HP Color LaserJet 9500 Service Manual - Page 73

Figure 34. ENWW Paper-path and jam detection ● Flipper-The flipper assembly receives the media from the printer or MFP. When it receives a delivery notice from printer or MFP, the flipper motor starts to move at the print or copy speed. When the ENTRY sensor is activated, the sheet is measured. If the sheet goes to the face-up bin, the FACEUP sensor is deactivated to signal the end of the paper-handling function and the sheet is ejected immediately. If the sheet goes to a face-down bin, the entry sensor is deactivated, which indicates that the motor should stop and then reverse to flip the sheet face-down. The flipper motor stops when the FACEUP sensor is deactivated in either case: when the sheet is flipped or when it is ejected to the face-up bin. ● Eject-On the eject assembly, the belt starts moving when it receives a sheet-arriving message. The belt then moves the sheet down to the elevator head and, when the sheet reaches the EXIT1 sensor, the eject motor starts. When the trailing edge of the sheet leaves sensor EXIT1, only the eject assembly handles the sheet. The motor stops immediately after the sheet is ejected, when the sheet is no longer touching the EXIT2 sensor. Note that the flipper ejects the sheet if the destination is the face-up bin. ● Elevator-The elevator assembly does not directly move paper. Instead, it places the elevator head in front of the bins for paper delivery, as determined by the operating mode and the bin status. The following illustration shows the paper path: Left output bin Flipper assembly Delivery head motor Blind cover Bin 1 Input paper guide Home position Standard output bins Bin 8 Controller PCA 8-bin mailbox paper path Delivery head line Metal tape Delivery head assembly Eject rollers Metal tape Paper Magnetic strip Transport belt Transport belt motor Chapter 5 Theory of operation 71