Canon 1692B002 Service Manual - Page 64
Pump encoder, Valve open/closed detection sensor, Agitation cam sensor, Ink detection sensor, Head
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Chapter 2 Rotary flag Sensor - Carriage lock - Capping - Suction - Air passage valve open - Idle suction - Printing - Suction during printing - Wiping - Carriage lock - Air passage - Carriage move - Maintenance jet - Idle suction F-2-26 Pump encoder The photointerrupter-based sensor reads slits in the encoder film of the Purge motor and controls the amount of its rotaion accordingly. Slits Sensor F-2-27 Valve open/closed detection sensor The 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 sensor The 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 sensor The 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 supply side is disrupted, causing the sensor to detect that the ink is out. Ink tank Wall Rubber plug Needle (ink supply) Needle(air passage) F-2-28 Head management sensor The phototransmitter-based head management sensor detects the status of ink discharge from the printhead. The carriage iteratively moves and stops at the detection position for each nozzle train, discharging inks nozzle by nozzle while it is halted. The sensor detects discharging nozzles from the voltage changes produced by the drops of an ink discharged from one nozzle at a time shielding the sensor light. 2-22