Canon W6400 Series, Service Manual

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Chapter 2
2-11
F-2-9
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.
The ink supply valve is opened and closed by the valve cam, which turns based on the power of the valve motor. A separate ink supply valve is provided
for black ink to allow the ink tank to be changed between Black and Matte Black.
F-2-10
2.3.2.3 Carriage Unit
2.3.2.3.1 Carriage functions
0008-6342
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) Nozzle check
This printer detects non-discharging printhead with the head management sensor attached to the maintenance jet tray by discharging ink while the carriage
is stopped at the maintenance jet ray.
f) Media thickness adjustment
The gap between the bottom face of the printhead and the media surface can be adjusted according to the media thickness. Although the print quality is
higher when the gap is narrow, ink blots may form on the print surface due to contact of the media with the printhead face, or the printhead nozzles may
be damaged. In this printer, the user can use the printhead height adjustment lever to select the gap width according to the media thickness (3 positions).
g) Paper width/skew detection
Ink tank
Notches for preventing
incorrect installation
Air passage Ink port
EEPROM
Notches for preventing
incorrect installation
Valve motor
Valve cam
Ink supply valve (Bk)
Ink supply valve
(All color)