Canon Arizona 6100 XTHF Mark II Series User Manual page 173

How to Change a UV Lamp Bulb
How to Remove the Lamp Bulb
It is not necessary to shut the printer power off the while replacing the UV lamp bulbs. However,
make sure you turn them off by de-selecting the lamp icon in the user interface before you start
and allow a few minutes for the bulbs to cool down.
Chapter 9 - Printer Maintenance 173