What is the correct procedure for turning off the main power before servicing the MF1643iF II?
First, turn OFF the main power switch of the host machine, then wait until all blinking on the Control Panel disappears before disconnecting the power plug. Warning: disconnecting the power plug without turning OFF the main power first may cause damage to the machine, and performing work without disconnecting the power plug may cause electrical shock. (Page 7)
From the official Canon MF1643IF Ii Printer manual, page 7
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