The Deskjet F4288 All-in-One printer (in common with many (although not all) inkjet printers) uses a Page Description Language (printer language) referred to as PCL3 GUI.
This (and the similar PCL3 Enhanced) language is proprietary to HP; as such, detailed specifications of the language are not generally available.
However, it is known that these languages are raster-based: the printer driver converts all objects (text, images, etc.) in the source document on the workstation into the equivalent encapsulated PCL-format raster images (but using a proprietary compression method).
The printer just unencapsulates and uncompresses these images, and prints the resultant dots.
So any problem with printing the wrong characters is not a problem with the printer itself, but due to limitations, or faults, within the printer driver and/or its interaction with the source application and/or operating system routines.
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