HP LaserJet 9040/9050 Service Manual - Page 104

Jam detection The printer detects jams according to the following conditions: z Pickup 1 delay jam. Media does not reach the tray 2 feed sensor A (PS1402) or the tray 3 feed sensor A (PS1404) within 3.2 seconds after pickup begins. z Pickup 2 delay jam. • Media does not reach the tray 2 feed sensor B (PS1401) or the tray 3 feed sensor B (PS1403) within 3.0 seconds after the tray 2 feed sensor A (PS1402) or the tray 3 feed sensor A (PS1404) detects the leading edge of the media. • Media does not reach the registration paper sensor (PS2) within 4.0 seconds after the tray 2 feed sensor B (PS1401) detected the leading edge of the media, or within 4.5 seconds after the tray 3 feed sensor B (PS1403) detected the leading edge of the media. z Fuser delivery 1 delay jam. The leading edge of the media does not reach the fuser delivery sensor (PS502) within 1.4 seconds after the /VSYNC signal. z Fuser delivery 2 delay jam. The leading edge of the media does not reach the fuser jam sensor (PS501) within 1.6 seconds after the /VSYNC signal. z Fuser delivery stationary jam. The trailing edge of the media does not clear the fuser delivery sensor (PS502) within a specified time (3.4 seconds for A3 media, 2.5 seconds for A4 media) after the /VSYNC signal. z Face-down delivery delay jam. The leading edge of the media does not reach the face-down bin delivery sensor (PS1451) within 2.4 seconds after the /VSYNC signal. z Face-down delivery stationary jam. The leading edge of the media does not clear the facedown bin delivery sensor (PS1451) within a specified time (4.3 seconds for A3 media, 3.4 seconds for A4 media) after the /VSYNC signal. z Door open jam. The following sensors can detect media when the door is opened or closed: • Registration paper sensor (PS2) • Fuser delivery sensor (PS501) • Fuser jam sensor (PS502) • Tray 2 feed sensor B (PS1401) • Tray 2 feed sensor A (PS1402) • Tray 3 feed sensor B (PS1403) • Tray 3 feed sensor A (PS1404) • Face-down bin delivery sensor (PS1451) z Residual jam. The following conditions determine a residual jam: • The fuser delivery sensor (PS502) and the fuser jam sensor (PS501) detect media when the printer is turned on. • Three minutes have passed since a jam that should contain an automatic delivery command was cleared, but the CPU on the DC controller PCA did not receive the automatic delivery command. • A jam was cleared, jammed media was automatically delivered, the printer is on, and the fuser roller reached its target temperature, but at least one of the following sensors detects media: • Registration paper sensor (PS2) • Fuser delivery sensor (PS501) • Fuser jam sensor (PS502) • Tray 2 feed sensor B (PS1401) • Tray 3 feed sensor B (PS1403) • Face-down bin delivery sensor (PS1451) 88 Chapter 5 Theory of operation