Head-Maintenance Function And Structure - Canon BJC-55 Service Bulletin

Part 4: Technical Reference

3.2.4 Head-maintenance function and structure

a) Cleaning function
Cleaning operation is performed to correct the print quality problem, which is
caused by none-ejection of ink, and to prevent the print defects resulting from
improper ink ejection from the BJ cartridge head nozzles.
Cleaning operation includes purging, wiping, capping, and maintenance jet. The
cleaning time varies according to the type of BJ cartridge installed and the printer
status.
The printer carries out cleaning in the following cases:
Printer turned on by
POWER button
BJ cartridge replaced or ink cartridge replaced
RESUME button pressed
The cleaning operation is performed in the purge section. The cap, cylinder, and pump
are operated by the gears and cams, which are driven by the paper-feed motor. (See Part
4: 3.3 Purge Section Structure. (page 4-28) )
Figure 4-19 Purge Section
TABLE 4-3 CLEANING INK CONSUMPTION
Printer Status
1) First time use of BJ
cartridge
2) Less than 72 hours from
last cleaning
3) More than 72 hours from
last cleaning
1) Cleaning
2) Head refreshing
4-26
Carriage
Wiping Hooks
Cap
Wiper
Pump
Approx. Ink Consumption (g)
BC-10
0.36
0.12
0.24
0.24
0.12
0.24
BJC-50
BC-11e
0.52
0.18
0.26
0.52
0.26
0.52