- HP Laserjet Enterprise CP4020/CP4520 Manual

Jam detection
The product uses the following sensors to detect the paper as it moves through the paper path and to
report to the DC controller if the paper has jammed.
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Fuser delivery sensor (SR5)
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TOP (top of page) sensor (SR20)
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Loop sensor 1 (SR14)
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Loop sensor 2 (SR15)
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Duplex re-pickup sensor (SR22)
Figure 1-45 Jam detection sensors
Duplex model only
SR22
SR20
SR14
SR15
SR5
Duplex media path
Simplex media path
The product determines that a jam has occurred if one of these sensors detects paper at an inappropriate
time. The DC controller stops the print operation and notifies the formatter.
ENWW Jam detection 55