Lexmark Optra C710 Service Manual - Page 130

5016-001 Operator Panel Service Check The printer detects a problem with the operator panel assembly, operator panel cable, interconnect board or controller board, when a POR does not complete and the printer emits 5 beeps. If the operator panel operates properly, except for a PEL or a few PELs missing or broken, run the "LCD Test" on page 3-10, before continuing with this service check. FRU 1 Operator Panel Cable 2 Operator Panel Display Blank, 5 Beeps and LED Off 3 Operator Panel Display Blank, 5 Beeps and LED On 4 Operator Panel all Diamonds and No beeps Action Check for proper installation of the cable at J1 on the interconnect board. • If correctly installed, check the continuity of the cable. • If incorrect, replace the cable. Verify the voltage at J1-2 on the interconnect board measures approximately +5 V dc. • If incorrect, replace the interconnect board. • If correct, replace the operator panel assembly. Verify the connection between J1-4 on the interconnect and ground measures approximately 0 ohms. • If incorrect, replace the interconnect board. • If correct, replace the operator panel assembly. Verify any memory DIMMs and the COS SIMM are not plugged in backward, or improperly installed. Check the controller board for correct installation. • If no problem found, replace the COS SIMM. • If this does not fix the problem, replace the controller board. 2-64 Service Manual