Lexmark E320 Service Manual - Page 106

4500 Hot fuser service check Make sure the correct voltage lamp is installed. The voltage rating is stamped on one of the lamp contacts. FRU Fuser Action Disconnect the thermistor cable from J7 (engine board in E320/E322) or J14 and J22 (if used) (controller card in E220/E321/E323). Measure the resistance across the thermistor cable. See "Connector locations " on page 5-1 for more information. Replace the fuser assembly if the resistance is lower than 1k ohm or shorted. Note: Resistance measures approximately 240K ohms when cool and 1.4K ohms hot. Low voltage power supply (LVPS) service check FRU Low voltage power supply board (LVPS) Action Set meter for AC line voltage. Check for AC line voltage on CN1 between pins 1, and 3. • If line voltage is present, disconnect the CN3 cable plug from the LVPS board. • If the voltage is not present, replace the power switch or check/ correct missing line voltage. Use the LVPS connector table (page 5-1) and check for correct voltages. If voltage is not present or correct, replace the LVPS fuses and/or the LVPS board. 2-76 Service Manual