Users need to open service door to access printzone for paper jam clearance or cartridge replacement. In some
printers, opto sensor or hall sensor is equipped to detect door open. When user opens door, door sensor
status changes and it triggers carriage to move to the center for user to replace cartridge. On the other hand,
when user opens door during printing, printer immediately stops printing upon sensing door open for safety
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INC, HP, "PRINTER SERVICE DOOR OPEN DETECTION USING SCANNER", Technical Disclosure Commons, (December 10, 2021)