SRF-HM01V - Sony Audio Service Manual (repair manual). Page 19

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Pin No.

Pin Name

I/O

Description

1 to 4

COM1 to COM4

O

Common drive signal output to the liquid crystal display

5 to 15

S1 to S11

O

Segment drive signal output to the liquid crystal display

16

P8-1

I

Not used

17

TR TEST

I

Setting terminal for TR mode (fixed at  “L” in this set)

18

P8-3

I

Not used

19, 20

P9-0, P9-1

I

Not used

21, 22

KS1, KS2

O

Key scan signal output to the key matrix

23 to 25

KR1 to KR3

I

Key return signal input from the key matrix

26

P1-3

I

Not used

27

VDD

—

Power supply terminal (+1.5V)

28

BEEP

O

Beep sound signal output     “H”: beep sound on

29

MEGA BASS

O

Mega bass control signal output     “H”: mega bass on

30

AM BAND

O

AM band selection signal output    “H”: AM

31

MUTE

O

Muting control signal output    “L”: muting on

32

MUTE

O

Muting control signal output    Not used

33

TEST

I

Setting terminal for test mode    Not used

34

POWER SW

I

POWER switch input    “H”: power on

35

INT1

I

Battery voltage (1.0V) detection signal input     “L”: low battery

36

IF IN2

I

Not used

37

GND

—

Ground terminal

38

OSC IN

I

FM/AM/TV/WEATHER OSC signal input from the tuner circuit

39

VDD

—

Power supply terminal (+1.5V)

40

D0

O

PLL phase comparator output

41

V REG

—

Power supply terminal (connected to the coupling capacitor)

42

POWER ON2

O

Power on/off signal output    “L”: power on

43

FM BAND

O

FM band selection signal output     “L”: FM/TV (2ch to 6ch) (fixed at  “L” in this set)

44, 45

P3-2, P3-3

I

Not used

46

REF SW

I

TV reference frequency selection signal output    “L”: 3.125kHz, “H”: 6.25kHz                               
(fixed at  “L” in this set)

47 to 49

P5-1 to P5-3

I

Not used

50

MONO/ST

O

Mono/stereo selection signal output    “L”: mono

51

POWER ON1

O

Power on/off control signal output to the audio master amp    “H”: power on

52

BAND1

O

Band 1 selection signal output    “L”: AM, “H”: FM/TV/WEATHER

53

BAND2

O

Band 2 selection signal output                                                                                                              
“L”: FM/TV (2ch to 6ch), “H”: AM/TV (7ch to 13ch)/WEATHER

54

RESET

I

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

55

XOUT

O

Main system clock output terminal (75 kHz)

56

XIN

I

Main system clock input terminal (75 kHz)

57

GND

—

Ground terminal

58

VDB

—

Connection terminal of doubler circuit capacitor for liquid crystal display drive power supply

59, 60

C1, C2

—

Connection terminal of doubler circuit capacitor for liquid crystal display drive power supply

61

VEE

—

Connection terminal of doubler circuit capacitor for liquid crystal display drive power supply

62, 63

C3, C4

—

Connection terminal of doubler circuit capacitor for liquid crystal display drive power supply

64

VCLD

—

Connection terminal of doubler circuit capacitor for liquid crystal display drive power supply