Epson Stylus Pro 7400, Service Manual

Page: 164 / 428

EPSON Stylus Pro 7400/7800/9400/9800 Revision B
Operating Principles Print Mechanism Components 164
Figure 2-15. Cleaning Mechanism Components
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Cap assembly
When not printing, the print head (should) rest on the cap assembly to ensure that
the nozzles don't clog. Also, the print head is in the capped position during ink
charging, cleaning, and so on.
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Flushing box
Flushing (dummy printing) is performed over the flushing box, and the flushed ink
flows through the tube to the waste ink pads.
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CR Lock Mechanism
If the carriage moves from the printable area to beyond the capping (CR_HOME)
position to the right, the carriage moving prevention lock is engaged.
The CR lock mechanism uses the cutter solenoid in common. When the cutter
solenoid goes ON in the capping position, the CR lock is released.
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Maintenance Tank (Waste ink absorber)
NOTE: The Ink System Terms used in the above text are explained in the
following table.
Cap Assembly
CR Lock
Table 2-7. Explanation of Operation
Operation Explanation
Carriage (CR) Lock • This is the carriage stop position when the power is Off.
• The time when the carriage is in the standby position (home position)
with the power ON and with no paper loaded and no print data to
print.
Ink Initial Filling • This is the operation where the head is filled with ink for the first
time.
When the first ink cartridge is inserted (after all 4 cartridges (Stylus
Pro 7400/9400) or all 8 sets of two cartridges (Stylus Pro 7800/9800)
have been inserted), the ink initial filling operation is performed
automatically (some operation should be performed manually).
• The initial filling flag is set when the printer is shipped from the
factory, then after this operation, the initial filling flag is reset. The
initial filling flag is also set after executing “Head Rank Input”.
Flushing • In order to prevent the viscosity of the ink inside the head nozzles
from increasing, the ink inside the flushing box is flushed out.
• Flushing is done when paper is set, when printing from the standby
state, during continuous printing, during paper Eject, during paper
cutting, etc.
Empty Suction
Operation • After ink is sucked up, the remaining ink inside the cap is sucked up
and the ink adhering to the head nozzle surface is removed.
• Through flushing, etc., the ink that has accumulated in the cap is
sucked up and discharged.
Wiping Operation The carriage is moved from right to left along the rubber side of the
wiper (the right half of the wiper plate) incorporated in the pump unit so
that the head surface is rubbed with the rubber of the wiper.
Purpose:
• After ink suction, removes the ink and other substances adhering to
the head surface.
• Ensures close contact of the cap.
Capping In order to prevent the ink viscosity from increasing while it is being
kept, a rubber cap is placed over the print head nozzles when entering a
shutdown operation.