Sony HCD-E301, Service Manual

23

HCD-E301

6-11.

IC  PIN  FUNCTION  DESCRIPTION

•

 DISPLAY BOARD  IC601  

µ

PD753016AGC-F31-3B9 (SYSTEM CONTROLLER, LIQUID CRYSTAL DISPLAY DRIVER)

Pin No.

Pin Name

I/O

Description

1 to 20

S12 to S31

O

Segment drive signal output to the liquid crystal display (D621)

21 to 24

COM0 to COM3

O

Common drive signal output to the liquid crystal display (D621)

25

BIAS

O

Bias output for the liquid crystal display drive

26 to 28

VLC0 to VLC2

I

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

29

TUNER

O

Power on/off control signal output for the tuner section    “L”: power on

30

TAPE

O

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

31

CD

O

Power on/off control signal output for the CD section    “L”: power on

32

TIMER STATUS

O

LED drive signal output of the TIMER indicator (D619)    “L”: LED on

33

VSS

—

Ground terminal

34

CD-RESET

O

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

35

SURROUND

O

Not used (pull up)

36

PLL CL

O

PLL serial data transfer clock signal output to the FM/AM PLL (IC102)

37

PLL DI

O

PLL serial data output to the FM/AM PLL (IC102)

38

TUNER SD

I

FM and AM signal meter voltage detection input from the LA1823 (IC101)

39

CLOCK

O

Serial data transfer clock signal output to the LC75392 (IC203)

40

DATA

O

Serial data output to the LC75392 (IC203)

41

STEREO

I

FM stereo detection signal input from the LA1823 (IC101)    “L”: stereo

42

CD CLOCK

I

Serial data transfer clock signal input from the CD section

43

RDS CLOCK

I

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

44

REMOTE

I

Remote control signal input from the remote control receiver (RM601)

45

SYNCRO

I

Recording on detection signal input

46

MUTE

O

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

47

PLLCE

O

PLL chip enable signal output to the FM/AM PLL (IC102)    “H” active

48

CE

O

Chip enable signal output to the LC75392 (IC203)    “H” active

49

SHRST

O

Not used (open)

50

RDS DATA

I

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

51

PSW

O

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

52

BASS BOOST

O

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

53

DPSW2/SLEND

I

CD lid open/close detection switch (SW600) input terminal    “L”: CD lid is closed

54

VDD

—

Power supply terminal

55

XT1

I

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

56

XT2

O

Not used (open)

57

IC

—

Internal connection terminal (connected to power supply)

58

X1

I

Main system clock input terminal (6 MHz)

59

X2

O

Main system clock output terminal (6 MHz)

60

PLLDO SELECT

I

PLL serial data input from the FM/AM PLL (IC102)

61

CD DATA

I/O

Two-way data bus with the CD section

62

NC

—

Not used (open)

63

12/24H SELECT

I

Not used (fixed at “H”)

64 to 67

KEY R0 to

KEY R4

I

Key return signal input from the key matrix    “L” input when key pressing

68

CPU RESET

I

System reset signal input from the reset signal generator (IC603)    “L”: reset
For several hundreds msec. after the power supply rises, “L” is input, then it changes to “H”

69 to 80

S0 to S11

O

Segment drive signal output to the liquid crystal display (D621)