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– 110 –

The block diagram is shown in Figure 5-23.

Figure 5-23.

Front door open/close

IC101

Motor Driver

IC136

Drive Control

DFWD

DRVS

DSW2

DSW1

IC152

MB-75 BOARD

9

OUT1

7

6

5

CN009

4

M301

D MTR–

D MTR+

94

IC090

System Control

IC021

Interface Micom

95

7

OUT2

2 IN1

4 IN2

M

PH131

Vcc

PH132

Vcc

FP-411 BOARD

14

15

16

CN101

17

DOOR O/C

S110

DR-84 BOARD CN-99 BOARD

4

5

1

CN131

2

4

5

1

CN102

2

1

CN132

3

1

CN302

3

Front Door

Motor

10

11

CN009

CN101

85

AD1

Extended

Input

Port

3

2

DSW2

DSW1

Door Close

Sensor

Door Open

Sensor

– 111 –

The motor driver IC (IC101 on FP-411 board) can rotate the motor forward or reverse, and

apply or release the brake according to a combination of logics applied to the inputs (2,
4P). The following shows the truth table for the inputs in each mode.

 Mode

IN1 (2P)

IN2 (4P)

OUT1 (9P)

OUT2 (7P)

 Door open (FWD)

H

L

H

L

 Door closed (REV)

L

H

L

H

 Brake applied

H

H

L

L

 Brake released

L

L

OFF

OFF

The door position is detected with two photo-interrupters (PH131, 132) on the DR-84 board.

The relation between door status and respective signals is as follows:

 Mode

<Door Close Sensor>

<Door Open Sensor>

 Door open position

L

H

 Door operating

L

L

 Door closed position

H

L

– 112 –

(1) Door open operation

If the door OPEN/CLOSE button is pressed when the door is closed, the AD1 signal of

CN101!ºP on FP-411 board becomes about +1V from +5V. This signal is sent to the

system controller IC090 from the FP-411 board via interface microcomputer IC021 on

the MB-75 board. When the system controller recognizes it, the drive control (IC136

on MB-75 board) makes DFWD signal ((¢P) “high” and DRVS signal ((∞P) “low”,

and they are entered respectively to the IN1 (2P) and IN2 (4P) of motor driver (IC101

on FP-411 board). At this time, the outputs OUT1 (9P) and OUT2 (7P) become +5V

and GND respectively, then the motor rotates forward and the door opens.

(2) Door open position detection

The door open position is detected with a photo-interrupter (PH132) on the DR-84

board. When the door reached the open position, the PH132 output signal DSW1 changes

from “L” to “H”. This signal is entered from FP-411 board to the drive control IC136

via IC152 on the MB-75 board.

Then, the drive controller makes both DFWD and DRVS signals “low” to release the

brake.

Under this condition, the motor stands still and the door is left open.

(3) Door close operation

If the door OPEN/CLOSE button is pressed when the door is open, the AD1 signal of

CN101!ºP on FP-411 board becomes about +1V from +5V. This signal is sent to the

system controller IC090 fromthe FP-411 board via interface microcomputer IC021 on

the MB-75 board. When the system controller recognizes it, the drive control (IC136

on MB-75 board) makes DFWD signal ((¢P) “low” and DRVS signal ((∞P) “high”,

and they are entered respectively to the IN1 (2P) and IN2 (4P) of motor driver (IC101

on FP-411 board). At this time, the outputs OUT1 (9P) and OUT2 (7P) become

GND and +5V respectively, then the motor reverses and the door is closed.

(4) Door closed position detection

The door closed position is detected with a photo-interrupter (PH131) on the DR-84

board. When the door reached the closed position, the PH131 output signal DSW2

changes from “L” to “H”. This signal is entered from FP-411 board to the drive control

IC136 via IC152 on the MB-75 board.

Then, the drive controller makes both DFWD and DRVS signals “low” to release the

brake.

Under this condition, the motor stands still and the door is left closed.

– 113 –

A disc sensor is arranged near the spindle motor to judge whether a disc is CD or DVD.

The disc sensor tilts 18 degrees to the perpendicular line of disc, and it consists of an infrared

emitting diode as light emitting element and a photodiode as light receiving element.

The disc sensor detects the quantity of primary beam that diffracts at pits in disc.

As the track pitch is different between DVD (track pitch 0.74µm) and CD (track pitch 1.6µm),

the optical axis of primary beam is different between DVD and CD, as shown in Figure 5-

24.

The disc judging sensor is arranged on the optical axis of primary beam for the CD disc, and

therefore the detected light quantity (current) is CD disc > DVD disc.

The disc sensor output (detection) current signal (DET: TT-701 board, CN0021P) is

converted in logic level from current to voltage by the IC003 (CP AMP NJM3404AM) on

the TT-701 board, then entered to the (¡P of IC136 (microcomputer for drive: HD6413002F)

on the MB-75 board as a disc judging signal (CD DET).

Disc judgment is made by emitting a beam maximum 3 times like pulses (about 7ms)

immediately after disc loading 

→

 chucking 

→

 disc rotation started.

The disc judging signal is as shown below:

 Disc

Disc judging signal CD DET

H

H
L
H
L
H
L

Judgment timing

L

H

 DVD

 CD

 None