CMT-EP50LIV, HCD-EP50LIV - Sony Audio Service Manual (repair manual). Page 31

31

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Pin No.

Pin Name

I/O

Description

1

GENERALDOUT

O

Serial data output to the FM/AM PLL (U2),  LC75392 (U6) and 94HC4094 (U15)

2

GENERALCLK

O

Serial data transfer clock signal output to the FM/AM PLL (U2),  LC75392 (U6) and 94HC4094 
(U15)

3

I2CDATA

I/O

Two-way data bus with the EEPROM (IC302)

4

STEREO

I

FM stereo detection signal input from the LA1837 (U1)    “L”: stereo

5

I2CCLK

O

Clock signal output to the EEPROM (IC302)

6

IC

—

Internal connection terminal (connected to ground)

7

X2

O

Main system clock output terminal (4.194304 MHz)

8

X1

I

Main system clock input terminal (4.194304 MHz)

9

VDD

—

Power supply terminal

10

XT1

I

Sub system clock input terminal (32.768 kHz)    Not used (open)

11

XT2

O

Sub system clock output terminal (32.768 kHz)    Not used (open)

12

RESET

I

System reset signal input from the reset signal generator (IC304)    “L”: reset
For several hundreds msec. after the power supply rises, “L” is input, then it changes to “H”

13

REMOTE

I

Remote control signal input from the remote control receiver (X302)

14

PWRFAIL

I

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

15

RDSCLK

I

Serial data transfer clock signal input from the RDS decoder (IC305)    Not used

16

CDCLK

I

Serial data transfer clock signal input from the CD block

17

SENSORB

I

Tape sensor input terminal    Not used (open)

18

SENSORA

I

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

19

CD DOOR SW

I

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

20 to 23

CDIN2 to CDIN5

I

Not used (open)

24

AMS

I

Whether a music is present or not from BA335 (U14) is detected at auto music sensor
“L”: music is not present,  “H”: music is present

25

ENCODERA

I

Jog dial pulse input from the rotary encoder (X303 VOLUME) (A phase input)

26

ENCODERB

I

Jog dial pulse input from the rotary encoder (X303 VOLUME) (B phase input)

27

AVSS

—

Ground terminal

28

KEY1

I

Key input terminal (A/D input)    SW301 to SW305 (I/1, TUNER, TAPE, CD, PLAY MODE 
RDS/DIR) keys input    (RDS: used for the AEP, UK models)

29

KEY2

I

Key input terminal (A/D input)
SW306 to SW309 (x, X, Y, TUNER MEM ENTER) keys input

30

KEY3

I

Key input terminal (A/D input)    SW310 to SW312 (PRESET +/–, DISPLAY) keys input

31

KEY4

I

Key input terminal (A/D input)
SW313 to SW315 (TUNING – . m, TUNING + M >, MUSIC MENU) keys input

32

KEY5

I

Key input terminal (A/D input)    SW316, SW317 (MEGA BASS, z) keys input

33

ANALYZER

I

Analyzer level detection signal input terminal (A/D input)    Not used (open)

34

TUNED

I

Tuning detection signal input from the LA1837 (U1) (A/D input)    “L”: tuned

35

RDSDATA

I

Serial data input from the RDS decoder (IC305)    Not used

36

AVDD

—

Power supply terminal

37

AVREF

I

Reference voltage input terminal

38, 39

CDOUT1, CDOUT2

O

Not used (open)

40

VSS

—

Ground terminal

41

CDOUT3

O

Not used (open)

42

CDDATA

I/O

Two-way data bus with the CD block

43

CDRESET

O

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