Panasonic SA-HT990E Service Manual page 36

Step 2 Raise the loading unit.
Step 3 Slide the lever in the arrow direction till it stops and pull the tray out.
Step 4 Spread the tabs at the both sides and pull the tray out. (The tray slides a little forword
and stops.).
Step 5 Remove the drive arm concave phase from the tray slider and tray.
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