Canon imagePROGRAF W6200, Service Manual, Page: 135 / 311

3.5 Purge Unit
3.5.1 Functions of purge unit
To maintain high print quality, the purge unit performs maintenance of the nozzles in
the printhead.
The functions of the purge unit include capping, cleaning, and ink supply.
a) Capping
Capping prevents nozzle drying and dust adhesion by pressing the cap of the purge
unit to the face plate on the nozzle section of the printhead.
Capping is performed when printing is completed, at the start of the suction
operation, and when switching to the standby state due to an error.
The capping operation also connects the ink passage between the printhead and
purge unit.
b) Cleaning
Cleaning includes a wiping operation for removing paper fibers and dried ink
deposits adhering to the nozzle face plates of the printhead, a suction operation for
removing ink from the nozzles and drawing new ink to refresh the nozzles, and a
maintenance jet operation where ink is sprayed from the nozzles to the cap or
maintenance jet tray to remove bubbles in the nozzles and dust and other foreign
particles near the nozzles. The combination of these three maintenance operations
improves nozzle discharge performance.
Details of the cleaning function are shown in the table below.
Printer status Cleaning description Ink consumption
*1
At installation Initial refilling s Cleaning C Approx. 30 g
Power has been turned on after a Cleaning C Approx. 10 g
predefined amount of ink has been
discharged since the last cleaning C or
initial refilling suction
Power has been turned on after at
Cleaning C Approx. 10 g
least 720 hours (but not more than
2160 hours) has elapsed since the last
cleaning C or initial refilling suction.
*2
Power has been turned on after at least Cleaning D Approx. 30 g
2160 hours has elapsed since the last
cleaning C or initial refilling suction.
*2
Before printing when less than Approx. 0.008 g
48 hours has elapsed since the last Maintenance jet
printing was completed
Before printing when between
Approx. 0.016 g
48 hours and 168 hours has elapsed Maintenance jet
since the last printing was completed
Before printing when more than
Cleaning A Approx. 1 g
168 hours has elapsed since the last
printing was completed
Scan period during printing
Maintenance jet 5 discharges per nozzle
After printing is completed when a Approx. 0.008 g
predefined amount of ink has been Maintenance jet
discharged since the last wiping *3
After printhead replacement Cleaning C Approx. 10 g
Part 4: Technical Reference
W6200
4-26