Service manual

Chapter 7
7-2
7.2 Detecting Jams
7.2.1 Jam Detection Outline
7.2.1.1 Outline 0006-4102
The machine is equipped with 6 sensors used to detect jams.
The presence/absence of paper is checked with reference to the state of each sensor at such times as stored in the CPU
on the DC controller PCB. When the machine detects a jam, it will turn off the main motor (M1) and will indicate a
jam message on the LCD.
7.2.1.2 Types of Jams 0006-4103
The machine groups jams into 8 types. When a jam occurs, be sure to remove it, and start over the operation.
7.2.2 Delivery Jams
7.2.2.1 Pickup Delay Jam 0006-4105
After execution of a pickup retry, the paper leading edge sensor (PS102) does not detect the leading edge of paper
within a specific period of time, or no paper exists at time of a pickup retry.
7.2.2.2 Delivery Sensor Leading Edge Delay Jam 0006-4111
After the paper leading edge sensor (PS102) has detected the leading edge of paper, the delivery sensor (PS3) does
not detect the trailing edge of paper within a specific period of time.
7.2.2.3 Delivery Sensor Trailing Edge Delay Jam 0006-4115
After the delivery sensor (PS3) has detected the leading edge of paper, the delivery sensor (PS3) does not detect the
trailing edge of paper within a specific period of time.
7.2.3 Stationary Jams
7.2.3.1 Paper Leading Edge Sensor Stationary Jam 0006-4108
After the paper leading edge sensor (PS102) has detected the leading edge of paper, the paper leading edge sensor
(PS102) does not detect the trailing edge of paper within a specific period of time.
7.2.3.2 Delivery Sensor Stationary Jam 0006-4116
- As part of operation after a pickup delay jam, the delivery sensor (PS3) detects the trailing edge of paper; however,
the delivery sensor (PS3) once again detects the trailing edge of paper, the laser is forced OFF, and a specific
period of time passes.