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4Turn the lock anticlockwise (1) and remove the retaining frame (2).

5Remove the shaving heads and place new ones in the shaving unit.

Make sure that the projections of the shaving heads fit exactly into the recesses.

6Put the retaining frame back into the shaving unit and turn the lock clockwise.

7Insert the lug of the shaving unit into the slot in the top of the shaver (1).Then close the shaving unit (2).

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.

Accessories

To retain the top performance of your shaver, make sure you clean it regularly and replace its shaving heads at the recommended time.

Shaving heads

-- We advise you to replace your shaving heads every year. Always replace with HQ9 Philips Shaving Heads (for AT940/AT921) or HQ8 Philips Shaving Heads (for AT893/AT890/AT753/AT752/ AT750).

Cleaning

-- Use Cleaning spray (HQ110) to clean the shaving heads thoroughly.

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Philips AT921 manual Accessories, Shaving heads, Cleaning