Purge Unit Functions - Canon BJC-820 Service Manual

BJC-8200

1.3 Purge Unit Functions

The purge unit, using the built-in purge motor, carries out the following operations:
head-capping, head-wiping, ink-suction, and ASF-driving. The purge unit switches over
the drive for these operations by reversing the direction of motor rotation, and also by
using the drive selector lever.
If the purge motor rotates in the forward direction while the carriage is at the capping
position, head-capping and head-wiping are carried out. In this case, the wiper moves
in the direction in which nozzles are placed. If the purge motor rotates in the reverse
direction while the head is capped, ink-suction is carried out. For the suction
operation, a pump with a tube is used.
To drive the ASF, the carriage moves to the left, passing the capping position and
rotates the purge motor in the reverse direction.
TABLE 5-1 AMOUNTS OF INK USED DURING CLEANING (GUIDE)
Cleaning conditions
When power is turned on for the first time after the AC plug is
When power is turned on for the first time after the AC plug is
The number of dots printed has exceeded the predefined value.
When power is turned on or printing is started after 120 hours
When cleaning is started by the RESUME button.
When the BJ cartridge is replaced (including when the printer
When an ink tank is replaced
When left at the cartridge replacement position for more than
When cover is closed after being open for more than
When cleaning is carried out from the printer driver
When head refreshing is carried out from the printer driver.
Before printing is made on banner paper.
* The ink amount is the sum of the amounts of each color ink.
Cap
Figure 5-3 Purge Unit
connected (capped)
connected (uncapped)
or more from the previous cleaning.
is used for the first time.)
(Ink sensor detects No Ink -> Ink Found)
20 minutes or power is turned off.
5 seconds without carrying out any operation.
or from the main unit.
(After more than 30 minutes have passed from
the last cleaning or a pre-determined number
of dots have been printed)
Wiper
Purge Motor
Drive Selector Lever
5-3
Part 5: REFERENCE
Amount of ink used
for reference
Approx. 0.56 cc
Approx. 1.30 cc
Approx. 0.56 cc
Approx. 0.56 cc
Approx. 0.74 cc
Approx. 1.30 cc
Approx. 0.74 cc
Approx. 0.74 cc
Approx. 0.74 cc
Approx. 0.74 cc
Approx. 1.30 cc
Approx. 0.56 cc