Lexmark T430 Service Manual - Page 85

4048-1xx Black page Note: Incorrect laser exposure or incorrect charging of the photoconductor by the charge roll causes an all black page. FRU HVPS contacts Controller card assembly HVPS cable HVPS Left guide assembly Action Check the contacts for contamination and correct installation. Replace as necessary. Ensure the HVPS to controller card and charge roll cables are correctly installed. Check continuity of the charge roll cable from C (printed on outside HVPS) to the bushing at the right side of the charge roll. If continuity fails, replace the left guide assembly which includes this cable. Check continuity from the charge roll left side bushing to the right side shaft. If continuity fails, remove the charge roll and clean the left side shaft and bushing. See "High voltage power supply (HVPS)" on page 5-8 and check that the voltage measurements are +24 V dc on socket #4 and +5 V dc on socket #7 on the HVPS. (The pins/ sockets are numbered from left to right when facing the installed HVPS. The front door can be opened to check voltages.) • If incorrect, verify the continuity of the cable. Replace if necessary. Note: Pins 1-8 on the HVPS correspond to pins 4-11 respectively of J19 on the controller card. • If correct, replace the HVPS only after verifying all the above items. Diagnostic information 2-51