Pentax Optio T20 - Manual (Page 143)

Using the AC Adapter
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The optional AC adapter kit K-AC7 is recommended when the camera will
be used with AV or PC equipment and will be on for long periods of time.
1
Make sure that the camera is turned off before opening
the DC input terminal cover.
2
Connect the DC terminal of the AC adapter to the DC
input terminal on the camera.
3
Connect the AC plug cord to the AC adapter.
4
Plug the AC plug cord into a power outlet.
Using the AC Adapter
4
AC adapter
AC plug cord DC terminal
2
3
1