Canon LBP-2000, Service Manual

Page: 95 / 222

CHAPTER 2
2 - 56
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
s e n s o r.
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 paper
sensor (PI101)
Registration
clutch (CL102)
STBY INTR PRINT
2nd sheet picked up
Registration paper
sensor jam check
Normal
Error
Jam message ON
/PRNT signal IN
Figure 2-5-13
• Sequence for a Registration Sensor Pickup Stationary Jam (last sheet)
Normal
Main motor
(M101)
Registration paper
sensor (PI101)
Registration
clutch (CL102)
PRINT LSTR
Registration paper
sensor jam check
Normal
Figure 2-5-14
Error
Main motor
(M101)
Registration paper
sensor (PI101)
Registration clutch
(CL102)
PRINT
Registration paper
sensor jam check
Error
Jam message ON
Figure 2-5-15