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Service Guide ML320/ML321
Chapter 4 Failure & Repair Analysis
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.
