HCD-GV10AV - Sony Audio Service Manual (repair manual). Page 70

70

Pin No.

Pin Name

I/O

Description

42

GR-2

O

Grid drive signal output to the fluorescent indicator tube (FL601)

43

GR-1

O

Grid drive signal output to the fluorescent indicator tube (FL601)

44 to 66 SEG-1 to SEG-23

O

Segment drive signal output to the fluorescent indicator tube (FL601)

67

LED STANDBY

O

LED drive signal output of the I/1 indicator (D601)    “H”: LED on

68

VKK

—

Power supply terminal (–35V) (for fluorescent indicator tube drive)

69

VDD

—

Power supply terminal (+5V)

70

XIN

I

System clock input terminal (12.5 MHz)

71

VSS

—

Ground terminal

72

XOUT

O

System clock output terminal (12.5 MHz)

73

RESET

I

System reset signal input from the reset signal generator (IC801)    “L”: reset
For several hundreds msec. after the power supply rises, “L” is input, then it changes to “H”

74

JOG A

I

Jog dial pulse input from the rotary encoder (S763 JOG DIAL) (A phase input)

75

JOG B

I

Jog dial pulse input from the rotary encoder (S763 JOG DIAL) (B phase input)

76

TEST

I

Connected to ground

77

—

—

Not used (open)

78

I2C DATA

I/O

Communication data bus with the system controller (IC501) and CD mechanism controller 
(IC502)

79

I2C CLK

I/O

 

Communication data reading clock signal input or transfer clock signal output with the system
controller (IC501) and CD mechanism controller (IC502)

80

D-SW

I

CD door open/close detection switch (S742) input terminal    “L”: close, “H”: open