  “H”: dolby on
Not used (open)

47

CE

O

Chip enable signal output to the LC75392 (U6)    “H” active

48

PLLENA

O

PLL chip enable signal output to the FM/AM PLL (U2)    “H” active

49

MUTE

O

Audio line muting on/off control signal output    “H”: muting on

50

POWER

O

System power on/off control signal output    “H”: power on

51 to 54

COM0 to COM3

O

Common drive signal output to the liquid crystal display (CN301)

55

BIAS

O

Bias output for the liquid crystal display drive

56 to 58

VLC0 to VLC2

I

Input terminal for doubler circuit capacitor connection to develop liquid crystal display drive 
voltage

59

VSS

—

Ground terminal

60 to 89

SEG0 to SEG29

O

Segment drive signal output to the liquid crystal display (CN301)

90

SEG30 (SEL6)

I/O

Segment drive signal output to the liquid crystal display (CN301)
AM frequency select switch (SW1) input terminal

91

SEG31 (SEL7)

I/O

Segment drive signal output to the liquid crystal display (CN301)
AM frequency select switch (SW1) input terminal

92

SEG32

O

Segment drive signal output to the liquid crystal display (CN301)

93

SEG33

O

Segment drive signal output to the liquid crystal display    Not used (open)

94

SEL10

I

Head position detect switch input terminal    “L”: reverse direction,  “H”: forward direction

95

SEG35

O

Segment drive signal output to the liquid crystal display    Not used (open)

96

SEL12

I

Cassette tape detect switch input terminal    “L”: no cassette,  “H”: cassette in

97

SEG37

O

Segment drive signal output to the liquid crystal display    Not used

98

SEL14

I

Rec-proof claw (forward direction) detection signal input from the protect detect switch
“L”: recording possible,  “H”: protect

99

SEL15

I

Rec-proof claw (reverse direction) detection signal input from the protect detect switch
“L”: recording possible,  “H”: protect

100

GENERALDIN

I

Serial data input from the FM/AM PLL (U2)