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Service Guide ML390/391
Chapter 4 Failure & Repair Analysis
RAP 06: Parallel Interface Does Not Receive Data
START
Is the SELECT lamp lit?
NO Press the SELECT button to place the printer in Select Mode. The SELECT lamp will be lit when the
printer is in Select Mode.
Is the problem resolved?
YES End of procedure.
NO Go to the next step listed below.
YES Check the interface cable. Is it correctly connected?
YES Replace the cable with a cable known to work.
Is the problem resolved?
YES End of procedure.
NO Replace the control board.
Is the problem resolved?
YES End of procedure.
NO Call Technical Support.
NO Correctly connect the cable.
Is the problem resolved?
YES End of procedure.
NO Replace the control board.
Is the problem resolved?
YES End of procedure.
NO Call Technical Support.
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