Table 40. Image defects (continued) 206 Chapter 7 Troubleshooting C7058-90936 Problem Cause Solution White or missing image No toner is available for print. Remove sealing tape or replace the toner cartridge. Defective laser shutter. Check that the laser shutter operates freely when the toner cartridge is installed. Defectiv Toner ca positione rtridge guide damaged, improperly d, or missing. Make sure the guide is installed properly above the toner cartridge. No trans fer roller voltage. Without transfer roller voltage, toner cannot be attracted from the surface of the drum to the print media.
Perform the half self test functional check to check all other electrophotographic processes. See “Half self test functional check” on page 208. Replace the transfer roller if necessary. No deve Clean the high-voltage power supply contacts. With no developing bias charge, toner is not attracted to the drum. Replace the power supply. 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. Check the drum ground spring and reconnect it, if necessary. Replace the power supply PCB. Defective laser scanner cable assembly.
Low-level signals exchanged between the laser/scanner assembly and the engine controller PCB might be affecting laser output. Replace the laser/scanner cable assembly.