HP 3380 Service Manual - Page 103
Jam detection,
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Figure 4-10. PS911: Paper-top sensor PS921: Paper-delivery sensor PS931: Paper-detection sensor M1: Main motor SL1: Pickup solenoid Printer paper path 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 a jam message appears on the control-panel display. A jam can be detected under any of the following conditions: ● Pickup delay jam-Media does not reach the paper-top sensor (PS911) after the pickup solenoid (SL1) has been turned on twice (the original pickup plus a retry) within 2 seconds. ● Pickup stationary jam-The paper-top sensor (PS911) does not detect the trailing edge of media within 1 second of detecting the leading edge. ● 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. ENWW Printer functions and operation 87