The Canon Service Tool V5103 cannot communicate with your printer under normal operating conditions. You must manually force the printer into before launching the software.
Release both buttons. If the light stays steady green, the printer is in Service Mode. Canon Service Tool V5103 Download
The V5103 version is a later iteration of the service tool and is particularly noted for supporting newer models compared to older versions like V3400 or V3600. It is generally compatible with the following series: The Canon Service Tool V5103 cannot communicate with