Canon LBP-2000 Manuel de service télécharger pdf (Page 93)

CHAPTER 2

2 - 54

F. Detecting Jams

1. Outline

The following paper sensor are used to monitor the movement of paper inside the Printer:

• Registration paper sensor (PI101)

• Delivery sensor (PI103)

The presence of a jam is checked at such times as instructed by the program stored in advance in

the CPU in relation to the presence/absence of paper at a specific sensor. When the CPU detects a

jam, it will stop printing operation and communicate the presence of a jam to the video controller.

PI101

PI103

Figure 2-5-10

2 . Pickup jams

a. Pickup delay jam

When the cassette is used as the source of paper, a jam will be identified if the registration paper

sensor (PI101) does not detect the leading edge of paper within a specific period of time after the

start of pickup. Inside the cassette, the cassette pickup roller remains in contact with the paper at

all times; for this reason, pickup retry control will not be executed, but a longer jam detection

margin is used.

When the multifeeder tray is used as the source of paper, pickup retry control will be executed

twice (max.) if the registration paper sensor (PI101) does not detect the leading edge of paper

within a specific period of time after the start of pickup.

If the registration paper sensor (PI101) still does not detect the leading edge of paper, the

condition will be identified as a jam, and a message to this effect will be indicated on the LCD in

the control panel.

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Canon LBP-2000 Manuel de service Page 93