Panasonic SA-AK220E Service Manual page 13

Step 4 Release the 2 claws, and then remove the CD Lid.
Step 5 Press the OPEN/CLOSE button, the disc tray will close.
[Open the disc tray manually (Using service tools)]
Step 1 Insert the gear tool into the hole on the underside of CD
chassis and then rotate in the direction of arrow. The disc tray
will be open.
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SA-AK220E / SA-AK220EB