Canon EOS 80D - Manual (Page 483)

483
Troubleshooting Guide
 The camera cannot be used with EF-M lenses (p.47).
 Install a recharged battery in the camera (p.34).
 Make sure if the card is properly inserted (p.37).
 Slide the card’s write-protect switch to the write/erase position (p.37).
 If the card is full, replace the card or delete unnecessary images to
make space (p.37, 378).
 If you try to focus in the One-Shot AF mode and the focus indicator
<o> in the viewfinder blinks, a picture cannot be taken. Press the
shutter button halfway again to refocus automatically, or focus
manually (p.50, 137).
 If a card error message is displayed, see page 39 or 496.
 Set the AF operation to One-Shot AF. Focus lock is not possible in the
AI Servo AF mode or when servo takes effect in AI Focus AF mode
(p.118).
Shooting-Related Problems
The lens cannot be attached.
The viewfinder is dark.
No images can be shot or recorded.
The card cannot be used.
I cannot lock the focus and recompose the shot.