Canon LBP-2000, Service Manual

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CHAPTER 2
2 - 58
b . Delivery assembly stationary jam
A delivery trailing edge delivery jam or a delivery stationary jam is identified by the DC controller
as a delivery assembly stationary jam.
When the CPU on the DC controller PCB detects a jam, it will stop printing operation and
indicates the fact to the video controller.
• Delivery Trailing Edge Delay Jam
The delivery sensor (PI103) does not detect the absence of paper within a specific period of time
after the registration paper sensor goes off.
• Delivery Sensor (PI103) Stationary Jam
When printing is started from standby, the delivery sensor (PI103) does not detect the absence of
paper with a specific period of time after it detects the leading edge of paper.
• Sequence for a Delivery Trailing Edge Delay Jam
Main motor
(M101)
Delivery sensor
(PI103)
Registration paper
sensor (PI101)
PRINT
Delivery sensor
jam check Normal
Error
Jam message ON
Figure 2-5-18
• Sequence for a Delivery Stationery Jam
Main motor
(M101)
Deliver sensor
(PI103)
PRINT
Delivery sensor
jam check
Normal
Error
Jam message ON
Figure 2-5-19
4 . Other jams
a . Residual jam
If the delivery sensor (PI103) detects the presence of paper within 1.4 sec after the start of initial
rotation (INTR), or if the registration sensor (PI102) detects the presence of paper at the start of
initial rotation (INTR), the DC controller will identify the condition as a residual jam.
When the CPU on the DC controller PCB detects a jam, it will stop printing operation and
indicate the presence of a jam to the video controller.
b . Front cover open jam
If the front cover is opened while paper is in the paper path, the DC controller will identify the
condition as a front cover open jam.
When the CPU on the DC controller PCB identifies a jam, it will stop the printing operation and
indicate the presence of a jam to the video controller.