Lexmark Optra C710 Service Manual - Page 131

5016-001 FRU 5 Operator Panel Assembly Interconnect Board COntroller Board Action Verify the voltages at J1-1 and J1-3 measure approximately +5 V dc. If incorrect, replace the FRUs in the following order: 1. Operator panel assembly interface board 2. Controller board Operator Panel Buttons Service Check Note: Before continuing with this service check, go to the "Button Test" on page 3-10. By running this test, you should be able to isolate a failing button. FRU 1 Operator Panel Assembly 2 Interconnect Board Operator Panel Cable Controller Board (no buttons work) Action If any button fails the Button Test, replace the operator panel assembly. Verify the voltage at J1-5 on the interconnect board measures approximately +5 V dc. • If incorrect, replace the interconnect board. • If correct, check the voltage at pin 5 (white lead) on the operator panel connector. • If incorrect, replace the cable. • If correct, replace the operator panel assembly. If the problem is not located, replace the controller board. Diagnostic Information 2-65