The iR2016’s power supply unit (PSU) must deliver stable 3.3V and 5V DC to the controller. Ripple or undervoltage can cause boot failures. The printer detects this instability and parks itself in Download Standby instead of attempting a full boot, which could result in data corruption.
The Canon iR2016 is sensitive to power fluctuations. A brownout or a spike can corrupt the boot sector of the firmware. Upon reboot, the machine finds a checksum mismatch and defaults to "Download Standby" mode as a safety precaution. canon ir2016 download standby error verified
Do not panic. In many cases, this error can be resolved without replacing hardware. Follow these steps in order. The iR2016’s power supply unit (PSU) must deliver stable 3