Canon iPF800 Series Service Manual

Also see for imagePROGRAF iPF810: Brochure Troubleshooting guide Brochure & specs User manual

Contents

Chapter 22-48Pump encoder sensor/HP maintenance jet pump encoder sensorThe photointerrupter-based sensor reads slits in the encoder film of the Purge motor/HP maintenance jet pump motor and controls the amount of its rotaion accord-ingly.F-2-40Valve open/closed detection sensorThe photointerrupter-based valve open/closed detection sensor detects the status of the valve.The sensor detects that the ink supply valve is open when the sensor light is shielded by a flag linked with the valve cam.Agitation cam sensorThe photointerrupter-based agitation cam sensor detects the status of the agitation cam.The sensor detects the agitation cam home position when the sensor light allows it to be transmitted.Ink detection sensorThe ink detection sensor detects the presence or absence of the ink in an ink tank with respect to the status of continuity between two hollow needles.When the ink level in the tank falls to a point below the wall surrounding the hollow needles in the air passage, continuity with the hollow needle on the ink supplyside is disrupted, causing the sensor to detect that the ink is out.F-2-41Head 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 30 or more non-discharging nozzles and less than 100 non-discharging nozzles per train are located as a result of the third session of non-discharging nozzledetection, the print operation can resume after the message display as needed. If 100 or more non-discharging nozzles are located, a head replacement promptmessage is displayed.F-2-42SensorSlitsInk tankWallRubber plugNeedle(air passage)Needle (ink supply)PrintheadNozzle unitHead managementsensor unit