Canon EOS 5D Mark IV L-series Zoom Lens Kit Owner's Manual

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Troubleshooting Guide
556
 
Auto power off is in effect. If you do not want auto power off to 
take effect, set [52: Auto power off] to [Disable] (p.76).
 
Even if [52: Auto power off] is set to [Disable], the LCD monitor 
will still turn off after the camera is left idle for approx. 30 min. (The 
camera’s power does not turn off.)
 
The camera cannot be used with EF-S or EF-M lenses (p.55).
 
Install a recharged battery in the camera (p.42).
 
Make sure the card is properly inserted (p.45).
 
If you are using an SD card, slide the card’s write-protect switch to 
the Write/Erase setting (p.45).
 
If the card is full, replace the card or delete unnecessary images 
to make space (p.45, 439).
 
If you try to focus in the One-Shot AF mode and the focus 
indicator <o> in the viewfinder blinks, or when the AF point is 
orange during Live View/movie shooting, a picture cannot be 
taken. Press the shutter button halfway again to refocus 
automatically, or focus manually (p.58, 159).
The camera turns off by itself.
Shooting-Related Problems
The lens cannot be attached.
The viewfinder is dark.
No images can be shot or recorded.