Owner's Manual

Troubleshooting Guide
If a problem occurs with the transmitter, first refer to this troubleshooting guide. If this
troubleshooting guide does not resolve the problem, contact your dealer or nearest Canon
Service Center.
Normal shooting
The power does not turn on.
Insert the mounting foot in the camera's multi-function shoe until it clicks into place, then
slide the mounting foot lock lever to the right to secure the unit to the camera ( ).
Clean the transmitter and camera contacts if they are dirty.
The power turns off by itself.
The transmitter's auto power off has been activated ( ). Either wake the camera or
press the < > button on the ST-E10.
The camera's battery life does not last long.
The ST-E10 consumes camera battery power even if the camera's power-saving or auto
power off functions have been activated. Turn off the ST-E10 when possible if you are
not using it.
Receiver units do not fire.
Make sure receiver units support wireless flash photography using radio transmission.
Set the transmission channels and wireless radio IDs of the sender unit and receiver
units to the same number ( ).
Make sure receiver units are within transmission range of the sender unit ( ).
Receiver units sometimes fail to fire or unexpectedly fire at full output.
Position the receiver units at a location with the clearest possible view of the sender unit.
Make sure receivers are facing the sender unit.
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