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Part 4: Technical Reference
3.3 Purge Unit
3.3.1 Purge unit functions
1) Capping function
The purge unit's cap is pressed against the print head face plate of the BJ cartridge
to prevent the nozzles from drying or ink from leaking.
When the printer is standing by for print data with the cap open, the BJ cartridge is
capped if data is not received within a preset time. The BJ cartridge is also capped
when the printer is turned OFF by pressing the POWER button.
2) Cleaning function
Cleaning is executed to maintain the print quality of the print head according to the
conditions listed in "Part 4: TABLE 4-7 CLEANING EXECUTION CONDITIONS,
CLEANING TIME AND INK SUCTION AMOUNTS" (page 4-25) .
Cleaning combines wiping, suction, and maintenance jet operations. Wiping
involves wiping paper fiber, coagulated ink residue, ink optimizer, and ink from the
print head face plate. Suction involves sucking out ink from the BJ cartridge and
refilling the inside of the nozzles with fresh ink. Maintenance jet operation removes
increased viscosity ink, air bubbles, mixed color ink, and dirt from inside the nozzles
to prevent uneven printing caused by clogged nozzles.
Ink Sensor Unit
Carriage Lock Pin
Maintenance Jet Absorber
Cleaning/Capping Cap
When Black BJ cartridge BC-80 is installed:
Cleaning/capping cap
When Photo BJ cartridge BC-82 Photo is installed:
Capping cap
Cap Unit A
Purge Motor
Figure 4-22 Purge Unit
Wiper Section
Capping Cap
Wiper Cleaner Section
Cap Unit B
4-24
BJC-8500
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