HP 2100 Service Manual - Page 129

Dropouts (continued) Possible Cause Action Paper does not meet Try a different paper lot. See "Media specifications. The Troubleshooting" (page 129). paper moisture content, conductivity, or surface finish may not work correctly with the electrophotographic process. Engine Controller Replace the Engine Controller. defective (low primary voltage or incorrect high voltage). Transfer Roller defective. Replace the Transfer Roller. See also "Blank Spots" (page 114) Hot offset after Let engine cool and retry printing. running narrow or thin media. Faded Print/Bubbles Possible Cause Action No drum ground path. With no ground path the drum cannot discharge. The negative charge on the drum repels toner, and leaves a white page with bubble print. 1. Check the drum ground. See "DC Bias Voltage Contacts Replacement" (page 245) EconoMode is on. EconoMode saves toner by reducing the dot density. This may appear to be a print quality problem in some cases. Turn EconoMode off. Toner supply is low. Shake the cartridge gently to redistribute the toner, or replace the cartridge. Paper does not meet Try a different paper lot. See "Media Specifications" specifications. The (page 28)). moisture content, conductivity, or surface finish may not work correctly with the electrophotographic process. C4170-90959 Image Formation Troubleshooting 119