Blank Spots Character Voids Class 1: Small sections of characters are missing toner. Class 2: Small sections of thin vertical lines are missing. C4170-90959 Image Formation Troubleshooting 115 Possible Cause Action Empty or defective Toner Cartridge. Replace the Toner Cartridge. See also “Dropouts” (page 118). Possible Cause Action Paper surface too rough. Toner migrates to low spots, leaving higher areas void. User paper with correct finish (smoothness) meeting HP specifications. See “Media Troubleshooting” (page 129). Printing on wrong side of paper. The label on the ream of paper indicates which side to print on.
The different surface properties of some papers may cause problems if loaded wrong side up. Check for the arrow on the paper wrapper. Be sure paper is loaded with the arrow pointing down in the paper trays, or arrow pointing up in Tray 1. If the paper does not have an arrow, try printing on the other side. High moisture in paper. User paper that meets HP specifications. See “Media Troubleshooting” (page 129). Paper surface too smooth for proper toner adhesion. User paper with correct finish (smoothness) meeting HP specifications. See “Media Troubleshooting” (page 129). Bad transparencies. Transparencies can have this problem because they are not designed for proper toner adhesion.
Try another brand of transparency. Bad Transfer Roller. If the Transfer Roller has finger oils on its surface, is dirty or worn out, this problem can result. Clean the Transfer Roller using a dry, lint-free cloth. DO NOT touch the Transfer Roller with bare skin. If the problem persists, replace the Transfer Roller Assembly.