Oki ML390 Service Manual page 175

YES Replace the power supply board.
Is the problem resolved?
YES End of procedure.
NO Go to the next step listed below.
NO Reseat the power supply board, the control board, and the connection between the two boards.
Is the problem resolved?
YES End of procedure.
NO Go to E.
E
Is the carriage cable properly inserted into CN2 of the control board?
NO Properly insert the cable.
Is the problem resolved?
YES End of procedure.
NO Go to the next step listed below.
YES Replace the control board.
Is the problem resolved?
YES End of procedure.
NO Replace the space motor.
Is the problem resolved?
YES End of procedure.
NO Contact Technical Support.
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