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Hint |
| The image defects described in this section are associated with the ADF unit and the scan unit. | ||
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| For more information about image defects and their causes, see the HP LaserJet 4100 series | ||
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| printer service manual. |
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| The MFP output quality is subject to user judgment. This section of the manual helps define | |||
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| The print samples shown in the following figures illustrate some | |||
| future reference, HP suggests that you keep copies of | |||
| field and an explanation of their causes. |
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Hint |
| When troubleshooting image defects, try scanning a test page through the ADF and from the | ||
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| glass to help isolate the cause of the image defect to the ADF unit, scan unit or the print unit. | ||
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| Table 23. Image defects |
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| Problem | Condition | Solution |
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| Distorted images | Improper | ● Adjust the belt tension for the pickup |
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| tension. | motor. See “Optical unit” on page 95. |
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| ● If the problem persists, replace the |
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| belt. See “Optical unit” on page 95. |
Blank page (when | The source document was not | ● Verify that the source document is | ||
using the ADF) | placed in the ADF input tray | |||
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| The source document was not | ● Remove and then reinsert the source |
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| detected in the ADF input tray. | document into the ADF input tray. |
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| ● Verify that the |
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| (PS2) flag freely moves See “ADF |
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| components” on page 56. |
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| ● Use the |
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| to verify that the sensor, ADF motor, |
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| and pickup solenoid are fuctional. See |
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| “Diagnostic tests” on page 126. |
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| A source document was not picked | ● Inspect the ADF pickup and separation |
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| up when attempting to feed multiple | rollers for damage. See “ADF |
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| documents. | components” on page 56. Clean the |
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| rollers if dirty. See “Cleaning the |
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| product” on page 36. |
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Horizontal lines | Dirty glass, whiteboard cover, ADF | ● Clean the glass, whiteboard cover, | ||
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| delivery guide (clear mylar strip). | and/or ADF delivery guide. See |
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| “Cleaning the product” on page 36. |
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| ADF unit and/or scan unit is | ● Calibrate the scan unit. See |
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| improperly calibrated. | “Calibration” on page 47 and/or |
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| “Performing manual calibration” on |
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| page 48. |
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138 Troubleshooting |