Printer Section; 1Printer Mechanical Section; Printer Mechanical Section; 2Carriage Section - Canon MultiPASS MP390 Service Manual

Chapter 2

2.3 Printer Section

2.3.1 Printer Mechanical Section

The printer's mechanical parts consist of the BJ cartridge section, carriage section, purge section, and paper feed
section. Each part is explained below.
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2.3.2 Carriage Section

The carriage secures the printhead including 2 ink tanks in place.
The carriage belt driven by the carriage motor (DC motor) moves the carriage horizontally back and forth across the
paper.
Regarding the carriage's position control, the initial position is detected when the carriage goes against the right wall
which is the home position. After that, the carriage position is detected by reading the pulse from the encoder film.
The paper spacing position is read from the carriage position when the carriage goes against the left wall.

2.3.3 Purge Section

The purge section, driven by a dedicated purge motor, consists of the wiper, pump, cap and carriage lock.
The wiper maintains the head face surface to ensure high-quality printing. The ink suction feature enables the ink to
be readily ejected from the nozzles.
When the BJ cartridge is not in use, the nozzles are protected by caps, and the carriage is locked in place.
The motor's running direction controls the ink suction operation or capping/wiping/valve open/closing operation.
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