Kenwood MDX-G1, Service Manual

MDX-G1

8

CIRCUIT DESCRIPTION

Input Voltage

KEY 1

KEY 2

(V)

Pin94

Pin93

0.00

0.45

AUX

POWER

0.48

1.10

REC

MD EJECT

1.13

1.78

BEST HITS

SKIP DOWN

1.81

2.37

SOUND

STOP

2.41

2.80

SET

SKIP UP

2.84

3.25

MENU

MD PLAY/PAUSE

3.29

3.68

VOL DOWN

CD PLAY/PAUSE

3.72

4.22

VOL UP

BAND

ú

ìì

ìì

4.24

4.60

KEY OFF

KEY OFF

7-2 Key Matrix

*The input voltage value : for 4.6[V] in a standard voltage.

Port No.

Port Name

I/O

Description

Active

H

L

1

SEL DATA

O

Data output to electric volume system IC.

2

SEL CLK

O

Clock output to electric volume system  IC.

3

SLTSW

I

CD start limit switch input.

4

XRST

O

Reset signal output to CD DSP.

Reset

5

NC

-

Unused.

6

SUBQ

I

CD sub code input.

7

SQCK

O

Clock output for CD sub code.

8

BYTE

-

Connected to ground.

9

CN VSS

-

Connected to ground.

10

XC IN

I

Timer clock input (32.768kHz).

11

XC OUT

O

Timer clock output (32.768kHz).

12

RESET

I

Reset signal input for microcomputer.

Reset

13

X OUT

O

Main clock output (10MHz)

14

VSS

-

Connected to ground.

15

X IN

I

Main clock input. (10MHz)

16

VCC(BU)

-

Supply power input (+5V).

17

NMI

-

Supply power input (+5V).

18

REM

I

Remote control signal input.

19

NC

-

Unused.

20

BLKCK

I

Sub code synchronous signal input.

21

CE

I

Chip enable input for back up detection.

AC On

AC Off

22

NC

-

Unused.

23

MLD

O

CD DSP command load signal output.

24

OP/CL SW

I

Input port of detection switch for CD open/close.

25

MD CE

I

Detection port for MD back up.

26

MD RST

I

Reset output from MD mechanism.

27

MD IN SW

I

Load switch input for MD disc.

28

MCLK

O

CD DSP command clock signal output.

29

STAT

I

CD DSP status signal input.

30

MDATA

O

CD DSP command data output.

31

MD TXD

O

MD communication TX .(to mecha. u-com RX)

32

MD RXD

I

MD communication RX .(to mecha. u-com TX)

33

AMP 

O

Control port of standby switch for power amplifier.

34

AMUTE

O

Audio mute output.

35

FL DATA

O

Data output to FL dot driver.

36

NC

-

Unused.

37

FL CLK

O

Clock output to FL dot driver.

7-3 Port Description of Microcomputer

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9

2

8

9

4

2

9

8

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9

9

2

8

9

4

2

9

8

0

5

1

5

1

3

6

7

3

Q

Q

TEL  13942296513  QQ  376315150  892498299 

TEL  13942296513  QQ  376315150  892498299