Service manual

Chapter 10
10-4
10.3 Detection Jams
10.3.1 Outline
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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.
10.3.2 Types of Jams
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The machine identifies a jam as one of 6 types. When a jam has occurred, be sure to remove 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 does not detect the trailing edge of paper
within a specific period of time.
c. Original Size Error
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. Original 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 ADF (copyboard cover) open/close sensor (PS2) detects a condition indicating
that the ADF is open.