Canon DR-2580C Service Manual page 36

CHAPTER 2 FUNCTION & OPERATION
3. Feed Error Detection
There are three types of document sen-
sors in this machine: a document board
sensor and two registration sensors.
The document board sensor detects
whether or not a document is present in the
document pickup
pre-registration and registration sensors de-
tect it in the registration roller section.
The pre-registration and registration
sensors detect a document feed error.
1) Delay jam (document pickup error)
When the registration sensors do not
detect the leading edge of the document,
even after the motor drives the specified
length.
2) Residual jam
When the registration sensors do not
detect the trailing edge of the document
after the leading edge of the document is
detected, although the motor drives the
specified length (about 365 mm).
3) Early start jam
When the registration sensors detect the
trailing edge of the document after the
leading edge of the document is detected
before the motor drives the specified
length (about 40 mm).
4) Non-removable jam
When the registration sensors detect the
presence of the document when the
power is ON or after the upper unit opens
and closes.
5) Double feed detection
This machine checks the double feed by
detecting the document length by the
registration sensors.
process is the same as the above the
residual jam. The specified length is
determined by the user set document
size.
2-10
opening, and the
The detection
COPYRIGHT © 2005 CANON ELECTRONICS INC.
4. Mechanical Feed Mode
Feed status can be checked without the
computer in this mode. This mode should not
be open to users.
The mechanical feed mode can be acti-
vated by pressing the job buttons on the op-
eration panel, as follows:
i) Turn ON the power switch with the job
button No.1 pressed.
ii) Keep pressing the job button No.1. For
about one second later, the power in-
dicator blinks. Then, press the job
button No.2 immediately.
iii) Press off the both buttons. When it is
in the mechanical feed mode, the
power indicator keeps blinking.
Set the document and push the job but-
ton No.1. The document will begin feeding.
The feeding speed is the same as for the
black and white setting of 200 dpi. To cancel,
turn the power switch OFF.
CANON DR-2580C FIRST EDITION APR. 2005