Series 16/18/160/180-Model C Maintenance Manual, GFZ-62755EN ...

B–62755EN/019. TROUBLESHOOTING (SERIAL INTERFACE SPINDLE)AL–13AL–16CPU internal datamemory alarmRAM abnormalityReplace PCB .Item Cause of trouble Check procedure Remedy1External data memory(RAM) defectiveReplace memory (RAM).2 PCB defective Replace PCB.AL–18Program ROMsum check errorItem Cause of trouble Check procedure Remedy1Program memorydata (ROM) defectiveCompare data displayedwhen power is turned ONwith ROM labels.Replace program memory(ROM).AL–19Excessive Uphase currentdetection circuitoffsetItem Cause of trouble Check procedure Remedy123A/D converter defectiveU-phase current detectorcircuit defectiveLoose contact of connectorsbetween PCBand power circuitAfter power is turned on,check if offset voltage oncheck terminal IU is beyondrange of about100 mV.Check connector connectionbetween PCB andpower circuit.Replace A/D converter.Replace PCB.Ensure that PCB and powercircuit are securely connectedwith each other.AL–20Excessive Vphase currentdetection circuitoffsetItem Cause of trouble Check procedure Remedy12V-phase current detectorcircuit defectiveLoose contact of connectorsbetween PCBand power circuitAfter power is turned on,check if offset voltage oncheck terminal IV is beyondrange of about100 mV.Check connector connectionbetween PCB andpower circuit.Replace PCB.Ensure that PCB and powercircuit are securely connectedwith each other.AL–24AL–25Serial transferdata errorSerial datatransfer stoppedItem Cause of trouble Check procedure Remedy123CNC power supply isOFFDefective opticalcable for serial datatransmissionDefective data transmission/receptionelementsin LSI used inserial data transmissionCheck that CNC power isON.Check that optical cable isfitted securely to the connector.Check that thecable is not broken.Check that transmission/reception surfaces of thecable are clean.Turn CNC power ON.Connect securely.Replace optical cable.Clean optical cable transmission/receptionsurfaces.Replace LSI.Replace PCB.395