Loop Control; Figure 1-35 Loop Control - HP LASERJET ENTERPRISE M725dn Troubleshooting Manual

Loop control

The product controls the loop of paper to prevent print-quality and paper-feed defects.
If the fuser film/pressure roller rotates slower than the photosensitive drum/transfer roller, the
●
paper loop increases.
If the fuser film/pressure roller rotates faster than the photosensitive drum/transfer roller, the paper
●
loop decreases.
The DC controller detects the loop amount by monitoring the loop sensor and controls the rotational
speed of the fuser motor.
Figure 1-35
Fuser film/Pressure roller rotates slower than photosensitive drum/transfer roller.
Fuser film/Pressure roller rotates faster than photosensitive drum/transfer roller.
48 Chapter 1 Theory of operation
Loop control
M3 Fuser motor
Fuser film
Pressure roller
DC controller
Drum motor M1
Paper
Loop sensor lever
SR6
Loop sensor
Photosensitive
drum
Transfer roller
ENWW