Panasonic SA-PT480PH Service Manual page 75

Step 2 Slot the traverse unit approximately 45° into the mecha
chassis as arrow shown.
Note: Ensure the bosses fix exactly onto the guides.
Step 3 Place down the traverse unit as arrow shown.
Step 4 Release the guide and slide the traverse slide plate (rib)
in the direction of arrows shown to lock in the traverse unit.
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