This article also applies to the PIXMA MX439.
Make sure that the power is turned on, open the front cover (C), then open the paper output tray (D).
![](/library/attachments/embedded/3536_image_1.jpg)
Open the paper output cover (E).
When the FINE cartridge holder moves to the replacement position, the head cover (F) OPENS AUTOMATICALLY.
![](/library/attachments/embedded/3536_image_2.jpg)
- The serial number is located on a label on the flat metal piece inside the machine just above the paper feed area. See photo below. The serial number consists of four letters followed by five digits.
*Document cover (scanner cover) is open in this photo. It is not necessary to open this to see the serial number