CDX-MP40

SECTION 3

DIAGRAMS

3-1. IC PIN DESCRIPTIONS

• IC3 HD6432238RWN35TEI (CD MASTER CONTROL) (SERVO BOARD)

Pin No.

 

Pin Name

I/O

 

Pin Description

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

 

 

 

 

 

 

 

 

 

 

 

 

I

Test mode selection pin Not used. (Open)

 

 

 

 

 

TEST

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2

 

DECXRST

O

Reset signal output to the DSP IC

“L”: reset

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3

 

DECSTBY

O

Standby mode control signal output to the DSP IC “H”: standby

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4 – 7

 

 

 

 

 

NC

O

Not used. (Open)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

8

 

 

 

 

 

PH3

I

CD PH3 photo sensor detection signal input

Not used. (Open)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

9

 

INSW/PH2

I

CD mechanism disc in switch detection signal input

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

10

 

 

 

 

 

 

 

 

 

 

 

I

CD mechanism in-limit switch detection signal input

 

LIMIT_SW

11

 

 

 

 

 

 

 

 

 

 

I

CD mechanism down switch detection signal input

 

 

 

D_SW

12

 

 

 

CVCC

—

System power supply pin (+3.3 V)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

13

 

 

 

 

 

NC

O

Not used. (Open)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

14

 

 

 

 

 

VSS

—

Ground pin

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

15

 

 

 

 

 

NC

O

Not used. (Open)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

16

 

 

 

 

 

 

 

 

 

I

CD PH1 photo sensor detection signal input

Not used. (Open)

 

 

 

 

 

PH1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

17

 

 

EJECT

O

CD mechanism loading motor control signal output (eject operation)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

18

 

 

 

LOAD

O

CD mechanism loading motor control signal output (load operation)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

19 – 26

 

 

 

 

 

NC

O

Not used. (Open)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

27

 

 

 

FLAG

I

Correction unable detection signal input

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

28

 

 

 

RFOK

I

RFOK signal input from the servo IC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

29, 30

 

 

 

 

 

NC

O

Not used. (Open)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

31

 

 

 

 

TXD

O

UART TXD PC connection output

Not used. (Open)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

32

 

 

 

 

RXD

I

UART RXD PC connection input

Not used. (Open)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

33

 

 

XTALEN

O

Crystal oscillation control signal output to the servo IC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

34

 

 

 

 

TSTB

O

CD text parameter strobe signal output to the servo IC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

35

 

 

 

 

 

STB

O

Data strobe signal output to the servo IC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

36

 

 

 

 

 

A0

O

Command/parameter identification signal output to the servo IC

 

 

 

 

 

“L”: command, “H”: parameter

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

37

 

 

CD_RST

O

Reset signal output to the servo IC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

38

 

 

 

 

 

 

 

I

CD text pack sync signal input from the servo IC

 

 

 

 

PACK

39

 

 

 

 

 

NC

O

Not used. (Open)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

40

 

 

 

 

I

CD mechanism self load position detection switch signal input

 

 

SELF_SW

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

41

 

 

 

 

 

NC

O

Not used. (Open)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

42

 

 

 

 

AVSS

—

Ground for A/D converter

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

43, 44

 

 

 

 

 

NC

O

Not used. (Open)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

45, 46

 

 

 

 

 

NC

I

Not used. (Open)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

47

 

 

 

 

KEY0

I

Key switch signal input in the test mode Not used. (Open)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

48

 

 

 

 

KEY1

I

Mode switch signal input in the test mode

Not used. (Open)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

49 – 52

 

 

 

 

 

NC

I

Not used. (Open)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

53

 

 

AVREF

—

Reference voltage for A/D converter

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

54

 

 

 

AVCC

—

Power supply for A/D converter

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

55

 

 

 

 

MD0

—

CPU operation mode setting pin

Connecting to +3.3 V in this set.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

56

 

 

 

 

MD1

—

CPU operation mode setting pin

Connecting to +3.3 V in this set.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

57

 

 

 

 

X1A

—

Sub clock oscillator terminal

Not used. (Open)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

58

 

 

 

 

X0A

—

Sub clock oscillator terminal

Not used. (Open)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

59

 

 

 

 

RSTX

I

Microcomputer reset signal input

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

60

 

 

 

 

NMI

—

Not used. (Fixed at “H”)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

61

 

 

 

 

STBY

—

Not used. (Fixed at “H”)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

62

 

 

 

 

VCC

—

Power supply pin (+3.3 V)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

63

 

 

 

XTAL

—

Main clock oscillator pin (12.288 MHz)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

64

 

 

 

 

 

VSS

—

Ground pin

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

65

 

 

XTEAL

—

Main clock oscillator pin (12.288 MHz)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

66

 

 

 

 

FWE

I

Flash write enable signal input

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

15

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Sony service manual CDX-MP40 Section Diagrams, IC PIN Descriptions
Page 14 Page 16

CDX-MP40 specifications

The Sony CDX-MP40 is a versatile car audio receiver designed to enhance the in-car listening experience. Known for its combination of modern features and reliable performance, this model has gained popularity among music enthusiasts who value both functionality and sound quality.

At the core of the CDX-MP40 is its CD playback capability, allowing drivers to enjoy their favorite albums on the go. The device is compatible with CD-Rs and CD-RWs, ensuring a wide range of playback options. In addition to traditional CDs, the CDX-MP40 stands out with its MP3 playback capability, enabling users to load hundreds of tracks onto a single disc. This eliminates the clutter of multiple CDs, making music access more convenient during long drives.

One of the key features of the CDX-MP40 is its front auxiliary input, which allows for seamless connection of external devices such as smartphones and MP3 players. This connectivity expands the range of audio sources available to users and makes it easy to stream music from various devices. Moreover, the receiver offers an option for optional USB connectivity, providing even more versatility for music playback.

The CDX-MP40 also benefits from advanced technologies to improve sound quality. With 52 watts of peak power per channel, this unit delivers robust audio performance that can fill any car with rich sound. The built-in EQ (equalizer) presets allow users to customize their audio settings based on musical preferences, while the additional power output ensures that even at high volumes, the sound remains clear and undistorted.

Safety and usability are also prioritized in the design of the CDX-MP40. The user interface is straightforward, featuring a large, easy-to-read display and intuitive controls, making it user-friendly for drivers. The electronic skip protection feature minimizes playback interruptions, ensuring a smooth listening experience even on bumpy roads.

In summary, the Sony CDX-MP40 is a well-rounded car audio solution, equipped with essential features such as CD and MP3 playback, auxiliary input, and USB connectivity. With powerful audio performance and user-friendly controls, it caters to a wide array of audio preferences, making it an excellent choice for anyone looking to upgrade their in-car entertainment system. Its blend of modern technology and classic functions establishes the CDX-MP40 as a reliable option for car audio enthusiasts.
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