HP M5025 Service Manual - Page 173
Lift-up operation
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Lift-up operation For stability, the lift-up operation maintains the position of the surface of the paper stack at the specified height. The HCI driver PCA rotates the lifter motor (M2) and raises the lifting plate in which the paper stack is loaded. The PCA monitors the paper-stack surface sensor (SR1) when the device is turned on when the HCI cassette is installed, and during print operations. The lift-up operations for the 3 x 500-sheet HCI center and bottom cassettes are the same as for the top. The lift-up operation performs the following functions: ● Initial lift-up ● Lift-up during printing The initial lift-up is performed when the cassette is installed and the paper stack surface stays in the bottom. Under the following conditions, the HCI driver PCA continues driving M1 to lift the stack surface to the pickup position until SR1 detects the paper-stack surface: ● SR1 detects no paper when the device is turned on. ● SR1 detects no paper when the HCI cassette is installed. The HCI driver PCA recognizes that the paper is overloaded and stops the initial lift-up operation if SR1 detects the paper-stack surface when the cassette is installed. The lift-up during printing is performed when paper consumption indicates that the stack level is reduced to a specified level. The HCI driver PCA drives M1 when SR1 detects no paper during a print operation and lifts the stack surface to the pickup position. The CPU recognizes that the lift-up failed when SR1 does not detect the paper-stack surface even though the lift-up operation is performed for 8 seconds during a print operation. ENWW 1 x 500-sheet and 3 x 500-sheet high-capacity input feeder 143
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