HP 5100 Service Manual - Page 210
EconoMode, application
UPC - 808736092500
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CAUTION Check the surface of the photosensitive drum in the cartridge to see if it has been damaged or scratched. Touching the drum contaminates the photosensitive surface and can cause spotting and defects during printing. Dark areas on the page might indicate that the drum has been exposed to light for too long. If dark areas appear, stop the printer and wait a few minutes This should eliminate most defective images. If not, placing the toner cartridge in a dark environment for several days can restore some life to the drum. EconoMode EconoMode creates draft-quality printing by reducing the amount of toner on the printed page by up to 50%. Advise the customer to turn EconoMode on or off from the printer driver or software application, because those settings override the control panel settings. EconoMode settings can also be changed from the print-quality menu on the control panel. Hewlett-Packard does not recommend full-time use of EconoMode. If EconoMode is always used, it is likely that the toner supply will outlast the mechanical parts in the toner cartridge. 208 Troubleshooting Q1860-90918