Panasonic SA-AK631PL Service Manual page 31

Step 4 Install the slide plate 2 to the mechanism base, and
then match to the connection lever.
Step 5 Install the slide plate 1 to the mechanism base, and
then match to the connection leve and align the trapezoid tooth
of traverse relay gear with the slide plate 1.
Step 6 Install the spindle base unit. (First, slide plate 1.)
Step 7 Move the slide plate 1 to forward fully.
Step 8 Install the rear lock. (The claw should be latched.)
Step 9 Install the Spindle Position P.C.B.. (The claw should be
latched.)
Step 10 Install the tray lock. (The claw should be latched.)
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SA-AK63 1PL