HP 2300d Service Manual - Page 219

Table 24. Image defects (continued) Problem Cause White or missing image/blank page No toner is available for print. Defective laser shutter. Toner cartridge guide damaged, incorrectly positioned, or missing. No transfer roller voltage. No developing bias. No drum ground path. Defective laser scanner cable assembly. Solution q Remove sealing tape or replace the print cartridge. Look for the REPLACE CARTRIDGE message on the control panel display. q Check that the laser shutter operates freely when the print cartridge is installed. q Make sure the guide is installed correctly above the print cartridge. q 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 228. Replace the transfer roller if necessary. q Clean the high-voltage power supply contacts. With no developing bias charge, toner is not attracted to the drum. q Replace the power supply. q With no ground path, the drum cannot discharge. The negative charge on the drum repels toner, and leaves a white page with bubble print. q Check the drum ground spring and reconnect it, if necessary. q Replace the power supply PCB. q 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. ENWW Chapter 7 Troubleshooting 217