Canon iPF700, Руководство по обслуживанию

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Chapter 2
2-10
unit.
d) Ink supply while printing
The ink supply valves are kept open while printing, so that inks are being constantly fed to the printhead under
the negative pressure of the nozzle assembly caused by discharging inks.
Further, waste inks sucked in a cleaning operation and inks from borderless printing flow into the waste ink
absorber under the maintenance cartridge or purge unit and into the waste ink box.
When an ink tube filled with ink, opening all whole ink passages (by opening both the ink supply valve and the
printhead fixer lever with an ink tank yet to be installed) could cause the ink in the ink tube to flow backward
due to a head difference, leaking through the hollow needle in the ink tank.
As a precaution, never open all the ink passages at the same time while the ink tubes are filled with inks.
e) Agitating the ink in an ink tank
To prevent the pigment ink stored in a tank from settling, the ink needs to be agitated.
The ink supply valve is continuously opened and closed to cause the ink to flow back into the tank for agitation.
Each ink tank contains an agitating plate to aid in agitating of the ink. (An agitating plate is also installed in the
dye ink tank.)
-Operation timing: Whenever a new tank is installed or 168 hours have expired since the agitation was last
carried out (agitation is carried out regardless of whether printing or cleaning is in progress).
-Ink supply valve open/closed: 30 times (30 seconds)
If 336 hours or more have elapsed, the ink supply valve open/closed count and the time to the next session of
agitation are varied according to the elapsed time.
2.3.2.2 Ink Tank Unit
2.3.2.2.1 Structure of Ink Tank Unit
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a) Ink tanks
Each color-specific ink tank is filled with 130 mL of ink (90 mL for the starter ink tanks bundled with the
printer). The ink level in each ink tank is memorized in EEPROM attached to the tank and is detected as a dot
count on the basis of the EEPROM information.
When an electrode attached to a hollow needle detects no continuity, it displays a message reporting that the ink
tank is nearly empty. If the dot count reaches a predesigned value in this state, an ink out condition is assumed.
b) Ink port
Depressing the ink tank fixer lever on the printer would cause would cause a hollow needle to pierce the ink port
sealed by a rubber plug, linking the ink passage of the ink tank to the printer.
c) Air passage
Depressing the ink tank fixer lever on the printer would cause an open hollow needle to pierce the air passage
sealed by a rubber plug, releasing the internal pressure of the ink tank to keep it constant.
d) Notches for preventing incorrect installation
Ink tanks are furnished with a notch for preventing incorrect installation. If the installation of an ink tank in
incorrect position is attempted, the notch would interfere with it, preventing its installation.
The ink tank fixer lever won't lower without the ink tank fully inserted to reach the mounting position, so the
ink cannot be supplied.