Panasonic SA-AK640E Service Manual page 205

5.3.2. When CD in the tray
Step 1: Check any disc tray at the play position from the
mechanism side.
Step 2: Press the 2 claws and then lift up the top cover as
arrows shown.
Caution: Do not exert strong force on the claws.
Step 3: Release the top cover from the tray rear stopper
as arrow shown and remove the top cover.
Step 4: Remove the open lever spring.
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