Detecting Jams - Canon i-SENSYS MF229dw Service Manual

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Technical Overview > Pickup And Feeding System > Detecting Jams > Jam Detection Outline
The pickup and feeding system executes pickup and feeding of papers and is composed of
the main motor, solenoid, and rollers.
In this equipment, pickup from the pickup tray and manual feed tray is available. There is only
a face-down delivery.
Papers set on the pickup tray and manual feed tray are fed by the same pickup roller. The
papers are fed to the photosensitive drum, the transfer charging roller, the fixing sleeve unit,
the pressure roller and then to delivery roller in this order; and then they are delivered to the
delivery tray.
The feeding route of papers has three photointerrupters; the leading edge sensor (PS801),
the fixing delivery sensor (PS701), the paper width sensor (PS702). They detect arrival and
passing of papers.
If a paper does not reach or pass through each sensor within a specified time, the engine
controller judges this status as jam and notices the jam occurrence to the main controller.
PS701: Fixing delivery sensor
PS702: Paper width sensor
PS801: Leading edge sensor
M1: Main motor
SL1: Pickup solenoid
SL2: Duplex Reverse solenoid
2 Technical Overview > Pickup And Feeding System > Detecting Jams > Jam Detection Outline

Detecting Jams

■ Jam Detection Outline
● Overview
The following sensors are installed to detect absence/presence of papers and whether papers
are correctly fed.
• Fixing delivery sensor (PS701)
• Paper width sensor (PS702)
• Leading edge sensor (PS751)
PS702
PS701
PS751
Whether jam occurs or not is judged according to whether a paper is absent/present on the
sensor at the check timing that has been stored in the CPU of the engine controller.
When the engine controller judged that jam has occurred, print operation is stopped and jam
occurrence is noticed to the main controller.
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