HP M5025 Service Manual - Page 177

HCI jam detection The following sensors are provided for HCI jam detection: ● HCI paper-feed sensors (SR3, SR4, and SR9) ● Top-of-page sensor (SR5 in the print engine) The HCI performs retry control to retrieve the pickup delay jam that the pickup error caused. Jam type Pickup delay jam 1 Pickup delay jam 2 Pickup delay jam 3 Description Specified timing (approximate) When SR5 does not detect the media leading edge within the specified timing after the SR3 detects the media leading edge, the CPU determines the pickup delay jam 1. T = 3 s When SR3 does not detect the media leading edge within the specified timing after SR4 or SR9 detect the media leading edge, the CPU determines a pickup delay jam 2 for the center and bottom cassettes. T = 1.5 s (center cassette) T = 3.0 s (bottom cassette) When SR4 or SR9 do not detect the media leading edge within the specified timing from when the pickup operation began, the HCI retries the pickup operations for the center or bottom cassette twice. T = 1.5 s When SR4 and SR9 still have not detected the media leading edge after the retries and after another specified timing, the CPU determines a pickup delay jam 3. Automatic delivery is available if SR3, SR4, or SR9 detects paper before starting a print operation. ENWW 1 x 500-sheet and 3 x 500-sheet high-capacity input feeder 147