HCD-DZ7T - Sony Audio Service Manual (repair manual). Page 6

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This product incorporates copyright protection technology that is
protected by U.S. patents and other intellectual property rights. Use
of this copyright protection technology must be authorized by
Macrovision, and is intended for home and other limited viewing
uses only unless otherwise authorized by Macrovision. Reverse
engineering or disassembly is prohibited.

This system incorporates with Dolby* Digital and Dolby Pro Logic
(II) adaptive matrix surround decoder and the DTS** Digital
Surround System.

*

Manufactured under license from Dolby Laboratories.
“Dolby”, “Pro Logic”, and the double-D symbol are
trademarks of Dolby Laboratories.

** Manufactured under license from DTS, Inc.

“DTS” and “DTS Digital Surround” are registered trademarks
of DTS, Inc.

In some cases, CD-R/CD-RW/DVD-R/DVD-RW/DVD+R/
DVD+RW cannot be played on this system due to the recording
quality or physical condition of the disc, or the characteristics of
the recording device and authoring software.
The disc will not play if it has not been correctly finalized. For
more information, see the operating instructions for the recording
device.
Note that some playback functions may not work with some
DVD+RWs/DVD+Rs, even if they have been correctly finalized. In
this case, view the disc by normal playback. Also some DATA CDs/
DATA DVDs created in Packet Write format cannot be played.

Peel off the seal and so the lever is moved 
in the direction of the arrow with the thin rod. 

Insert a tapering driver into the aperture of the unit bottom, and slide it in the direction of the arrow.

seal

disc tray