Canon imagePRESS 1135 Series Service Manual page 142

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Technology > Pickup / Feed System > Pick-up Area Control/Function > Lifter Error Detection Control
■ Lifter Error Detection Control
When the lifter is moved up or down, 3 types of abnormal detection are executed as shown
below.
The deck in which abnormal state is detected cannot be used due to alarm.
● Upper limit detection
In the case that the ascending lifter cannot be stopped due to the failure of the paper surface
sensor etc., the compartment or the air pickup assembly may be broken.
In order to prevent excess upward movement of the lifter, the lifter upper limit sensor detects
the upper limit of the lifter position.
● Lower limit detection
In the case that the descending lifter cannot be stopped due to the failure of the paper surface
sensor etc., the compartment may be broken.
In order to prevent excess downward movement of the lifter, the lifter lower limit switch
detects the lower limit of the lifter position.
● Foreign matter detection
In the case that a small-size paper has been set on the deck and the lifter goes up with
foreign matters or papers remained in the space, these foreign matters may reach the upper
limit before the paper surface sensor detects the paper. When this happens the compartment
will be damaged as the lifter continues to move upwards.
The foreign particle sensor detects foreign matter by contact of foreign matter with the foreign
particle sensor flag to control the lifter from moving up.
2 Technology > Pickup / Feed System > Pick-up Area Control/Function > Lifter Error Detection Control
Foreign particle sensor
Lifter upper limit sensor
Foreign particle sensor flag
Lifter
Lifter lower limit switch
2-94
PCB36
Air pickup
driver PCB
PCB37
Deck driver
PCB
F-2-123
2-94