Ink Passage System - Canon WS8400 Service Manual

2.5.2 Ink passage system

Cap sensor
The photo inerrupter-based cap sensor detects the status of the caps on the purge unit.
The sensor determines that the cap is closed when the rotary flag, which operates in conjunction with the cap cam shaft, cuts off the sensor light. The other
states are determined by the number of pulses from the pulse motor based on the timing when the sensor light is cut off.
Pump homeposition sensor
The photo interrupter-based pump sensor detects the homeposition of the suction pump rollers.
The homeposition of the pump is defined as the position where the rotary flag, which operates in conjunction with the drive gear shaft of the rollers, cuts
off the sensor light.
Valve cam sensor
The photo inerrupter-based valve cam sensor detects the status of the valve cam on the ink tank unit.
The sensor determines that the ink supplyer valve is opened when the rotary flag, which operates in conjunction with the valve cam, cuts off the sensor light.
Pump home
position sensor
Sensor
Rotary flag
* Lowering of cap
* Carriage lock
* Opening of air throug
* Capping
valve
* Homeposition
Sensor
Rotary flag
Valve cam sensor
Head management
sensor
Cap sensor
PG position H sensor
F-2-38
h
* Wiping start
F-2-39
* During suction * Homeposition
F-2-40
* Wiper reversal
* Closing of air through
valve
Chapter 2
0008-3881
2-37