%RAP 11 Serial Interface ProblemRAP 11 Serial Interface ProblemSTART.Are you using a cable with the proper number of pins?No Change the interface cable.Has the problem been resolved?Yes End of procedureNo Go to AYes Is the ALARM LED blinking?Yes Refer to Section 4.6 of the Service Handbook.Has the problem been resolved?Yes End of procedureNo Go to ANo Go to AACheck the serial interface parameters for the RS232C (in the Printer Menu): baud rate, word length,parity, protocol, busy signal and parity.Has the problem been resolved?Yes End of procedureNo Go to BBCheck 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?Yes End of procedure.No Contact Technical Support.No Replace the power supply unit.Has the problem been resolved?Yes End of procedure.No Replace the RS232C board.Are + 8 vdc / - 8 vdc present on the main control board? (Refer to Appendix A of this ServiceHandbook).Yes Replace the RS232C board.Has the problem been resolved?Yes End of procedure.No Contact Technical Support.No Replace the main control board.Has the problem been resolved?Yes End of procedure.No Contact Technical Support.ML520/521 ( 96-02-04 )
