CMT-EP505, HCD-EP505 - Sony Audio Service Manual (repair manual). Page 34

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Pin No.

Pin Name

I/O

Description

78

VSS

—

Ground terminal

79

X2

O

Main system clock output terminal (4.194304 MHz)

80

X1

I

Main system clock input terminal (4.194304 MHz)

81

VDD

—

Power supply terminal

82

XT1

I

Sub system clock input terminal (32.768 kHz)    Not used

83

XT2

O

Sub system clock output terminal (32.768 kHz)    Not used

84

RESET

I

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

85

REMOTE

I

Remote control signal input from the remote control receiver

86

PWRFAIL

I

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

87

RDSCLK

I

Serial data transfer clock signal input from the RDS decoder
(Used for the AEP, UK models)

88

CDCLK

I

Serial data transfer clock signal input from the CD block

89

SENSORB

I

Tape sensor input terminal    Not used

90

SENSORA

I

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

91

CD DOOR SW

I

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

92

CD-EN

O

CD power on/off control signal output terminal

93

SOL

O

Trigger plunger drive signal output terminal    “H”: trigger plunger on

94

TU-EN

O

Tuner power on/off control signal output terminal

95

MOTOR-ON

O

Motor control signal output terminal

96

AMS

I

Whether a music is present or not from AMS is detected at auto music sensor
“L”: music is not present,  “H”: music is present

97

ENCODERA

I

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

98

ENCODERB

I

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

99

AVSS

—

Ground terminal

100

KEY1

I

Key input terminal (A/D input)