Canon A420 - Manual (Page 91)

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If the LCD monitor displays the Date/Time menu when you turn on
the camera, this means that the date battery has run down and the
clock has stopped running. Please purchase a replacement battery
(lithium coin battery CR1220) and install it as follows.
Replacing the Date Battery
The date battery is preinstalled at the factory and may
therefore expire earlier than its rated lifespan after the
camera has been purchased.
Be particularly careful to keep the date batteries out of the
reach of children. Seek medical assistance immediately if a
child swallows a battery since corrosive battery fluids could
damage the stomach or intestinal wall.
1
Be sure that the camera is turned off.
2
Remove the battery
holder.
3
Pull out the battery in the
direction as shown with arrow.
4
Insert the new date battery into the holder
with the negative end (–) facing up.
5
Replace the date battery holder back into
its original position.
6
Set the date and time when the Date/Time
menu is displayed on the LCD monitor
(Basic Guide p. 2).
(–) Negative end