Canon BJ-W3000 Service Manual page 104

The purge unit is composed of the units below.
No. Name
[1] Wiper
[2] Remaining ink sensor (PS3)
[3] Ink tank sensor (PS4)
[4] Caps
[5] Home position sensor (PS2)
[6] Purge motor (M3)
[7] Pump home position sensor (PS1)
[8] Pump roller
[9] Waste ink carriage tube
[10] Wiper solenoid (SL1)
[11] Waste ink absorber unit
* Refer to "II. Carriage unit" for details of these sensors.
Lifts up when the carriage returns and wipes ink off the head
surfaces (C, M, Y, Bk).
*
Detects ink remaining in the ink tank.
*
Detects presence of ink tank.
Press against the heads when capping and purging. The caps
are connected to the carriage tube to carry the purged waste
ink into the tube.
*
Detects the capping position of the carriage.
Rotates the pump roller.
Detects the pump roller capping position.
Generates suction by squeezing the ink carriage tube.
Carries waste ink to the waste ink absorber unit.
Raises the wiper.
Connected to the waste ink carriage tube. Accumulates waste
ink.
Table 2-401
CHAPTER 2. BASIC OPERATION
Function
2–47