Phaser 4500/4510 Service Manual 3-29Error Messages and CodesLaser Unit FailureDiagnostic Error CodesLaser Fails at warm-up; U2-1 Laser Fail / Power OffLaser Fails Motor Speed; U2-2 Laser Fail/ Power OffLD Power is high; U2-3 Laser Fail/ Power OffLD Power is low; U2-4 Laser Fail/ Power OffTroubleshooting ReferenceApplicable Parts Wiring and Plug/Jack Map References■ Laser unit assembly■ HVPS/engine logic board■ Print cartridge■ Laser unit assembly harness■ LVPS■ “Laser Unit, 5 V Interlock, Interlock SwitchAssembly” on page 10-29■ “Print Cartridge, Transfer Roller Assembly” onpage 10-26■ “P4500: 24 V Interlock, Rear Cover Switch,Main Motor, Sub Fan, Exit Motor Assembly” onpage 10-21■ “Print Engine Wiring Diagrams” on page 10-19■ “Print Engine Plug/Jack Locator” on page 10-3Troubleshooting ProcedureSteps Actions and Questions Yes No1 Enter Service Diagnostics and selectEngine NVRAM Adjustments.Is the laser power setting at thefactory default value of 4?Go to “LaserUnit Assembly”on page 4-12.Go to Step 2.2 Set laser power to default value of 4,and then check again.Does the error still occur?Go to “LaserUnit Assembly”on page 4-12.Problem solved.
