Lexmark C950 Service Manual - Page 387

5058-030 • A sheet of media of less than 11 inches is stacked in the stacker media bin with the Staple Mode changed. Top view of finisher tray Rear staple Previous Front staple Next Go Back • An operator put a sheet (or sheets) when no media is remaining in the stacker media bin. (The size and condition of media stacked in the tray are not identified.) • Media was present in the stacker media bin when power was turned on. (The size and condition of media stacked in the tray are not identified.) • The finisher entered the Sleep Mode with mix stacking and then has exited the Sleep Mode. • The post-processing mode has changed. Functions of stacker media bin sensors/motors • Sensor (stacker bin level 1) - A light emitter and photo-receiver paired together to detect the height of media in the stacker media bin. - This sensor is used to control the elevator motor. - When blocked by media or the tray, this sensor turns high, deciding that the stacker media bin is above the reference level. - To the contrary, when receiving light, this sensor turns low, deciding that the stacker media bin is below the reference level. - The high to low turning point of the sensor is defined as the reference level. • Sensor (stacker bin level 2) - A light emitter and photo-receiver paired together to detect the height of media in the stacker media bin (same function as sensor (stacker bin level 1)). - This sensor is also used to control the elevator motor. - When blocked by media or the tray, this sensor turns high, deciding that the stacker media bin is above the reference level. - To the contrary, when receiving light, this sensor turns low, deciding that the stacker media bin is below the reference level. • Sensor (stacker bin no media) - A photo-interrupter sensor that detects that the stacker media bin is at the highest position; it also detects no media. - When the actuator attached to the carriage assembly right enters the sensing area, the emitted light is blocked, which turns the sensor to high (+5 V). • Sensor (stacker bin upper limit) - A photo-interrupter sensor that detects the stacker media bin's abnormal elevation above the top position (sensor (stacker bin no media) position). - When the actuator attached to the carriage assembly right enters the sensing area, the emitted light is blocked, which turns the sensor to high (+5 V). • Sensor (stacker bin level encoder) - A photo-interrupter sensor that counts the pulse of the Encoder attached to the Shaft-Elevator. - The media volume in the stacker media bin is detected based on this count. • Stacker bin lift motor - A DC motor that elevates or lowers the stacker media bin. - Clockwise rotation elevates the tray, and counterclockwise rotation lowers the tray. • Media eject motor assembly - A stepper motor that ejects stapled or non-stapled media to the stacker media bin. - Clockwise rotation ejects media to the stacker media bin, and counterclockwise rotation reverses the eject roll to feed the media from the punch to the compiler unit assembly. Diagnostic aids 3-99