| 摘要 |
A mobile device comprising: a processor for outputting print data; a replaceable printhead cartridge including a photosensor and a printhead for printing onto print media; and a light emitting device for receiving the print data and converting it into a modulated light signal; wherein the photosensor and the light emitting device are positioned and orientated such that, in use, the photosensor receives the modulated light signal, the printhead being configured to print on the basis of the print data encoded in the modulated light signal.
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