Panasonic SC-HC20GA Service Manual page 47

Step 2 : Slot in the one end of the Door Shaft into the hole as
shown in the diagram above.
Step 3 : Push the Door Shaft downwards and slot it into the
hole.
Step 4 : Upset the Front Cabinet Unit.
Step 5 : Push the Door Shaft as arrow shown.
Step 6 : Make sure that the Door Shaft is fixed by the Catch.
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