About The Purge Unit; The Capping And Cleaning Functions Of The Purge Unit - Canon BJC-3000 Service Manual

Part 5: Appendix

1.2 About the Purge Unit

The purge unit maintains the nozzles of the BJ cartridge in order to maintain printing
quality.
The purge unit's functions can be divided into capping, cleaning, and paper feed motor
drive switching functions.

1.2.1 The capping and cleaning functions of the purge unit

The purge unit's cap is pressed against the face of the print head to prevent the ink
from drying out and to avoid particles adhering to it.
Capping is performed in the following situations:
· When power is turned off with the POWER button.
· When the printer is at standby, uncapped, and print data is not received for a
certain period of time:
During paper-feed:
Other than during paper-feed: after 30 seconds
· After the front cover is opened for 10 minutes.
The cleaning function includes the following operations:
· suction operations:
· maintenance jet operations:
· wiping operations:
Cleaning operations are performed in the following situations so that the head
maintains high-quality printing.
TABLE 5-1 INK CONSUMPTION AMOUNT DURING CLEANING (REFERENCE)
With a Black BJ Cartridge
When powered on the first time after AC power is connected (capped)
When powered on the first time after AC power is connected (uncapped)
When the dot count exceeds the specified amount
When the power is turned on after more than 72 hours since the last cleaning
When cleaning is executed by button operation
At BJ cartridge replacement
At ink tank replacement
When cleaning is executed by the printer driver
When head-refreshing is executed by the printer driver
When the printer is unpacked (initial power on)
Before printing on banner paper
(when the dot count or time exceeds the specified amount since the last cleaning)
With a Color/Photo BJ Cartridge
When powered on the first time after AC power is connected (capped)
When powered on the first time after AC power is connected (uncapped)
When the dot count exceeds the specified amount
When the power is turned on after more than 72 hours since the last cleaning
When cleaning is executed by button operation
At BJ cartridge replacement
At ink tank replacement
When cleaning is executed by the printer driver
When head-refreshing is executed by the printer driver
When the printer is unpacked (initial power on)
Before printing on banner paper
(when the dot count or time exceeds the specified amount since the last cleaning)
after 20 minutes
the suction of ink from the print head to refresh the
nozzles with fresh ink.
to remove bubbles within, and dust around the
nozzles, ink is ejected onto the cap and into the
maintenance jet receiving section.
paper fibers and ink residue is wiped from the print
head's face.
5-4
BJC-3000
Approx. Ink Consumption
Approx. 0.16g
Approx. 0.32g
Approx. 0.16g
Approx. 0.16g
Approx. 0.16g
Approx. 0.32g
Approx. 0.32g
Approx. 0.16g
Approx. 0.32g
Approx. 0.48g
Approx. 0.16g
Approx. Ink Consumption
Approx. 0.46g
Approx. 0.84g
Approx. 0.46g
Approx. 0.46g
Approx. 0.46g
Approx. 0.84g
Approx. 0.84g
Approx. 0.46g
Approx. 0.84g
Approx. 1.22g
Approx. 0.46g