Modular print engine unit

The modular print engine unit as claimed in 8, wherein the interface comprises:

• a plurality of mechanical interfaces to locate the set of printhead modules accurately;
• a plurality of fluid interfaces to feed the set of printhead modules with printing fluid;
• and
• a plurality of electrical interfaces to feed the set of printhead modules with power and data.

A modular print engine unit comprising:

• multiple printhead modules, each printhead module comprising multiple printing dies, and each printing die comprising multiple nozzles;
• a printing fluid supply system to teed, in use, printing fluid to the printhead modules;
• and
• a print alignment module operable, in use, to align the multiple printhead modules relative to a media being printed;
• and
• wherein the modular print engine unit comprises:
• an error detection module operable, in use, to detect proper operation of the multiple nozzles;
• or
• a service sub-system operable, in use, to service the multiple nozzles,
• wherein the modular print engine unit is independently operable relative to another modular print engine within a media-wide array printer.

A media wide array printer comprising:

• a plurality of modular print engine units arranged in series along a media advance direction, wherein each modular print engine comprises:
• multiple printhead modules, each printhead module comprising multiple printing dies, and each printing die comprising multiple nozzles;
• a printing fluid supply system to feed, in use, printing fluid to the multiple printhead modules;
• a print alignment module operable, in use, to align the multiple printhead modules;
• an error detection module operable, in use, to detect an operating status of the multiple nozzles;
• and
• a service sub-system operable, in use, to service the multiple nozzles,
• wherein the modular print engine unit is independently operable relative to another modular print engine within the media-wide array printer.