Lexmark E320 Service Manual - Page 105

FRU Fuser lamp Lamp cable LVPS 4500 Action Unplug the printer and disconnect the fuser lamp cable plug from the LVPS board connector CN2. Check for continuity across the fuser lamp pins 1 and 2. If there is continuity, go to Step 1: Continuity. If there is no continuity, go to Step 2: No Continuity. Step 1: Continuity Measure the voltage at connector CN2 on the LVPS. It should match the line voltage. • If line voltage is not present, see "Low voltage power supply (LVPS) service check " on page 2-76 for more information. Make sure the fuser thermistor is correctly connected to the engine board. If the problem persists, disconnect the thermistor cable at J7 (engine board in E320/E322) or J14 (controller card in E220/E321/E323) and check for less than +5 V dc on pin 1. Pin 2 should be ground. See "Engine board (E320/E322 only) " on page 5-2 or page 5-7 for more information. • If the voltage is incorrect, see "Engine board service check (E320/E322) " on page 2-72 or "Controller card service check (E220/E321/E323) " on page 2-67 for more information. Step 2: No Continuity Check the lamp cable for continuity. • If correct, replace the lamp. • If incorrect, replace the lamp cable. Diagnostic information 2-75