Page: 104Service Guide PM3410Chapter 4 Failure & Repair AnalysisRAP 03: Head Homing ErrorSTART.Is +38vdc present on the main logic board? Check at both ends of Capacitor C4.NO Check for an open fuse on the main logic board.Are the cables from CN3 and CN7 on the main logic board correctly connected to the power supply unit?YES Replace the power supply unit.NO Connect them correctly.Is the problem resolved?YES End of procedure.NO Go to the next step listed below.YES Make sure that connector CN1 on the main logic board is correctly installed.Is the problem resolved?YES End of procedure.NO Power OFF the printer and manually move the carriage. Does it move smoothly?YES Replace the main logic 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.NO Is there any paper scrap or dirt on the spacing mechanism?YES Remove the obstruction.NO Remove the ribbon cartridge.Does the carriage move smoothly?YES Replace the ribbon cartridge.NO Replace the ribbon feed assembly.Is the problem resolved?YES End of procedure.NO Replace the space motor.Is the problem resolved?YES End of procedure.
