Canon i-SENSYS MF4300dn Service Manual Download

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Chapter 7

7-3

[7] Separation pad
[8] Manual feed tray
[9] Pickup tray
M1: Main motor
SL1: Cassette pickup solenoid
PS801: Leading edge sensor
PS802: Paper width/cartridge detect sensor
PS803: Delivery sensor
PS804: Delivery paper width sensor

7.3 Detection Jams

7.3.1 Jam Detection Outline

7.3.1.1 Overview

0020-2698

i-SENSYS MF4300dn / i-SENSYS MF4350d / i-SENSYS MF4380dn / i-SENSYS MF4310/4318 / i-SENSYS MF4320d / i-SENSYS MF4330d / i-SENSYS
MF4340d / i-SENSYS D450d / i-SENSYS MF4370dn

The machine has the following paper sensors to detect the presence/absence of paper at the time of startup, opening the door, or feeding a paper, as well as to detect
whether a paper is fed normally.

1. Leading edge sensor (PS801)
2. Paper width/cartridge detect sensor (PS802)

3. Delivery sensor (PS803)
4. Delivery paper width sensor (PS804)
In terms of jam, it is judged by whether a paper is at the sensor assembly at the time of the check time memorized in the CPU beforehand. If the CPU judges as the
occurrence of jam, the printing operation is aborted and at the same time, it notifies it to the SCNT PCB.

7.3.2 Delay Jams

7.3.2.1 Pickup Delay Jam

0020-2699

i-SENSYS MF4300dn / i-SENSYS MF4350d / i-SENSYS MF4380dn / i-SENSYS MF4310/4318 / i-SENSYS MF4320d / i-SENSYS MF4330d / i-SENSYS
MF4340d / i-SENSYS D450d / i-SENSYS MF4370dn

In order to prevent the pickup delay jam due to the pickup failure, the machine executes the retry control that performs the pickup operation up to twice.
In the second pickup operation, if the leading edge sensor (PS801) cannot detect the leading edge of paper within about 1.45 sec since the Cassette pickup solenoid
(SL1) turns ON, the DCNT PCB judges as the pickup delay jam.

7.3.2.2 Delivery Delay Jam

0020-2700

i-SENSYS MF4300dn / i-SENSYS MF4350d / i-SENSYS MF4380dn / i-SENSYS MF4310/4318 / i-SENSYS MF4320d / i-SENSYS MF4330d / i-SENSYS
MF4340d / i-SENSYS D450d / i-SENSYS MF4370dn

If the delivery sensor (PS803) cannot detect the leading edge of paper after passing about 1.65 sec from the detection of the leading edge of paper with the leading
edge sensor (PS801), the DCNT PCB judges as the delivery delay jam.

7.3.3 Stationary Jams

7.3.3.1 Pickup Stationary Jam

0020-2701

i-SENSYS MF4300dn / i-SENSYS MF4350d / i-SENSYS MF4380dn / i-SENSYS MF4310/4318 / i-SENSYS MF4320d / i-SENSYS MF4330d / i-SENSYS
MF4340d / i-SENSYS D450d / i-SENSYS MF4370dn

If the trailing edge of paper cannot be detected after passing about 5.4 sec since the leading edge sensor (PS801) detects the leading edge of paper, the DCNT PCB
judges as the pickup stationary jam.

7.3.3.2 Delivery Stationary Jam

0020-2702

i-SENSYS MF4300dn / i-SENSYS MF4350d / i-SENSYS MF4380dn / i-SENSYS MF4310/4318 / i-SENSYS MF4320d / i-SENSYS MF4330d / i-SENSYS
MF4340d / i-SENSYS D450d / i-SENSYS MF4370dn

If the delivery sensor (PS803) cannot detect the leading edge of paper within about 1.48 sec after the leading edge sensor (PS801) detects the trailing edge of paper,
the DCNT PCB judges as the delivery stationary jam.

7.3.4 Other Jams

7.3.4.1 Door Open Jam

0020-2704

i-SENSYS MF4300dn / i-SENSYS MF4350d / i-SENSYS MF4380dn / i-SENSYS MF4310/4318 / i-SENSYS MF4320d / i-SENSYS MF4330d / i-SENSYS
MF4340d / i-SENSYS D450d / i-SENSYS MF4370dn

If the leading edge sensor (PS801) or the delivery sensor (PS803) detects a paper when door open is detected, the DCNT PCB judges as the door open jam.