- HP Laserjet Enterprise CP4020/CP4520 Manual

Paper feeder jam detection
The 1 x 500-sheet paper feeder uses the tray 3 paper presence sensor (SR4) to detect the presence of
paper and to check whether paper has jammed.
Figure 1-51 Jam detection (1 x 500-sheet paper feeder)
SR4
The 1 x 500-sheet paper feeder detects the following jams:
●
1 x 500-sheet PD pickup delay jam: Tray 3 feed sensor does not detect the leading edge of paper
within a specified time (including two retries) after the pickup operation starts.
●
1 x 500-sheet PD pickup stationary jam: Tray 3 feed sensor does not detect the trailing edge of
paper within a specified time after the sensor detects the leading edge.
●
1 x 500-sheet PD residual paper jam: Tray 3 feed sensor detects the presence of paper for a
specified time during an automatic delivery operation.
The 3 x 500-sheet paper feeder uses the following sensors to detect the presence of paper and to check
whether paper has jammed.
●
Tray 3 paper presence sensor (SR4)
●
Tray 4 feed sensor (SR7)
●
Tray 5 feed sensor (SR10)
64 Chapter 1 Theory of operation ENWW