Detecting Jams; Jam Detection Outline; Delay Jam; Delivery Delay Jam - Canon L100 Service Manual

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Technical Overview > Pickup Feed System > Detecting Jams > Delay Jam

Detecting Jams

■ Jam Detection Outline

● Overview
The following sensors are installed to detect absence/presence of papers and whether papers
are correctly fed.
• Fixing Delivery Sensor (PS701)
• Paper Width Sensor (PS702)
• Paper Leading Edge Sensor (PS751)
PS702
PS701
PS751
Whether jam occurs or not is judged according to whether a paper is absent/present on the
sensor at the check timing that has been stored in the CPU of the engine controller.
When the engine controller judged that jam has occurred, print operation is stopped and jam
occurrence is noticed to the main controller.
NOTE:
Jam detection timing may differ for 400 dpi and 600 dpi printing. In such a case, setting
values applicable to 600 dpi printing are indicated in parentheses following those for
400 dpi printing.
2 Technical Overview > Pickup Feed System > Detecting Jams > Delay Jam

■ Delay Jam

● Delivery Delay Jam
There are 3 cases of delivery delay jam detection.
A. No preceding sheet
B. Preceding sheet exists 1 – short paper interval with the preceding sheet
C. Preceding sheet exists 2 – long paper interval with the preceding sheet
A. No preceding sheet
Paper Leading Edge
Sensor (PS751)
Fixing Delivery
Sensor (PS701)
When the Fixing Delivery Sensor (PS701) cannot detect presence of paper within 1490 (2234)
msec. after the Paper Leading Edge Sensor (PS751) detects the paper, it is judged as a

delivery delay jam.

NOTE:
The above 1490 (2235) msec value accounts for the 126.26 mm distance from the
Paper Leading Edge Sensor (PS751) to the Fixing Delivery Sensor (PS701), plus 40
mm margin. Since the distance from the fixing nip to the Fixing Delivery Sensor (PS701)
is 22.9 mm, the length of wrapping from the leading edge is 62.9 mm. Since one lap
of the fixing film is 18.2 pi (57.2) mm, the wrapping is longer than one lap. However,
F-2-27
allowing for paper arch, sensor accuracy and heavy paper feeding capability, etc., the
value cannot be further reduced.
OFF
ON
OFF
ON
1490(2235)msec
Paper Detection Period
Jam
2-26
F-2-28
2-26