Brother HL-4200CN Service Manual page 52

6) Take the new print head cartridge out of its package and pull on the longer of the
paired seals horizontally toward you. Verify that there is a circle on the leading edge
of the tape that you pull out. Do this for another three.
Note:
If there is no circle on the leading edge of the tape, you cannot use this print head
cartridge.
Keep the polystyrene packing, aluminum bag and box of the print head cartridge if
a future move of the printer is anticipated.
7) Remove the tape from the top of the cartridge (1), hold the protective cover on both
sides and remove it from the print head cartridge (2).
8) Grip the handle on top of the print head cartridge and face the flat part towards the
back of the printer.
Check for a circle on the leading end of the tape
Fig.2-21
Fig.2-22
Flat side faces the rear
Fig.2-23
II-9