Multiple monochromatic print cartridge printing system

An inkjet printing system, comprising:

• a plurality of print head cartridges, each extending across a direction of print media propagation and spaced apart along the direction of print media propagation, each print head cartridge having a respective inkjet printhead;
• a print head chassis for supporting the plurality of print head cartridges;
• a lift mechanism for, lifting and lowering the print head chassis between a printing position, a transition position, and a maintenance position;
• a maintenance chassis supporting a chassis sub-frame having a corresponding plurality of maintenance cradles mounted thereon, each maintenance cradle maintaining a respective printhead, the chassis sub-frame being slidably movable relative to the maintenance chassis;
• a retraction mechanism for laterally sliding the maintenance chassis between a storage position in which the maintenance cradles are laterally displaced from the print head cartridges and an operational position in which each maintenance cradle is positioned opposite its respective print head cartridge;
• a sub-frame movement mechanism for slidably moving the chassis sub-frame relative to the maintenance chassis;
• and
• a platen on which the print media is supported and propagated, wherein
• each maintenance cradle comprises a capper and a wiper for maintaining a respective printhead;
• and
• wherein, in the operational position, the sub-frame movement mechanism is configured to slidably move the chassis sub-frame relative to the maintenance chassis so as to align each capper or each wiper with its respective printhead.