SD-EX100H (serv.man21) - Sharp Audio Service Manual (repair manual). Page 9

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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.