Canon iPF760 series Service Manual

Also see for iPF750 series: Service manual Service manual

Contents

Chapter 22-49Head management sensorThe photo-transmission-type sensor detects that the printhead is discharging ink.The carriage moves to and stops at the detection positions for individual nozzle arrays. When the carriage is at a stop, nozzles discharge ink on after another.The sensor detects each nozzle due to the voltage change caused when ink discharged from the nozzle blocks the sensor light.Non-discharging nozzle detection is carried out at the following timings:- After the execution of Cleaning 1, Cleaning 2, Cleaning 3, Cleaning 6 or Cleaning 10- After the number of copies that has been set by the user menu choice Nozzle Check Frequency have been printedIf more than a specified number of non-discharging nozzles have been located in one session of non-discharging nozzle detection, the normal cleaning sequence islaunched before a second session of non-discharging nozzle detection is conducted. If more than a specified number of non-discharging nozzles are located in thesecond session of non-discharging nozzle detection, the normal (High) cleaning session is launched before a third session of non-discharging nozzle detection isconducted.If there are at least 320 non-discharging nozzles out of 2560 nozzles as the result of non-discharging nozzle detection, printing is canceled after displaying a messageto replace the head.However, if service mode: [SERVICE MODE] > [SETTING] > [HEAD DOT INF] is [ON], the following message appears.If there are at least 30 nozzles unable to correct the non-discharging state and the number of non-discharging nozzles is less than 100 out of 2,560 nozzles as theresult of non-discharging nozzle detection, printing can continue after displaying a message to check the printing. Also, if the number of non-discharging nozzlesis at least 100 but less than 320 nozzles, printing can continue after displaying a message to check the head. And if there are at least 320 non-discharging nozzles,printing is canceled after displaying a message to replace the head.F-2-43PrintheadNozzle unitHead managementsensor unit