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– 9 –

This is a vertical loading mechanism, which carries a CD to the playback point. Direct and reverse motors, equipped with the end
detection switches, control the CDs’ movement.

Opening/closing the tray: CD up/down mechanism
The mechanism carries a CD loaded in the tray to the playback point.
Since the center position differs between 8-cm and 12-cm discs, the tray is positioned by the photo sensor.
The sensor on the right of the slot detects the 12-cm disc.

Moving up/down the CD mechanism unit: back and forth mechanism
The mechanism moves the unit back and forth to load the medium on or unload the medium from the turntable.
When the mechanism is moved toward the front of the unit, the medium is loaded on the mechanism.

The both end switches and the photo sensor are used for detecting the tray position.
The plate with slits for position detection passes between photo interrupters located on the reverse side of the tray.

Open END SW

Open END SW

Close END SW

Close END SW

Light receiving element

Light emitting element

Light receiving element

Light emitting element

Open END SW

Eject END

Close END SW

Position sensor

< Open >

< Close >

12cm Disc Sensor

8cm
Loading position

12cm

Loading position

Load END

Tray opened

Photo interrupter

Tray closed

A CD on the tray passes between the photo interrupters. The signal is not detected when no CDs or an 8-cm CD is loaded.

– 10 –

The following terminals are used for control.

SW_Tray Eject

H/L

Switch input for tray eject completion detection

L: Position "Ejected"
H: other positions

SW_Tray Load

H/L

Switch input for tray loading completion detection

L: Position "Loaded"
H: other positions

SW_Mecha Up

H/L

Switch input for mechanism up completion detection

L: "UpEnd" position
H: other positions

SW_Mecha Down

H/L

Switch input for mechanism down completion detection

L: "DownEnd" position
H: other positions

PH_12cm Disc

H/L

Input of the photo sensor for detecting a 12-cm disc. The sensor detects the disc directly.
 At the detection position, L : 12-cm disc

                                   H : Others (interpreted as 8-cm disc)

PH_Tray

H/L

Input of the photo sensor for detecting the tray position. The tray is covered with a piece of tape.

L: a covered tray
H: a non-covered tape. Parts not covered, or a slit.

Sens_Jaming

A/Din

Port for overcurrent detection of the mechanism up/down motor

Port voltage > 1.65 V: abnormal. Considered as jamming.
Port voltage < 1.65 V: normal.

TRY_M+

D Aout

0V

Control output for tray control motor CW (EJECT direction)

TRY_M–

D Aout

0V

Control output for tray control motor CCW (LOADING direction)

MECHA_M+

H/L

L

Control output for mechanism up/down control motor CW (upward,
media loaded)

MECHA_M+

H/L

L

Control output for mechanism up/down control motor CCW
(downward, media removed)

=

– 11 –

The mechanism is initialized and checked in the following cases.
1. The power is turned on for the first time after resetting the microcomputer.
2. The mechanism is not in the loading or ejecting completed state when the power is turned on.

Initializing the mechanism

Start

End

Mechanism up

 switch

OK?

Close

Open

The tray moves downward until 
the close switch is turned on.

The CD mechanism moves 
downward until the switch is 
turned on.

The CD mechanism moves 
downward until the switch is 
turned on.

The tray moves upward until 
the open switch is turned on.

The tray moves downward until 
the close switch is turned on.

OK

OK?

OK?

OK

OK

OK?

OK

OK?

OK

NG

Er-CD TA?O0

NG

Er-CD TA?D0

NG

Er-CD TA?C0

The open switch
is checked.

The up/down 
motor and the 
down switch are
checked.

NG

Er-CD TA?D0

The up/down 
motor and the 
down switch are
checked.

The tray motor 
and the close 
switch are 
checked.

NG

Er-CD TA?C0

The tray motor 
and the close 
switch are 
checked.

– 12 –

The initialization procedures of the mechanism vary with the location of the CD mechanism

The following errors of the loading mechanism are detected.

Form Er-CD_TA: 

 

           

 :  represents the HEX value.

The combination of inputs is abnormal. Check the relevant switches and sensors.

MSB

LSB

7

Pu-in

Switch

6

5

4

3

2

1

0

Juming

Mecha Carrier

Sensor

UpEnd

DownEnd

OpenEnd

CloseEnd

Tray

12cm

Sensor

Position

Sensor

7

: Indicates whether the pickup is located in the inner periphery. If not, the operation of the mechanism is disabled.

6

: Detects the output of the jamming detection circuit when the power is on. If jamming is detected, check the circuit.

5, 4

: Test results of the tray end switch. If both ends are detected simultaneously, check the corresponding switch.

3

: Inspection is not conducted automatically.

2, 1, 0 : Test results of the position sensor input and the tray end switch.

Form Er-CD_TA: 

1

 

2

 

3

Each operation is not completed within the specified time. Check the relevant switches.

1

: Recognized disc size

 ?: Unknown
 8: 8 cm
 C: 12 cm

2

  Relevant switch

 U: mechanism up switch [SW_U]
 D: mechanism down switch [SE_D]
 C: tray close switch [SE_C]
 O: tray open switch [SE_O]

3

  Operation in which an error occurred

 0: initializing the mechanism
 1: loading
 2: ejecting
 3: ejecting the error
 4: recovering the error of the tray position
 5: recovering the error of the mechanism up/down
 6: recovering detection of jamming

Form Er-CD_TA_PH

Even if the tray is moved during operation, the tray position is not input.
Check the tray position sensor.

Er-CD

TA  80

The pickup is not located in the inner periphery. Check the CD circuit.

Er-CD

TA  40

The jamming detection circuit is activated improperly. Check the CD circuit.

Er-CD

TA  30

Both end switches of the back and forth mechanism are turned on.

Er-CD

TA  03

Both end switches of the up/down mechanism are turned on.

Er-CD

TA  22

The back/forth and the up/down mechanisms logically conflict with each other.

Er-CD

TA  06

The end switch of the tray logically conflicts with the position sensor.

Er-CD

TA  05

The end switch of the tray logically conflicts with the position sensor.

Er-CD

TA? D0

The CD mechanism cannot be moved backward when initializing the mechanism.

Er-CD

TA? C0

The tray cannot be lowered when initializing the mechanism.

Er-CD

TA? D2

The CD mechanism cannot be moved backward when ejecting.

Er-CD

TA? O0

The tray cannot be lifted when initializing the mechanism.

Er-CD

TA  PH

No input from the photo sensor when the tray is transferred.