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Service Guide ML590/ML591
Chapter 4 Failure & Repair Analysis
RAP 11 Serial Interface Problem
START.
Are you using a cable with proper number of pins?
No
Change the interface cable.
Has the problem been resolved?
Yes
End of procedure
No
Go to A
Yes
Is the ALARM LED blinking?
Yes
Refer to Section 4.6 of the Service Handbook.
Has the problem been resolved?
Yes
End of procedure
No
Go to A
No
Check the following parameters for the RS232C: baud rate, bit length,
parity, protocol, busy signal and parity.
Has the problem been resolved?
Yes
End of procedure
No
Go to A
A
Check the voltages on the main control board.
Is 10 VAC being supplied to the main control board?
Yes
Replace the RS232C board.
Has the problem been resolved?
Yes
End of procedure.
No
Replace the main control board.
Has the problem been resolved?
