Kenwood DPC-MP727, Service Manual

DPC-MP727/MP922

4

CIRCUIT DESCRIPTION

Port No.

Port Name

I/O

Function

ACTIVE

H

L

67~69

P70~P72

-

Unused.

70

3T

I

RF 3Tcompensation.

71

OFTR

I

Changeover the off track.

72

P75

-

Unused.

73

PUP1

I

Pull up port.

74

PUP2

I

Pull up port.

75

NMI

I

Pull up port.

76

BLKCK

I

Sub code block clock signal input.
f BLKCK=75Hz(usual playback)

77

DOOR

I

Detection port of door switch.

78

LIMIT

I

Detection port of limit switch.

79

WUP

I

Return signal input from CPU (46pin).

80

HINT

I

Signal input from DSP (IC3) to return the usual action.

81

PA5

-

GND

82

RST

I

Reset signal input.

83

VDD

-

+3.0v power supply.

84~91

HD0~HD7

I/O

Data bus (0~7) input/output.

92

VSS

-

GND

93

HCNTL0

O

Control command output for reading and writing.

94

HCNTL1

O

Control command output for reading and writing.

95

HR/W

O

Read write signal output.

96

HBIL

O

Interface setting port.

97

HCS

O

CS signal output.

98

HAS

O

Interface setting port.

99

HDS

O

Interface setting port.

100

HRDY

O

Ready signal output.

Port No.

Port Name

I/O

Function

ACTIVE

H

L

1

DVDD3V

-

DRAM interface power supply.

2,3

D0,D1

I/O

DRAM data input/output signal (D0,D1).

4

NEW

O

DRAM writing enable signal.

5

NRAS

O

DRAM RAS control signal.

6,7

D2,D3

I/O

DRAM data input/output signal (D2,D3).

8,9

NCAS(0,1)

O

DRAM CAS control signal (0,1).

10~19

A8~A3

O

DRAM address signal (A8~A3).

20

DVSS2

-

Digital ground.

21

DVDD2

-

Digital power supply.

22

SPOUT

O

Spindle motor drive signal output.

23

TRVM

O

Traverse drive positive output.

24

TRVP

O

Traverse drive negative output.

25

TRM

O

Tracking drive positive output.

26

TRP

O

Tracking drive negative output.

27

FOM

O

Focus drive positive output.

28

FOP

O

Focus drive negative output.

29

FBAL

O

The balance adjustment for the focus error.

30

TBAL

O

The balance adjustment for the tracking error.

31

VREF

I

DA reference voltage input.

32

FE

I

Focus error signal input.

33

TE

I

Tracking error signal input.

34

FRENV

I

RF envelope signal input.

35

OFT

I

Off track signal input.

Off Track

2. Port Description of DSP IC (IC15)

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2

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8

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9

2

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9

4

2

9

8

0

5

1

5

1

3

6

7

3

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