Canon imageRUNNER ADVANCE 4551i Service Manual page 72

● Jam Detection
This equipment detects original jams using the sensors indicated in the diagram. The check timing to detect jam is already stored
in the ROM of the Reader Controller PCB, which determines the occurrence of a jam by the presence of an original in the areas
of corresponding sensors.
When a jam occurs, the machine stores the information by the code.
This machine's jam code can be checked by printing out a jam error history report from service mode.
PS_R2 UN_BO8
PS_A6
ADF Driver PCB
PS_A1
ADF Driver PCB
PS_R2
UN_BO7 PS_A1 PS_R1
PS_A7
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2. Technology