HP 4550 Service Manual - Page 260
Faded print, faded areas, or faded vertical streaks, Full- ghosting, Gray streaks
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No image available Faded print, faded areas, or faded vertical streaks The message TRANSFER KIT LOW REPLACE TRANSFER KIT appears on the printer control panel. Print out a configuration page to verify the remaining life of the transfer belt. Replace the transfer belt if necessary. The moisture content of your media might be uneven or too low. Use media from a different source or from a new ream of paper. If some areas of the paper reject toner, try using paper from a different source or from a new ream of paper. The media might be too rough and exceed media specifications. See Supported media specifications on page 29. Do not use paper that exceeds specifications. Check that the printing environment is within humidity specifications. Faded print could result from low toner in a particular toner cartridge. If a TONER LOW or TONER OUT message appears on the printer control panel, replace the appropriate toner cartridge. Check to see if the transfer belt is contaminated. Use a lint-free cloth to clean any contaminants from the transfer belt surface. The connections into CL2 (ITB unit separation clutch) and CL3 (ITB cleaning roller separation clutch) have been switched at the clutches, not on the PCB. (This typically shows a light black print on the page.) The toner cartridge is getting low on toner. The toner density setting is not adjusted correctly. The internal mirror or optics are contaminated. The laser scanner is damaged. The document scanner needs to be recalibrated. There is a problem in the contact image sensor. There is a problem in the formatter. Full-page ghosting Full-page ghosting occurs when an image prints in full color on one page, but a faded copy of it is also seen on the following page. Make sure that the top spring in the ITB drawer is properly connected. Replace the ITB. Ensure operation of the ITB Cleaning Roller Clutch (CL3). If the imaging drum is near end of life, replace it. If the toner cartridge is near end of life, replace it. Gray streaks The paper does not meet HP paper specifications or is stored improperly. The printer operating environment does not meet specifications. The toner density is set incorrectly. The toner cartridge is defective. There is excess toner inside the printer. Clean the printer. The printer is printing on envelope seams. Move the text to an area away from seams. The imaging drum is defective or at the end of its life. Replace the drum kit. 258 Troubleshooting C7085-90921