ICF-CD873L - Sony Audio Service Manual (repair manual). Page 24

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Pin No.

Pin Name

I/O

Description

57

IC

—

Internal connection terminal (connected to power supply)

58

X1

I

Main system clock input terminal (4.194 MHz)

59

X2

O

Main system clock output terminal (4.194 MHz)

60

SHIFT CK

O

Shift clock output of the main system clock (4.194 MHz)    “H” active

61

COLOR

O

LCD back light color selection signal output terminal    “L”: amber, “H”: green

62

DOOR-IN

I

CD lid open/close detection switch (S424) input terminal    “L”: CD lid is closed

63 to 67

KEYRET0 to

KEYRET4

I

Key return signal input from the key matrix

68

RESET

I

System reset signal input from the reset signal generator (IC402)    “L”: reset
For several hundreds msec. after the power supply rises, “L” is input, then it changes to “H”

69

SEG0

O

Segment drive signal output terminal    Not used (open)

70 to 80

SEG1 to SEG11

O

Segment drive signal output to the liquid crystal display (LCD401)