Marantz SUPER AUDIO CD PLAYER SA8400 - Manual (Page 6)

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4. TAKING THE DISC OUT OF EMERGENCY
1. To open the stucked tray, insert a pin into the eject pinhole and push the eject lever.
2. Use a pin
φ
4mm or less.
This picture shows the unit upside down. The eject lever is pointed by the arrow.
The lever is thin so aim the narrow area carefully.