Paper Jam Detection - Canon LBP 2460 - B/W Laser Printer Service Manual

D. Paper Jam Detection
The following paper sensors are provided to detect whether paper is present and whether the
paper is fed normally.
• Registration paper sensor (PS1)
• Pick-up unit paper sensor (PS2)
• Fixing unit delivery sensor (PS1403)
• Face-down tray delivery sensor (PS1402)
The microprocessor (CPU) determines whether paper is jammed by checking whether paper is
present or absent at the sensors, at times stored in memory.
If the CPU determines that a jam has occurred, it stops print operation and notifies the jam to
the video controller.
Note: T1, T2, and T3 times indicate the minimum and maximum sizes of paper.
1. Cassette pick-up delay jam
The CPU detects a cassette pick-up delay jam has occurred if the paper does not reach the pick-
up unit paper sensor (PS2) within the prescribed time after the paper has been picked up.
Cassette pick-up solenoid (SL1)
Jam check
Pick-up unit paper sensor (PS2)
Main motor
/PRNT
(Unit: Seconds)
INTR PRINT
2.5
Normal
Figure 2-5-12
CHAPTER 2
/PRNT
(Unit: Seconds)
INTR PRINT
2.5
Abnormal
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