Canon 3749B002 On-Screen Manual page 109

Caution
Do not hold the Print Head Holder to stop or move it forcibly. Do not touch the Print Head Holder
until it stops completely.
Important
Do not place any object on the Document Cover. It will fall into the Rear Tray when the
Document Cover is opened and cause the machine to malfunction.
Be sure to lift the Scanning Unit (Cover) with the Document Cover closed.
Do not hold the LCD or the Operation Panel.
Do not touch the metallic parts or other parts inside the machine.
If the Scanning Unit (Cover) is left open for more than 10 minutes, the Print Head Holder moves
to the right. In this case, close and reopen the Scanning Unit (Cover).
Note
The machine may make operating noise when the Print Head Holder moves to the replacement
position.
3.
Remove the ink tank with the lamp flashing fast.
Push the tab (A) and lift the ink tank to remove.
Do not touch the Print Head Lock Lever (B).
Important
Handle the ink tank carefully to avoid staining of clothing or the surrounding area.
Discard the empty ink tank according to the local laws and regulations regarding disposal of
consumables.
Note
Do not remove two or more ink tanks at the same time. Be sure to replace ink tanks one by one