Brother 4000CN - Manual (Page 169)

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9.
Remove the tray cover from the rear of
the printer.
10.
Push up button ‘A’ (1) and fully open
the front cover (2).
11.
Push the button as shown and open
the paper outlet cover.
12.
Grip the handle on top of the print head
cartridge and gently lift it out of the
printer.
1. Transfer roll
Look
Do not touch the transfer roll.
Hold the print head cartridge by its
handle to prevent the cartridge from
falling.