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| Problems Printing or Copying | Possible Cause(s) |
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| The device produces black lines when printing. | Clean the scanner and the document feeder (see also |
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| chapter Cleaning, page 73). |
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| The toner cartridge is damaged and must be replaced. | |
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| Use only original consumable materials. |
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| The device produces vertical lines when printing. | It is possible that the scanner needs calibrating (see also |
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| chapter Calibrating the Scanner, page 73). |
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| The device makes a noise during printing. | The toner cartridge is almost empty and must be re- |
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| placed. Use only original consumable materials. |
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| Received faxes and copies are too light. | The sender’s device is not set optimally. |
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| If the copy is also too light the toner is almost all gone |
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| and must be replaced. Use only original consumable ma- |
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| terials. |
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76 | Philips · LaserMFD 6135hfd |