NAS-50HDE, SS-50HDE - Sony Audio Service Manual (repair manual). Page 6

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This model provides the following three ways to eject the CD when the CD disc tray will not open.
The CD disc tray can be opened by any of the following methods.

While pressing the  CD Z  button, turn the AC power ON (with power cord connected) to open the CD disc tray.

While the AC power has already been turned on (with power cord connected), insert a thin flat-head screwdriver into the outer hole on the
bottom panel as shown below to establish a short-circuit between the two printed patterns of the CD-ROM drive board. The CD disc tray will
open.

1. While the AC power has already been turned on (with power cord connected), remove the cover (top), case (L), case (R) and front panel.
2. Insert a thin screwdriver tip into the emergency eject hole as shown and push the screwdriver in the direction shown by the arrow A. The

CD disc tray will open.

Establish a short-circuit
between the two printed patterns.

Printed patterns

Flat-head screwdriver

A

View from the bottom 

Screwdriver

tray

Emergency eject hole