HP Color LaserJet 2840 User Manual
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ProblemCauseSolution More than one sheet feeds at one time.The media tray might be overloaded.Remove some of the media from the tray. See Loading trays. The media might be wrinkled, folded, or damaged.Verify that the media is not wrinkled, folded, or damaged. Try printing on media from a new or different package. Device does not pull media from the media input tray.The device might be in manual feed mode.●If Manual feed appears on the device control-panel display, press E NTER to print the job. ●Verify that the device is not in manual feed mode and print your job again. The pickup roller might be dirty or damaged.Contact HP Customer Care. See Service and support or the support flyer that came in the device box. The paper-length adjustment control in tray 2 (HP Color LaserJet 2840 all-in-one only) is set at a length that is greater than the media size.Adjust the paper-length adjustment control to the correct length. Performance problems Try the tips in this section if pages exit the device, but have nothing printed on them, or when the device does not print any pages. ProblemCauseSolution Pages print but are totally blank.The sealing tape might still be in the print cartridges.Verify that the sealing tape has been completely removed from the print cartridges. The document might contain blank pages.Check the document that you are printing to see if content appears on all of the pages. The device might be malfunctioning.To check the device, print a Configuration page. See Configuration page. Pages print very slowly.Printing in color can slow the print job.If you do not need color for your print job, set the driver to print in grayscale. See Printing in grayscale. Certain media types can slow the print job.Print on a different type of media. ENWWPrint problems245
ProblemCauseSolution Pages did not print.The device might not be pulling media correctly.See Media-handling problems. The media is jamming in the device.Clear the jam. See Clearing jams. The USB cable might be defective or incorrectly connected. ●Disconnect the USB cable at both ends and reconnect it. ●Try printing a job that has printed in the past. ●Try using a different USB cable. Other devices are running on your computer.The device might not share a USB port. If you have an external hard drive or network switchbox that is connected to the same port as the device, the other device might be interfering. To connect and use the device, you must disconnect the other device or you must use two USB ports on the computer. 246Chapter 14 Troubleshooting ENWW
Scan problems This section helps you identify and resolve scanning problems. Solving scanned image problems Use the table below to solve image-scan issues. ProblemCauseSolution The scanned image is of poor quality.The original might be a second- generation photo or picture.●To eliminate the patterns, try reducing the size of the image after scanning. ●Print the scanned image to see if the quality is better. ●Verify that your resolution and color settings are correct for the type of scan job that you are performing. See Scanner resolution and color. ●For best results, use the flatbed scanner for scanning rather than the automatic document feeder (ADF). The image that appears on the screen might not be an accurate representation of the quality of the scan.●Try adjusting your computer monitor settings to use more colors (or levels of gray). Typically, you make this adjustment by opening Display in Windows Control Panel. ●Try adjusting the resolution and color settings in the scanner software. See Scanner resolution and color. The original might have been loaded incorrectly.Use the media guides when you load the originals into the ADF. See To load originals into the automatic document feeder (ADF). The scanner might be dirty.Clean the scanner. See To clean the scanner glass. The graphics settings might not be suitable for the type of scan job that you are performing.Try changing the graphics settings. See Scanner resolution and color. ENWWScan problems247
ProblemCauseSolution Part of the image did not scan.The original might have been loaded incorrectly.Use the media guides when you load the originals into the ADF. See To load originals into the automatic document feeder (ADF). A colored background might be causing images in the foreground to blend into the background.Try adjusting the settings before you scan the original or enhancing the image after you scan the original. See Scanner resolution and color. The original is longer than 381 mm (15 inches).The maximum scannable length is 381 mm (15 inches) when you use the automatic document feeder (ADF) input tray. If the page exceeds the maximum length, the scanner stops. (Copies can be longer.) CAUTION Do not try to pull the original from the ADF; you might damage the scanner or your original. See Media jams occur in the automatic document feeder (ADF). The original is too small.The minimum size that the flatbed scanner supports is 25 by 25 mm (1 by 1 inches). The minimum size that the ADF supports is 127 by 127 mm (5 by 5 inches). The original might be jammed. See Media jams occur in the automatic document feeder (ADF). The media size is incorrect.In Scan settings, make sure that the input media size is large enough for the document that you are scanning. See Scanner resolution and color. 248Chapter 14 Troubleshooting ENWW
ProblemCauseSolution The scan takes too longThe resolution or color level is set too high.Change the resolution and color level settings to the correct settings for your job. See Scanner resolution and color. The software is set to scan in color.The system default is color, which takes longer to scan even when scanning a monochrome original. If you acquire an image through TWAIN or WIA, you can change the settings so that the original scans in grayscale or black-and-white. See the device software Help for details. A print job or copy job was sent before you tried to scan.If someone sent a print job or copy job before you tried to scan, the scan will start if the scanner is not busy. However, because the printer and scanner share memory, the scan might be slower. Scan quality problems This section provides information about improving scan quality by preventing or correcting problems. Preventing problems The following are a few simple steps you can take to improve copy and scan quality. ●Use the flatbed scanner, rather than the automatic document feeder (ADF) input tray, to scan. ●Use high-quality originals. ●Load the media correctly. If the media is loaded incorrectly, it might skew, which causes unclear images. See Loading trays for instructions. ●Adjust the software settings according to how you plan to use the scanned page. See Scanner resolution and color for more information. ●If your device frequently feeds more than one page at a time, the separation pad might need to be replaced. Contact HP Customer Care. See Service and support or the flyer that came in the printer box. ●Use or make a carrier sheet to protect your originals. ENWWScan problems249
