Panasonic SA-AK631PL Service Manual page 29

Step 8 Release the 2 claws, and then remove the relay gear A.
Step 9 Release the 2 claws, and then remove the spindle shaft.
Step 10 Remove the lower spindle spring with tweezers.
Step 11 Force the lower hook with thin tip of minus screwdriver.
Step 12 Squeeze the shaft of lower hook, and then draw it.
Step 13 Rotate the lower spindle in the direction of arrow until
the lower spindle interferes with stopper.
Step 14 Insert the thin tip of minus screwdriver between the
lower spindle and UP/DOWN base, and then slacken the lower
spindle to release the stopper. Then, rotate the lower spindle
and remove it.
Step 15 Rotate the UP/DOWN base at a 90° angle. Then,
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SA-AK63 1PL