Canon MARK IV User Manual (en)

If there is a problem, first refer to this Troubleshooting Guide on pages 
249 to 255. If this Troubleshooting Guide does not resolve the problem, 
contact your dealer or nearest Canon Service Center.
Do not recharge any battery pack other than a genuine Canon Battery 
Pack LP-E4.
See pages 30 and 31.
The battery is not properly installed in the camera (p.32).
Recharge the battery (p.28).
Make sure the card slot cover is closed (p.36).
If the power is cut off while an image is being recorded to the card, the 
access lamp will still continue to light/blink for a few seconds. When 
the image recording is completed, the power will turn off automatically.
Use a fully-charged battery (p.28).
The battery performance might have degraded. See the [6 Battery 
] menu option to check the battery’s performance level (p.247). If 
the battery’s performance level has degraded, purchase a new battery.
If you keep displaying the shooting function setting screen (p.23) or 
using Live View shooting or movie shooting (p.125, 141) for a 
prolonged period, the number of possible shots will decrease.
Troubleshooting Guide
Power-Related Problems
The battery cannot be recharged with the battery charger provided.
The battery charger’s <CAL/CHARGE> lamp blinks in red.
The charger’s lamp blinks three times.
The camera does not operate even when the power switch is set to <1>.
The access lamp still blinks even when the power switch is set to <2>.
The battery becomes exhausted quickly.