HP LaserJet M9040/M9050 Service Manual - Page 394
Defective ADF analog processor PCA., Defective ADF inverter PCA.
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Vertical lines Horizontal lines Stretched/shrunk image Scars on the white calibration strips on Clean the white calibration strips on the back of the the back of the glass. glass. Foreign substances deposited on the Clean the pickup roller. If the problem persists, replace pickup roller. the pickup roller. Foreign substances deposited on the Clean the weight plate. If the problem persists, replace weight plate. the weight plate. Foreign substances deposited on the Clean the feed rollers. If the problem persists, replace feed rollers. the feed rollers. Foreign substances deposited on the Clean the registration roller (upper and lower). If the registration rollers. problem persists, replace the registration rollers. Defective ADF analog processor PCA. Replace the ADF optical assembly. Defective ADF CCD driver. Replace the ADF optical assembly. Defective scanner controller board. Replace scanner controller board. Dirty ADF glass (flip-down). Open the ADF. Release the blue flipdown glass latch (located toward the control panel end of the glass), and clean both sides of the flip-down glass. Scars on the white calibration strips on Clean the white calibration strip on the delivery roller the delivery cover. cover. If the problem persists, replace the delivery roller cover. Defective ADF analog processor PCA. Replace the ADF optical assembly. Defective ADF inverter PCA. Replace the ADF optical assembly. Defective ADF scanning lamp. Replace the ADF optical assembly. Defective ADF CCD driver. Replace the ADF optical assembly. Defective scanner controller board. Replace scanner controller board. Incorrect motor speeds driving the Perform the motor speed calibration, and then the registration rollers and delivery motors. ADF front scaling calibration, and then the ADF back scaling calibration procedures. Skewed image Paper dust or dirt in the feed roller, the registration roller, or the feed guide. Deformed registration roller or feed roller. Clean with water-dampened lint-free cloth. Replace the deformed roller. 376 Chapter 7 Solve problems ENWW