Panasonic ES-LS9A-K820 Operating Instructions Manual page 26

Problem
The shaving sensor
does not respond.
26
Action
Depending on the beard
thickness or the amount of
beard trimmings in the
shaver head, the shaving
sensor may not react and the
driving sound may not
change. This is not abnormal.
The shaving sensor may not
respond depending on the
type and quantity of the
shaving gel. This is not
abnormal.
The shaving sensor may not
respond when the remaining
battery capacity is low. If
this happens, recharge the
shaver.
Apply oil. (See page 18.)
The shaving sensor may not
respond when there is not
enough oil on the system
outer foil.
Problem
The shaving sensor
responds even though
the shaver is not in
contact with the skin.
Action
Clean the beard trimmings
from the shaver.
Clean the system outer foil
with the brush. (See
page 19.)
When the shaver is
extremely dirty, remove the
foil frame and wash with
water.
(See page 17.)
Replace the system outer foil.
Expected life of system
outer foil:
Approximately 18 months