Lexmark E320 Service Manual - Page 110

4500 FRU Operator panel Controller card Action If none of the lights come on, make sure the cable is properly connected to the controller card. • Check for +5 V dc at J2, pin 5 (E320/E322) or J18, pin 5 (E220/E321/E323). See "RIP controller (E320/E322 only) " on page 5-6 or page 5-7 for more information. • If these voltages are not correct, replace the controller card. • If these voltages are correct, replace the operator panel. If more than one light does not turn on or an individual light stays on solid during POST, replace the operator panel. Verify that the button(s) function correctly. Check continuity between pins 1 and 2 at the operator panel card and cable connector while pressing the button (or Continue E220/E321/E323). Similarly, check continuity between pins 1 and 6 while pressing Cancel (E220/E321/E323). • If continuity is not present, replace the operator panel. If all lights are dim and operate erratically during POST or all lights come on and stay on solid during POST, replace the following field replaceable unit (FRUs) one at a time in the order shown: • Controller card • Operator panel 2-80 Service Manual