HP 1300 Service Manual - Page 69

Jam detection The paper detection sensor (PS931) detects the presence of media in either the priority input tray or the main input tray. The paper top sensor (PS911) and the paper delivery sensor (PS921) detect media moving through the printer. If a jam is detected, the ECU immediately stops the printing process and displays a jam message on the control panel. A jam can be detected under any of the following conditions: z Pickup delay jam-Media does not reach the paper top sensor (PS911) after the pickup solenoid (SL001) has been turned on twice (the original pickup plus a retry) within 2 seconds. z Pickup stationary jam-The paper top sensor (PS911) does not detect the trailing edge of media within 1 second of detecting the leading edge. z Delivery-delay jam-The paper delivery sensor (PS921) does not detect the leading edge of media within 1.5 seconds after the paper top sensor (PS911) detects the leading edge. z Wrapping jam-The paper delivery sensor (PS921) does not detect the trailing edge of the media within 0.1 second after the paper top sensor (PS911) detects the leading edge, and one second has passed after the paper delivery sensor detected the leading edge. z Delivery-stationary jam-The paper delivery sensor (PS921) does not detect the leading edge of media within 1.6 seconds after the paper top sensor (PS911) detects the trailing edge. z Residual paper jam-The paper top sensor (PS911) or the paper delivery sensor (PS921) detect media in the initial rotation period. z Door open jam-The paper top sensor (PS911) or the paper delivery sensor (PS921) detect media while the print cartridge door is open. ENWW Printer functions 69