Detecting An Original Jam - Canon SmartBase PC1200s Service Manual

CHAPTER 4 OPERATION

9.3 Detecting an Original Jam

9.3.1 Outline
The ADF is equipped with 2 sensors to detect original jams. The CPU on the host
machine's image processor PCB checks the presence of paper over the sensor at such times
as stored in advance; if it identifies a jam, it turns off the ADF motor (M3) and indicates a
jam message on the LCD.
9.3.2 Types of Jams
The machine identifies a jam as one of 6 types. When a jam has occurred, be sure to re-
move it, open and then close the ADF, place the original once again, and start over.
a. Registration Sensor Delay Jam
After separation is started, the registration sensor (PS7) does not detect the leading edge
of paper within a specific period of time.
b. Registration Sensor Stationary Jam
After the registration sensor (PS7) detects the leading edge of paper, it detects the trailing
edge of paper before a specific period of time.
d. Original Delivery Sensor Delay Jam
After the registration sensor (PS7) detects the leading edge of paper, the original delivery
sensor (PS8) does not detect the leading edge of paper within a specific period of time.
e. Delivery Sensor Stationary Jam
After the registration sensor (PS7) detects the trailing edge of paper, the original delivery
sensor (PS8) does not detect the trailing edge of paper within a specific period of time.
f. ADF Open Jam
While an original is being moved, the host machine's ADF (copyboard cover) open/close
sensor (PS2) detects a condition indicating that the ADF is open.
PS2 (for jam f)
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COPYRIGHT © 2001 CANON INC.
PS7 (for jam a, b, or c)
F04-903-01
2000 2000 2000 2000 CANON SmartBase PC1200s/iR1200s REV. 0 DEC. 2001
PS8 (for jam a, d, or e)