Lexmark E320 Service Manual - Page 117

4500 Black page Note: Incorrect laser exposure or incorrect charging of the photoconductor causes an all black page. FRU HVPS contacts Engine board LVPS board Controller card HVPS cable HVPS Action Check the contacts for contamination or incorrect installation. Check continuity between solder points on the outside of the HVPS to the contact tips at the print cartridge. With the print cartridge in the printer, check continuity from the solder pads marked "C" (adjacent to fan) to the clip inside the PC shutter. Then check continuity from the left bearing to the right bearing of the charge roll. Replace the contacts or charge roll assembly as necessary. Make sure the cable from the HVPS to the engine or controller card is correctly installed. See "Engine board (E320/E322 only) " on page 5-2 or "Controller (E220/E321/E323 only) " on page 5-7 and check the voltage measurements at J1 or J3 respectively. • If the voltages are correct, check the HVPS to engine/LVPS cable for continuity. • If the cable does not measure continuity, replace the cable. • If the cable measures continuity, replace the HVPS. • If the voltages are not correct, see "Low voltage power supply (LVPS) service check " on page 2-76 and "Engine board service check (E320/E322) " on page 2-72 or "Controller card service check (E220/E321/E323) " on page 2-67. Diagnostic information 2-87