Canon LBP-2000 Service Manual page 95

CHAPTER 2
b. Stationary jam
A jam will be detected if the registration paper sensor (PI101) detects the absence of paper (trailing
edge of the previous sheet) by the time the leading edge of paper reaches the registration paper
sensor.
In the case of the last sheet when printing a single page or in continuous mode, if the registra-
tion paper sensor (PI101) does not detect the trailing edge of paper within a specific period of time
after the registration clutch (CL102) is turned on, the CPU will identify the condition as a jam; it
will then stop printing operation and indicate the presence of a jam to the video controller.
• Sequence for a Registration Stationary Jam
Main motor
(M101)
Registration
clutch (CL102)
Registration paper
sensor jam check
Registration paper
sensor (PI101)
• Sequence for a Registration Sensor Pickup Stationary Jam (last sheet)
Normal
Main motor
(M101)
Registration
clutch (CL102)
Registration paper
sensor jam check
Registration paper
sensor (PI101)
Error
Main motor
(M101)
Registration clutch
(CL102)
Registration paper
sensor jam check
Registration paper
sensor (PI101)
2 - 56
/PRNT signal IN
2nd sheet picked up
STBY INTR PRINT
Normal
Figure 2-5-13
PRINT
Figure 2-5-14
PRINT
Figure 2-5-15
Jam message ON
Error
LSTR
Normal
Jam message ON
Error