Philips HQ7740 User Manual page 14

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Replacement
Replace the shaving heads every two years for
optimal shaving results.
Replace damaged or worn shaving heads with
HQ177 Philips Cool Skin shaving heads only.
Replacing the shaving heads
1 Switch the shaver off.
2 Press the release button to open the
shaving unit.
3 Turn the wheel anticlockwise (1) and
remove the retaining frame (2).
4 Remove the shaving heads and place new
ones in the shaving unit.
5 Put the retaining frame back into the
shaving unit, press the wheel (1) and turn it
clockwise (2).