Canon BJC-50 - Manual (Page 71)

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DO NOT TOUCH THE INTERIOR OF THE CARTRIDGE HOLDER, THE BASE OF THE
PRINTHEAD UNIT,THE PRINTHEAD,THE FILM CABLE, OR THE INK CARTRIDGE
FILTERS WHEN CHANGING THE INK CARTRIDGE.
When replacing an ink cartridge, remove only the empty ink cartridge and leave the print
head unit in the cartridge holder to avoid soiling your hands.
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