Canon MultiPASS C50 Service Manual page 92

Part 1: Facsimile
Names and functions of parts
1. Home Position Sensor (HPS)
This sensor detects the home position edge and carriage position. Also, at the capping position, the on/off
of purge sensor flag during the pump operation is detected.
2. Carriage Motor
This is a stepping/pulse type motor, which is controlled with pulse width modulation. It moves the
carriage by belt drive.
3. BJ Cartridge
4. Carriage
Driven by the carriage motor, the carriage moves horizontally across the paper. Through the carriage
ribbon cable, the printing signals from the logic board are transmitted to the BJ cartridge in the carriage.
By controlling the purge unit's slide lock pin, the carriage controls the engagement of the paper feed
motor's drive power between the paper feed/purge unit and the sheet feeder.
5. Paper thickness adjustment lever
Adjust the gap between the print head and paper according to the thickness of the paper.
6. Purge unit
In order to maintain the BJ cartridge's high print quality, the BJ cartridge's nozzles and spray orifices are
cleaned by a wiper and pump. When in standby mode, the BJ cartridge's spray orifice section is covered
by a rubber cap to prevent the nozzles from drying out and ink from leaking.
The purge unit controls the swing gear. This gear switches power from the paper feed motor for
separation of the paper, paper feed and nozzle cleaning.
7. Ink Detection Sensor
Ink is ejected directly over the optical axis of a pass-type photosensor, which detects the change in light
intensity to determine whether or not ink is being ejected.
8. Waste ink absorbers
Absorb waste ink from cleaning or ink empty detection.
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