Canon EOS 90D Advanced User's Manual page 596

Troubleshooting Guide
The access lamp still lights or blinks even when the power
switch is set to < 2 >.
If the power is turned off while an image is being recorded to the card, the
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access lamp will remain on or continue to blink for a few seconds. When
the image recording is complete, the power will turn off automatically.
[Does this battery/do these batteries display the Canon logo?] is
displayed.
Do not use any battery other than genuine Canon Battery Pack LP-E6N/
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LP-E6.
Remove and install the battery again ( = 47).
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If the electrical contacts are dirty, use a soft cloth to clean them.
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The battery becomes exhausted quickly.
Use a fully charged battery ( = 44).
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The battery performance may have degraded. See [ 5 : Battery info.] to
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check the battery's recharge performance level ( = 524). If the battery
performance is poor, replace the battery with a new one.
The number of possible shots will decrease with any of the following
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operations:
Pressing the shutter button halfway for a prolonged period.
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Activating the AF frequently without taking a picture.
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Using the lens's Image Stabilizer.
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Using the screen frequently.
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Continuing Live View shooting or movie recording for a prolonged period.
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Using the wireless communication functions.
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The camera turns off by itself.
Auto power off is in eff ect. To deactivate auto power off , set [ 5 : Auto
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power off ] to [Disable] ( = 513).
Even if [ 5 : Auto power off ] is set to [Disable], the screen will still turn
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off after the camera is left idle for approx. 30 min. (The camera's power
does not turn off .)
The camera does not work with AA/R6 batteries in the battery grip.
Reinstalling the battery magazine and restarting the camera may restore

camera operation.
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