Carriage Unit; Carriage Functions - Canon WS8400 Service Manual

Table of Contents

position, and the internal pressure of the ink tank is opened so that the internal pressure is maintained at a fixed level.

d) Notches for preventing incorrect installation

The ink tanks have notches for preventing incorrect installation. The wrong ink tanks cannot be inserted and set because of these notches.

The ink tank lever can be lowered only when the ink tank has been installed in the set position, and the ink supply will not start unless the ink tank lever

is lowered.

e) Ink supply valve

The ink supply valve is located between the ink tank and ink tube. This valve presents ink leakage from occurring when the ink tube on the ink tank side

is opened during replacement of the ink tank.

An ink supply valve has two kinds, all colors [1] and a black [2].

The ink supply valve is opened and closed by the valve cam [4], which turns based on the power of the valve motor [3]. A separate ink supply valve is

provided for black ink to allow the ink tank to be changed between Black and Matte Black.

2.3.2.3 Carriage Unit

2.3.2.3.1 Carriage functions

a) Printhead mounting

The carriage mechanically locks the printhead and connects them to the terminals on the head relay PCB.

b) Control

A carriage relay PCB and encoder are installed on the carriage. The carriage relay PCB communicates the drive signal of the printhead, and the encoder

detects the carriage position and generates print timing signals. The carriage relay PCB is connected to the engine controller by flexible cable.

c) Carriage drive

The carriage belt moves the carriage back and forth on the platen. The carriage belt is driven by the power from the carriage motor.

d) Printhead maintenance

This printer has a cleaning function that performs wiping and suction of the printhead when the carriage is stopped at the carriage homeposition.

e) Media thickness adjustment

Air passage

Ink port

Ink tank

Notches for preventing

incorrect installation

EEPROM