Table 1-22 Jams that the printer detects (continued)
Jam Description
Duplex re-feed jam 1 Media did not reach the registration sensor in time.
Media input stay jam 1 Media remained at the registration sensor longer than legal-sized media should remain.
Fuser delivery delay jam 1 Media did not reach the fuser output sensor in time.
Fuser delivery stay jam 1 Media stayed at fuser output sensor longer than it should stay. Media is in duplex path.
Fuser delivery stay jam 2 Media stayed at fuser output sensor longer than it should stay. Media is in simplex path.
Wrap jam 1 Media is rst detected at fuser output sensor and then disappeared from the sensor before it should
have disappeared.
Door open jam A door is open while paper is moving through the printer.
Residual Media in paper path
jam 1
Media detected in the paper path.
Fuser wrapping jam detection
The printer includes controls for detecting when a jam occurs causing the paper to wrap around the fuser
roller.
Loop control
The loop control stabilizes the paper feed operation before the paper enters the fuser. If the pressure roller
rotates slower than the secondary transfer roller, the paper loop increases and an image defect or paper
crease occurs. If the pressure roller rotates faster than the secondary transfer roller, the paper loop decreases
and a vertical scanning magnication failure occurs because the pressure roller pulls the paper.
To prevent these problems, the loop sensor detects the paper loop before the paper enters the fuser. The DC
controller adjusts the rotational speed of the fuser motor according to the output signals from the loop
sensor and maintains the paper loop. The DC controller slows the fuser motor when the sensor is o and
speeds up the motor when the sensor is on.
62 Chapter 1 Theory of operation ENWW
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