Purge Unit; Purge Unit Functions - Canon BJC-1000 Service Manual

BJC-1000

3.3 Purge Unit

3.3.1 Purge unit functions

1) Capping function
The purge unit's cap is pressed against the face of the print head to prevent the ink
from drying out or leaking.
If print data is not received for 60 seconds or more during a printing operation, the
purge unit wipes the printing head face. If print data is still not received for another
60 seconds, the purge unit caps the printing head.
Other than during a printing operation, if print data is not received after a certain
period of time (varies between 5 to 20 seconds), the purge unit caps the print head.
2) Cleaning function
The cleaning operation includes the wiping of paper and ink residue that has
adhered to the printing head's face plate. It also sucks out ink from the printing
head to replenish the inside of the nozzles with fresh ink.
The amount of ink consumed by the cleaning operation is as follows.
Black BJ Cartridge installed : 0.12 g
Color BJ Cartridge or Photo BJ Cartridge installed : 0.21 g
To maintain high printing quality, the purge unit cleans the printing head at the
following times:
• After the AC power cord is connected.
• After the BJ cartridge is replaced.
• Before the printing operation is performed and it has been 72 hours since the last
time the head was cleaned.
• When the printed dot count exceeds the set value.
• When the RESUME button is pressed down for 2 seconds or more.
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Part 4: Technical Reference