HP 2500 Service Manual - Page 70
Jam detection - paper jam
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Jam detection The registration sensor (PS711) and the fusing paper sensor (PS1) detect media moving through the printer. If a jam is detected, the dc controller immediately stops the printing process and sends a message to the video controller circuit. A jam can be detected under any of the following conditions: Pickup delay jam. The leading edge of the paper does not reach the registration sensor (PS711) within 1.1 seconds (tray 1), 1.7 seconds (optional tray 2), or 2.8 seconds (optional tray 3). Pickup stationary jam. The registration clutch is on, and the registration sensor (PS711) does not detect the trailing edge of the paper within 3.4 seconds after the start of a re-pickup operation. Delivery delay jam. The registration clutch is on, and the fusing-delivery paper sensor (PS1) does not detect the leading edge of the paper within 2.3 seconds after the start of a repickup operation. Delivery stationary jam. The leading edge of paper does not pass the fusing-delivery paper sensor (PS1) within 2.4 seconds after it has passed the registration sensor (PS711). Door open jam. The main CPU detects that the top cover is open during a print operation. Residual paper jam. The main CPU detects one or more of the following conditions: • Power is turned on. • The printer is returning from sleep mode. • The printer door is closed after a jam occurrence. • The registration sensor (PS711) and fusing-delivery sensor (PS1) detect paper. 68 Theory of operation C9706-90926