Solving scan-quality problems ProblemCauseSolution Blank pagesThe original might have been loaded upside down.In the automatic document feeder (ADF), put the top end of the stack of originals into the ADF input tray, with the media stack face-up and the first page to be scanned on top of the stack. On the flatbed scanner, place the original document face- down with the upper-left corner of the document at the lower- right corner of the glass. Too light or darkThe resolution and color levels may be set incorrectly.Verify that you have the correct resolution and color settings. See Scanner resolution and color. Unwanted linesInk, glue, correction fluid, or an unwanted substance might be on the glass.Clean the flatbed scanner surface. See To clean the scanner glass. The ADF glass might be dirty.Clean the ADF glass. See To clean the scanner glass. Black dots or streaksInk, glue, correction fluid, or an unwanted substance might be on the glass.Clean the flatbed scanner surface. See To clean the scanner glass. Unclear textThe resolution and color levels may be set incorrectly.Verify that you have the correct resolution and color settings. See Scanner resolution and color. 250Chapter 14 Troubleshooting ENWW
Copy problems This section helps you identify and resolve copying problems. Preventing problems The following are a few simple steps you can take to improve copy quality: ●Copy from the flatbed scanner. This will produce a higher quality copy than copying from the automatic document feeder (ADF). ●Use quality originals. ●Load the media correctly. If the media is loaded incorrectly, it might skew, causing unclear images and problems with the OCR application. See Loading documents to scan for instructions. ●Use or make a carrier sheet to protect your originals. Note Verify that the media meets HP specifications. If the media meets HP specifications, recurring feed problems indicate the copier/separation pad is worn. Contact HP Customer Care. See Service and support or the flyer that came in the printer box. Image problems ProblemCauseSolution Images are missing or faded.One or more print cartridges might be low.Replace any low print cartridges. See Changing a print cartridge. The original might be of poor quality.If your original is too light or damaged, the copy might not be able to compensate, even if you adjust the contrast. If possible, find an original document in better condition. The original might have a colored background.Colored backgrounds might cause images in the foreground to blend into the background, or the background might appear in a different shade. If possible, use an original document without a colored background. ENWWCopy problems251
ProblemCauseSolution Vertical white or faded stripes appear on the copy.The media might not meet HP specifications.Use media that meets HP specifications. See Media specifications. One or more print cartridges might be low.Replace any low print cartridges. See Changing a print cartridge. Unwanted lines appear on the copy.Tray 1 might not be placed correctly.Verify that tray 1 is in place. The flatbed scanner or the ADF glass might be dirty.Clean the flatbed scanner or the ADF glass. See To clean the scanner glass. The photosensitive drum inside the print cartridge might have been scratched.Install a new HP print cartridge. See Changing a print cartridge. Black dots or streaks appear on the copy.Ink, glue, correction fluid, or an unwanted substance might be on the automatic document feeder (ADF) or flatbed scanner.Clean the device. See Cleaning the device. Copies are too light or dark.The printer driver or device software settings may be incorrect.Verify that the quality settings are correct. See Adjusting the copy quality. See the device software Help for more information about changing the settings. Text is unclear.The printer driver or device software settings may be incorrect.Verify that the quality settings are correct. See Adjusting the copy quality. See the device software Help for more information about changing the settings. Media-handling problems ProblemCauseSolution Poor print quality or toner adhesionThe paper is too moist, too rough, too heavy or too smooth, or it is embossed or from a faulty paper lot.Try another kind of paper, between 100 and 250 Sheffield, 4 to 6% moisture content. 252Chapter 14 Troubleshooting ENWW
ProblemCauseSolution Dropouts, jamming, or curlThe paper has been stored incorrectly.Store paper flat in its moisture- proof wrapping. The paper has variability from one side to the other.Turn the paper over. Excessive curlThe paper is too moist, has the wrong grain direction, or is of short-grain constructionOpen the rear output bin, or use long-grain paper. The paper varies from side-to- side.Turn the paper over. Jamming, damage to deviceThe paper has cutouts or perforations.Use paper that is free of cutouts or perforations. Problems with feedingThe paper has ragged edges.Use high-quality paper that is made for color laser printers. The paper varies from side-to- side.Turn the paper over. The paper is too moist, too rough, too heavy or too smooth, has the wrong grain direction, or is of short-grain construction or it is embossed or from a faulty paper lot.Try another kind of paper, between 100 and 250 Sheffield, 4 to 6% moisture content. Open the rear output bin, or use long-grain paper. Print is skewed (crooked).The media guides might be incorrectly adjusted.Remove all media from the input tray, straighten the stack, and then load the media in the input tray again. Adjust the media guides to the width and length of the media that you are using and try printing again. More than one sheet feeds at one time.The media tray might be overloaded.Remove some of the media from the tray. See Loading trays. The media might be wrinkled, folded, or damaged.Verify that the media is not wrinkled, folded, or damaged. Try printing on media from a new or different package. ENWWCopy problems253
ProblemCauseSolution Device does not pull media from the media input tray.The device might be in manual feed mode.●If Manual feed appears on the device control-panel display, press E NTER to print the job. ●Verify that the device is not in manual feed mode and print your job again. The pickup roller might be dirty or damaged.Contact HP Customer Care. See Service and support or the support flyer that came in the device box. The paper-length adjustment control in tray 2 (HP Color LaserJet 2840 all-in-one only) is set at a length that is greater than the media size.Adjust the paper-length adjustment control to the correct length. Performance problems ProblemCauseSolution No copy came out.The input tray might be empty.Load media in the device. See Loading documents to scan for more information. The original might have been loaded incorrectly.In the automatic document feeder (ADF), load the original with the narrow side forward and the side to be scanned facing up. On the flatbed scanner, place the original document face- down with the upper-left corner of the document at the lower- right corner of the glass. 254Chapter 14 Troubleshooting ENWW