CX-680
2. MECHANISM DESCRIPTIONS
- Disc loading
1. Three phototransistors are provided in front and4. The clamper arm has the disc centering mecha-
rear of the rubber roller for disc transfer. Light isnism to determine disc size and clamp the disc to
received from three LEDs corresponding the pho-the center of the spindle motor. The centering
totransistors. (Voltage of the phototransistors isarms are provided on the right and left of the
OL� when receiving light.)clamper arm, and move around the supporting
2. The voltage of the front phototransistor (P1)point. The end of centering arm has a lock arm (ro-
changes to OH� when disc is inserted and reachestates around the centering pin, and is locked to the
immediately before the rubber roller. As a result,clamper arm when an 8-cm disc is inserted).
the loading motor is activated to drive.5. The lock arm is unlocked when a 12-cm disc is in-
3. The driving power of the motor is conveyed by theserted, and moves to the position shown in Fig. 21.
gear to rotate the rubber roller and transfer theThe position of the detection arm, having the cen-
disc. The rubber roller is located at an end of theter of rotation on the right centering arm as shown
in Fig. below, is different for 8-cm and 12-cm discs.
loading arm, and in condition to lift the guide arm.
The guide arm is driven by two springs so that theThe detection arm moves clockwise according to
guide arm and rubber roller obtain appropriateouter diameter when disc is positioned on the
pressure to transfer disc between them.spindle to move the detection lever downward as
shown in the illustration.
Centering armCentering armDetection arm
Detection leverClamper arm
Lock arm
8-cm discLock arm
Rubber roller
Phototransistor P2Loading arm
Phototransistor P1Guide arm Loading motor
Phototransistor P3
Fig. 20
Fig. 21When 12-cm disc is inserted
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ACEC
