Lexmark C720 Service Manual page 151

5024-001
FRU
2 • Operator Panel
Assembly
• Main Engine (MCTL
P.W.B.) Board
• Control RIP Board
3 • Code SIMM
• Controller RIP Board
4 Operator Panel
Assembly
Action
If the operator panel display is blank, 5
beeps are emitted and the LED is Off.
Replace the operator panel assembly.
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.
If the operator panel has diamonds but
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.
If the operator panel fails any test in the
diagnostic mode, replace the operator
panel.
Diagnostic Information
2-71