Lexmark C720 Service Manual - Page 151
engine MCTL P.W.B. board., Operator Panel
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5024-001 FRU Action 2 • Operator Panel If the operator panel display is blank, 5 Assembly beeps are emitted and the LED is Off. • Main Engine (MCTL P.W.B.) Board Replace the operator panel assembly. • Control RIP Board If the problem still exists, replace the main engine (MCTL P.W.B.) board. If this does not correct the problem, replace the controller RIP board. 3 • Code SIMM If the operator panel has diamonds but • Controller RIP Board does not beep 5 times, check the controller RIP board for proper installation. Verify that the memory DIMMS and the code SIMM are plugged in correctly. If this does not correct the problem, replace the code SIMM. If the problem still exists, replace the controller RIP board. 4 Operator Panel Assembly If the operator panel fails any test in the diagnostic mode, replace the operator panel. Diagnostic Information 2-71
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