Panasonic SA-AK52 Service Manual page 17

Step 1 Slide the drive rack fully in the direction of the arrow.
Step 2 Holding the drive rack, not to move, install the disc tray.
Step 3 Align the drive rack with the drive gear.
Step 4 Holding the disc tray manually, rotate the pulley gear in
the direction of arrow.
Step 5 Rotate the gear 5 or 6 times manually, and then push
the disc tray.
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SA-AK52