HCD-M70 - Sony Audio Service Manual (repair manual). Page 35

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Pin No.

Pin Name

I/O

Description

1

SENSOR

I

Tape end detect switch input terminal    “H” input when the tape end detected

2

RDS-IN

I

Serial data transfer clock signal input from the RDS decoder
(RDS decoder is used for the AEP and UK models)

3

SIRCS

I

Sircs remote control signal input

4

NC

—

Not used

5

TU-DATA           O

Serial data output to the tuner unit

6

T-MODE

I

Head position detect switch input terminal    “L”: forward direction, “H”: reverse direction

7

REG-CON

O

Main system power supply on/off control signal output    “H”: power on

8

C-CLK/TU-CLK

O

Serial data transfer clock signal output to the digital signal processor (at CD function)
Serial data transfer clock signal output to the tuner unit (at tuner function)

9

SPK PROTECT

I

Protect on/off control signal input from the speaker protect circuit    “L”: protect on

10

CD-DATA           O

Serial data output to the digital signal processor

11

C-SQCK

O

Subcode Q data reading clock signal output to the digital signal processor

12

C-SQSO/

RDS-DATA

I

Subcode Q data input from the digital signal processor (at CD function)
Serial data input from the RDS decoder (at tuner function)
(RDS decoder is used for the AEP and UK models)

13

HOLD

O

Automatic power control hold signal output to the RF amplifier

14

ALC

O

Automatic limiter control signal output to the recording/playback equalizer amplifier
“H”: limiter on

15

CD-ON

O

Power supply on/off control signal output for the CD section (+5V)
LED drive signal output of the CD indicator    “H”: CD power on (LED on)

16

REC-MUTE

O

Recording muting on/off control signal output to the recording/playback equalizer amplifier
“L”: muting on

17

TUNED

I

Automatic limiter control signal input from the tuner unit

18

C-SENSE

I

Internal status detection monitor input from the digital signal processor

19

C-LATCH

O

Serial data latch pulse signal output to the digital signal processor

20

L-MUTE

O

Line muting on/off control signal output to the recording/playback equalizer amplifier
“H”: muting on

21

REC/PB

O

Recording/playback selection signal output to the tape section
“L”: playback mode, “H”: recording mode

22

AMP-MUTE

O

Muting on/off control signal output to the power amplifier     “H”: muting on

23

TU-COUNT

I

PLL serial data input from the tuner unit

24

H/P CHK

I

Headphone jack connection detection signal input terminal
“L”: no connected, “H”: headphone connected

25

TU-ON

O

Power supply on/off control signal output for the tuner section (+9.5V)
LED drive signal output of the TUNER indicator    “H”: tuner power on (LED on)

26

DSG

O

LED drive signal output of the DSG (Dynamic Sound  Generator) indicator    “H”: LED on

27

CD-SYNC

O

LED drive signal output of the CD SYNCHRO indicator    “H”: LED on

28

SCK

O

Serial data transfer clock signal output to the electrical volume

29

SOL-CON

O

Trigger plunger on/off control signal output    “H”: plunger on

30

MOT-CON

O

Capstan/reel motor on/off control signal output    “H”: motor on

31

TU-CE

O

Chip enable signal output to the tuner unit

32

TC-SW

I

Half detect (side A and B) switch and cassette in detect switch input terminal (A/D input) 

33

TRAY-SW

I

Disc tray open/close detect switch input terminal (A/D input)
 “L”: disc tray open,  “H”: disc tray close

34 to 36

KEY3 to KEY1

I

Key input terminal (A/D input)

37

SIMUKE

I

Destination setting terminal (A/D input)