Lexmark E350d Service Manual - Page 42

4512-420, -430 LVPS/HVPS service check FRU LVPS/HVPS Action LVPS portion of board Fuses that open typically indicate a faulty LVPS/HVPS. Disconnect the power cable, and open the LVPS/HVPS enough to test the switch. The switch will show continuity across the conductors with a meter when the switch is on. If the switch is good, see "Dead machine service check" on page 2-19 for more diagnostics. HVPS portion of board Problems with the HVPS are exhibited in the print quality. See "Print quality service checks" on page 2-24 for more information. Main motor service check FRU Main gear drive Main motor cable LVPS/HVPS Controller card Warning: Do not replace the operator panel and controller card at the same time. Each card contains the printer settings. When either of these cards is new, it obtains the settings from the other card. Settings are lost when both are new and replaced at the same time. Action Turn off the printer, and unplug the main motor cable at J17. Turn on the printer, and check for the following voltages at J17: J17 pins Pins 1-4 Pin 6 Pins 7-9 Voltages Approx. +3.3 V dc Approx. +5 V dc 10 V dc-24 V dc Verify ground at pin 5 for both the card and cable. • If these voltages are correct, check the main motor cable for continuity. - Remove the left side cover to access the connector on the motor. - If continuity exists on each wire, replace the main gear drive which includes the motor. - If continuity does not exist on one or more of the wires, replace the motor cable. • If these voltages are not correct, see "Controller card connector pin values" on page 5-2, or replace the controller card. See "Controller card removal" on page 4-13. 2-20 Lexmark™ E350d, E352dn