Philips AT9 Series Manual page 12

ENGLISH
12
A
B
- Clean the inside and outside of the shaving guard with the brush.
6 Put the shaving heads back into the shaving unit.
Make sure that the projections of the shaving heads fit exactly
into the recesses.
7 Put the retaining frame back into the shaving unit (A) and
turn the lock clockwise (B).
8 Insert the lug of the 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.