| 摘要 |
Bidirectional normal printing operations are executed wherein forward feeding sub-scan and back feeding sub-scan are alternately carried out between the outward pass and return pass of main scanning. In addition, for each round-trip pass of normal printing operations, determination is made as to whether each nozzle is an operational nozzle, capable of jetting ink droplets, or a non-operational nozzle, incapable of jetting ink droplets, by detection of whether ink droplets are jetted from each nozzle. When a non-operational nozzle is present, supplementary operations are executed wherein dots to have been printed by the non-operational nozzle are printed using another, operational nozzle in a round-trip pass.
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