CFD-E55 - Sony Audio Service Manual (repair manual). Page 38

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Pin No.

Pin Name

I/O

Description

1

C-SCOR

I

Subcode sync (S0+S1) detection signal input from the CXD2589Q (IC703)

2

RMC

I

Sircs remote control signal input terminal    Not used (fixed at “L”)

3

BUZZER

O

Buzzer sound signal output terminal

4

LED

O

LED drive signal output of the ALARM indicator (D602)    “L”: LED on

5

C-SENS

I

Internal status signal (sense signal) input from the CXD2589Q (IC703)

6

C-SENS2

I

Internal status signal (sense signal) input from the CXA1992BR (IC701)

7

C-SQCK

O

Subcode Q data reading clock signal output to the CXD2589Q (IC703)

8

C-SQSO

I

Subcode Q data input from the CXD2589Q (IC703)

9

C-RST

O

System reset signal output to the CXA1992BR (IC701) and CXD2589Q (IC703)    “L”: reset

10

C-CLOCK

O

Serial data transfer clock signal output to the CXD2589Q (IC703)

11

C-LATCH

O

Serial data latch pulse signal output to the CXD2589Q (IC703)

12

C-DATA

O

Serial data output to the CXD2589Q (IC703)

13

REC

I

Record/playback detection signal input terminal    “L”: recording mode, “H”: playback mode

14

R-COUNT

I

PLL serial data input from the FM/AM PLL (IC2)

15

R-DATA

O

PLL serial data output to the FM/AM PLL (IC2)

16

R-CLOCK

O

PLL serial data transfer clock signal output to the FM/AM PLL (IC2)

17

R-LATCH

O

PLL serial data latch pulse signal output to the FM/AM PLL (IC2)

18

V-LATCH

O

Serial data latch pulse signal output to the electrical volume (IC302)

19

V-DATA

O

Serial data output to the electrical volume (IC302)

20

V-CLOCK

O

Serial data transfer clock signal output to the electrical volume (IC302)

21

P-CON

O

Power on/off control signal output to the power supply circuit, and power amplifier (IC303)
“L”: standby mode, “H”: power on

22

DC1

I

DC level check input of the dry battery and AC input (+9V check) (A/D input)

23

DC2

I

DC level check input of the dry battery (+6V check) (A/D input)

24

DC3

I

DC level check input of the dry battery (+3V check) (A/D input)

25

KEY1

I

Key input terminal (A/D input)    S601 to S606 (ALARM, TIMER, SLEEP, DISPLAY, MEM 
ENT, PLAY MODE  MONO/ST  ISS, SOUND keys input)

26

KEY2

I

Key input terminal (A/D input)    S609 to S615 (x, u, CLOCK, MEGA BASS, START/
STOP, . # CLOCK, > 3 CLOCK keys input)

27

KEY3

I

Key input terminal (A/D input)    S617, S619 to S624 (POWER, BAND, VOL +, VOL –, 
PRESET –, PRESET +, AUTO PRESET keys input)

28

MODE CHECK

I

Destination setting terminal

29

SHIFT CLOCK

O

Shift clock output of the main system clock (4.19 MHz)    “H” active
Initial setting signal output terminal

30

RST

I

System reset signal input from the reset signal generator (IC503)    “L”: reset
For several hundreds msec. after the power supply rises, “L” is input, then it changes to “H”

31

EXTAL

I

Main system clock input terminal (4.19 MHz)

32

XTAL

O

Main system clock output terminal (4.19 MHz)

33

VSS

—

Ground terminal

34

VL

O

Liquid crystal display drive bias control signal output terminal

35 to 37

VLC3 to VLC1

—

Terminal for doubler circuit capacitor connection to develop liquid crystal display drive voltage

38 to 41

COM0 to COM3

O

Common drive signal output to the liquid crystal display (LCD501)

42 to 64

SEG0 to SEG22

O

Segment drive signal output to the liquid crystal display (LCD501)

65

MOTOR ON

O

Capstan/reel motor (M301) on/off control signal output terminal

66

A-MUTE

O

Audio muting on/off control signal output to the electrical volume (IC302)    “H”: muting on