HP Color LaserJet Enterprise CP4020 Service Manual - Page 88

Table 1-16 Jams that the product detects Jam Description Pickup delay jam The TOP sensor does not detect the leading edge of the paper within a specified time (including two retries) after the pickup operation from the cassette, multipurpose tray, or optional paper feeder starts. Pickup stationary jam The TOP sensor does not detect the trailing edge of the paper within a specified time from when it detects the leading edge. Fuser delivery delay jam The fuser delivery sensor does not detect the leading edge of the paper within a specified period after the TOP sensor detects the leading edge. Fuser delivery stationary jam The fuser delivery sensor does not detect the trailing edge of the paper within a specified period after it detects the leading edge. Wrapping jam After detecting the leading edge of the paper, the fuser delivery sensor detects the absence of paper, and it has not yet detected the trailing edge. Residual paper jam One of the following sensors detects paper presence during the initialization sequence: ● Fuser delivery sensor ● Loop sensor 1 ● Loop sensor 2 One of the following sensors detects paper presence during the an automatic delivery operation: ● Fuser delivery sensor ● TOP sensor ● Loop sensor 1 ● Loop sensor 2 ● Duplex re-pickup sensor Door open jam A door is open while paper is moving through the product. Duplexing re-pickup jam 1 The duplex re-pickup sensor does not detect the leading edge of the paper within a specified period after the media reverse operation starts in the duplex reverse unit. Duplexing re-pickup jam 2 The TOP sensor does not detect the leading edge of the paper within a specified period after the paper is re-picked. Automatic delivery: The product automatically clears paper if the TOP sensor detects residual paper during initialization. 56 Chapter 1 Theory of operation ENWW