Canon BJ-W9000 Service Manual page 204

Part 4: Technical Reference
Suction cap sensor
The photo interrupter-based suction cap sensor detects the status of the suction
caps (1st, 4th, 7th, and 10th caps, from left to right) of the purge unit.
If the sensor light passes through the cut in the rotary flag, which is interlocked with
the suction cap cam shaft, the printer recognizes that all suction caps are open (all
suction caps open state). The other states are determined based on the number of
pulses used for the rotation of the pulse motor, which is calculated using the timing
when the light passes though the cut.
Sensor
All caps are open.
Preventive cap/wiper up/down sensor
The preventive cap/wiper up/down sensor, a photo interrupter-based sensor,
detects the state of the preventive caps (2nd, 3rd, 5th, 6th, 8th, 9th, 11th, and 12th
caps, in the order from left to right) and the state of the wiper unit's position (up or
down).
If the sensor light passes through the cut in the rotary flag, which is interlocked with
the preventive cap/wiper up/down cam shaft, the printer recognizes that all
preventive caps are open and the wiper is down. The other states are determined
based on the number of pulses used for the rotation of the pulse motor, which is
calculated using the timing when the light passes though the cut.
All preventive caps are open
and the wiper unit is down.
Rotary flag
The 1st and 10th
suction caps are in
the state of capping
(close).
Figure 4-40 Suction Cap Sensor Flag
Rotary flag
Sensor
All preventive caps are open
and the wiper unit is up.
Figure 4-41 Preventive Cap/Wiper Up/Down Sensor Flag
All suction caps are
in the state of capping
(close).
All preventive caps are in
the capping position (close)
and the wiper unit is down.
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BJ-W9000
The 4th and 7th
suction caps are in
the state of capping
(close).