Faded Print/Bubbles (continued) Gray Background 120 Chapter 6 Troubleshooting C4170-90959 Possible Cause Action Transfer Roller is defective or incorrectly installed. If the transfer roller loses conductivity, it cannot effectively pull toner from the drum to the paper. Inspect the Transfer Roller for proper installation and contact. If the Transfer Roller is damaged, replace it. High voltage contact springs are dirty or defective. The high voltage contacts are mounted on the Engine Controller Assembly and protrude into the toner cartridge cavity. Check the contacts for functionality. If damaged, replace the Engine Controller Assembly and the Intermediate PCB.
Engine Controller Assembly is defective. Replace the Engine Controller Assembly and the Intermediate PCB. Possible Cause Action Wrong toner density setting. Adjust the toner density setting in the printer driver. Make sure EconoMode is off. Printing on envelope seams. Printing on an envelope seam can cause a background scatter problem. Move the text to an area without seams. If not printing on seams, try a higher print density setting. See “Media Troubleshooting” (page 129). Paper does not meet printer specifications or is stored improperly. 1. Print a few more pages to see if the problem corrects itself. 2. Turn over the stack of paper in the tray. Also try rotating the paper 180 degrees.
3. Check the paper (or other print media) type and quality. Replace the paper, and advise the customer to use the recommended paper and store it properly. See “Media Specifications” (page 28) Inside of printer is dirty (toner may have leaked out of the toner cartridge). Clean inside of printer (see “Cleaning the Printer” (page 59)). Install a new Toner Cartridge if leaking. Printer’s operating environment does not meet specifications. Make sure the printer’s operating environment meets specifications. See “Operating Environment” (page 26) Faulty Toner Cartridge. Replace the Toner Cartridge. See also “Dark Print” (page 117).