HP LaserJet M9040/M9050 Service Manual - Page 393
Skew, Copy-image defects, ADF back side duplex, second side
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Skew Use the following information to gauge skew specifications. ● 2 mm over 260 mm (simplex and duplex) ● Leading edge plus or minus 2.5 mm (cut sheet media) ● Plus or minus 4.5 mm (envelopes) ● Left margin plus or minus 2.5 mm (cut sheet) Copy-image defects The first step in isolating a possible copy-image defect is to eliminate the print engine as the cause. Print several pages from a remote computer. Use print images that show the defect. If the defect appears on the printed pages, the problem might be with the print engine. If the image defect does not appear on the printed pages, isolate the defect to a scan location or to the source of the copies. An image defect can be caused in the following scan locations: ● ADF front side (simplex) ● ADF back side (duplex, second side) ● Flatbed glass ● All of the above scan locations Use the corresponding tables in this section to determine the type of defect (for example, blank pages or vertical lines) and then to identify the component that is likely the cause. Defect Blank page Cause Solution Defective ADF inverter PCA. Replace the ADF optical assembly. Defective ADF analog processor PCA. Replace the ADF optical assembly. Defective ADF scanning lamp. Replace the ADF optical assembly. Defective ADF CCD driver. Replace the ADF optical assembly. ENWW Image-formation troubleshooting 375
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