Rap 07: Serial Interface Does Not Receive Data - Oki ML390 Service Manual

RAP 07: Serial Interface Does Not Receive Data

NOTE:
Before performing the procedures of this RAP, make sure that the correct protocols are selected. Print the
Menu to check protocol settings. For information on printing the Menu, refer to Section 4.10 of this Service
Handbook.
START
Is the serial interface cable correctly connected to both the serial interface board and the host computer?
NO Correctly connect the cable.
Is the problem resolved?
YES End of procedure.
NO Go to the next step listed below.
YES Replace the serial interface cable with a cable proven to work. Is the problem resolved?
YES Replace the cable.
NO Perform the Serial Loopback Test. Refer to Section 4.9 of this Service Handbook.
Do the memory buffer and interface tests pass?
NO Replace the serial interface board.
Is the problem resolved?
YES End of procedure.
NO Go to the next step listed below.
YES Check the connection between the serial interface board and the control board. Is the serial interface
board properly inserted into CN3 of the control board?
YES End of procedure.
NO Replace the control board.
Is the problem resolved?
YES End of procedure.
NO Contact Technical Support.
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Service Guide ML390/391
Chapter 4 Failure & Repair Analysis
Page: 93