Philips PT717 Mode D'emploi page 11

5 Remove the shaving heads and place new ones in the shaving unit.
Note: Make sure that the projections of the shaving heads it exactly into the
recesses.
6 Put the retaining frame back into the shaving unit (A) and turn the
lock clockwise (B).
7 Insert the lug of the new shaving unit into the slot in the top of the
shaver. Then close the shaving unit.
Note: If the shaving unit does not close smoothly, check if you have inserted
the shaving heads properly and if the retaining frame is locked.
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