Panasonic SA-AK22 Service Manual page 29

Step 3 Align the drive rack with the driver 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.
9. Self-Diagnostic Function
9.1. Self-diagnostic display
This unit is equipped with a self-diagnostic display function which, if a problem occurs, will
display an error code corresponding to the problem.
Use this function when performing maintenance on the unit.
9.2. How to enter the Self-Diagnostic Function