HP M5025 Service Manual - Page 161
Jam detection, Paper loop SR4
UPC - 882780575493
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Jam detection This device includes the following sensors for detecting paper: ● Delivery tray paper full (SR1) ● Paper loop (SR4) ● Top-of-page (SR5) ● Fixing delivery (SR6) ● Delivery (SR7) ● Pre-feed (SR14) The CPU determines whether or not a paper jam exists by checking if paper is present at the sensor at the specified timing. The specified timing is stored in the CPU memory. If the CPU determines that a jam has occurred, it stops the device operation and notifies the formatter. Jam type Pickup delay Pickup stationary Fuser delivery delay Fuser stationary Fuser wrapping Door open Residual paper Description Specified timing (approximate) The device performs retry control to retrieve the pickup delay jam caused T = 1.5 s (upper by the pickup sensor. cassette) When SR5 does not detect the media leading edge within the specified timing, the CPU executes the pickup operation twice under both cassette pickup and Tray 1 pickup operations. If SR5 still does not detect the media leading edge, the CPU notifies the formatter of a pickup delay jam. T = 2.8 s (lower cassette) T = 1.1 s When SR5 continues detecting paper for the specified timing after the paper T = 0.4 s is originally detected, the CPU notifies the formatter of a pickup stationary jam. When SR6 does not detect paper within the specified timing after SR5 T = 1.5 s detects paper, the CPU notifies the formatter of a fuser delivery delay jam. When SR6 does not detect the media trailing edge within the specified T = 2.3 s timing after the SR5 detects the media leading edge, the CPU notifies the formatter of a fuser stationary jam. When SR6 does not detect paper within the specified timing after it originally T = 0.7 s detects paper, the CPU notifies the formatter of a fuser wrapping jam. The CPU determines the door open jam when the cartridge door, face-up N/A bin, or cassette is detected as open. The CPU notifies the formatter of a residual paper jam when any of the following sensors detect paper when the device is turned on, when the door is closed, or when automatic delivery is completed. ● SR4 ● SR5 ● SR6 ● SR7 ● SR14 ENWW Print engine 131